What causes the type error in Rails?

Adding a link_to_remote to load a modal dialog box from a partial resulted in an error message when running the application.

RJS error:

TypeError: $("create_event_dialog").dialog is not a function

After clicking ok, another dialog box appeared.

Element.update("create_event", "<form action=\"/countries\" class=\"new_country\" id=\"new_country\" method=\"post\" onsubmit=\"new Ajax.Request('/countries', {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)}); return false;\"><div style=\"margin:0;padding:0;display:inline\"><input name=\"authenticity_token\" type=\"hidden\" value=\"qWXCu2zMmlMhJG+GRf35kMbAIfzYAtFBee142ThmmMw=\" /></div>\n <p>\n    <label for=\"country_name\">Name</label><br />\n    <input id=\"country_name\" name=\"country[name]\" size=\"30\" type=\"text\" />\n  </p>\n  <p>\n    <input id=\"country_submit\" name=\"commit\" type=\"submit\" value=\"Create\" />\n  </p>\n</form>\n");   
$('create_event_dialog').dialog({
    title: 'New Event',
    modal: true,
    width: 500,
    close: function(event, ui) { $('create_event_dialog').dialog('destroy') }

});

The error occurred with the div having the id of create_event_dialog. Using Prototype, I am struggling to find a solution. Assistance would be greatly appreciated.

Answer №1

It seems like your code is aiming to utilize the jQuery UI dialog feature, which is not natively supported by Prototype or Scriptaculous.

If you wish to incorporate a jQuery UI dialog, there are two options available:

  1. Use both jQuery and jQuery UI in conjunction with Prototype.
  2. Remove Prototype entirely and use solely jQuery for your implementation.

Solution 1:

To integrate jQuery alongside Prototype, you will need to include the jQuery JavaScript libraries and activate compatibility mode by executing jQuery.noConflict(). Subsequently, the $ function will be reserved for Prototype, while all jQuery functionalities must be accessed through jQuery(...). For instance, in your scenario, it would be

jQuery('create_event_dialog').dialog(...)
.

Additional information on this setup can be found at Using jQuery with Other Libraries.

Solution 2:

To proceed with this approach, you must eliminate the Prototype libraries and instead incorporate the jQuery libraries. Furthermore, the jRails compatibility library should be utilized to retain your prototype helpers. Consequently, a transition from existing Prototype code to jQuery code is essential.

For example, the Element.update statement would be modified as follows:

$("#create_event".html("<form action=...")

Refer to Using jQuery with Ruby on Rails for further insights.

Caution: Option 2 may necessitate substantial effort depending on your current codebase, yet it leads to cleaner Javascript code. Moreover, contemplating a switch to Rails 3.1 with UJS and jQuery as the primary JavaScript library could prove beneficial.

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