Functions in JavaScript

5 pts.
Tags:
JavaScript
JavaScript functions
Web development
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?

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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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