[Pkg-javascript-commits] [backbone] 65/211: Throw an error if Backbone.history.start is called twice.

[Jonas Smedegaard]

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js pushed a commit to tag 0.5.0
in repository backbone.

commit f1e0f6b5c18f7f347eca6c67767381f77490faee
Author: Jeremy Ashkenas <jashkenas at gmail.com>
Date:   Mon Feb 7 10:28:13 2011 -0500

    Throw an error if Backbone.history.start is called twice.
---
 backbone.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backbone.js b/backbone.js
index 8c2309a..8cf40f1 100644
--- a/backbone.js
+++ b/backbone.js
@@ -709,6 +709,9 @@
   // Cached regex for cleaning hashes.
   var hashStrip = /^#*/;
 
+  // Has the history handling already been started?
+  var historyStarted = false;
+
   // Set up all inheritable **Backbone.History** properties and methods.
   _.extend(Backbone.History.prototype, {
 
@@ -724,6 +727,7 @@
     // Start the hash change handling, returning `true` if the current URL matches
     // an existing route, and `false` otherwise.
     start : function() {
+      if (historyStarted) throw new Error("Backbone.history has already been started.");
       var docMode = document.documentMode;
       var oldIE = ($.browser.msie && (!docMode || docMode <= 7));
       if (oldIE) {
@@ -734,6 +738,7 @@
       } else {
         setInterval(this.checkUrl, this.interval);
       }
+      historyStarted = true;
       return this.loadUrl();
     },
 

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