AJAX

Onclick to pass a variable to a PHP script

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Join Date: Jun 2008

Posts: 11

Reputation: mgt is an unknown quantity at this point

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mgt

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Newbie Poster

Onclick to pass a variable to a PHP script

Jun 24th, 2008

If I have the following code:

<form>
.
.
.
<select id="lstOtherStuff" multiple="multiple" size="6" style="width:200px;">
</select>
</form>

and I need to pass the variable "1stOtherStuff" (which is an element in an array) to a PHP script, how do I do that?

If I use the following code, I can access the file "welcome.php" (where I'd run a MYSQL script to query a value from a database):

<form action="welcome.php" method="post">

Would there be another way to access this file, "welcome.php"?

Or can I put the PHP script immediately after the Select script?

I would like to also use an "onclick" command to initiate the action. So the user would press a button, after making a selection (the selection would then be stored in the variable
"1stOtherStuff"). The selected value would then be sent to the PHP script and the PHP script would "echo" the value back.

The main question I have though is how do I pass the variable, "1stOtherStuff", to the PHP/MySQL script...

Your help would be appreciated!

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Join Date: Nov 2007

Posts: 3,809

Reputation: nav33n is a jewel in the rough

Solved Threads: 341

nav33n

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Senior Poster

Re: Onclick to pass a variable to a PHP script

Jun 24th, 2008

•

and I need to pass the variable "1stOtherStuff" (which is an element in an array) to a PHP script, how do I do that?

Have an onchange event for select tag. Submit the page in onchange event. When the form is submitted, you can access the value of the 1stOtherStuff this way.
$select_value = $_REQUEST['1stOtherStuff']; Here is a simple example.

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
<?php
$selected_value = $_REQUEST['select'];
echo "Selected value is ". $selected_value;
?>
<html>
<body>
<form name="form1" method="post" action="onchange.php">
<select name="select" onchange="javascript: document.form1.submit();">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type="button" name="button" value="Click me too!">
</form>
</body>
</html>
<?php
$selected_value = $_REQUEST['select'];
echo "Selected value is ". $selected_value;
?>
<html>
<body>
<form name="form1" method="post" action="onchange.php">
<select name="select" onchange="javascript<b></b>: document.form1.submit();">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type="button" name="button" value="Click me too!">
</form>
</body>
</html>

If you don't use onchange event, then you can use a submit button. When the button is clicked, the value of select tag is passed to the calling script.

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
<?php
if(isset($_REQUEST['submit'])) {
$selected_value = $_REQUEST['select'];
echo "Selected value is ". $selected_value;
}
?>
<html>
<body>
<form name="form1" method="post" action="onchange.php">
<select name="select">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>
<?php
if(isset($_REQUEST['submit'])) {
$selected_value = $_REQUEST['select'];
echo "Selected value is ". $selected_value;
}
?>
<html>
<body>
<form name="form1" method="post" action="onchange.php">
<select name="select">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>

If you still have any doubts, let us know

Last edited by nav33n; Jun 24th, 2008 at 2:09 pm.

Ignorance is definitely not bliss!

*PM asking for help will be ignored*

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Join Date: Jun 2006

Posts: 7,726

Reputation: ~s.o.s~ has much to be proud of

Solved Threads: 487

~s.o.s~

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Failure as a human

Re: Onclick to pass a variable to a PHP script

Jun 24th, 2008

@mgt:

Don't create multiple threads for the same topic. It ends up wasting the time of people who reply to those threads thinking there was no reply given.

I don't accept change; I don't deserve to live.

Sacrifice is a painful, pure and beautiful thing.