ExtJS 4.1 treepanel - expanding a treepanel is resulting in duplicate records

Question

I am using ExtJS 4.1. I have a TreePanel which I bind to one of two TreeStore. After I rebind a store & expand collapse nodes, records are getting duplicate & I see error Uncaught TypeError: Cannot read property 'internalId' of undefined

Another issue is, I am only able to bind store once. When i call treePanel.setRootNode() second time it does not work (irrespective of whether I expand the nodes or not).

Look at this fiddle

Here is the code:

var sportsStore = Ext.create('Ext.data.TreeStore', {
  root: {
    expanded: true,
    id: 133,
    children: [{
        text: "Audi",
        id: 1,
        leaf: true
      },
      {
        text: "sports cars",
        expanded: true,
        id: 2,
        children: [{
            id: 3,
            text: "Porsche",
            leaf: true
          },
          {
            text: "Mustang",
            id: 4,
            leaf: true
          }
        ]
      },
      {
        text: "Jaguar",
        id: 5,
        leaf: true
      }
    ]
  }
});


var carStore = Ext.create('Ext.data.TreeStore', {
  root: {
    expanded: true,
    id: 1444,
    children: [{
        id: 6,
        text: "Toyota",
        leaf: true
      },
      {
        text: "cars",
        id: 7,
        expanded: true,
        children: [{
            id: 8,
            text: "honda",
            leaf: true
          },
          {
            text: "Nissan",
            id: 9,
            leaf: true
          }
        ]
      },
      {
        text: "Kia",
        id: 10,
        leaf: true
      }
    ]
  }
});



Ext.create('Ext.panel.Panel', {
  title: 'Car Simple Tree',
  width: 300,
  height: 450,

  renderTo: Ext.getBody(),

  items: [{
      xtype: 'button',
      text: 'sports',
      handler: function() {
        alert('You clicked the sports button!');
        var t = Ext.getCmp('tp');

        t.setRootNode(sportsStore.getRootNode());
      }
    },

    {
      xtype: 'button',
      text: 'car',
      handler: function() {
        alert('You clicked the car button!');
        var t = Ext.getCmp('tp');

        t.setRootNode(carStore.getRootNode());
      }
    },
    {

      xtype: 'treepanel',
      id: 'tp',
      store: sportsStore,
      rootVisible: false,
      lines: true
    }
  ]


});

Answer 1

Just for the record you know your problem is solved in one line in 6.0 with just calling setStore() and passing as parameter the store you want right?

Here is a demo of this working in 6.0.

I played with this for a good amount of time and although my Sencha is somewhat rusty (used to be a big fan back in the day) I managed to get something working.

Now it might not be your cup of tea but it does exactly what you want ... you change the stores and expanding/collapsing works etc. The trick is I dynamically re-create the tree on every store change and set the store as the default store to that new tree. The decommissioned trees are removed by Ext.destroy etc.

Here is that Ext 4.1 working example in Fiddle

And here is the code for your reference:

Ext.define('Thing', {
  extend: 'Ext.data.Model',
  fields: [{
    name: 'id',
    type: 'int'
  }, {
    name: 'text',
    type: 'string'
  }]
});

var sportsStore = Ext.create('Ext.data.TreeStore', {
  model: 'Thing',
  storeId: 'sportsStore',
  clearOnLoad: true,
  root: {
    expanded: true,
    id: 133,
    children: [{
      text: "Audi",
      id: 1,
      leaf: true
    }, {
      text: "sports cars",
      expanded: true,
      id: 2,
      children: [{
        id: 3,
        text: "Porsche",
        leaf: true
      }, {
        text: "Mustang",
        id: 4,
        leaf: true
      }]
    }, {
      text: "Jaguar",
      id: 5,
      leaf: true
    }]
  }
});
var carStore = Ext.create('Ext.data.TreeStore', {
  model: 'Thing',
  storeId: 'carStore',
  clearOnLoad: true,
  root: {
    expanded: true,
    id: 1444,
    children: [{
      id: 6,
      text: "Toyota",
      leaf: true
    }, {
      text: "cars",
      id: 7,
      expanded: true,
      children: [{
        id: 8,
        text: "honda",
        leaf: true
      }, {
        text: "Nissan",
        id: 9,
        leaf: true
      }]
    }, {
      text: "Kia",
      id: 10,
      leaf: true
    }]
  }
});
// This function does the magic by removing/then destroying the old tree and 
// adding the newly created one with default new store setup
function setupTree(storeName) {
  var pnl = Ext.getCmp('pnl');
  var treePanel = Ext.getCmp('tp')
  if (treePanel) {
    pnl.remove(treePanel)
    Ext.destroy(treePanel)
  }
  pnl.add(new Ext.create('Ext.tree.Panel', {
    id: 'tp',
    autoRender: true,
    rootVisible: false,
    store: storeName,
    animate: false,
    lines: true
  }))
}

Ext.create('Ext.panel.Panel', {
  id: 'pnl',
  title: 'Car Simple Tree',
  width: 300,
  height: 450,
  renderTo: Ext.getBody('#canvas'),
  items: [{
    xtype: 'button',
    text: 'sports',
    handler: function() {
      setupTree('sportsStore')
    }
  }, {
    xtype: 'button',
    text: 'car',
    handler: function() {
      setupTree('carStore')
    }
  }],
  listeners: {
    afterrender: function(self) {
      setupTree('sportsStore')
    }
  }
});

I also added ids to the stored as well as defined a model for the stores just to be more close to best practices etc.

The thing that makes this move is the setupTree function which looks for a tree with certain id, if it finds it cleans it and then creates a new one with a default store the one we clicked on.

Hope this helps.