Changes:

1. get("id") instead getId() (i need this)
2. refactoring: remove extra loop in getState(), remove checking stateful property and other
3. tested with ExtJs 6

Plugin for Sencha ExtJS 5.1 for saving Ext.tree.Panel (treepanel) folders collapsed / expanded state.

How to use:

First you need init state provider:

Ext.state.Manager.setProvider(new Ext.state.CookieProvider({
  expires: new Date(new Date().getTime()+(1000*60*60*24*7)) //7 days from now
}));

Your tree view:

Ext.define('app.view.Tree', {
  extend:'Ext.tree.Panel',
  title: 'Stateful tree',

  viewConfig: {

    stateful: true,   // Require
    stateId: 'my_id', //Require, your tree id 
    
    plugins:  [ Ext.create('Ext.ux.TreeStateful') ] // TreeStateful plugin
  },
  store: 'productsTreeStore' // store id
});

Known issues:

• Report if you find any issues