Fetch variable in javascript from a link - php

Question

I am trying to get a PHP variable to send through javascript and I am having trouble. I am using a jQuery popup I found online and when a user clicks an item, I need that item_id variable to be fetchable in the popup where I want to add a form.
My PHP section.
<a href="#?w=500&item_id='.$stock['id'].'" rel="popup1" class="poplight">
and the Javascript.
$(document).ready(function(){
//When you click on a link with class of poplight and the href starts with a #
$('a.poplight[href^=#]').click(function() {
var popID = $(this).attr('rel'); //Get Popup Name
var popURL = $(this).attr('href'); //Get Popup href to define size
//Pull Query & Variables from href URL
var query= popURL.split('?');
var dim= query[1].split('&');
var popWidth = dim[0].split('=')[1]; //Gets the first query string value
var itemID = dim[0].split('=')[2]; //Gets the second query string value
//Fade in the Popup and add close button
$('#' + popID).fadeIn().css({ 'width': Number( popWidth ) }).prepend('<img src="/layout/close_pop.png" class="btn_close" title="Close Window" alt="Close" />');
//Define margin for center alignment (vertical + horizontal) - we add 80 to the height/width to accomodate for the padding + border width defined in the css
var popMargTop = ($('#' + popID).height() + 80) / 2;
var popMargLeft = ($('#' + popID).width() + 80) / 2;
document.getElementById('popup1').innerHtml = itemID;
//Apply Margin to Popup
$('#' + popID).css({
'margin-top' : -popMargTop,
'margin-left' : -popMargLeft
});
//Fade in Background
$('body').append('<div id="fade"></div>'); //Add the fade layer to bottom of the body tag.
$('#fade').css({'filter' : 'alpha(opacity=80)'}).fadeIn(); //Fade in the fade layer
return false;
});
//Close Popups and Fade Layer
$('a.close, #fade').live('click', function() { //When clicking on the close or fade layer...
$('#fade , .popup_block').fadeOut(function() {
$('#fade, a.close').remove();
}); //fade them both out
return false;
});
});
I added what I thought you work, but it does not var itemID = dim[0].split('=')[2]; //Gets the second query string value and document.getElementById('popup1').innerHtml = itemID;

Answer 1

Use a sophisticated function to retrieve URL query parameters:
function getParameterByName(name, locationObject)
{
name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
var regexS = "[\\?&]" + name + "=([^&#]*)";
var regex = new RegExp(regexS);
var results = regex.exec(locationObject.search);
if(results == null)
return "";
else
return decodeURIComponent(results[1].replace(/\+/g, " "));
}
[Adopted from here]
Simply call it like so:
getParameterByName('item_id', someLink);
Working Fiddle: http://jsfiddle.net/ADpYT/

Answer 2

You have a simple oversight in your original code ..
When you obtain your dim variable, you get an array with 2 items split at & . In the above code you get ["w=500", "item_id=some_value"] .So in order to get the itemID you have to use dim[1].
var itemID=dim[1].split('=')[1];