Merge pull request #1013 from LibraryOfCongress/activity-ui-ms-edge-p…

…olyfills Polyfill Element.toggleAttribute for MS Edge < 18
LibraryOfCongress · May 28, 2019 · f22f831 · f22f831
2 parents a87b53b + 76cd2ad
commit f22f831
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/concordia/templates/action-app.html b/concordia/templates/action-app.html
@@ -20,6 +20,24 @@
             document.head.appendChild(s);
         })();
     </script>
+    <script>
+        // Used from https://developer.mozilla.org/en-US/docs/Web/API/Element/toggleAttribute#Polyfill under the MDN license
+        if (!Element.prototype.toggleAttribute) {
+            Element.prototype.toggleAttribute = function(name, force) {
+                if (force !== void 0) force = !!force;
+
+                if (this.getAttribute(name) !== null) {
+                    if (force) return true;
+                    this.removeAttribute(name);
+                    return false;
+                } else {
+                    if (force === false) return false;
+                    this.setAttribute(name, '');
+                    return true;
+                }
+            };
+        }
+    </script>
 {% endblock head_content %}
 
 {% block body_scripts %}