Javascript Hidden field problem...

Hi,

I have the following piece of code:

<input type="hidden" name="item_number">

But how can i add a value thats equal to a variable, something like:

<input type="hidden" name="item_number" value = $var1>

Where var1 is set previously using javascript.

Thanks.

ive been trying for the last couple of days to get this working:

<script type="text/javascript">
document.write('<input type="hidden" name="item_name" value="'+displaytext1+'">');
</script>


without success! ive tried alot of variations. it links into paypal, but paypal does not show the description.

Sorry, im trying to feed the paypal shopping cart with a description, so nothing is displayed on my page, but is on the paypal page.

theres no problem hard coding the values, but i need to use a variable for the item description as its dynamic.

Thanks.

it is loaded on startup. a product id is passed in the URL and then this is decoded into a description - displaytext1.

Ive already done steps 1 and 2, but was told I can use javascript to achieve the hidden field problem. I have no PHP experience, thats why I want to avoid this, my pag is purely html and javascript.

To extract the id passed in the url using JavaScript you need to now the position of the id in the list of parameters that follow the '?' delimeter in the url. Then you can use;

Code: Select all

var prodID = location.search.substring(1);

or whatever its position is.
Decode the id into a description and use the

Code: Select all

document.getElementById...

example I posted earlier.

Thanks, i;ve now got the following:

<input type="hidden" name="business" id="email" value="">
<input type="hidden" name="item_name" id="descr" value="">
<input type="hidden" name="amount" id="num" value = "">

<script type="text/javascript">
document.getElementById("email").value = "email@hotmail.com";
document.getElementById("descr").value = displaytext1;
document.getElementById("num").value = num4;
</script>

but only the email works, cos its hard coded, but still cant get the variables to work.

file:///D:/Details.htm?n1=33700&n2=mit&n3=18&n4=25&n5=4

<script type="text/javascript">
function GetVars( def )
{
this._def_ = def;
var query, queries = top.location.search.substring(1).split( /\&/ );
for ( var i=0; (query = queries[ i ]); i++ )
{
query = query.split( /\=/ );
this[query[0]] = ( typeof query[1] == 'undefined' ) ? def : unescape(query[1]).replace( /\+/g, " " );
}
}
GetVars.prototype.exists = function( key )
{
return ( typeof this[key] != 'undefined' );
}
GetVars.prototype.assign = function( key )
{
return ( this.exists( key ) ) ? this[key] : this._def_;
}
var displaytext1;
var displaytext2;

var _GET = new GetVars( '' );
var num1 = _GET.assign( 'n1' );
var num2 = _GET.assign( 'n2' );
var num3 = _GET.assign( 'n3' );
var num4 = _GET.assign( 'n4' );
var num5 = _GET.assign( 'n5' );

switch (num1)
{
case '33700':
displaytext1='Test';
.
.
.

Is this ok? I know the assignments at the bottom definitely work. Getvars is called 'onload'.

after this code, ive 'writeln' the variables to the page and they are all correct, ie theres no 'n1=' within any of the variables, they contain the text i need.

its just the getelementbyid, im not sure whats wrong with the variable assignemnt im trying to do, been at this since yesterday!