1 files changed, 29 insertions, 0 deletions
diff --git a/lib/scripts/helpers.js b/lib/scripts/helpers.js
index 77e7ffc4a..b286965cf 100644
--- a/lib/scripts/helpers.js
+++ b/lib/scripts/helpers.js
@@ -163,3 +163,32 @@ function substr_replace(str, replace, start, length) {
     b1 = (length < 0 ? str.length : a2) + length;
     return str.substring(0, a2) + replace + str.substring(b1);
 }
+
+/**
+ * Bind variables to a function call creating a closure
+ *
+ * Use this to circumvent variable scope problems when creating closures
+ * inside a loop
+ *
+ * @author  Adrian Lang <lang@cosmocode.de>
+ * @link    http://www.cosmocode.de/en/blog/gohr/2009-10/15-javascript-fixing-the-closure-scope-in-loops
+ * @param   functionref fnc - the function to be called
+ * @param   mixed - any arguments to be passed to the function
+ * @returns functionref
+ */
+function bind(fnc/*, ... */) {
+    var Aps = Array.prototype.slice;
+    // Store passed arguments in this scope.
+    // Since arguments is no Array nor has an own slice method,
+    // we have to apply the slice method from the Array.prototype
+    var static_args = Aps.call(arguments, 1);
+
+    // Return a function evaluating the passed function with the
+    // given args and optional arguments passed on invocation.
+    return function (/* ... */) {
+        // Same here, but we use Array.prototype.slice solely for
+        // converting arguments to an Array.
+        return fnc.apply(this,
+                         static_args.concat(Aps.call(arguments, 0)));
+    };
+}