Hi all, I am trying to do a custom validation on a textfield form. The field hold as value a list of email addresses. here is my custom validation Ext.apply(Ext.form.VTypes,{ emailList: function(val, field){ parent=this; var emails=field.getValue(); var regex=/^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;; var email = emails.split(','); var result= new Array(); for (var i = 0; i < email.length; i++) { result= regex.test(email[i]); } //check if an email address is false if( Ext.Array.indexOf(result,'false') ) return true; else return false; }, emailListText: 'One or more email addresses entered is invalid in the mailTo fields!'//error message }); here is my textfield xtype: 'textfield', width: 673, anchor: '100%', name : 'mailTo', fieldLabel: 'Mail To', vtype : 'emailList', allowBlank : false, enableKeyEvents : true when i entered any value in the field mailto, i got the following error Ext.Array is undefined . Thank you for your help