beginner question... onChange?

Adrian Parker · Sep 10, 2004

This code is very simple, but it doesn't do anything.. can someone point
out what I'm doing wrong please..
When user enters text into t11, it should be copied to t12.

<HTML>
<HEAD>
<title>onChange Test</title>
</HEAD>
<BODY>
<script language="JavaScript">
function recalc()
{
document.frm.t12.value = document.frm.t11.value;
}
</script>
<FORM name="frm" method="post" action="post">
Source <input name="t11" type="text" onChange="recalc(); return
true;" />
<br>
Target <input name="t12" type="text" />
</FORM>
</BODY>
</HTML>

Michael Winter · Sep 10, 2004

This code is very simple, but it doesn't do anything.. can someone
point out what I'm doing wrong please.
When user enters text into t11, it should be copied to t12.

As far as I can see, it works exactly as it should. The change event
doesn't fire until the control loses focus, and will only fire if the
value changed between the control getting focus and losing it again. Type
something then press Tab or click somewhere with the mouse. The value will
be copied.

By the way, you can remove the return statement. It doesn't do anything.

[snip]

Mike

Adrian Parker · Sep 10, 2004

Ack!

Ok, found problem.. it's a good idea to not use a javascript function name
as your function name.. if I change recalc() to txtcalc() all is well.

-Adrian

Grant Wagner · Sep 10, 2004

Adrian said:
Ack!

Ok, found problem.. it's a good idea to not use a javascript function name
as your function name.. if I change recalc() to txtcalc() all is well.

-Adrian

"recalc" is a javascript function name? What implementation, what user agent?

It's not a reserved word in JavaScript 1.5:

<url:
http://devedge.netscape.com/library/manuals/2000/javascript/1.5/reference/keywords.html#1004016
/>

and it is "undefined" in IE6SP1, Netscape 4.78, Opera 6.05 and Opera 7.54.

Richard Cornford · Sep 10, 2004

Grant said:
"recalc" is a javascript function name? What implementation,
what user agent?

It is a method of the - document - object in IE 5.5+. It gets picked up
from event handling attribute code because IE's custom scope chains on
internally generated event handling functions include the - document -
object.

Of course that means that it is not a javascript/ECMAScript function at
all. (And I cannot remember what it is that the method does, I don't
remember it seeming that useful when I did look it up at MSDN.)

Richard.

Thomas 'PointedEars' Lahn · Sep 19, 2004

Richard said:
It is a method of the - document - object in IE 5.5+. It gets picked up
from event handling attribute code because IE's custom scope chains on
internally generated event handling functions include the - document -
object.

Of course that means that it is not a javascript/ECMAScript function at
all. (And I cannot remember what it is that the method does, I don't
remember it seeming that useful when I did look it up at MSDN.)

| recalc Method
|
| Recalculates all dynamic properties in the current document.

<http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/recalc.asp>

PointedEars

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beginner question... onChange?

Adrian Parker

Michael Winter

Adrian Parker

Grant Wagner

Richard Cornford

Thomas 'PointedEars' Lahn

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