Functions in JavaScript
function pcs()
{
var t1=document.getElementById("tot1").value
var pb=document.getElementById("pcbox").value
var pc=""
if(t1==! && pb==!)
{
document.getElementId("rbox").innerHTML=""
}
}
My question is if the value t1 & pb = null means the function pcs() is not writern...How?
Software/Hardware used:
Software/Hardware used:
ASKED:
January 23, 2009 12:48 PM
UPDATED:
March 25, 2009 7:47 PM
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Answer Wiki:
You need to test t1 and pb for null before accessing the value property, e.g.
var t1 = document.getElementById("tot1");
var x;
if (t1 != null) {
x = t1.value;
}
The value property always returns a string, so it will never be null, because string objects return empty string but not null.
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