1301 lines
57 KiB
Ruby
1301 lines
57 KiB
Ruby
require 'set'
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module ActionView
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module Helpers
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# Prototype[http://www.prototypejs.org/] is a JavaScript library that provides
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# DOM[http://en.wikipedia.org/wiki/Document_Object_Model] manipulation,
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# Ajax[http://www.adaptivepath.com/publications/essays/archives/000385.php]
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# functionality, and more traditional object-oriented facilities for JavaScript.
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# This module provides a set of helpers to make it more convenient to call
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# functions from Prototype using Rails, including functionality to call remote
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# Rails methods (that is, making a background request to a Rails action) using Ajax.
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# This means that you can call actions in your controllers without
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# reloading the page, but still update certain parts of it using
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# injections into the DOM. A common use case is having a form that adds
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# a new element to a list without reloading the page or updating a shopping
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# cart total when a new item is added.
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#
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# == Usage
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# To be able to use these helpers, you must first include the Prototype
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# JavaScript framework in your pages.
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#
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# javascript_include_tag 'prototype'
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#
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# (See the documentation for
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# ActionView::Helpers::JavaScriptHelper for more information on including
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# this and other JavaScript files in your Rails templates.)
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#
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# Now you're ready to call a remote action either through a link...
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#
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# link_to_remote "Add to cart",
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# :url => { :action => "add", :id => product.id },
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# :update => { :success => "cart", :failure => "error" }
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#
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# ...through a form...
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#
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# <% form_remote_tag :url => '/shipping' do -%>
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# <div><%= submit_tag 'Recalculate Shipping' %></div>
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# <% end -%>
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#
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# ...periodically...
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#
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# periodically_call_remote(:url => 'update', :frequency => '5', :update => 'ticker')
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#
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# ...or through an observer (i.e., a form or field that is observed and calls a remote
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# action when changed).
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#
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# <%= observe_field(:searchbox,
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# :url => { :action => :live_search }),
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# :frequency => 0.5,
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# :update => :hits,
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# :with => 'query'
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# %>
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#
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# As you can see, there are numerous ways to use Prototype's Ajax functions (and actually more than
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# are listed here); check out the documentation for each method to find out more about its usage and options.
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#
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# === Common Options
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# See link_to_remote for documentation of options common to all Ajax
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# helpers; any of the options specified by link_to_remote can be used
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# by the other helpers.
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#
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# == Designing your Rails actions for Ajax
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# When building your action handlers (that is, the Rails actions that receive your background requests), it's
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# important to remember a few things. First, whatever your action would normall return to the browser, it will
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# return to the Ajax call. As such, you typically don't want to render with a layout. This call will cause
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# the layout to be transmitted back to your page, and, if you have a full HTML/CSS, will likely mess a lot of things up.
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# You can turn the layout off on particular actions by doing the following:
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#
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# class SiteController < ActionController::Base
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# layout "standard", :except => [:ajax_method, :more_ajax, :another_ajax]
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# end
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#
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# Optionally, you could do this in the method you wish to lack a layout:
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#
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# render :layout => false
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#
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# You can tell the type of request from within your action using the <tt>request.xhr?</tt> (XmlHttpRequest, the
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# method that Ajax uses to make background requests) method.
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# def name
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# # Is this an XmlHttpRequest request?
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# if (request.xhr?)
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# render :text => @name.to_s
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# else
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# # No? Then render an action.
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# render :action => 'view_attribute', :attr => @name
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# end
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# end
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#
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# The else clause can be left off and the current action will render with full layout and template. An extension
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# to this solution was posted to Ryan Heneise's blog at ArtOfMission["http://www.artofmission.com/"].
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#
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# layout proc{ |c| c.request.xhr? ? false : "application" }
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#
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# Dropping this in your ApplicationController turns the layout off for every request that is an "xhr" request.
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#
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# If you are just returning a little data or don't want to build a template for your output, you may opt to simply
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# render text output, like this:
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#
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# render :text => 'Return this from my method!'
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#
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# Since whatever the method returns is injected into the DOM, this will simply inject some text (or HTML, if you
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# tell it to). This is usually how small updates, such updating a cart total or a file count, are handled.
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#
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# == Updating multiple elements
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# See JavaScriptGenerator for information on updating multiple elements
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# on the page in an Ajax response.
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module PrototypeHelper
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unless const_defined? :CALLBACKS
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CALLBACKS = Set.new([ :uninitialized, :loading, :loaded,
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:interactive, :complete, :failure, :success ] +
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(100..599).to_a)
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AJAX_OPTIONS = Set.new([ :before, :after, :condition, :url,
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:asynchronous, :method, :insertion, :position,
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:form, :with, :update, :script ]).merge(CALLBACKS)
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end
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# Returns a link to a remote action defined by <tt>options[:url]</tt>
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# (using the url_for format) that's called in the background using
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# XMLHttpRequest. The result of that request can then be inserted into a
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# DOM object whose id can be specified with <tt>options[:update]</tt>.
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# Usually, the result would be a partial prepared by the controller with
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# render :partial.
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#
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# Examples:
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# # Generates: <a href="#" onclick="new Ajax.Updater('posts', '/blog/destroy/3', {asynchronous:true, evalScripts:true});
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# # return false;">Delete this post</a>
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# link_to_remote "Delete this post", :update => "posts",
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# :url => { :action => "destroy", :id => post.id }
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#
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# # Generates: <a href="#" onclick="new Ajax.Updater('emails', '/mail/list_emails', {asynchronous:true, evalScripts:true});
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# # return false;"><img alt="Refresh" src="/images/refresh.png?" /></a>
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# link_to_remote(image_tag("refresh"), :update => "emails",
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# :url => { :action => "list_emails" })
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#
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# You can override the generated HTML options by specifying a hash in
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# <tt>options[:html]</tt>.
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#
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# link_to_remote "Delete this post", :update => "posts",
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# :url => post_url(@post), :method => :delete,
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# :html => { :class => "destructive" }
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#
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# You can also specify a hash for <tt>options[:update]</tt> to allow for
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# easy redirection of output to an other DOM element if a server-side
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# error occurs:
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#
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# Example:
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# # Generates: <a href="#" onclick="new Ajax.Updater({success:'posts',failure:'error'}, '/blog/destroy/5',
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# # {asynchronous:true, evalScripts:true}); return false;">Delete this post</a>
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# link_to_remote "Delete this post",
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# :url => { :action => "destroy", :id => post.id },
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# :update => { :success => "posts", :failure => "error" }
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#
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# Optionally, you can use the <tt>options[:position]</tt> parameter to
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# influence how the target DOM element is updated. It must be one of
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# <tt>:before</tt>, <tt>:top</tt>, <tt>:bottom</tt>, or <tt>:after</tt>.
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#
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# The method used is by default POST. You can also specify GET or you
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# can simulate PUT or DELETE over POST. All specified with <tt>options[:method]</tt>
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#
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# Example:
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# # Generates: <a href="#" onclick="new Ajax.Request('/person/4', {asynchronous:true, evalScripts:true, method:'delete'});
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# # return false;">Destroy</a>
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# link_to_remote "Destroy", :url => person_url(:id => person), :method => :delete
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#
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# By default, these remote requests are processed asynchronous during
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# which various JavaScript callbacks can be triggered (for progress
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# indicators and the likes). All callbacks get access to the
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# <tt>request</tt> object, which holds the underlying XMLHttpRequest.
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#
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# To access the server response, use <tt>request.responseText</tt>, to
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# find out the HTTP status, use <tt>request.status</tt>.
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#
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# Example:
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# # Generates: <a href="#" onclick="new Ajax.Request('/words/undo?n=33', {asynchronous:true, evalScripts:true,
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# # onComplete:function(request){undoRequestCompleted(request)}}); return false;">hello</a>
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# word = 'hello'
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# link_to_remote word,
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# :url => { :action => "undo", :n => word_counter },
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# :complete => "undoRequestCompleted(request)"
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#
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# The callbacks that may be specified are (in order):
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#
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# <tt>:loading</tt>:: Called when the remote document is being
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# loaded with data by the browser.
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# <tt>:loaded</tt>:: Called when the browser has finished loading
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# the remote document.
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# <tt>:interactive</tt>:: Called when the user can interact with the
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# remote document, even though it has not
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# finished loading.
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# <tt>:success</tt>:: Called when the XMLHttpRequest is completed,
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# and the HTTP status code is in the 2XX range.
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# <tt>:failure</tt>:: Called when the XMLHttpRequest is completed,
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# and the HTTP status code is not in the 2XX
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# range.
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# <tt>:complete</tt>:: Called when the XMLHttpRequest is complete
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# (fires after success/failure if they are
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# present).
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#
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# You can further refine <tt>:success</tt> and <tt>:failure</tt> by
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# adding additional callbacks for specific status codes.
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#
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# Example:
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# # Generates: <a href="#" onclick="new Ajax.Request('/testing/action', {asynchronous:true, evalScripts:true,
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# # on404:function(request){alert('Not found...? Wrong URL...?')},
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# # onFailure:function(request){alert('HTTP Error ' + request.status + '!')}}); return false;">hello</a>
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# link_to_remote word,
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# :url => { :action => "action" },
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# 404 => "alert('Not found...? Wrong URL...?')",
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# :failure => "alert('HTTP Error ' + request.status + '!')"
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#
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# A status code callback overrides the success/failure handlers if
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# present.
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#
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# If you for some reason or another need synchronous processing (that'll
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# block the browser while the request is happening), you can specify
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# <tt>options[:type] = :synchronous</tt>.
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#
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# You can customize further browser side call logic by passing in
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# JavaScript code snippets via some optional parameters. In their order
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# of use these are:
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#
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# <tt>:confirm</tt>:: Adds confirmation dialog.
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# <tt>:condition</tt>:: Perform remote request conditionally
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# by this expression. Use this to
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# describe browser-side conditions when
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# request should not be initiated.
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# <tt>:before</tt>:: Called before request is initiated.
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# <tt>:after</tt>:: Called immediately after request was
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# initiated and before <tt>:loading</tt>.
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# <tt>:submit</tt>:: Specifies the DOM element ID that's used
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# as the parent of the form elements. By
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# default this is the current form, but
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# it could just as well be the ID of a
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# table row or any other DOM element.
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# <tt>:with</tt>:: A JavaScript expression specifying
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# the parameters for the XMLHttpRequest.
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# Any expressions should return a valid
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# URL query string.
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#
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# Example:
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#
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# :with => "'name=' + $('name').value"
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#
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# You can generate a link that uses AJAX in the general case, while
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# degrading gracefully to plain link behavior in the absence of
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# JavaScript by setting <tt>html_options[:href]</tt> to an alternate URL.
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# Note the extra curly braces around the <tt>options</tt> hash separate
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# it as the second parameter from <tt>html_options</tt>, the third.
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#
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# Example:
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# link_to_remote "Delete this post",
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# { :update => "posts", :url => { :action => "destroy", :id => post.id } },
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# :href => url_for(:action => "destroy", :id => post.id)
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def link_to_remote(name, options = {}, html_options = nil)
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link_to_function(name, remote_function(options), html_options || options.delete(:html))
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end
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# Periodically calls the specified url (<tt>options[:url]</tt>) every
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# <tt>options[:frequency]</tt> seconds (default is 10). Usually used to
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# update a specified div (<tt>options[:update]</tt>) with the results
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# of the remote call. The options for specifying the target with <tt>:url</tt>
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# and defining callbacks is the same as link_to_remote.
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# Examples:
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# # Call get_averages and put its results in 'avg' every 10 seconds
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# # Generates:
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# # new PeriodicalExecuter(function() {new Ajax.Updater('avg', '/grades/get_averages',
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# # {asynchronous:true, evalScripts:true})}, 10)
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# periodically_call_remote(:url => { :action => 'get_averages' }, :update => 'avg')
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#
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# # Call invoice every 10 seconds with the id of the customer
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# # If it succeeds, update the invoice DIV; if it fails, update the error DIV
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# # Generates:
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# # new PeriodicalExecuter(function() {new Ajax.Updater({success:'invoice',failure:'error'},
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# # '/testing/invoice/16', {asynchronous:true, evalScripts:true})}, 10)
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# periodically_call_remote(:url => { :action => 'invoice', :id => customer.id },
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# :update => { :success => "invoice", :failure => "error" }
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#
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# # Call update every 20 seconds and update the new_block DIV
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# # Generates:
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# # new PeriodicalExecuter(function() {new Ajax.Updater('news_block', 'update', {asynchronous:true, evalScripts:true})}, 20)
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# periodically_call_remote(:url => 'update', :frequency => '20', :update => 'news_block')
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#
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def periodically_call_remote(options = {})
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frequency = options[:frequency] || 10 # every ten seconds by default
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code = "new PeriodicalExecuter(function() {#{remote_function(options)}}, #{frequency})"
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javascript_tag(code)
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end
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# Returns a form tag that will submit using XMLHttpRequest in the
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# background instead of the regular reloading POST arrangement. Even
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# though it's using JavaScript to serialize the form elements, the form
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# submission will work just like a regular submission as viewed by the
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# receiving side (all elements available in <tt>params</tt>). The options for
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# specifying the target with <tt>:url</tt> and defining callbacks is the same as
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# +link_to_remote+.
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#
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# A "fall-through" target for browsers that doesn't do JavaScript can be
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# specified with the <tt>:action</tt>/<tt>:method</tt> options on <tt>:html</tt>.
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#
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# Example:
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# # Generates:
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# # <form action="/some/place" method="post" onsubmit="new Ajax.Request('',
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# # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)}); return false;">
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# form_remote_tag :html => { :action =>
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# url_for(:controller => "some", :action => "place") }
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#
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# The Hash passed to the <tt>:html</tt> key is equivalent to the options (2nd)
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# argument in the FormTagHelper.form_tag method.
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#
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# By default the fall-through action is the same as the one specified in
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# the <tt>:url</tt> (and the default method is <tt>:post</tt>).
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#
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# form_remote_tag also takes a block, like form_tag:
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# # Generates:
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# # <form action="/" method="post" onsubmit="new Ajax.Request('/',
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# # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)});
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# # return false;"> <div><input name="commit" type="submit" value="Save" /></div>
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# # </form>
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# <% form_remote_tag :url => '/posts' do -%>
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# <div><%= submit_tag 'Save' %></div>
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# <% end -%>
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def form_remote_tag(options = {}, &block)
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options[:form] = true
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options[:html] ||= {}
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options[:html][:onsubmit] =
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(options[:html][:onsubmit] ? options[:html][:onsubmit] + "; " : "") +
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"#{remote_function(options)}; return false;"
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form_tag(options[:html].delete(:action) || url_for(options[:url]), options[:html], &block)
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end
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# Creates a form that will submit using XMLHttpRequest in the background
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# instead of the regular reloading POST arrangement and a scope around a
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# specific resource that is used as a base for questioning about
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# values for the fields.
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#
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# === Resource
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#
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# Example:
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# <% remote_form_for(@post) do |f| %>
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# ...
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# <% end %>
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#
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# This will expand to be the same as:
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#
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# <% remote_form_for :post, @post, :url => post_path(@post), :html => { :method => :put, :class => "edit_post", :id => "edit_post_45" } do |f| %>
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# ...
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# <% end %>
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#
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# === Nested Resource
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#
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# Example:
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# <% remote_form_for([@post, @comment]) do |f| %>
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# ...
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# <% end %>
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#
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# This will expand to be the same as:
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#
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# <% remote_form_for :comment, @comment, :url => post_comment_path(@post, @comment), :html => { :method => :put, :class => "edit_comment", :id => "edit_comment_45" } do |f| %>
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# ...
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# <% end %>
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#
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# If you don't need to attach a form to a resource, then check out form_remote_tag.
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#
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# See FormHelper#form_for for additional semantics.
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def remote_form_for(record_or_name_or_array, *args, &proc)
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options = args.extract_options!
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case record_or_name_or_array
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when String, Symbol
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object_name = record_or_name_or_array
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when Array
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object = record_or_name_or_array.last
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object_name = ActionController::RecordIdentifier.singular_class_name(object)
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apply_form_for_options!(record_or_name_or_array, options)
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args.unshift object
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else
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object = record_or_name_or_array
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object_name = ActionController::RecordIdentifier.singular_class_name(record_or_name_or_array)
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apply_form_for_options!(object, options)
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args.unshift object
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end
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concat(form_remote_tag(options), proc.binding)
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fields_for(object_name, *(args << options), &proc)
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concat('</form>', proc.binding)
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end
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alias_method :form_remote_for, :remote_form_for
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# Returns a button input tag with the element name of +name+ and a value (i.e., display text) of +value+
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# that will submit form using XMLHttpRequest in the background instead of a regular POST request that
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# reloads the page.
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#
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# # Create a button that submits to the create action
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# #
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# # Generates: <input name="create_btn" onclick="new Ajax.Request('/testing/create',
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# # {asynchronous:true, evalScripts:true, parameters:Form.serialize(this.form)});
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# # return false;" type="button" value="Create" />
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# <%= submit_to_remote 'create_btn', 'Create', :url => { :action => 'create' } %>
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#
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# # Submit to the remote action update and update the DIV succeed or fail based
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# # on the success or failure of the request
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# #
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# # Generates: <input name="update_btn" onclick="new Ajax.Updater({success:'succeed',failure:'fail'},
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# # '/testing/update', {asynchronous:true, evalScripts:true, parameters:Form.serialize(this.form)});
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# # return false;" type="button" value="Update" />
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# <%= submit_to_remote 'update_btn', 'Update', :url => { :action => 'update' },
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# :update => { :success => "succeed", :failure => "fail" }
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#
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# <tt>options</tt> argument is the same as in form_remote_tag.
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def submit_to_remote(name, value, options = {})
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options[:with] ||= 'Form.serialize(this.form)'
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options[:html] ||= {}
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options[:html][:type] = 'button'
|
|
options[:html][:onclick] = "#{remote_function(options)}; return false;"
|
|
options[:html][:name] = name
|
|
options[:html][:value] = value
|
|
|
|
tag("input", options[:html], false)
|
|
end
|
|
|
|
# Returns '<tt>eval(request.responseText)</tt>' which is the JavaScript function
|
|
# that +form_remote_tag+ can call in <tt>:complete</tt> to evaluate a multiple
|
|
# update return document using +update_element_function+ calls.
|
|
def evaluate_remote_response
|
|
"eval(request.responseText)"
|
|
end
|
|
|
|
# Returns the JavaScript needed for a remote function.
|
|
# Takes the same arguments as link_to_remote.
|
|
#
|
|
# Example:
|
|
# # Generates: <select id="options" onchange="new Ajax.Updater('options',
|
|
# # '/testing/update_options', {asynchronous:true, evalScripts:true})">
|
|
# <select id="options" onchange="<%= remote_function(:update => "options",
|
|
# :url => { :action => :update_options }) %>">
|
|
# <option value="0">Hello</option>
|
|
# <option value="1">World</option>
|
|
# </select>
|
|
def remote_function(options)
|
|
javascript_options = options_for_ajax(options)
|
|
|
|
update = ''
|
|
if options[:update] && options[:update].is_a?(Hash)
|
|
update = []
|
|
update << "success:'#{options[:update][:success]}'" if options[:update][:success]
|
|
update << "failure:'#{options[:update][:failure]}'" if options[:update][:failure]
|
|
update = '{' + update.join(',') + '}'
|
|
elsif options[:update]
|
|
update << "'#{options[:update]}'"
|
|
end
|
|
|
|
function = update.empty? ?
|
|
"new Ajax.Request(" :
|
|
"new Ajax.Updater(#{update}, "
|
|
|
|
url_options = options[:url]
|
|
url_options = url_options.merge(:escape => false) if url_options.is_a?(Hash)
|
|
function << "'#{escape_javascript(url_for(url_options))}'"
|
|
function << ", #{javascript_options})"
|
|
|
|
function = "#{options[:before]}; #{function}" if options[:before]
|
|
function = "#{function}; #{options[:after]}" if options[:after]
|
|
function = "if (#{options[:condition]}) { #{function}; }" if options[:condition]
|
|
function = "if (confirm('#{escape_javascript(options[:confirm])}')) { #{function}; }" if options[:confirm]
|
|
|
|
return function
|
|
end
|
|
|
|
# Observes the field with the DOM ID specified by +field_id+ and calls a
|
|
# callback when its contents have changed. The default callback is an
|
|
# Ajax call. By default the value of the observed field is sent as a
|
|
# parameter with the Ajax call.
|
|
#
|
|
# Example:
|
|
# # Generates: new Form.Element.Observer('suggest', 0.25, function(element, value) {new Ajax.Updater('suggest',
|
|
# # '/testing/find_suggestion', {asynchronous:true, evalScripts:true, parameters:'q=' + value})})
|
|
# <%= observe_field :suggest, :url => { :action => :find_suggestion },
|
|
# :frequency => 0.25,
|
|
# :update => :suggest,
|
|
# :with => 'q'
|
|
# %>
|
|
#
|
|
# Required +options+ are either of:
|
|
# <tt>:url</tt>:: +url_for+-style options for the action to call
|
|
# when the field has changed.
|
|
# <tt>:function</tt>:: Instead of making a remote call to a URL, you
|
|
# can specify javascript code to be called instead.
|
|
# Note that the value of this option is used as the
|
|
# *body* of the javascript function, a function definition
|
|
# with parameters named element and value will be generated for you
|
|
# for example:
|
|
# observe_field("glass", :frequency => 1, :function => "alert('Element changed')")
|
|
# will generate:
|
|
# new Form.Element.Observer('glass', 1, function(element, value) {alert('Element changed')})
|
|
# The element parameter is the DOM element being observed, and the value is its value at the
|
|
# time the observer is triggered.
|
|
#
|
|
# Additional options are:
|
|
# <tt>:frequency</tt>:: The frequency (in seconds) at which changes to
|
|
# this field will be detected. Not setting this
|
|
# option at all or to a value equal to or less than
|
|
# zero will use event based observation instead of
|
|
# time based observation.
|
|
# <tt>:update</tt>:: Specifies the DOM ID of the element whose
|
|
# innerHTML should be updated with the
|
|
# XMLHttpRequest response text.
|
|
# <tt>:with</tt>:: A JavaScript expression specifying the parameters
|
|
# for the XMLHttpRequest. The default is to send the
|
|
# key and value of the observed field. Any custom
|
|
# expressions should return a valid URL query string.
|
|
# The value of the field is stored in the JavaScript
|
|
# variable +value+.
|
|
#
|
|
# Examples
|
|
#
|
|
# :with => "'my_custom_key=' + value"
|
|
# :with => "'person[name]=' + prompt('New name')"
|
|
# :with => "Form.Element.serialize('other-field')"
|
|
#
|
|
# Finally
|
|
# :with => 'name'
|
|
# is shorthand for
|
|
# :with => "'name=' + value"
|
|
# This essentially just changes the key of the parameter.
|
|
# <tt>:on</tt>:: Specifies which event handler to observe. By default,
|
|
# it's set to "changed" for text fields and areas and
|
|
# "click" for radio buttons and checkboxes. With this,
|
|
# you can specify it instead to be "blur" or "focus" or
|
|
# any other event.
|
|
#
|
|
# Additionally, you may specify any of the options documented in the
|
|
# <em>Common options</em> section at the top of this document.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Sends params: {:title => 'Title of the book'} when the book_title input
|
|
# # field is changed.
|
|
# observe_field 'book_title',
|
|
# :url => 'http://example.com/books/edit/1',
|
|
# :with => 'title'
|
|
#
|
|
# # Sends params: {:book_title => 'Title of the book'} when the focus leaves
|
|
# # the input field.
|
|
# observe_field 'book_title',
|
|
# :url => 'http://example.com/books/edit/1',
|
|
# :on => 'blur'
|
|
#
|
|
def observe_field(field_id, options = {})
|
|
if options[:frequency] && options[:frequency] > 0
|
|
build_observer('Form.Element.Observer', field_id, options)
|
|
else
|
|
build_observer('Form.Element.EventObserver', field_id, options)
|
|
end
|
|
end
|
|
|
|
# Observes the form with the DOM ID specified by +form_id+ and calls a
|
|
# callback when its contents have changed. The default callback is an
|
|
# Ajax call. By default all fields of the observed field are sent as
|
|
# parameters with the Ajax call.
|
|
#
|
|
# The +options+ for +observe_form+ are the same as the options for
|
|
# +observe_field+. The JavaScript variable +value+ available to the
|
|
# <tt>:with</tt> option is set to the serialized form by default.
|
|
def observe_form(form_id, options = {})
|
|
if options[:frequency]
|
|
build_observer('Form.Observer', form_id, options)
|
|
else
|
|
build_observer('Form.EventObserver', form_id, options)
|
|
end
|
|
end
|
|
|
|
# All the methods were moved to GeneratorMethods so that
|
|
# #include_helpers_from_context has nothing to overwrite.
|
|
class JavaScriptGenerator #:nodoc:
|
|
def initialize(context, &block) #:nodoc:
|
|
@context, @lines = context, []
|
|
include_helpers_from_context
|
|
@context.instance_exec(self, &block)
|
|
end
|
|
|
|
private
|
|
def include_helpers_from_context
|
|
@context.extended_by.each do |mod|
|
|
extend mod unless mod.name =~ /^ActionView::Helpers/
|
|
end
|
|
extend GeneratorMethods
|
|
end
|
|
|
|
# JavaScriptGenerator generates blocks of JavaScript code that allow you
|
|
# to change the content and presentation of multiple DOM elements. Use
|
|
# this in your Ajax response bodies, either in a <script> tag or as plain
|
|
# JavaScript sent with a Content-type of "text/javascript".
|
|
#
|
|
# Create new instances with PrototypeHelper#update_page or with
|
|
# ActionController::Base#render, then call +insert_html+, +replace_html+,
|
|
# +remove+, +show+, +hide+, +visual_effect+, or any other of the built-in
|
|
# methods on the yielded generator in any order you like to modify the
|
|
# content and appearance of the current page.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Generates:
|
|
# # new Insertion.Bottom("list", "<li>Some item</li>");
|
|
# # new Effect.Highlight("list");
|
|
# # ["status-indicator", "cancel-link"].each(Element.hide);
|
|
# update_page do |page|
|
|
# page.insert_html :bottom, 'list', "<li>#{@item.name}</li>"
|
|
# page.visual_effect :highlight, 'list'
|
|
# page.hide 'status-indicator', 'cancel-link'
|
|
# end
|
|
#
|
|
#
|
|
# Helper methods can be used in conjunction with JavaScriptGenerator.
|
|
# When a helper method is called inside an update block on the +page+
|
|
# object, that method will also have access to a +page+ object.
|
|
#
|
|
# Example:
|
|
#
|
|
# module ApplicationHelper
|
|
# def update_time
|
|
# page.replace_html 'time', Time.now.to_s(:db)
|
|
# page.visual_effect :highlight, 'time'
|
|
# end
|
|
# end
|
|
#
|
|
# # Controller action
|
|
# def poll
|
|
# render(:update) { |page| page.update_time }
|
|
# end
|
|
#
|
|
# Calls to JavaScriptGenerator not matching a helper method below
|
|
# generate a proxy to the JavaScript Class named by the method called.
|
|
#
|
|
# Examples:
|
|
#
|
|
# # Generates:
|
|
# # Foo.init();
|
|
# update_page do |page|
|
|
# page.foo.init
|
|
# end
|
|
#
|
|
# # Generates:
|
|
# # Event.observe('one', 'click', function () {
|
|
# # $('two').show();
|
|
# # });
|
|
# update_page do |page|
|
|
# page.event.observe('one', 'click') do |p|
|
|
# p[:two].show
|
|
# end
|
|
# end
|
|
#
|
|
# You can also use PrototypeHelper#update_page_tag instead of
|
|
# PrototypeHelper#update_page to wrap the generated JavaScript in a
|
|
# <script> tag.
|
|
module GeneratorMethods
|
|
def to_s #:nodoc:
|
|
returning javascript = @lines * $/ do
|
|
if ActionView::Base.debug_rjs
|
|
source = javascript.dup
|
|
javascript.replace "try {\n#{source}\n} catch (e) "
|
|
javascript << "{ alert('RJS error:\\n\\n' + e.toString()); alert('#{source.gsub('\\','\0\0').gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }}'); throw e }"
|
|
end
|
|
end
|
|
end
|
|
|
|
# Returns a element reference by finding it through +id+ in the DOM. This element can then be
|
|
# used for further method calls. Examples:
|
|
#
|
|
# page['blank_slate'] # => $('blank_slate');
|
|
# page['blank_slate'].show # => $('blank_slate').show();
|
|
# page['blank_slate'].show('first').up # => $('blank_slate').show('first').up();
|
|
#
|
|
# You can also pass in a record, which will use ActionController::RecordIdentifier.dom_id to lookup
|
|
# the correct id:
|
|
#
|
|
# page[@post] # => $('post_45')
|
|
# page[Post.new] # => $('new_post')
|
|
def [](id)
|
|
case id
|
|
when String, Symbol, NilClass
|
|
JavaScriptElementProxy.new(self, id)
|
|
else
|
|
JavaScriptElementProxy.new(self, ActionController::RecordIdentifier.dom_id(id))
|
|
end
|
|
end
|
|
|
|
# Returns an object whose <tt>to_json</tt> evaluates to +code+. Use this to pass a literal JavaScript
|
|
# expression as an argument to another JavaScriptGenerator method.
|
|
def literal(code)
|
|
ActiveSupport::JSON::Variable.new(code.to_s)
|
|
end
|
|
|
|
# Returns a collection reference by finding it through a CSS +pattern+ in the DOM. This collection can then be
|
|
# used for further method calls. Examples:
|
|
#
|
|
# page.select('p') # => $$('p');
|
|
# page.select('p.welcome b').first # => $$('p.welcome b').first();
|
|
# page.select('p.welcome b').first.hide # => $$('p.welcome b').first().hide();
|
|
#
|
|
# You can also use prototype enumerations with the collection. Observe:
|
|
#
|
|
# # Generates: $$('#items li').each(function(value) { value.hide(); });
|
|
# page.select('#items li').each do |value|
|
|
# value.hide
|
|
# end
|
|
#
|
|
# Though you can call the block param anything you want, they are always rendered in the
|
|
# javascript as 'value, index.' Other enumerations, like collect() return the last statement:
|
|
#
|
|
# # Generates: var hidden = $$('#items li').collect(function(value, index) { return value.hide(); });
|
|
# page.select('#items li').collect('hidden') do |item|
|
|
# item.hide
|
|
# end
|
|
#
|
|
def select(pattern)
|
|
JavaScriptElementCollectionProxy.new(self, pattern)
|
|
end
|
|
|
|
# Inserts HTML at the specified +position+ relative to the DOM element
|
|
# identified by the given +id+.
|
|
#
|
|
# +position+ may be one of:
|
|
#
|
|
# <tt>:top</tt>:: HTML is inserted inside the element, before the
|
|
# element's existing content.
|
|
# <tt>:bottom</tt>:: HTML is inserted inside the element, after the
|
|
# element's existing content.
|
|
# <tt>:before</tt>:: HTML is inserted immediately preceding the element.
|
|
# <tt>:after</tt>:: HTML is inserted immediately following the element.
|
|
#
|
|
# +options_for_render+ may be either a string of HTML to insert, or a hash
|
|
# of options to be passed to ActionView::Base#render. For example:
|
|
#
|
|
# # Insert the rendered 'navigation' partial just before the DOM
|
|
# # element with ID 'content'.
|
|
# # Generates: new Insertion.Before("content", "-- Contents of 'navigation' partial --");
|
|
# page.insert_html :before, 'content', :partial => 'navigation'
|
|
#
|
|
# # Add a list item to the bottom of the <ul> with ID 'list'.
|
|
# # Generates: new Insertion.Bottom("list", "<li>Last item</li>");
|
|
# page.insert_html :bottom, 'list', '<li>Last item</li>'
|
|
#
|
|
def insert_html(position, id, *options_for_render)
|
|
insertion = position.to_s.camelize
|
|
call "new Insertion.#{insertion}", id, render(*options_for_render)
|
|
end
|
|
|
|
# Replaces the inner HTML of the DOM element with the given +id+.
|
|
#
|
|
# +options_for_render+ may be either a string of HTML to insert, or a hash
|
|
# of options to be passed to ActionView::Base#render. For example:
|
|
#
|
|
# # Replace the HTML of the DOM element having ID 'person-45' with the
|
|
# # 'person' partial for the appropriate object.
|
|
# # Generates: Element.update("person-45", "-- Contents of 'person' partial --");
|
|
# page.replace_html 'person-45', :partial => 'person', :object => @person
|
|
#
|
|
def replace_html(id, *options_for_render)
|
|
call 'Element.update', id, render(*options_for_render)
|
|
end
|
|
|
|
# Replaces the "outer HTML" (i.e., the entire element, not just its
|
|
# contents) of the DOM element with the given +id+.
|
|
#
|
|
# +options_for_render+ may be either a string of HTML to insert, or a hash
|
|
# of options to be passed to ActionView::Base#render. For example:
|
|
#
|
|
# # Replace the DOM element having ID 'person-45' with the
|
|
# # 'person' partial for the appropriate object.
|
|
# page.replace 'person-45', :partial => 'person', :object => @person
|
|
#
|
|
# This allows the same partial that is used for the +insert_html+ to
|
|
# be also used for the input to +replace+ without resorting to
|
|
# the use of wrapper elements.
|
|
#
|
|
# Examples:
|
|
#
|
|
# <div id="people">
|
|
# <%= render :partial => 'person', :collection => @people %>
|
|
# </div>
|
|
#
|
|
# # Insert a new person
|
|
# #
|
|
# # Generates: new Insertion.Bottom({object: "Matz", partial: "person"}, "");
|
|
# page.insert_html :bottom, :partial => 'person', :object => @person
|
|
#
|
|
# # Replace an existing person
|
|
#
|
|
# # Generates: Element.replace("person_45", "-- Contents of partial --");
|
|
# page.replace 'person_45', :partial => 'person', :object => @person
|
|
#
|
|
def replace(id, *options_for_render)
|
|
call 'Element.replace', id, render(*options_for_render)
|
|
end
|
|
|
|
# Removes the DOM elements with the given +ids+ from the page.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Remove a few people
|
|
# # Generates: ["person_23", "person_9", "person_2"].each(Element.remove);
|
|
# page.remove 'person_23', 'person_9', 'person_2'
|
|
#
|
|
def remove(*ids)
|
|
loop_on_multiple_args 'Element.remove', ids
|
|
end
|
|
|
|
# Shows hidden DOM elements with the given +ids+.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Show a few people
|
|
# # Generates: ["person_6", "person_13", "person_223"].each(Element.show);
|
|
# page.show 'person_6', 'person_13', 'person_223'
|
|
#
|
|
def show(*ids)
|
|
loop_on_multiple_args 'Element.show', ids
|
|
end
|
|
|
|
# Hides the visible DOM elements with the given +ids+.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Hide a few people
|
|
# # Generates: ["person_29", "person_9", "person_0"].each(Element.hide);
|
|
# page.hide 'person_29', 'person_9', 'person_0'
|
|
#
|
|
def hide(*ids)
|
|
loop_on_multiple_args 'Element.hide', ids
|
|
end
|
|
|
|
# Toggles the visibility of the DOM elements with the given +ids+.
|
|
# Example:
|
|
#
|
|
# # Show a few people
|
|
# # Generates: ["person_14", "person_12", "person_23"].each(Element.toggle);
|
|
# page.toggle 'person_14', 'person_12', 'person_23' # Hides the elements
|
|
# page.toggle 'person_14', 'person_12', 'person_23' # Shows the previously hidden elements
|
|
#
|
|
def toggle(*ids)
|
|
loop_on_multiple_args 'Element.toggle', ids
|
|
end
|
|
|
|
# Displays an alert dialog with the given +message+.
|
|
#
|
|
# Example:
|
|
#
|
|
# # Generates: alert('This message is from Rails!')
|
|
# page.alert('This message is from Rails!')
|
|
def alert(message)
|
|
call 'alert', message
|
|
end
|
|
|
|
# Redirects the browser to the given +location+ using JavaScript, in the same form as +url_for+.
|
|
#
|
|
# Examples:
|
|
#
|
|
# # Generates: window.location.href = "/mycontroller";
|
|
# page.redirect_to(:action => 'index')
|
|
#
|
|
# # Generates: window.location.href = "/account/signup";
|
|
# page.redirect_to(:controller => 'account', :action => 'signup')
|
|
def redirect_to(location)
|
|
url = location.is_a?(String) ? location : @context.url_for(location)
|
|
record "window.location.href = #{url.inspect}"
|
|
end
|
|
|
|
# Calls the JavaScript +function+, optionally with the given +arguments+.
|
|
#
|
|
# If a block is given, the block will be passed to a new JavaScriptGenerator;
|
|
# the resulting JavaScript code will then be wrapped inside <tt>function() { ... }</tt>
|
|
# and passed as the called function's final argument.
|
|
#
|
|
# Examples:
|
|
#
|
|
# # Generates: Element.replace(my_element, "My content to replace with.")
|
|
# page.call 'Element.replace', 'my_element', "My content to replace with."
|
|
#
|
|
# # Generates: alert('My message!')
|
|
# page.call 'alert', 'My message!'
|
|
#
|
|
# # Generates:
|
|
# # my_method(function() {
|
|
# # $("one").show();
|
|
# # $("two").hide();
|
|
# # });
|
|
# page.call(:my_method) do |p|
|
|
# p[:one].show
|
|
# p[:two].hide
|
|
# end
|
|
def call(function, *arguments, &block)
|
|
record "#{function}(#{arguments_for_call(arguments, block)})"
|
|
end
|
|
|
|
# Assigns the JavaScript +variable+ the given +value+.
|
|
#
|
|
# Examples:
|
|
#
|
|
# # Generates: my_string = "This is mine!";
|
|
# page.assign 'my_string', 'This is mine!'
|
|
#
|
|
# # Generates: record_count = 33;
|
|
# page.assign 'record_count', 33
|
|
#
|
|
# # Generates: tabulated_total = 47
|
|
# page.assign 'tabulated_total', @total_from_cart
|
|
#
|
|
def assign(variable, value)
|
|
record "#{variable} = #{javascript_object_for(value)}"
|
|
end
|
|
|
|
# Writes raw JavaScript to the page.
|
|
#
|
|
# Example:
|
|
#
|
|
# page << "alert('JavaScript with Prototype.');"
|
|
def <<(javascript)
|
|
@lines << javascript
|
|
end
|
|
|
|
# Executes the content of the block after a delay of +seconds+. Example:
|
|
#
|
|
# # Generates:
|
|
# # setTimeout(function() {
|
|
# # ;
|
|
# # new Effect.Fade("notice",{});
|
|
# # }, 20000);
|
|
# page.delay(20) do
|
|
# page.visual_effect :fade, 'notice'
|
|
# end
|
|
def delay(seconds = 1)
|
|
record "setTimeout(function() {\n\n"
|
|
yield
|
|
record "}, #{(seconds * 1000).to_i})"
|
|
end
|
|
|
|
# Starts a script.aculo.us visual effect. See
|
|
# ActionView::Helpers::ScriptaculousHelper for more information.
|
|
def visual_effect(name, id = nil, options = {})
|
|
record @context.send(:visual_effect, name, id, options)
|
|
end
|
|
|
|
# Creates a script.aculo.us sortable element. Useful
|
|
# to recreate sortable elements after items get added
|
|
# or deleted.
|
|
# See ActionView::Helpers::ScriptaculousHelper for more information.
|
|
def sortable(id, options = {})
|
|
record @context.send(:sortable_element_js, id, options)
|
|
end
|
|
|
|
# Creates a script.aculo.us draggable element.
|
|
# See ActionView::Helpers::ScriptaculousHelper for more information.
|
|
def draggable(id, options = {})
|
|
record @context.send(:draggable_element_js, id, options)
|
|
end
|
|
|
|
# Creates a script.aculo.us drop receiving element.
|
|
# See ActionView::Helpers::ScriptaculousHelper for more information.
|
|
def drop_receiving(id, options = {})
|
|
record @context.send(:drop_receiving_element_js, id, options)
|
|
end
|
|
|
|
private
|
|
def loop_on_multiple_args(method, ids)
|
|
record(ids.size>1 ?
|
|
"#{javascript_object_for(ids)}.each(#{method})" :
|
|
"#{method}(#{ids.first.to_json})")
|
|
end
|
|
|
|
def page
|
|
self
|
|
end
|
|
|
|
def record(line)
|
|
returning line = "#{line.to_s.chomp.gsub(/\;\z/, '')};" do
|
|
self << line
|
|
end
|
|
end
|
|
|
|
def render(*options_for_render)
|
|
old_format = @context && @context.template_format
|
|
@context.template_format = :html if @context
|
|
Hash === options_for_render.first ?
|
|
@context.render(*options_for_render) :
|
|
options_for_render.first.to_s
|
|
ensure
|
|
@context.template_format = old_format if @context
|
|
end
|
|
|
|
def javascript_object_for(object)
|
|
object.respond_to?(:to_json) ? object.to_json : object.inspect
|
|
end
|
|
|
|
def arguments_for_call(arguments, block = nil)
|
|
arguments << block_to_function(block) if block
|
|
arguments.map { |argument| javascript_object_for(argument) }.join ', '
|
|
end
|
|
|
|
def block_to_function(block)
|
|
generator = self.class.new(@context, &block)
|
|
literal("function() { #{generator.to_s} }")
|
|
end
|
|
|
|
def method_missing(method, *arguments)
|
|
JavaScriptProxy.new(self, method.to_s.camelize)
|
|
end
|
|
end
|
|
end
|
|
|
|
# Yields a JavaScriptGenerator and returns the generated JavaScript code.
|
|
# Use this to update multiple elements on a page in an Ajax response.
|
|
# See JavaScriptGenerator for more information.
|
|
#
|
|
# Example:
|
|
#
|
|
# update_page do |page|
|
|
# page.hide 'spinner'
|
|
# end
|
|
def update_page(&block)
|
|
JavaScriptGenerator.new(@template, &block).to_s
|
|
end
|
|
|
|
# Works like update_page but wraps the generated JavaScript in a <script>
|
|
# tag. Use this to include generated JavaScript in an ERb template.
|
|
# See JavaScriptGenerator for more information.
|
|
#
|
|
# +html_options+ may be a hash of <script> attributes to be passed
|
|
# to ActionView::Helpers::JavaScriptHelper#javascript_tag.
|
|
def update_page_tag(html_options = {}, &block)
|
|
javascript_tag update_page(&block), html_options
|
|
end
|
|
|
|
protected
|
|
def options_for_ajax(options)
|
|
js_options = build_callbacks(options)
|
|
|
|
js_options['asynchronous'] = options[:type] != :synchronous
|
|
js_options['method'] = method_option_to_s(options[:method]) if options[:method]
|
|
js_options['insertion'] = "Insertion.#{options[:position].to_s.camelize}" if options[:position]
|
|
js_options['evalScripts'] = options[:script].nil? || options[:script]
|
|
|
|
if options[:form]
|
|
js_options['parameters'] = 'Form.serialize(this)'
|
|
elsif options[:submit]
|
|
js_options['parameters'] = "Form.serialize('#{options[:submit]}')"
|
|
elsif options[:with]
|
|
js_options['parameters'] = options[:with]
|
|
end
|
|
|
|
if protect_against_forgery? && !options[:form]
|
|
if js_options['parameters']
|
|
js_options['parameters'] << " + '&"
|
|
else
|
|
js_options['parameters'] = "'"
|
|
end
|
|
js_options['parameters'] << "#{request_forgery_protection_token}=' + encodeURIComponent('#{escape_javascript form_authenticity_token}')"
|
|
end
|
|
|
|
options_for_javascript(js_options)
|
|
end
|
|
|
|
def method_option_to_s(method)
|
|
(method.is_a?(String) and !method.index("'").nil?) ? method : "'#{method}'"
|
|
end
|
|
|
|
def build_observer(klass, name, options = {})
|
|
if options[:with] && (options[:with] !~ /[\{=(.]/)
|
|
options[:with] = "'#{options[:with]}=' + encodeURIComponent(value)"
|
|
else
|
|
options[:with] ||= 'value' unless options[:function]
|
|
end
|
|
|
|
callback = options[:function] || remote_function(options)
|
|
javascript = "new #{klass}('#{name}', "
|
|
javascript << "#{options[:frequency]}, " if options[:frequency]
|
|
javascript << "function(element, value) {"
|
|
javascript << "#{callback}}"
|
|
javascript << ", '#{options[:on]}'" if options[:on]
|
|
javascript << ")"
|
|
javascript_tag(javascript)
|
|
end
|
|
|
|
def build_callbacks(options)
|
|
callbacks = {}
|
|
options.each do |callback, code|
|
|
if CALLBACKS.include?(callback)
|
|
name = 'on' + callback.to_s.capitalize
|
|
callbacks[name] = "function(request){#{code}}"
|
|
end
|
|
end
|
|
callbacks
|
|
end
|
|
end
|
|
|
|
# Converts chained method calls on DOM proxy elements into JavaScript chains
|
|
class JavaScriptProxy < ActiveSupport::BasicObject #:nodoc:
|
|
|
|
def initialize(generator, root = nil)
|
|
@generator = generator
|
|
@generator << root if root
|
|
end
|
|
|
|
private
|
|
def method_missing(method, *arguments, &block)
|
|
if method.to_s =~ /(.*)=$/
|
|
assign($1, arguments.first)
|
|
else
|
|
call("#{method.to_s.camelize(:lower)}", *arguments, &block)
|
|
end
|
|
end
|
|
|
|
def call(function, *arguments, &block)
|
|
append_to_function_chain!("#{function}(#{@generator.send(:arguments_for_call, arguments, block)})")
|
|
self
|
|
end
|
|
|
|
def assign(variable, value)
|
|
append_to_function_chain!("#{variable} = #{@generator.send(:javascript_object_for, value)}")
|
|
end
|
|
|
|
def function_chain
|
|
@function_chain ||= @generator.instance_variable_get(:@lines)
|
|
end
|
|
|
|
def append_to_function_chain!(call)
|
|
function_chain[-1].chomp!(';')
|
|
function_chain[-1] += ".#{call};"
|
|
end
|
|
end
|
|
|
|
class JavaScriptElementProxy < JavaScriptProxy #:nodoc:
|
|
def initialize(generator, id)
|
|
@id = id
|
|
super(generator, "$(#{id.to_json})")
|
|
end
|
|
|
|
# Allows access of element attributes through +attribute+. Examples:
|
|
#
|
|
# page['foo']['style'] # => $('foo').style;
|
|
# page['foo']['style']['color'] # => $('blank_slate').style.color;
|
|
# page['foo']['style']['color'] = 'red' # => $('blank_slate').style.color = 'red';
|
|
# page['foo']['style'].color = 'red' # => $('blank_slate').style.color = 'red';
|
|
def [](attribute)
|
|
append_to_function_chain!(attribute)
|
|
self
|
|
end
|
|
|
|
def []=(variable, value)
|
|
assign(variable, value)
|
|
end
|
|
|
|
def replace_html(*options_for_render)
|
|
call 'update', @generator.send(:render, *options_for_render)
|
|
end
|
|
|
|
def replace(*options_for_render)
|
|
call 'replace', @generator.send(:render, *options_for_render)
|
|
end
|
|
|
|
def reload(options_for_replace = {})
|
|
replace(options_for_replace.merge({ :partial => @id.to_s }))
|
|
end
|
|
|
|
end
|
|
|
|
class JavaScriptVariableProxy < JavaScriptProxy #:nodoc:
|
|
def initialize(generator, variable)
|
|
@variable = variable
|
|
@empty = true # only record lines if we have to. gets rid of unnecessary linebreaks
|
|
super(generator)
|
|
end
|
|
|
|
# The JSON Encoder calls this to check for the +to_json+ method
|
|
# Since it's a blank slate object, I suppose it responds to anything.
|
|
def respond_to?(method)
|
|
true
|
|
end
|
|
|
|
def to_json(options = nil)
|
|
@variable
|
|
end
|
|
|
|
private
|
|
def append_to_function_chain!(call)
|
|
@generator << @variable if @empty
|
|
@empty = false
|
|
super
|
|
end
|
|
end
|
|
|
|
class JavaScriptCollectionProxy < JavaScriptProxy #:nodoc:
|
|
ENUMERABLE_METHODS_WITH_RETURN = [:all, :any, :collect, :map, :detect, :find, :find_all, :select, :max, :min, :partition, :reject, :sort_by, :in_groups_of, :each_slice] unless defined? ENUMERABLE_METHODS_WITH_RETURN
|
|
ENUMERABLE_METHODS = ENUMERABLE_METHODS_WITH_RETURN + [:each] unless defined? ENUMERABLE_METHODS
|
|
attr_reader :generator
|
|
delegate :arguments_for_call, :to => :generator
|
|
|
|
def initialize(generator, pattern)
|
|
super(generator, @pattern = pattern)
|
|
end
|
|
|
|
def each_slice(variable, number, &block)
|
|
if block
|
|
enumerate :eachSlice, :variable => variable, :method_args => [number], :yield_args => %w(value index), :return => true, &block
|
|
else
|
|
add_variable_assignment!(variable)
|
|
append_enumerable_function!("eachSlice(#{number.to_json});")
|
|
end
|
|
end
|
|
|
|
def grep(variable, pattern, &block)
|
|
enumerate :grep, :variable => variable, :return => true, :method_args => [pattern], :yield_args => %w(value index), &block
|
|
end
|
|
|
|
def in_groups_of(variable, number, fill_with = nil)
|
|
arguments = [number]
|
|
arguments << fill_with unless fill_with.nil?
|
|
add_variable_assignment!(variable)
|
|
append_enumerable_function!("inGroupsOf(#{arguments_for_call arguments});")
|
|
end
|
|
|
|
def inject(variable, memo, &block)
|
|
enumerate :inject, :variable => variable, :method_args => [memo], :yield_args => %w(memo value index), :return => true, &block
|
|
end
|
|
|
|
def pluck(variable, property)
|
|
add_variable_assignment!(variable)
|
|
append_enumerable_function!("pluck(#{property.to_json});")
|
|
end
|
|
|
|
def zip(variable, *arguments, &block)
|
|
add_variable_assignment!(variable)
|
|
append_enumerable_function!("zip(#{arguments_for_call arguments}")
|
|
if block
|
|
function_chain[-1] += ", function(array) {"
|
|
yield ::ActiveSupport::JSON::Variable.new('array')
|
|
add_return_statement!
|
|
@generator << '});'
|
|
else
|
|
function_chain[-1] += ');'
|
|
end
|
|
end
|
|
|
|
private
|
|
def method_missing(method, *arguments, &block)
|
|
if ENUMERABLE_METHODS.include?(method)
|
|
returnable = ENUMERABLE_METHODS_WITH_RETURN.include?(method)
|
|
variable = arguments.first if returnable
|
|
enumerate(method, {:variable => (arguments.first if returnable), :return => returnable, :yield_args => %w(value index)}, &block)
|
|
else
|
|
super
|
|
end
|
|
end
|
|
|
|
# Options
|
|
# * variable - name of the variable to set the result of the enumeration to
|
|
# * method_args - array of the javascript enumeration method args that occur before the function
|
|
# * yield_args - array of the javascript yield args
|
|
# * return - true if the enumeration should return the last statement
|
|
def enumerate(enumerable, options = {}, &block)
|
|
options[:method_args] ||= []
|
|
options[:yield_args] ||= []
|
|
yield_args = options[:yield_args] * ', '
|
|
method_args = arguments_for_call options[:method_args] # foo, bar, function
|
|
method_args << ', ' unless method_args.blank?
|
|
add_variable_assignment!(options[:variable]) if options[:variable]
|
|
append_enumerable_function!("#{enumerable.to_s.camelize(:lower)}(#{method_args}function(#{yield_args}) {")
|
|
# only yield as many params as were passed in the block
|
|
yield(*options[:yield_args].collect { |p| JavaScriptVariableProxy.new(@generator, p) }[0..block.arity-1])
|
|
add_return_statement! if options[:return]
|
|
@generator << '});'
|
|
end
|
|
|
|
def add_variable_assignment!(variable)
|
|
function_chain.push("var #{variable} = #{function_chain.pop}")
|
|
end
|
|
|
|
def add_return_statement!
|
|
unless function_chain.last =~ /return/
|
|
function_chain.push("return #{function_chain.pop.chomp(';')};")
|
|
end
|
|
end
|
|
|
|
def append_enumerable_function!(call)
|
|
function_chain[-1].chomp!(';')
|
|
function_chain[-1] += ".#{call}"
|
|
end
|
|
end
|
|
|
|
class JavaScriptElementCollectionProxy < JavaScriptCollectionProxy #:nodoc:\
|
|
def initialize(generator, pattern)
|
|
super(generator, "$$(#{pattern.to_json})")
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
require 'action_view/helpers/javascript_helper'
|