I have more than 2 text field in html. I want to validate first field and if its not validate and than alert shows on page. and i don't want to send control on second field. so I wrote in onchange event on this field and in this I wrote this.focus() and this.select(); but its not work. If only one field in form than this problem solved but for more than 2 field it can not solve. Please any body can help me.