Add getParameterByName

app/assets/javascripts/filtered_search/filtered_search_manager.js.es6

@@ -138,24 +138,10 @@
 
     search() {
       let paths = [];
-
-      // Check current state
-      const currentPath = window.location.search;
-      const stateIndex = currentPath.indexOf('state=');
-      const defaultState = 'opened';
-      let currentState = defaultState;
-
       const { tokens, searchToken } = this.tokenizer.processTokens(this.filteredSearchInput.value);
-
-      if (stateIndex !== -1) {
-        // Get currentState from url params if available
-        const remaining = currentPath.slice(stateIndex + 'state='.length);
-        const separatorIndex = remaining.indexOf('&');
-
-        currentState = separatorIndex === -1 ? remaining : remaining.slice(0, separatorIndex);
-      }
-
+      const currentState = gl.utils.getParameterByName('state') || 'opened';
       paths.push(`state=${currentState}`);
+
       tokens.forEach((token) => {
         const match = gl.FilteredSearchTokenKeys.get().filter(t => t.key === token.key)[0];
         let tokenPath = '';

app/assets/javascripts/lib/utils/common_utils.js.es6

@@ -124,6 +124,22 @@
       return parsedUrl.pathname.charAt(0) === '/' ? parsedUrl.pathname : '/' + parsedUrl.pathname;
     };
 
+    gl.utils.getParameterByName = function(name) {
+      var url = window.location.href;
+      var param = name.replace(/[[\]]/g, '\\$&');
+      var regex = new RegExp(`[?&]${param}(=([^&#]*)|&|#|$)`);
+      var results = regex.exec(url);
+
+      if (!results) {
+        return null;
+      }
+
+      if (!results[2]) {
+        return '';
+      }
+      return decodeURIComponent(results[2].replace(/\+/g, ' '));
+    };
+
     gl.utils.isMetaKey = function(e) {
       return e.metaKey || e.ctrlKey || e.altKey || e.shiftKey;
     };