JavaScript Forum

**tableman** · 09-28-2006, 07:02 PM

This script prepopulates select box, state, but not radio button, tobacco.

Code:

<script language="javascript" type="text/javascript">

function prepop()
{
document.long_form.state.value="<?php echo $_SESSION['state']; ?>";
document.long_form.tobacco.value="<?php echo $_SESSION['tobacco']; ?>";
}
window.onload=prepop;

</script>

The value for tobacco, yes or no, shows on the page with view source, so it got to the page, but I can't find how to address a radio button so the value is preselected., and I'm out of ideas.

Any suggestions?

**funkdaddu** · 09-28-2006, 09:44 PM

Why use JS for this? Why not just use PHP to add the "checked" attribute?

**boredportal** · 09-28-2006, 10:01 PM

if you know javascript, why NOT use it?
why learn php for one thing?

**tableman** · 09-28-2006, 10:23 PM

PHP could be used, funkdaddu, but the same question arises for me in PHP, as boredportal indicates.

It does not matter which I use. I just need to figure it out.

**tableman** · 09-29-2006, 04:28 AM

So I figured it out, with a little help elsewhere.

Here is the javascript solution for prepopulating a radio button that receives its value from a php session (substitute input code accordingly for any other source):

Code:

var tob; 
var tabac="<?php echo $_SESSION['tobacco']; ?>"; 
{
if (tabac=="yes") 
{tob="0"} 
else if (tabac=="no")
{tob="1"} 
document.long_form.tobacco[tob].checked = true;

This line is then not needed for the radio button:

Code:

document.long_form.tobacco.value="<?php echo $_SESSION['tobacco']; ?>";

It would be nice to know how to do this in php also, but this javascript works.

**funkdaddu** · 10-01-2006, 10:46 PM

You used PHP in your example so I figured you were fluent in it... but this is how you would do it with pure PHP:

HTML Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

	<head>
		<meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
		<title>Untitled Page</title>
	</head>

	<body bgcolor="#ffffff">
		<form id="FormName" action="" method="get" name="FormName">
			Tobacco: <input type="radio" name="Tobacco" value="Yes" <?php if ($_SESSION['tobacco'] == 'yes') { echo 'checked'; } ?>>Yes  <input type="radio" name="Tobacco" value="No" <?php if ($_SESSION['tobacco'] == 'no') { echo 'checked'; } ?>>No
		</form>
		<p></p>
	</body>

</html>

**seomumbai** · 10-19-2006, 03:42 AM

You can change the checked status of the radio button to true.
Document.long_form.radiobutton.chaecked = true.