Using javascript to change a HTML form value

Hi guys,

I don't know whether this is a HTML or Javascript question, but i decided to put it here.

This is my problem:

I am making a simple HTML form that posts a random number (generated by Javascript) on my website, but I'm having trouble assigning the random number to the form.

This is what I have right now:

Expand|Select|Wrap|Line Numbers

  
<html>
 
<head>
 
<title>xxx</title>
 
<script type="text/javascript">
 
function changejweet()

{
 
document.reply.topic.value = "***RANDOM NUMBER***";

document.reply.action = "http://site.com/post_reply/" +***RANDOM NUMBER***";
 
}
 
function randomnumber() 

{

    document.getElementById("rand").value = Math.round((1000000 - 500000) * Math.random() + 1);

}
 
</script>
 
</head>
 
<body onload=changejweet();>
 
<form name="reply" action="site.com/post_reply/" method="post">
 
<input type="hidden" name="topic" value="1">

<input type="hidden" name="skipVerbose" value="TRUE">

<input type="submit" name="submit" value="Click to send random number">
 
</form>
 
</body>
 
</html>

The ***RANDOM NUMBER*** is the values that I want to change into the random number.
I already tried:

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document.reply.topic.value = rand;

document.reply.action = "http://site.dom/post_reply/" + rand;

But that didnt work.

I am a javascript/HTML beginner and would like to know how to do this.

Can someone help me?

Thanks in advance !

MCV

Apr 5 '07 #1

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21985

acoder

16,027

Expert Mod 8TB

Welcome to TSDN.

You don't have an element with id "rand". Declare a variable, rand, and set that to the random number:

Expand|Select|Wrap|Line Numbers

var rand = ...Math.random...etc.

then use that to set the form value.

Apr 5 '07 #2

DutchKingCobra

Hi pal,
here you are:)

Expand|Select|Wrap|Line Numbers

 
<html>

<head>

<title>xxx</title>
 
<script type="text/javascript">

function randomnumber(){

randomnr=[Math.floor(Math.random()*10000000000)];

document.reply.rand.value = randomnr;

document.reply.topic.value = "***RANDOM NUMBER***";

document.reply.action = "http://site.com/post_reply/" + randomnr;

}

</script>

</head>

<body>
 
<form name="reply" action="site.com/post_reply/" method="post" onsubmit="randomnumber()">

<input type="hidden" name="topic" value="1">

<input type="hidden" name="rand" value="random number">

<input type="hidden" name="skipVerbose" value="TRUE">

<input type="submit" name="submit" value="Click to send random number">

</form>
 
</body>

</html>

well HTH
peace

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