JS: widget.js

gistfile1.js

(function() {

    // Localize jQuery variable
    var jQuery;

    /******** Load jQuery if not present *********/
    if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.4.2') {
        var script_tag = document.createElement('script');
        script_tag.setAttribute("type","text/javascript");
        script_tag.setAttribute("src",
            "http://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js");
        if (script_tag.readyState) {
          script_tag.onreadystatechange = function () { // For old versions of IE
              if (this.readyState == 'complete' || this.readyState == 'loaded') {
                  scriptLoadHandler();
              }
          };
        } else {
          script_tag.onload = scriptLoadHandler;
        }
        // Try to find the head, otherwise default to the documentElement
        (document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
    } else {
        // The jQuery version on the window is the one we want to use
        jQuery = window.jQuery;
        main();
    }

    /******** Called once jQuery has loaded ******/
    function scriptLoadHandler() {
        // Restore $ and window.jQuery to their previous values and store the
        // new jQuery in our local jQuery variable
        jQuery = window.jQuery.noConflict(true);
        // Call our main function
        main(); 
    }

    /******** Our main function ********/
    function main() { 
        jQuery(document).ready(function($) { 
            /******* Load CSS *******/
            var css_link = $("<link>", { 
                rel: "stylesheet", 
                type: "text/css", 
                href: "style.css" 
            });
            css_link.appendTo('head');          

            /******* Load HTML *******/
            var jsonp_url = "http://www.bondarewicz.com/js-widget/jsonp.php?callback=?";
          
            $.getJSON(jsonp_url, 'html_element=form', function(data) {
              $('#example-widget-container').html("This data comes from another server: " + data.html_element);
            });
        });
      jQuery('body').append('<div id="example-widget-container"></div>');
    }

    })(); // We call our anonymous function immediately