Unable to load jquery-ui dynamically - a is undefined

Question

So I have trying to build a embeddable widget that will play nicely w/others when it is loaded on an external website. Since I have never had to do this before I was following a great tutorial by Alex Marandon on how to build a web widget. I am able to load jquery (1.7.1), however, whenever I attempt to load jquery-ui (1.8.16) - from w/in the JS - I get a JS error that says "a is undefined". The following fiddle reproduces what I am seeing:

http://jsfiddle.net/malonso/qfBLx/

Now if I combine the jquery and jqueryui into a single file and put it on my server it works fine but that is less than optimal for a variety of reasons and I would like to avoid that if possible. The other strange thing is that if I attempt to load any other JS file in place of jqueryui, the file loads just fine; clearly I am missing something there.

Thanks in advance.

Update:

The fiddle contains all the relevant code but I will include the javascript portion below. The code waits until the browser has loaded jquery and then it makes a request to load jqueryui. I actually use jquery to print debug statements before and after the request to load jqueryui, so jquery is definitely "available". Just for giggles I tried delaying the loading of jqueryui until 3 seconds after the browser determine jquery is loaded and I get the same issue.

(function() {

// Localize jQuery variable
var jQuery;

/******** Load jQuery if not present *********/
if (window.jQuery === undefined || window.jQuery.fn.jquery !== '1.7.1') {
    var script_tag = document.createElement('script');
    script_tag.setAttribute("type","text/javascript");
    script_tag.setAttribute("src","http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/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($) {
        loadJS();

    });
}

function loadJS(){
    jQuery('#debug').append("About to load jquery-ui<br>");
    var script_tag = document.createElement('script');
    script_tag.setAttribute("type","text/javascript");
    script_tag.setAttribute("src","http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js");
    (document.getElementsByTagName("head")[0] || document.documentElement).appendChild(script_tag);
    jQuery('#debug').append("Request made to load jquery-ui<br>");
}


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

Tony Carbone · Accepted Answer · 2013-12-23 01:29:57Z

1

This is a bit of a late response, but I was coming across this error when dynamically inserting JQuery UI 1.8.16 into a page with jQuery 1.9

The problem was that the "$.browser" function has been deprecated.

Switching to Jquery V1.7.2 fixed my problem completely. Hope this helps someone else

answered Dec 23, 2013 at 1:29

Tony Carbone

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Comments

Community · Accepted Answer · 2017-05-23 11:48:47Z

If you believe the problem is that the script tag is not being added I found this a bit tricky but below is what I am using and it seems to be working though I am not serving the js just reading from file, also I have not tried with jquery-ui. as always mileage may vary

// add additional javascripts
$.fn.addJavascript = function(src) {
    if (!$('script[src="' + src + '"]').exists()) {
        var script   = document.createElement('script');
        script.setAttribute('type', 'text/javascript');
        script.setAttribute('src', src);
        document.getElementsByTagName("head")[0].appendChild(script);
    }
};

// .exists() helper
$.fn.exists = function() {
    return this.length !== 0;
}; 

// usage
var d = ["lib/json2.js", "lib/jquery-ui.js"];
for (var i=0; i < d.length; i++) {
    $.fn.addJavascript(d[i]);
}

I had some success adding jQuery-ui functions within the plugin I was writing using such doing it like such $(window).load(function() { foo.draggable }); I would have already had jQuery loaded though and the 'chain of events' would have gone like

page load with jQuery
jQuery dom ready call plugin on selection
selection for each instantiate new plugin
plugin init()
- add dependencies if not exists
- render plugin
- window.load -> bind jquery-ui functionality

Having played with this for a bit I have finally come up with a slightly better dependency adding function though I need to look at checking for existence, also you may wish too look at this question

function addDependencies(args) {
  var head = document.getElementsByTagName('head')[0];
  for (var i=0; i < args.length; i++) {
    var src = args[i];
    var isCss = src.match(/.+\.css$/i);
    var isJs = src.match(/.+\.js$/i);

    if (isCss) {
      if (document.createStyleSheet) {
        document.createStyleSheet(src);
      } else {
        var style = document.createElement('link');
        style.type = 'text/css';
        style.rel = 'stylesheet';
        style.href = src;
        head.appendChild(style);
      }
    } else if (isJs) {
      var script = document.createElement('script');
      script.type = 'text/javascript';
      script.src = src;
      // script.onload = ;
      head.appendChild(script);
    }
  }
  return true;
}

(function() {
  var dependencies = [
    "http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js",
    "http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js",
    "http://ajax.googleapis.com/ajax/libs/yui/2.8.0r4/build/reset-fonts-grids/reset-fonts-grids.css"
  ];

  addDependencies(dependencies);

  $(document).ready(function() {
    $('#foo').draggable();
  });

})();

here is a demo

Thanks Tom, I appreciate the quick response. I would tend to disagree that it isn't relevant to the problem. The problem is that loading jqueryui is causing an error. I am not even trying to do anything w/it in the code I attached other than simply loading it.

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