Set a window variable to null
Takeaway: If you're working with JavaScript windows, you may need to set a windows variable to null at some point in time. Here's how.
By Brent Lee Metcalfe
Let's get what may seem like the most trivial tip--but the most important tip overall--out of the way. Before you declare a variable for a window open() method, declare it as a global variable and set it to null. Something similar to this:
<html>
// window conditions and statements go here
}
If you don't implement this simple tip, crucial windowing code will fail. Setting a global variable to null lets you query the value of a corresponding local variable before the local variable has (or no longer has) a value.
Brent Lee Metcalfe is a Web architecture consultant.
<head>
<script language="JavaScript">
<--
var windowVariable = null;
function launchWindow() {
windowVariable = window.open();
//-->
</script>
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