SOLR-14120: Solr Admin UI breaks when using IE11

solr/CHANGES.txt

@@ -157,6 +157,9 @@ New Features
 
 Improvements
 ---------------------
+* SOLR-14120: Define JavaScript methods 'includes' and 'startsWith' to ensure AdminUI can be displayed when using 
+  Internet Explorer 11 (jafurrer).
+
 * SOLR-14042: Fix varargs precommit warnings (Andraas Salamon via Jason Gerlowski)
 
 * SOLR-14095: Replace Java serialization with Javabin in the Overseer queues (Tomás Fernández Löbbe)

solr/webapp/web/js/angular/app.js

@@ -15,6 +15,36 @@
  limitations under the License.
 */
 
+/* SOLR-14120: Providing a manual definition for the methods 'includes' and 'startsWith' to support Internet Explorer 11. */
+if (!String.prototype.includes) {
+  String.prototype.includes = function(search, start) { 'use strict';
+  if (search instanceof RegExp) {
+    throw TypeError('first argument must not be a RegExp');
+  } 
+  if (start === undefined) { start = 0; }
+    return this.indexOf(search, start) !== -1;
+  };
+}
+if (!Array.prototype.includes) {
+  Object.defineProperty(Array.prototype, "includes", {
+    enumerable: false,
+    value: function(obj) {
+    var newArr = this.filter(function(el) {
+      return el == obj;
+    });
+    return newArr.length > 0;
+    }
+  });
+}
+if (!String.prototype.startsWith) {
+  Object.defineProperty(String.prototype, 'startsWith', {
+    value: function(search, rawPos) {
+    var pos = rawPos > 0 ? rawPos|0 : 0;
+    return this.substring(pos, pos + search.length) === search;
+    }
+  });
+}
+
 var solrAdminApp = angular.module("solrAdminApp", [
   "ngResource",
   "ngRoute",