Set element by index
<html> <head> <script type="text/javascript"> var djConfig = { baseScriptUri : "js/dojo/", parseOnLoad : true }; </script> <script type="text/javascript" src="js/dojo/dojo/dojo.js"></script> <script> dojo.require("dojox.collections.ArrayList"); function testIt() { var al = new dojox.collections.ArrayList(); al.add("A"); al.add("B"); al.add("C"); al.add("D"); al.setByIndex(2, "M"); alert(al); } </script> </head> <body onLoad="testIt();"> </body> </html>