How to know the child window closing event of window.open of output in the parent window

2020-03-26 21:23:43
OfStack

 
<HTML> 
<BODY> 
<P> </P> 
<form name=fm_Info> 
<input type=text name=txtValue> 
</form> 
<script language=javascript> 
var timer 
var winOpen 
function IfWindowClosed() { 
if (winOpen.closed == true) { 
document.fm_Info.txtValue.value="child closed" 
window.clearInterval(timer) 
} 
} 
</script> 
<input type=button name=btnOpen value=open> 

<script language=javascript for=btnOpen event=onclick> 
document.fm_Info.txtValue.value="" 
winOpen=window.open("child.htm","","toolbar=no, location=no, directories=no, status=no, menubar=no" ) 
timer=window.setInterval("IfWindowClosed()",500); 
</script> 
</BODY> 
</HTML>