Change PHP variable values using drop down menu

Question

I wondering if any know way to change values of variable using option drop-down list ??

php script is:

<?php $searchBoxfruit = "Red"; require_once('includes/search_box.php'); ?>

and option list

<option value="Type">Type</option>
            <option value="Red">Red</option>
            <option value="Green">Green</option>
            <option value="Gray">Gray</option> 
            </select>

so basicly when user selected green option in drop down menu, $searchBoxfruit values must change to Green.

I try to fix this problem with this code:

$searchBoxfruit = "";

if (isset($_GET['0'])):  
    $searchBoxfruit = "Red";
elseif (isset($_GET['1'])):
   $searchBoxfruit = "Blue";
elseif (isset($_GET['2'])):  
    $searchBoxfruity = "White";
else:  (isset($_GET['3'])):
    $searchBoxfruit = "Black";  
endif;

php $searchBoxfruit = ""; require_once('includes/search_box.php');

but still it s does not work !!

allen213 · Accepted Answer · 2012-07-11 09:22:34Z

2

Php is always interpreted before sending content to client. HTML is part of that content. Once you get to see HTML elements, such as your dropdown list, you can't tell PHP to modify an exisiting variable.

The best thing to do is to use a form whichs sends GET or POST data to a php page.

edited Jul 11, 2012 at 9:22

allen213

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answered Jul 11, 2012 at 9:19

Salepate

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Comments

Shubham · Accepted Answer · 2012-07-11 09:20:13Z

0

Thats the quite basic part of form processing. Like,

If your "<select>" is named fruit and the form is submitted.

$_POST['fruit'] shall give the value.

answered Jul 11, 2012 at 9:20

Shubham

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1 Comment

Nasan Ert Over a year ago

Thanks, but can you provide more deatlis?

Amit Sharma · Accepted Answer · 2012-07-11 11:08:48Z

0

<?php
<form action="" method="post" id="kid">
<select name="op">
<option value="Pink">Pink</option>
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Gray">Gray</option>
</select>

<input type="submit" value="SUBMIT" name='but'>
</form>
<?php
<br>if( $_POST ) <br>{ <br> var_dump( $_POST ); <br>} <br>

?>

I think u should study this code a bit

answered Jul 11, 2012 at 11:08

community wiki

Amit Sharma

Comments

Gerald Versluis · Accepted Answer · 2012-07-11 09:26:50Z

-1

This can't be done with purely HTML/PHP.

You could trigger a form post when the users selects another option, or, better yet, do an AJAX call to set the variable.

But why would you want to do it real time?

Just get the value when the form is submitted in the $_POST['nameofyoucontrol'] variable.

edited Jul 11, 2012 at 9:26

answered Jul 11, 2012 at 9:20

Gerald Versluis

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