Ajax Jquery variable with php

Question

Is there any way I can use json and jquery to retrieve a variable and use it?

Ie what I want to do is use jquery to call a php script, query mysql and then return this variable to use on my original page.

ie

$( "#result" ).load( "query.php");

and then be able to echo this result on my calling page.

I know that the div with the id #result will be populated with the data but I want to be able to echo it as a value so my jquery progress bar will change

$(function() {
$( "#progressbar" ).progressbar({
  value: <?php echo"$light"; ?>
});

});

Here I'm just using a php query on load but I want to have it dynamically change every 30seconds without having to refresh.

Answer 1

You could try something like this:

$.ajax("query.php").done(function(data) {
    $("#progressbar").progressbar({value: data})
});

(Untested code, but should work in principle.)