// $Id: ajax_poll.js,v 1.1 2010/07/11 05:37:21 quicksketch Exp $

/**
 * @file
 * Provides AJAX-voting capabilities to the normal Poll voting form.
 */

/**
 * Behavior to add AJAX voting support to polls.
 */
Drupal.behaviors.ajaxPoll = function(context) {
  $('form.ajax-poll:not(.ajax-poll-processed)', context).addClass('ajax-poll-processed').each(function() {
    // Find the form and poll wrapper items that will be affected.
    var $form = $(this);
    var $pollWrapper = $form.parents('.content, .poll');

    // Find all the settings for this form.
    var url = $form.find('input[name=ajax_url]').val();
    var disabledText = $form.find('input[name=ajax_text]').val();
    var enabledText = $form.find('input.form-submit').val();

    // Set up the options for the AJAX voting mechanism.
    var options = {
      url: url,
      beforeSubmit: function(values, form, options) {
        if (disabledText) {
          $form.find('input.form-submit').attr('disabled', true).val(disabledText);
        }
      },
      success: function(response, status) {
        // Remove previous messages and re-enable the buttons in case anything
        // goes wrong after this.
        $form.find('input.form-submit').attr('disabled', '').val(enabledText);
        $form.find('.messages').remove();

        // Display any new messages.
        if (response.messages) {
          $form.prepend(response.messages);
        }

        // On success, replace the poll content with the new content.
        if (response.status) {
          $pollWrapper.html(response.output);
          // The action attribute will be the path of the AJAX Poll menu
          // callback. We fix this here for consistency, even though this will
          // be replaced by the AJAX Poll beforeSubmit() function above.
          $pollWrapper.find('form').attr('action', window.location.pathname);
          Drupal.attachBehaviors($pollWrapper[0]);
        }
      },
      complete: function(response, status) {
        $form.find('input.form-submit').attr('disabled', '').val(enabledText);

        if (status == 'error' || status == 'parsererror') {
          $form.prepend(Drupal.theme('ajaxPollError'));
        }
      },
      dataType: 'json',
      type: 'POST'
    };

    // Add the handlers to the Poll form through the jquery.form.js library.
    $form.ajaxForm(options)
  });
};

/**
 * A fallback error that is shown upon a complete failure.
 *
 * This error is only used when the server cannot return a properly themed
 * error. This is usually because the server is unavailable or because the JSON
 * returned is invalid JSON.
 *
 * The second situation is most frequently caused by modules appending extra
 * information to requests and causing improper JSON. Modules that may do this
 * include Devel, Memcache Admin, and other development modules that output
 * debugging code.
 */
Drupal.theme.prototype.ajaxPollError = function() {
  return '<div class="messages error">A parsing or network error has occurred.</div>';
};