https://www.mcgill.ca/root/js/js_RulCPHj8aUtatsXPqRSFtJIhBjBSAzFXZzADEVD4CHY.js

1/*! jquery.cookie v1.4.1 | MIT */
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3(function ($) {
4
5/**
6 * Prevents consecutive form submissions of identical form values.
7 *
8 * Repetitive form submissions that would submit the identical form values are
9 * prevented, unless the form values are different from the previously
10 * submitted values.
11 *
12 * This is a simplified re-implementation of a user-agent behavior that should
13 * be natively supported by major web browsers, but at this time, only Firefox
14 * has a built-in protection.
15 *
16 * A form value-based approach ensures that the constraint is triggered for
17 * consecutive, identical form submissions only. Compared to that, a form
18 * button-based approach would (1) rely on [visible] buttons to exist where
19 * technically not required and (2) require more complex state management if
20 * there are multiple buttons in a form.
21 *
22 * This implementation is based on form-level submit events only and relies on
23 * jQuery's serialize() method to determine submitted form values. As such, the
24 * following limitations exist:
25 *
26 * - Event handlers on form buttons that preventDefault() do not receive a
27 *   double-submit protection. That is deemed to be fine, since such button
28 *   events typically trigger reversible client-side or server-side operations
29 *   that are local to the context of a form only.
30 * - Changed values in advanced form controls, such as file inputs, are not part
31 *   of the form values being compared between consecutive form submits (due to
32 *   limitations of jQuery.serialize()). That is deemed to be acceptable,
33 *   because if the user forgot to attach a file, then the size of HTTP payload
34 *   will most likely be small enough to be fully passed to the server endpoint
35 *   within (milli)seconds. If a user mistakenly attached a wrong file and is
36 *   technically versed enough to cancel the form submission (and HTTP payload)
37 *   in order to attach a different file, then that edge-case is not supported
38 *   here.
39 *
40 * Lastly, all forms submitted via HTTP GET are idempotent by definition of HTTP
41 * standards, so excluded in this implementation.
42 */
43Drupal.behaviors.formSingleSubmit = {
44  attach: function () {
45    function onFormSubmit (e) {
46      var $form = $(e.currentTarget);
47      var formValues = $form.serialize();
48      var previousValues = $form.attr('data-drupal-form-submit-last');
49      if (previousValues === formValues) {
50        e.preventDefault();
51      }
52      else {
53        $form.attr('data-drupal-form-submit-last', formValues);
54      }
55    }
56
57    $('body').once('form-single-submit')
58      .delegate('form:not([method~="GET"])', 'submit.singleSubmit', onFormSubmit);
59  }
60};
61
62})(jQuery);
63;