Implementation of indexOf for IE

totemstech · Jun 7, 2012 · 0e052c5 · 0e052c5
1 parent 43126bd
commit 0e052c5
Showing 1 changed file with 38 additions and 1 deletion.
diff --git a/src/base.js b/src/base.js
@@ -190,7 +190,44 @@ CELL.unique = function(that) {
   return a;
 };
 
-
+/**
+ * Implementation of indexOf()
+ * indexOf() is not available on all browsers
+ * such as Internet Explorer
+ * See https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
+ */
+if (!Array.prototype.indexOf) {  
+  Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {  
+    "use strict";  
+    if (this == null) {  
+      throw new TypeError();  
+    }  
+    var t = Object(this);  
+    var len = t.length >>> 0;  
+    if (len === 0) {  
+      return -1;  
+    }  
+    var n = 0;  
+    if (arguments.length > 0) {  
+      n = Number(arguments[1]);  
+      if (n != n) { // shortcut for verifying if it's NaN  
+        n = 0;  
+      } else if (n != 0 && n != Infinity && n != -Infinity) {  
+        n = (n > 0 || -1) * Math.floor(Math.abs(n));  
+      }  
+    }  
+    if (n >= len) {  
+      return -1;  
+    }  
+    var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);  
+    for (; k < len; k++) {  
+      if (k in t && t[k] === searchElement) {  
+        return k;  
+      }  
+    }  
+    return -1;  
+  }  
+}
 
 CELL.DEBUG = false;