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('<a href="#" class="close"><img src="/layout/close_pop.png" class="btn_close" title="Close Window" alt="Close" /></a>');

        //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/