JavaScript autopopulate a text box

I have a JSP page which has two text boxes.
I would like to be able to enter a number into the first textbox, and to have that number automatically appear in the second textbox multiplied by 3.
So if I enter number 1 into the first text box, then I want number 3 appear in the second text box.
Does anyone know how to do that? Do I need to use JavaScript for that?

Thank you!

Oct 25 '07 #1

Subscribe Post Reply

7670

Ferris

101

100+

hi

yes,you do need javascript...

here's the code I write for you:

[HTML]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<script language="javascript">
function mul()
{
var a = document.getElementById("first").value;
document.getElementById("second").setAttribute("va lue",a * 3);
}
</script>
<body>
<input type="text" id="first" onChange="mul();" value="0" />
<input type="text" id="second" value="0" />
</body>
</html>

[/HTML]

Oct 25 '07 #2

jambyl

Ferris,
Thank you for such a quick reply!!! You code works good, but right now after typing a number in my first text box - I have to click somewhere or hit TAB, Only then the second text box is multiplied by three.
Is there a way to have the number in second text box change without me leaving the first box?

Kind regards.

Oct 25 '07 #3

Ferris

101

100+

hi

change line 16 :
<input type="text" id="first" onChange="mul();" value="0" />

into

<input type="text" id="first" onKeyUp="mul();" value="0" />

Oct 25 '07 #4

jambyl

Ferris,
This works great!!!

Thank you!!!

Oct 25 '07 #5

helimeef

hi

change line 16 :
<input type="text" id="first" onChange="mul();" value="0" />

into

<input type="text" id="first" onKeyUp="mul();" value="0" />

Don't do that Ferris! IE doesn't support key events, use a setInterval every few seconds to fill er up.

Oct 26 '07 #6

Ferris

101

100+

Don't do that Ferris! IE doesn't support key events, use a setInterval every few seconds to fill er up.

thanks for telling me that,but I have tested my code in both IE and Firefox,they works well.

Oct 26 '07 #7

acoder

16,027

Expert Mod 8TB

Don't do that Ferris! IE doesn't support key events, use a setInterval every few seconds to fill er up.

What makes you say that? Can you give an example that doesn't work?

Oct 29 '07 #8

helimeef

What makes you say that? Can you give an example that doesn't work?

Sorry I guess it does. I think it's IE6 that doesn't support. Maybe just starting to have nightmares about IE :p

Dec 28 '07 #9

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