Trapping errors in URL formatting and displaying an error message

2015-01-19 10:15:34 -05:00
parent 66b3c76f9a
commit 80e96c7bd3
2 changed files with 52 additions and 12 deletions
@@ -53,8 +53,16 @@ export default class Regexper {
  }

  hashchangeListener() {
-    this.permalinkEnabled = true;
-    this.showExpression(this._getHash());
+    var expr = this._getHash();
+
+    if (expr instanceof Error) {
+      this.state = 'has-error';
+      this.error.innerHTML = 'Malformed expression in URL';
+      window._gaq.push(['_trackEvent', 'visualization', 'malformed URL']);
+    } else {
+      this.permalinkEnabled = true;
+      this.showExpression(expr);
+    }
  }

  bindListeners() {
@@ -69,7 +77,12 @@ export default class Regexper {
  }

  _getHash() {
-    return decodeURIComponent(location.hash.slice(1));
+    try {
+      return decodeURIComponent(location.hash.slice(1));
+    }
+    catch(e) {
+      return e;
+    }
  }

  set state(state) {