Java Script: Display Confirmation Dialog prior to Form submit.

How to display a confirmation dialog, prior to form submit ?
We achieve this  using Java Script.


The following java script code will do this.

<script type="text/javascript">

function confirmSubmit(){

var agree=confirm("Do you wish to continue?.This action cannot be undone.");

if (agree)
return true ;

else
return false ;

}

</script>

 In the Form element, we will have a submit button.

In that just call the java script code on onClick event of the button, as follows.

<input type="submit"  value='Submit' onClick="return confirmSubmit()"/>  

Just include the java script code at the end of title tag. 

(i.e)In between title tag and head tag.