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web/modules/contrib/webform/js/webform.element.computed.js

@@ -0,0 +1,64 @@
+/**
+ * @file
+ * JavaScript behaviors for computed elements.
+ */
+
+(function ($, Drupal, debounce) {
+
+  'use strict';
+
+  Drupal.webform = Drupal.webform || {};
+  Drupal.webform.computed = Drupal.webform.computed || {};
+  Drupal.webform.computed.delay = Drupal.webform.computed.delay || 500;
+
+  /**
+   * Initialize computed elements.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.webformComputed = {
+    attach: function (context) {
+      $(context).find('.js-webform-computed').once('webform-computed').each(function () {
+        // Get computed element and parent form.
+        var $element = $(this);
+        var $form = $element.closest('form');
+
+        // Get elements that are used by the computed element.
+        var elementKeys = $(this).data('webform-element-keys').split(',');
+        if (!elementKeys) {
+          return;
+        }
+
+        // Add event handler to elements that are used by the computed element.
+        $.each(elementKeys, function (i, key) {
+          $form.find(':input[name^="' + key + '"]')
+            .on('keyup change', debounce(triggerUpdate, Drupal.webform.computed.delay));
+        });
+
+        // Initialize computed element update which refreshes the displayed
+        // value and accounts for any changes to the #default_value for a
+        // computed element.
+        triggerUpdate();
+
+        function triggerUpdate() {
+          // Prevent duplicate computations.
+          // @see Drupal.behaviors.formSingleSubmit
+          var formValues = $form.find('input[name!=form_build_id]').serialize();
+          var previousValues = $element.attr('data-webform-computed-last');
+          if (previousValues === formValues) {
+            return;
+          }
+          $element.attr('data-webform-computed-last', formValues);
+
+          // Add loading class to computed wrapper.
+          $element.find('.js-webform-computed-wrapper')
+            .addClass('webform-computed-loading');
+
+          // Trigger computation.
+          $element.find('.js-form-submit').mousedown();
+        }
+      });
+    }
+  };
+
+})(jQuery, Drupal, Drupal.debounce);