Passing Variables from Javascript to PHP

[cjosephson]

I know there is a snippet about this in the PHP user manual, but that isn't working for me so I've come for help.

 

I am trying to get the return value of a javascript confirm box to be passed back to php.

 

 

 <input name="delete" type="submit" class="bluebox" id="delete" value="Delete Entry" onClick="confirmDelete()" />

<script language='javascript'>
function confirmDelete() {
  var answer = confirm("Delete Entry")

}
</script>


<?php
if ($_GET['answer']) == "true") {

echo "Deleting?";


} ?>		

 

What am I doing wrong?

[drewbee]

You can't interact PHP and javascript like that. PHP is compiled, ran, and completed before javascript even hits the output.

 

However what you can do is use GET DATA

 

<script language='javascript'>

function confirmDelete()

{

    var answer = confirm("Delete Entry");

    if (answer)

    {

        location.href = 'thisfile.php?delete=answer';

    }

}

</script>

 

You have to actually reference it to another page, or the same page within post/get information.

[DeepakJ]

actually php is interpreted

[DeepakJ]

Its really cause JavaS is client sided scripting and PHP is serversided. Atleast I think thats why.

[cjosephson]

Thank you for replies, this sounds like a good solution. Unfortunately, nothing is changing when the javascrip fucntion is executed, the link in my address bar doesn't change.

[clanstyles]

I had something like this that I needed before. I did something like

 

<?php

$wid="<script>document.write(screen.width);</script>";

$hig="<script>document.write(screen.height);</script>";

?>

 

I don't know if

$answer="<script>document.write(answer);</script>";

would work too..

Works too