Links to Forms

[jwasho]

So I'm new to PHP, but i'm picking it up fairly quickly.  What I'm trying to do (and frankly have absolutly no idea how) is to have a page with a bunch of links and each links to the same form, but there's a field in the form for a link ID number and i want the client to be able to fill in that number themselves, OR FOR THE LINK THEY CLICKED TO AUTOMATICALLY FILL IN THE ID NUMBER.

 

 

I have a php form right now to take care of the first part, but like i said no idea how to do the automatic part.

 

thanks for the help

[p2grace]

The link would have a get variable at the end of it, then just grab that get variable on the form and set it on the id value.

[jamesnes]

You can access variables passed via a URL using the $_GET variable.

 

If you want to automatically get an input field to take on a value, you could do something like:

echo "<input type=\"text\" value=\"", $_GET['variable1'], "\" />";

 

However, you shouldn't ever trust user input, and this data should be validated before doing something like that.

 

A possible way to validate the data (if it's numeric):

if (isset($_GET['variable1']) && is_numeric($_GET['variable1']))
{
 $myVariable = $_GET['variable1'];
}
else
{
 $myVariable = <some_default_value>;
}

/* Code to show the form field goes here */

[jwasho]

Ok great.  Thanks I'm going to try all of this and i'm sure i'll have more questions.

[jwasho]

ok so this is the code i have for the link:

 

To sign up for this course, click <a href="cpr1form.php" variable="variable1">here</a> ...

 

 

and then in the form code:

 

Course ID Number: <input name="cid" type="text" value="", $_GET[variable1] />

 

did I understand that right?

[wrathican]

sorry to say but that is completely wrong. there is not such 'variable' html tag

 

Read this, it will give you a good understanding of what is going on in the post by jamesnes

 

http://www.w3schools.com/PHP/php_get.asp