Bookmarklet to turn <select>s into <select²>s

select2.bookmarklet.js

javascript:void%20function(){function%20e(e,n){var%20o=document.createElement(%22script%22);o.onload=function(){console.log(e+%22%20loaded%22),n()},o.onerror=function(o){console.log(e+%22%20errored%22,o),n(o)},o.src=e,document.body.appendChild(o)}function%20n(e,n){c.link=document.createElement(%22link%22),c.link.onload=function(){n()},c.link.onerror=function(e){n(e)},c.link.href=e,c.link.rel=%22stylesheet%22,c.link.type=%22text/css%22,document.body.appendChild(c.link)}function%20o(n){return%20window.jquery||window.$%3Fn():void%20e(c.jquery,n)}function%20t(){n(c.css,function(n){return%20n%3Fconsole.log(%22err%20loading%20css%22,n):void%20o(function(n){return%20n%3Fconsole.log(%22err%20loading%20jquery%22,n):void%20e(c.js,function(e){if(e)return%20console.log(%22err%20loading%20select2%20js%22,e);var%20n=[].slice.call(document.querySelectorAll(%22select%22));n.forEach(function(e){jQuery(e).select2({dropdownAutoWidth:!0})})})})})}var%20c={js:%22https://cdn.rawgit.com/select2/select2/3.5.4/select2.min.js%22,css:%22https://cdn.rawgit.com/select2/select2/3.5.4/select2.css%22,jquery:%22https://code.jquery.com/jquery-2.1.4.min.js%22};t()}();

select2.js

var select2 = {
  js: 'https://cdn.rawgit.com/select2/select2/3.5.4/select2.min.js',
  css: 'https://cdn.rawgit.com/select2/select2/3.5.4/select2.css',
  jquery: 'https://code.jquery.com/jquery-2.1.4.min.js'
};


function loadScript (src, callback) {
  var script = document.createElement('script');
  script.onload = function() {
    console.log(src + ' loaded');
    callback();
  };

  script.onerror = function(err) {
    console.log(src + ' errored', err);
    callback(err);
  }

  script.src = src;
  document.body.appendChild(script);
}

function loadCss(src, callback) {
  select2.link = document.createElement('link');
  select2.link.onload = function() {
    callback();
  };

  select2.link.onerror = function(err) {
    callback(err);
  };

  select2.link.href = src;
  select2.link.rel = 'stylesheet';
  select2.link.type = 'text/css';

  document.body.appendChild(select2.link);
}

function loadJQuery(callback) {
  if (window.jquery || window.$) {
    return callback();
  }

  loadScript(select2.jquery, callback);
}

function loadResources() {
  loadCss(select2.css, function(err) {
    if (err) {
      return console.log('err loading css', err);
    }

    loadJQuery(function(err2) {
      if (err2) {
        return console.log('err loading jquery', err2);
      }

      loadScript(select2.js, function(err3) {
        if (err3) {
          return console.log('err loading select2 js', err3);
        }

        var selects = [].slice.call(document.querySelectorAll('select'))

        selects.forEach(function(el) {
          jQuery(el).select2({dropdownAutoWidth: true});
        });
      });
    })
  });
  
}

loadResources();