How do i link a field in a form to previous page?

**speed1972** · 06-05-2009 05:36 PM

Is there a way so that when someone clicks on the 'book me an alarm specialist' link it will automatically fill in the trade section of the form on the page it links to. I have about 20 pages linking to the form page all coming from a different trade.

I have added this bit of code to the initial page :

<a href="http://www.elitetradesmen.com/searchtrades.php?trade=Alarm%20Specialist">Book me an alarm specialist</a>

and this bit to the form page:

<a href="http://www.elitetradesmen.com/searchtrades.php?trade=Alarm%20Specialist">Book me an alarm specialist</a>

I've clearly done something wrong as it should come up with alarm specialist in the form box but its showing some of the code. What have i done wrong?

**Four Staples** · 06-06-2009 12:39 AM

Originally Posted by speed1972

Is there a way so that when someone clicks on the 'book me an alarm specialist' link it will automatically fill in the trade section of the form on the page it links to. I have about 20 pages linking to the form page all coming from a different trade.

I have added this bit of code to the initial page :

<a href="http://www.elitetradesmen.com/searchtrades.php?trade=Alarm%20Specialist">Book me an alarm specialist</a>

and this bit to the form page:

<a href="http://www.elitetradesmen.com/searchtrades.php?trade=Alarm%20Specialist">Book me an alarm specialist</a>

I've clearly done something wrong as it should come up with alarm specialist in the form box but its showing some of the code. What have i done wrong?

Putting the variable in the URL like that only makes it available as a query string variable, it won't fill in any forms.

Where you have your input box, put this

PHP Code:


<input type="text" name="trade" value="<?php echo addslashes($_GET['trade']); ?>">

Make sure you keep the addslashes() or someone could inject content into your page.

**meral** · 06-06-2009 01:44 AM

Here is the complete code for your problem

index.php [where the link of 'Book me an alarm specialist']
-------------------------------------------------------

<html>
<body>
<p><a href="http://www.elitetradesmen.com/searchtrades.php?trade=Alarm%20Specialist">Book me an alarm specialist</a></p>
</body>
</html>

searchtrades.php [where the link redirect after clicking]
------------------------------------------------------------
<?php

$tradeval = addslashes($_REQUEST["trade"]);
?>

<html>
<body>
<form action="" method="post">
<input type="text" name="trade" id="trade" value="<?=$tradeval?>" />
<input type="submit" name="submit" value="submit" />
</form>
</body>
</html>

**Four Staples** · 06-06-2009 02:28 AM

Note that for Meral's to work, your server will need to have PHP shortt ags enabled. If not, use my PHP from the other post.

**speed1972** · 06-06-2009 03:37 AM

Sorry not sure where i paste Merals code within my code,

I've put

<input type="text" name="trade" value="<?php echo addslashes($_GET['trade']); ?>">

into my code and i'm still having the same problem

http://www.elitetradesmen.com/alarmspecialists.html

then click on the book alarm specialist link, doesn't fill in the correct info in the trade field of the form.

**Four Staples** · 06-06-2009 01:47 PM

Originally Posted by speed1972

Sorry not sure where i paste Merals code within my code,

I've put

<input type="text" name="trade" value="<?php echo addslashes($_GET['trade']); ?>">

into my code and i'm still having the same problem

http://www.elitetradesmen.com/alarmspecialists.html

then click on the book alarm specialist link, doesn't fill in the correct info in the trade field of the form.

Looks like your server doesn't have PHP available. Try this instead...

Put this in the <head>

Code:

<script type="text/javascript">
function get(variable) {
	var query = window.location.search.substring(1);
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
		if (pair[0] == variable) {
			return pair[1];
		}
	}
}
window.onload = function() {
var trade = document.getElementById('trade');
if(trade.value == '') {
trade.value = unescape(get('trade'));
}
}
</script>

(got the function it from http://snipplr.com/view/623/get-querystring-variable/ )

And give the trade input an ID of 'trade', and remove the value:

Code:

<input type="text" name="trade" id="trade">

And rename the page to .html instead of .php.

**speed1972** · 06-06-2009 02:26 PM

Ok not sure where to paste your code, here is my head code:

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<title>Elite Tradesmen of Southport & surrounding areas</title>
<link rel="stylesheet" href="style.css" type="text/css" charset="utf-8" />

</head>

**Four Staples** · 06-06-2009 03:33 PM

Just put it anywhere in between <head> and </head>:

Code:

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<title>Elite Tradesmen of Southport &amp; surrounding areas</title>
<link rel="stylesheet" href="style.css" type="text/css" charset="utf-8" />
<script type="text/javascript">
function get(variable) {
	var query = window.location.search.substring(1);
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
		if (pair[0] == variable) {
			return pair[1];
		}
	}
}
window.onload = function() {
var trade = document.getElementById('trade');
if(trade.value == '') {
trade.value = unescape(get('trade'));
}
}
</script>
</head>

**speed1972** · 06-06-2009 06:18 PM

Thanks for all the help, managed to get it working exactly as you said.

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