Confirm

Question: How do I generate an OK/Cancel dialog box from JavaScript?

Answer: To generate an OK/Cancel box, use the confirm() method:

if (confirm("Your question)) { 
 // do things if OK
}

The button above was created using the following code:

<form name=myform>
<input type=button value="Try it now" 
onClick="if(confirm('Format the hard disk?'))
alert('You are very brave!');
else alert('A wise decision!')">
</form>

Returned value:
If the user clicks OK, the confirm method returns true. If the user clicks Cancel, the method returns false.

See also other JavaScript dialogs: