Simple replacement check-tree.js file that uses ASN Common Core State Standards manifest with CORS enabled to select specific standards. http://dev.sencha.com/deploy/ext-4.0.0/examples/tree/check-tree.html

check-tree.js

/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file.  Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/

Ext.require([
    'Ext.tree.*',
    'Ext.data.*',
    'Ext.window.MessageBox'
]);

Ext.onReady(function() {
  
 //Define a new 'asn' data model with certain fields from the manifest.  Full list of available fields - http://jesand.co/Y9CeRR
 Ext.define('asn', {
    extend: 'Ext.data.Model',
    fields : ['text', 'id']
 });
 
 //ASN manifest doesn't contain a field called 'checked', so let's add it on-the-fly
 asn.prototype.fields.add(new Ext.data.Field({ name: 'checked', defaultValue: false}));

 //add CORS support for ASN manifest request
 Ext.Ajax.useDefaultXhrHeader = false;
 Ext.Ajax.cors = true;
 
  var store = Ext.create('Ext.data.TreeStore', {
      model: 'asn',
      proxy: {
          type: 'ajax',
          url: 'http://s3.amazonaws.com/asnstatic/data/manifest/D10003FB.json' //ASN manifest location
      },
      sorters: [{
          property: 'leaf',
          direction: 'ASC'
      }, {
          property: 'text',
          direction: 'ASC'
      }]
  });

  var tree = Ext.create('Ext.tree.Panel', {
      store: store,
      rootVisible: false,
      useArrows: true,
      frame: true,
      title: 'Check Tree',
      renderTo: 'tree-div',
      width: 500,
      height: 250,
      dockedItems: [{
          xtype: 'toolbar',
          items: {
              text: 'Get checked nodes',
              handler: function(){
                  //get the ASN URI from checked
                  var records = tree.getView().getChecked(),
                  names = [];
                  Ext.Array.each(records, function(rec){
                      names.push(rec.get('id'));
                  });
                  Ext.MessageBox.show({
                    title: 'Selected Nodes',
                    msg: names.join('<br />'),
                    icon: Ext.MessageBox.INFO
                  });
              }
          }
      }]
  });
});