method

remote_function

v2.1.0 - Show latest stable - 2 notes - Class: ActionView::Helpers::PrototypeHelper

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What's this?

remote_function(options) public

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>

Show source

# File actionpack/lib/action_view/helpers/prototype_helper.rb, line 442
      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

August 13, 2009

3 thanks

With multiple parameters

Example

remote_function(
   :url => some_remote_function_path, 
   :with => "'key1='+$('elem_id').value +'&key2='+$('elem_id').value+ '&this_elem_value='+value"
)

April 16, 2009

3 thanks

Example

This function can be used to pass the ID of selected item, for example:

# with select or collection_select helpers:
{ :onchange => remote_function(:url => { :action => 'do_smth' }, :with => "'id=' + $('the_id').value") }

# and grab ID in controller action as usually: 
YourModel.find(params[:id])

remote_function

Related methods

With multiple parameters

Example

Example