javascript - How to show unbeforeunload alert when form is filled? -

i want show "onbeforeunload alert" when tab closed when fill form , close tab "onbeforeunload alert" isn't appearing.

how can change code "onbeforeunload alert" can show when form filled? there's code use:

window.onbeforeunload = confirmexit;  function confirmexit() {   return "you exit system before freezing declaration!     if leave , never return freeze declaration; not     go effect , may lose tax deduction, sure want leave     now?"; } $(function() {   $("a").click(function() {     window.onbeforeunload = null;   });   $("input").click(function() {     window.onbeforeunload = null;   }); }); 

how can change code "unbeforeunload alert" can show when form filled?

you clicking <input /> filling form right? once click <input />, unbeforeunload set null (removing alert) following code:

$("input").click(function() {   window.onbeforeunload = null; }); 

kindly remove code, , set. :) or can target submit button, more specifically:

$("input").click(function() {   window.onbeforeunload = null; }); $("input[type='submit']").click(function() {   window.onbeforeunload = confirmexit; });