How to include a Javascript variable inside a php function?

Glen Villar

Hi! I'd like to know if there's a way I can call a javascript variable in a php function? Like for example, the code below would get the value of textbox text1 when the button is clicked. It should call the javascript function with a parameter. That javascript function calls the PHP function with a javascript variable nVal. Fuction PassNumber(nVal) { alert("<?php ShowNumber("+nVal+"); ?>"); }
Thanks.

Graham Breach

No. If you really want to get a value into Javascript from PHP without reloading the page, the way to do it is using AJAX.

GregStevens

You have to think about it this way: PHP code works with what the server "knows". Javascript code works with what the browser / client "knows". To get them to interact, you need to explicitly "pass" information back and forth between the two. For example, if you have a variable in the javascript, you can "pass" the value to the server by passing it with a GET variable, e.g.

Then, on the server side, you receive the GET variable to produce the effect that you want:

<?php

$nval = $_GET['n'];
if ($nval)
{
print('<script>alert('.$nval.');</script>');
}
?>

Contrariwise, when you have the PHP variable on the server side, you can use that to feed it to the Javascript function when rendering your onclick function:

This requires a re-load of the page, and change of URL, each time you click the button. To do it more "subtley", without a reload, you would have to use AJAX: but the principle would be the same. Pass the information between Server and Browser using calls to the PHP page with GET.

--Greg