Execute PHP using JavaScript onclick submit

Question

How do I execute PHP using a JavaScript onclick button? I can get the form to submit, but the PHP does not get executed. I assume it's because if(isset($_POST['form']))

Here is the PHP I want to execute:

if(isset($_POST['form']))
{
    if(!isset($error))
    {
        $database->query('UPDATE table SET field = :value WHERE id = :id', array(':field' => $value, ':id' => $id));
    }
}

Here is my button that is BEFORE my <form> tag:

<div onclick="javascript: $(\'#form\').submit();">Update</div>

And of course my <form> tag looks something like this:

<form name="form" id="form" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
  <select name="value">
    <option value="1">Value1</option>
    <option value="2">Value2</option>
    <option value="3">Value3</option>
  </select>
</form>

I can get the form to submit, but the PHP does not get executed. I assume it's because if(isset($_POST['form'])) — Draven
– Draven, Commented Aug 2, 2012 at 2:01

Trott · Accepted Answer · 2012-08-02 01:57:08Z

1

PHP generally runs server side. JavaScript generally runs in the browser. You need to put the PHP in the file blah.php on the server.

answered Aug 2, 2012 at 1:57

Trott

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3 Comments

Draven Over a year ago

I can get the form to submit, but the PHP does not get executed. I assume it's because if(isset($_POST['form']))

Trott Over a year ago

Change $_POST['form'] to $_POST['foo'] where foo is the name attribute of the input element you care about.

Draven Over a year ago

Ah, of course. How stupid of me. Since I might have more than one input field in the form I was hoping to use the name=form in the <form> tag. But your suggestion will work.

Kurt · Accepted Answer · 2012-08-02 02:13:58Z

0

I doubt you have a $_POST['form'] variable. $_POST will contain all of your form element's id's like email, phone, name, etc... $_POST['email'], but would likely not contain a general 'form' key.

I would use if (isset($_POST))

edited Aug 2, 2012 at 2:13

Kurt

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answered Aug 2, 2012 at 2:06

michael

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1 Comment

Draven Over a year ago

I thought about using that but I have two forms on the page.

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