144 lines
7.1 KiB
Ruby
144 lines
7.1 KiB
Ruby
|
module AutoCompleteMacrosHelper
|
||
|
# Adds AJAX autocomplete functionality to the text input field with the
|
||
|
# DOM ID specified by +field_id+.
|
||
|
#
|
||
|
# This function expects that the called action returns an HTML <ul> list,
|
||
|
# or nothing if no entries should be displayed for autocompletion.
|
||
|
#
|
||
|
# You'll probably want to turn the browser's built-in autocompletion off,
|
||
|
# so be sure to include an <tt>autocomplete="off"</tt> attribute with your text
|
||
|
# input field.
|
||
|
#
|
||
|
# The autocompleter object is assigned to a Javascript variable named <tt>field_id</tt>_auto_completer.
|
||
|
# This object is useful if you for example want to trigger the auto-complete suggestions through
|
||
|
# other means than user input (for that specific case, call the <tt>activate</tt> method on that object).
|
||
|
#
|
||
|
# Required +options+ are:
|
||
|
# <tt>:url</tt>:: URL to call for autocompletion results
|
||
|
# in url_for format.
|
||
|
#
|
||
|
# Addtional +options+ are:
|
||
|
# <tt>:update</tt>:: Specifies the DOM ID of the element whose
|
||
|
# innerHTML should be updated with the autocomplete
|
||
|
# entries returned by the AJAX request.
|
||
|
# Defaults to <tt>field_id</tt> + '_auto_complete'
|
||
|
# <tt>:with</tt>:: A JavaScript expression specifying the
|
||
|
# parameters for the XMLHttpRequest. This defaults
|
||
|
# to 'fieldname=value'.
|
||
|
# <tt>:frequency</tt>:: Determines the time to wait after the last keystroke
|
||
|
# for the AJAX request to be initiated.
|
||
|
# <tt>:indicator</tt>:: Specifies the DOM ID of an element which will be
|
||
|
# displayed while autocomplete is running.
|
||
|
# <tt>:tokens</tt>:: A string or an array of strings containing
|
||
|
# separator tokens for tokenized incremental
|
||
|
# autocompletion. Example: <tt>:tokens => ','</tt> would
|
||
|
# allow multiple autocompletion entries, separated
|
||
|
# by commas.
|
||
|
# <tt>:min_chars</tt>:: The minimum number of characters that should be
|
||
|
# in the input field before an Ajax call is made
|
||
|
# to the server.
|
||
|
# <tt>:on_hide</tt>:: A Javascript expression that is called when the
|
||
|
# autocompletion div is hidden. The expression
|
||
|
# should take two variables: element and update.
|
||
|
# Element is a DOM element for the field, update
|
||
|
# is a DOM element for the div from which the
|
||
|
# innerHTML is replaced.
|
||
|
# <tt>:on_show</tt>:: Like on_hide, only now the expression is called
|
||
|
# then the div is shown.
|
||
|
# <tt>:after_update_element</tt>:: A Javascript expression that is called when the
|
||
|
# user has selected one of the proposed values.
|
||
|
# The expression should take two variables: element and value.
|
||
|
# Element is a DOM element for the field, value
|
||
|
# is the value selected by the user.
|
||
|
# <tt>:select</tt>:: Pick the class of the element from which the value for
|
||
|
# insertion should be extracted. If this is not specified,
|
||
|
# the entire element is used.
|
||
|
# <tt>:method</tt>:: Specifies the HTTP verb to use when the autocompletion
|
||
|
# request is made. Defaults to POST.
|
||
|
def auto_complete_field(field_id, options = {})
|
||
|
function = "var #{field_id}_auto_completer = new Ajax.Autocompleter("
|
||
|
function << "'#{field_id}', "
|
||
|
function << "'" + (options[:update] || "#{field_id}_auto_complete") + "', "
|
||
|
function << "'#{url_for(options[:url])}'"
|
||
|
|
||
|
js_options = {}
|
||
|
js_options[:tokens] = array_or_string_for_javascript(options[:tokens]) if options[:tokens]
|
||
|
js_options[:callback] = "function(element, value) { return #{options[:with]} }" if options[:with]
|
||
|
js_options[:indicator] = "'#{options[:indicator]}'" if options[:indicator]
|
||
|
js_options[:select] = "'#{options[:select]}'" if options[:select]
|
||
|
js_options[:paramName] = "'#{options[:param_name]}'" if options[:param_name]
|
||
|
js_options[:frequency] = "#{options[:frequency]}" if options[:frequency]
|
||
|
js_options[:method] = "'#{options[:method].to_s}'" if options[:method]
|
||
|
|
||
|
{ :after_update_element => :afterUpdateElement,
|
||
|
:on_show => :onShow, :on_hide => :onHide, :min_chars => :minChars }.each do |k,v|
|
||
|
js_options[v] = options[k] if options[k]
|
||
|
end
|
||
|
|
||
|
function << (', ' + options_for_javascript(js_options) + ')')
|
||
|
|
||
|
javascript_tag(function)
|
||
|
end
|
||
|
|
||
|
# Use this method in your view to generate a return for the AJAX autocomplete requests.
|
||
|
#
|
||
|
# Example action:
|
||
|
#
|
||
|
# def auto_complete_for_item_title
|
||
|
# @items = Item.find(:all,
|
||
|
# :conditions => [ 'LOWER(description) LIKE ?',
|
||
|
# '%' + request.raw_post.downcase + '%' ])
|
||
|
# render :inline => "<%= auto_complete_result(@items, 'description') %>"
|
||
|
# end
|
||
|
#
|
||
|
# The auto_complete_result can of course also be called from a view belonging to the
|
||
|
# auto_complete action if you need to decorate it further.
|
||
|
def auto_complete_result(entries, field, phrase = nil)
|
||
|
return unless entries
|
||
|
items = entries.map { |entry| content_tag("li", phrase ? highlight(entry[field], phrase) : h(entry[field])) }
|
||
|
content_tag("ul", items.uniq)
|
||
|
end
|
||
|
|
||
|
# Wrapper for text_field with added AJAX autocompletion functionality.
|
||
|
#
|
||
|
# In your controller, you'll need to define an action called
|
||
|
# auto_complete_for to respond the AJAX calls,
|
||
|
#
|
||
|
def text_field_with_auto_complete(object, method, tag_options = {}, completion_options = {})
|
||
|
(completion_options[:skip_style] ? "" : auto_complete_stylesheet) +
|
||
|
text_field(object, method, tag_options) +
|
||
|
content_tag("div", "", :id => "#{object}_#{method}_auto_complete", :class => "auto_complete") +
|
||
|
auto_complete_field("#{object}_#{method}", { :url => { :action => "auto_complete_for_#{object}_#{method}" } }.update(completion_options))
|
||
|
end
|
||
|
|
||
|
private
|
||
|
def auto_complete_stylesheet
|
||
|
content_tag('style', <<-EOT, :type => Mime::CSS)
|
||
|
div.auto_complete {
|
||
|
width: 350px;
|
||
|
background: #fff;
|
||
|
}
|
||
|
div.auto_complete ul {
|
||
|
border:1px solid #888;
|
||
|
margin:0;
|
||
|
padding:0;
|
||
|
width:100%;
|
||
|
list-style-type:none;
|
||
|
}
|
||
|
div.auto_complete ul li {
|
||
|
margin:0;
|
||
|
padding:3px;
|
||
|
}
|
||
|
div.auto_complete ul li.selected {
|
||
|
background-color: #ffb;
|
||
|
}
|
||
|
div.auto_complete ul strong.highlight {
|
||
|
color: #800;
|
||
|
margin:0;
|
||
|
padding:0;
|
||
|
}
|
||
|
EOT
|
||
|
end
|
||
|
|
||
|
end
|