2007-01-22 14:43:50 +01:00
|
|
|
require 'set'
|
|
|
|
|
|
|
|
module ActionView
|
|
|
|
module Helpers
|
|
|
|
# Provides a set of helpers for calling Prototype JavaScript functions,
|
|
|
|
# including functionality to call remote methods using
|
|
|
|
# Ajax[http://www.adaptivepath.com/publications/essays/archives/000385.php].
|
|
|
|
# This means that you can call actions in your controllers without
|
|
|
|
# reloading the page, but still update certain parts of it using
|
|
|
|
# injections into the DOM. The common use case is having a form that adds
|
|
|
|
# a new element to a list without reloading the page.
|
|
|
|
#
|
|
|
|
# To be able to use these helpers, you must include the Prototype
|
|
|
|
# JavaScript framework in your pages. See the documentation for
|
|
|
|
# ActionView::Helpers::JavaScriptHelper for more information on including
|
|
|
|
# the necessary JavaScript.
|
|
|
|
#
|
|
|
|
# See link_to_remote for documentation of options common to all Ajax
|
|
|
|
# helpers.
|
|
|
|
#
|
|
|
|
# See also ActionView::Helpers::ScriptaculousHelper for helpers which work
|
|
|
|
# with the Scriptaculous controls and visual effects library.
|
|
|
|
#
|
|
|
|
# See JavaScriptGenerator for information on updating multiple elements
|
|
|
|
# on the page in an Ajax response.
|
|
|
|
module PrototypeHelper
|
|
|
|
unless const_defined? :CALLBACKS
|
|
|
|
CALLBACKS = Set.new([ :uninitialized, :loading, :loaded,
|
|
|
|
:interactive, :complete, :failure, :success ] +
|
|
|
|
(100..599).to_a)
|
|
|
|
AJAX_OPTIONS = Set.new([ :before, :after, :condition, :url,
|
|
|
|
:asynchronous, :method, :insertion, :position,
|
|
|
|
:form, :with, :update, :script ]).merge(CALLBACKS)
|
|
|
|
end
|
|
|
|
|
|
|
|
# Returns a link to a remote action defined by <tt>options[:url]</tt>
|
|
|
|
# (using the url_for format) that's called in the background using
|
|
|
|
# XMLHttpRequest. The result of that request can then be inserted into a
|
|
|
|
# DOM object whose id can be specified with <tt>options[:update]</tt>.
|
|
|
|
# Usually, the result would be a partial prepared by the controller with
|
2007-02-09 09:04:31 +01:00
|
|
|
# render :partial.
|
2007-01-22 14:43:50 +01:00
|
|
|
#
|
|
|
|
# Examples:
|
|
|
|
# link_to_remote "Delete this post", :update => "posts",
|
|
|
|
# :url => { :action => "destroy", :id => post.id }
|
|
|
|
# link_to_remote(image_tag("refresh"), :update => "emails",
|
|
|
|
# :url => { :action => "list_emails" })
|
|
|
|
#
|
|
|
|
# You can also specify a hash for <tt>options[:update]</tt> to allow for
|
|
|
|
# easy redirection of output to an other DOM element if a server-side
|
|
|
|
# error occurs:
|
|
|
|
#
|
|
|
|
# Example:
|
|
|
|
# link_to_remote "Delete this post",
|
|
|
|
# :url => { :action => "destroy", :id => post.id },
|
|
|
|
# :update => { :success => "posts", :failure => "error" }
|
|
|
|
#
|
|
|
|
# Optionally, you can use the <tt>options[:position]</tt> parameter to
|
|
|
|
# influence how the target DOM element is updated. It must be one of
|
|
|
|
# <tt>:before</tt>, <tt>:top</tt>, <tt>:bottom</tt>, or <tt>:after</tt>.
|
|
|
|
#
|
2007-02-09 09:04:31 +01:00
|
|
|
# The method used is by default POST. You can also specify GET or you
|
|
|
|
# can simulate PUT or DELETE over POST. All specified with <tt>options[:method]</tt>
|
|
|
|
#
|
|
|
|
# Example:
|
|
|
|
# link_to_remote "Destroy", :url => person_url(:id => person), :method => :delete
|
|
|
|
#
|
2007-01-22 14:43:50 +01:00
|
|
|
# By default, these remote requests are processed asynchronous during
|
|
|
|
# which various JavaScript callbacks can be triggered (for progress
|
|
|
|
# indicators and the likes). All callbacks get access to the
|
|
|
|
# <tt>request</tt> object, which holds the underlying XMLHttpRequest.
|
|
|
|
#
|
|
|
|
# To access the server response, use <tt>request.responseText</tt>, to
|
|
|
|
# find out the HTTP status, use <tt>request.status</tt>.
|
|
|
|
#
|
|
|
|
# Example:
|
|
|
|
# link_to_remote word,
|
|
|
|
# :url => { :action => "undo", :n => word_counter },
|
|
|
|
# :complete => "undoRequestCompleted(request)"
|
|
|
|
#
|
|
|
|
# The callbacks that may be specified are (in order):
|
|
|
|
#
|
|
|
|
# <tt>:loading</tt>:: Called when the remote document is being
|
|
|
|
# loaded with data by the browser.
|
|
|
|
# <tt>:loaded</tt>:: Called when the browser has finished loading
|
|
|
|
# the remote document.
|
|
|
|
# <tt>:interactive</tt>:: Called when the user can interact with the
|
|
|
|
# remote document, even though it has not
|
|
|
|
# finished loading.
|
|
|
|
# <tt>:success</tt>:: Called when the XMLHttpRequest is completed,
|
|
|
|
# and the HTTP status code is in the 2XX range.
|
|
|
|
# <tt>:failure</tt>:: Called when the XMLHttpRequest is completed,
|
|
|
|
# and the HTTP status code is not in the 2XX
|
|
|
|
# range.
|
|
|
|
# <tt>:complete</tt>:: Called when the XMLHttpRequest is complete
|
|
|
|
# (fires after success/failure if they are
|
|
|
|
# present).
|
|
|
|
#
|
|
|
|
# You can further refine <tt>:success</tt> and <tt>:failure</tt> by
|
|
|
|
# adding additional callbacks for specific status codes.
|
|
|
|
#
|
|
|
|
# Example:
|
|
|
|
# link_to_remote word,
|
|
|
|
# :url => { :action => "action" },
|
|
|
|
# 404 => "alert('Not found...? Wrong URL...?')",
|
|
|
|
# :failure => "alert('HTTP Error ' + request.status + '!')"
|
|
|
|
#
|
|
|
|
# A status code callback overrides the success/failure handlers if
|
|
|
|
# present.
|
|
|
|
#
|
|
|
|
# If you for some reason or another need synchronous processing (that'll
|
|
|
|
# block the browser while the request is happening), you can specify
|
|
|
|
# <tt>options[:type] = :synchronous</tt>.
|
|
|
|
#
|
|
|
|
# You can customize further browser side call logic by passing in
|
|
|
|
# JavaScript code snippets via some optional parameters. In their order
|
|
|
|
# of use these are:
|
|
|
|
#
|
|
|
|
# <tt>:confirm</tt>:: Adds confirmation dialog.
|
|
|
|
# <tt>:condition</tt>:: Perform remote request conditionally
|
|
|
|
# by this expression. Use this to
|
|
|
|
# describe browser-side conditions when
|
|
|
|
# request should not be initiated.
|
|
|
|
# <tt>:before</tt>:: Called before request is initiated.
|
|
|
|
# <tt>:after</tt>:: Called immediately after request was
|
|
|
|
# initiated and before <tt>:loading</tt>.
|
|
|
|
# <tt>:submit</tt>:: Specifies the DOM element ID that's used
|
|
|
|
# as the parent of the form elements. By
|
|
|
|
# default this is the current form, but
|
|
|
|
# it could just as well be the ID of a
|
|
|
|
# table row or any other DOM element.
|
|
|
|
def link_to_remote(name, options = {}, html_options = {})
|
|
|
|
link_to_function(name, remote_function(options), html_options)
|
|
|
|
end
|
|
|
|
|
|
|
|
# Periodically calls the specified url (<tt>options[:url]</tt>) every
|
|
|
|
# <tt>options[:frequency]</tt> seconds (default is 10). Usually used to
|
|
|
|
# update a specified div (<tt>options[:update]</tt>) with the results
|
|
|
|
# of the remote call. The options for specifying the target with :url
|
|
|
|
# and defining callbacks is the same as link_to_remote.
|
|
|
|
def periodically_call_remote(options = {})
|
|
|
|
frequency = options[:frequency] || 10 # every ten seconds by default
|
|
|
|
code = "new PeriodicalExecuter(function() {#{remote_function(options)}}, #{frequency})"
|
|
|
|
javascript_tag(code)
|
|
|
|
end
|
|
|
|
|
|
|
|
# Returns a form tag that will submit using XMLHttpRequest in the
|
|
|
|
# background instead of the regular reloading POST arrangement. Even
|
|
|
|
# though it's using JavaScript to serialize the form elements, the form
|
|
|
|
# submission will work just like a regular submission as viewed by the
|
|
|
|
# receiving side (all elements available in <tt>params</tt>). The options for
|
|
|
|
# specifying the target with :url and defining callbacks is the same as
|
|
|
|
# link_to_remote.
|
|
|
|
#
|
|
|
|
# A "fall-through" target for browsers that doesn't do JavaScript can be
|
|
|
|
# specified with the :action/:method options on :html.
|
|
|
|
#
|
|
|
|
# Example:
|
|
|
|
# form_remote_tag :html => { :action =>
|
|
|
|
# url_for(:controller => "some", :action => "place") }
|
|
|
|
#
|
|
|
|
# The Hash passed to the :html key is equivalent to the options (2nd)
|
|
|
|
# argument in the FormTagHelper.form_tag method.
|
|
|
|
#
|
|
|
|
# By default the fall-through action is the same as the one specified in
|
|
|
|
# the :url (and the default method is :post).
|
2007-02-09 09:04:31 +01:00
|
|
|
#
|
|
|
|
# form_remote_tag also takes a block, like form_tag:
|
|
|
|
# <% form_remote_tag :url => '/posts' do -%>
|
|
|
|
# <div><%= submit_tag 'Save' %></div>
|
|
|
|
# <% end -%>
|
|
|
|
def form_remote_tag(options = {}, &block)
|
2007-01-22 14:43:50 +01:00
|
|
|
options[:form] = true
|
|
|
|
|
|
|
|
options[:html] ||= {}
|
2007-02-09 09:04:31 +01:00
|
|
|
options[:html][:onsubmit] =
|
|
|
|
(options[:html][:onsubmit] ? options[:html][:onsubmit] + "; " : "") +
|
|
|
|
"#{remote_function(options)}; return false;"
|
2007-01-22 14:43:50 +01:00
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
form_tag(options[:html].delete(:action) || url_for(options[:url]), options[:html], &block)
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Works like form_remote_tag, but uses form_for semantics.
|
|
|
|
def remote_form_for(object_name, *args, &proc)
|
|
|
|
options = args.last.is_a?(Hash) ? args.pop : {}
|
|
|
|
concat(form_remote_tag(options), proc.binding)
|
|
|
|
fields_for(object_name, *(args << options), &proc)
|
|
|
|
concat('</form>', proc.binding)
|
|
|
|
end
|
|
|
|
alias_method :form_remote_for, :remote_form_for
|
|
|
|
|
|
|
|
# Returns a button input tag that will submit form using XMLHttpRequest
|
|
|
|
# in the background instead of regular reloading POST arrangement.
|
|
|
|
# <tt>options</tt> argument is the same as in <tt>form_remote_tag</tt>.
|
|
|
|
def submit_to_remote(name, value, options = {})
|
|
|
|
options[:with] ||= 'Form.serialize(this.form)'
|
|
|
|
|
|
|
|
options[:html] ||= {}
|
|
|
|
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 'eval(request.responseText)' which is the JavaScript function
|
|
|
|
# that form_remote_tag can call in :complete 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:
|
|
|
|
# <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 = ''
|
2007-02-09 09:04:31 +01:00
|
|
|
if options[:update] && options[:update].is_a?(Hash)
|
2007-01-22 14:43:50 +01:00
|
|
|
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]
|
2007-02-09 09:04:31 +01:00
|
|
|
url_options = url_options.merge(:escape => false) if url_options.is_a?(Hash)
|
2007-01-22 14:43:50 +01:00
|
|
|
function << "'#{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 makes
|
|
|
|
# an Ajax call when its contents have changed.
|
|
|
|
#
|
|
|
|
# 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 a function to be called instead.
|
|
|
|
#
|
|
|
|
# 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. This defaults
|
|
|
|
# to 'value', which in the evaluated context
|
|
|
|
# refers to the new field value. If you specify a
|
|
|
|
# string without a "=", it'll be extended to mean
|
|
|
|
# the form key that the value should be assigned to.
|
|
|
|
# So :with => "term" gives "'term'=value". If a "=" is
|
|
|
|
# present, no extension will happen.
|
|
|
|
# <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
|
|
|
|
# link_to_remote.
|
|
|
|
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
|
|
|
|
|
|
|
|
# Like +observe_field+, but operates on an entire form identified by the
|
|
|
|
# DOM ID +form_id+. +options+ are the same as +observe_field+, except
|
|
|
|
# the default value of the <tt>:with</tt> option evaluates to the
|
|
|
|
# serialized (request string) value of the form.
|
|
|
|
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:
|
|
|
|
#
|
|
|
|
# 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
|
|
|
|
#
|
|
|
|
# generates the following JavaScript:
|
|
|
|
#
|
|
|
|
# new Insertion.Bottom("list", "<li>Some item</li>");
|
|
|
|
# new Effect.Highlight("list");
|
|
|
|
# ["status-indicator", "cancel-link"].each(Element.hide);
|
|
|
|
#
|
|
|
|
# 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
|
|
|
|
#
|
|
|
|
# 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) "
|
2007-02-09 09:04:31 +01:00
|
|
|
javascript << "{ alert('RJS error:\\n\\n' + e.toString()); alert('#{source.gsub('\\','\0\0').gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }}'); throw e }"
|
2007-01-22 14:43:50 +01:00
|
|
|
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();
|
|
|
|
def [](id)
|
|
|
|
JavaScriptElementProxy.new(self, id)
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
# 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
|
|
|
|
|
2007-01-22 14:43:50 +01:00
|
|
|
# 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 # => $$('p.welcome b').first().hide();
|
|
|
|
#
|
|
|
|
# You can also use prototype enumerations with the collection. Observe:
|
|
|
|
#
|
|
|
|
# page.select('#items li').each do |value|
|
|
|
|
# value.hide
|
|
|
|
# end
|
|
|
|
# # => $$('#items li').each(function(value) { value.hide(); });
|
|
|
|
#
|
|
|
|
# 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:
|
|
|
|
#
|
|
|
|
# page.select('#items li').collect('hidden') do |item|
|
|
|
|
# item.hide
|
|
|
|
# end
|
|
|
|
# # => var hidden = $$('#items li').collect(function(value, index) { return value.hide(); });
|
|
|
|
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 preceeding 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'.
|
|
|
|
# insert_html :before, 'content', :partial => 'navigation'
|
|
|
|
#
|
|
|
|
# # Add a list item to the bottom of the <ul> with ID 'list'.
|
|
|
|
# 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.
|
|
|
|
# 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.
|
2007-02-09 09:04:31 +01:00
|
|
|
# replace 'person-45', :partial => 'person', :object => @person
|
2007-01-22 14:43:50 +01:00
|
|
|
#
|
|
|
|
# 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
|
|
|
|
# page.insert_html :bottom, :partial => 'person', :object => @person
|
|
|
|
#
|
|
|
|
# # Replace an existing person
|
|
|
|
# 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.
|
|
|
|
def remove(*ids)
|
2007-02-09 09:04:31 +01:00
|
|
|
loop_on_multiple_args 'Element.remove', ids
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Shows hidden DOM elements with the given +ids+.
|
|
|
|
def show(*ids)
|
2007-02-09 09:04:31 +01:00
|
|
|
loop_on_multiple_args 'Element.show', ids
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Hides the visible DOM elements with the given +ids+.
|
|
|
|
def hide(*ids)
|
2007-02-09 09:04:31 +01:00
|
|
|
loop_on_multiple_args 'Element.hide', ids
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Toggles the visibility of the DOM elements with the given +ids+.
|
|
|
|
def toggle(*ids)
|
2007-02-09 09:04:31 +01:00
|
|
|
loop_on_multiple_args 'Element.toggle', ids
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Displays an alert dialog with the given +message+.
|
|
|
|
def alert(message)
|
|
|
|
call 'alert', message
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
# Redirects the browser to the given +location+, in the same form as +url_for+.
|
2007-01-22 14:43:50 +01:00
|
|
|
def redirect_to(location)
|
|
|
|
assign 'window.location.href', @context.url_for(location)
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
# 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.
|
|
|
|
def call(function, *arguments, &block)
|
|
|
|
record "#{function}(#{arguments_for_call(arguments, block)})"
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
|
|
|
|
# Assigns the JavaScript +variable+ the given +value+.
|
|
|
|
def assign(variable, value)
|
|
|
|
record "#{variable} = #{javascript_object_for(value)}"
|
|
|
|
end
|
|
|
|
|
|
|
|
# Writes raw JavaScript to the page.
|
|
|
|
def <<(javascript)
|
|
|
|
@lines << javascript
|
|
|
|
end
|
|
|
|
|
|
|
|
# Executes the content of the block after a delay of +seconds+. Example:
|
|
|
|
#
|
|
|
|
# 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
|
2007-02-09 09:04:31 +01:00
|
|
|
def loop_on_multiple_args(method, ids)
|
|
|
|
record(ids.size>1 ?
|
|
|
|
"#{javascript_object_for(ids)}.each(#{method})" :
|
|
|
|
"#{method}(#{ids.first.to_json})")
|
|
|
|
end
|
|
|
|
|
2007-01-22 14:43:50 +01:00
|
|
|
def page
|
|
|
|
self
|
|
|
|
end
|
|
|
|
|
|
|
|
def record(line)
|
2007-02-09 09:04:31 +01:00
|
|
|
returning line = "#{line.to_s.chomp.gsub(/\;\z/, '')};" do
|
2007-01-22 14:43:50 +01:00
|
|
|
self << line
|
|
|
|
end
|
|
|
|
end
|
|
|
|
|
|
|
|
def render(*options_for_render)
|
|
|
|
Hash === options_for_render.first ?
|
|
|
|
@context.render(*options_for_render) :
|
|
|
|
options_for_render.first.to_s
|
|
|
|
end
|
|
|
|
|
|
|
|
def javascript_object_for(object)
|
|
|
|
object.respond_to?(:to_json) ? object.to_json : object.inspect
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
def arguments_for_call(arguments, block = nil)
|
|
|
|
arguments << block_to_function(block) if block
|
2007-01-22 14:43:50 +01:00
|
|
|
arguments.map { |argument| javascript_object_for(argument) }.join ', '
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
def block_to_function(block)
|
|
|
|
generator = self.class.new(@context, &block)
|
|
|
|
literal("function() { #{generator.to_s} }")
|
|
|
|
end
|
|
|
|
|
2007-01-22 14:43:50 +01:00
|
|
|
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.
|
|
|
|
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.
|
2007-02-09 09:04:31 +01:00
|
|
|
#
|
|
|
|
# +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
|
2007-01-22 14:43:50 +01:00
|
|
|
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
|
|
|
|
|
|
|
|
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].include?("=")
|
|
|
|
options[:with] = "'#{options[:with]}=' + value"
|
|
|
|
else
|
|
|
|
options[:with] ||= 'value' if options[:update]
|
|
|
|
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 < Builder::BlankSlate #:nodoc:
|
|
|
|
def initialize(generator, root = nil)
|
|
|
|
@generator = generator
|
|
|
|
@generator << root if root
|
|
|
|
end
|
|
|
|
|
|
|
|
private
|
2007-02-09 09:04:31 +01:00
|
|
|
def method_missing(method, *arguments, &block)
|
2007-01-22 14:43:50 +01:00
|
|
|
if method.to_s =~ /(.*)=$/
|
|
|
|
assign($1, arguments.first)
|
|
|
|
else
|
2007-02-09 09:04:31 +01:00
|
|
|
call("#{method.to_s.camelize(:lower)}", *arguments, &block)
|
2007-01-22 14:43:50 +01:00
|
|
|
end
|
|
|
|
end
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
def call(function, *arguments, &block)
|
|
|
|
append_to_function_chain!("#{function}(#{@generator.send(:arguments_for_call, arguments, block)})")
|
2007-01-22 14:43:50 +01:00
|
|
|
self
|
|
|
|
end
|
|
|
|
|
|
|
|
def assign(variable, value)
|
|
|
|
append_to_function_chain!("#{variable} = #{@generator.send(:javascript_object_for, value)}")
|
|
|
|
end
|
|
|
|
|
|
|
|
def function_chain
|
2007-02-09 09:04:31 +01:00
|
|
|
@function_chain ||= @generator.instance_variable_get(:@lines)
|
2007-01-22 14:43:50 +01:00
|
|
|
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
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
# 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
|
|
|
|
|
2007-01-22 14:43:50 +01:00
|
|
|
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
|
|
|
|
|
2007-02-09 09:04:31 +01:00
|
|
|
def reload(options_for_replace = {})
|
|
|
|
replace(options_for_replace.merge({ :partial => @id.to_s }))
|
2007-01-22 14:43:50 +01:00
|
|
|
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
|
|
|
|
@variable
|
|
|
|
end
|
|
|
|
|
|
|
|
private
|
|
|
|
def append_to_function_chain!(call)
|
|
|
|
@generator << @variable if @empty
|
|
|
|
@empty = false
|
|
|
|
super
|
|
|
|
end
|
|
|
|
end
|
|
|
|
|
|
|
|
class JavaScriptCollectionProxy < JavaScriptProxy #:nodoc:
|
2007-02-09 09:04:31 +01:00
|
|
|
ENUMERABLE_METHODS_WITH_RETURN = [:all, :any, :collect, :map, :detect, :find, :find_all, :select, :max, :min, :partition, :reject, :sort_by] unless defined? ENUMERABLE_METHODS_WITH_RETURN
|
|
|
|
ENUMERABLE_METHODS = ENUMERABLE_METHODS_WITH_RETURN + [:each] unless defined? ENUMERABLE_METHODS
|
2007-01-22 14:43:50 +01:00
|
|
|
attr_reader :generator
|
|
|
|
delegate :arguments_for_call, :to => :generator
|
|
|
|
|
|
|
|
def initialize(generator, pattern)
|
|
|
|
super(generator, @pattern = pattern)
|
|
|
|
end
|
|
|
|
|
|
|
|
def grep(variable, pattern, &block)
|
|
|
|
enumerate :grep, :variable => variable, :return => true, :method_args => [pattern], :yield_args => %w(value index), &block
|
|
|
|
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
|
2007-02-09 09:04:31 +01:00
|
|
|
|
|
|
|
require File.dirname(__FILE__) + '/javascript_helper'
|