Warning Message Popup

Question

Hello All,

 

Here I have one web page like create. suddenly if i click on other tab need to show warining message like are sure want to leave 

 

this is my code:

 

<script type="text/javascript" language="javascript">

 

window.addEventListener("beforeunload", function (e) {

 

var confirmationMessage = 'It looks like you have been editing something.';

 

confirmationMessage += 'If you leave before saving, your changes will be lost.';

 

(e || window.event).returnValue = confirmationMessage;

return confirmationMessage;

 

}); 

</script>

 

But my problem if i fill all fields and submit i got error message for above code. i Need to get warning message only if i click other page or other tab

 

Please help...

 

Thanks in advance