https://www.johnsoncitytx.org/wp-content/plugins/wp-proud-core/mod…/assets/js/proud-accessibility.js?ver=7.1.2

1(function($, Proud) {
2
3  /**
4   * Forces alt text on image insert
5   */
6
7  $(document).ready( function(){
8
9    // Extend the WP backbone model for the image button
10    if (window.wp && window.wp.media && window.wp.media.view && window.wp.media.view.Button) {
11      window.wp.media.view.Button = window.wp.media.view.Button.extend({
12        // Save orig
13        oldInitialize: window.wp.media.view.Button.prototype.initialize,
14        // Add our click processing
15        click: function(event){
16          // In insert mode
17          if (this.$el.hasClass('media-button-insert') || this.$el.hasClass('media-button-select')) {
18            // Check if alt has value
19            var $alt = $('[data-setting="alt"] input:visible');
20            if ($alt.length && !$alt.val()) {
21              // Make input obvious
22              $alt.css({ 'border-color': 'red' })
23              // Make label red, add required
24              $alt.siblings('label, span')
25                .css({ color: 'red' })
26                .append('<abbr class="required">*</abbr>');
27              // Append msg
28              $alt.after(
29                $('<p class="help-block">See <a href="http://webaim.org/techniques/alttext/" target="_blank">this for more information</a>.</p>')
30                  .css({ 
31                    clear: 'both',
32                    color: 'red',
33                    float: 'right',
34                    width: '65%',
35                  })
36              );
37              alert('Please provide the "alt" text for the image.')
38              event.preventDefault();
39              return false;
40            }
41          }
42          this.oldClick(event);
43        },
44        // Save orig
45        oldClick: window.wp.media.view.Button.prototype.click,
46      });
47    }
48  });
49})(jQuery, Proud);