Unfortunately, dijit.Tree has some built-in caching mechanisms that make “refreshing” nodes rather difficult. See comments here: http://dojocampus.org/content/2008/06/04/refreshing-a-data-store/

Here’s what I ran in firebug using dojo 1.0.2 off of the AOL CDN:

dojo.declare(”Person”, null, {
constructor: function(name, petName) {
this.name = name;
this.getPrivateName = function() {
return petName;
}
},
getName: function() {
return this.name;
},
getLocation: function() {
return location;
}
});

person1 = new Person(”Mr. First Person”, “cuddles”);

function init() {
var location = “In the init function”;
console.log(”init: “, location );
window.locationGetter1 = function() { return location; };
window.locationGetter2 = dojo.hitch(person1, person1.getLocation);
console.log( “init:”, locationGetter2() );
}
init();
console.log( location );
console.log( locationGetter1() );
console.log(locationGetter2());

P.S. binspaul, datastore.close() function is not yet available, need to wait till dojo 1.2 for that.

console.info(”Tree store (before) : “);
console.info(_this.tree.store);

// Create a new store.
newStore = new dojo.data.ItemFileWriteStore({url: ‘folders.html?hidValAction=getjsondata’, jsId: “newFolderStore”});
newStore.fetch();
_this.tree.store = newStore;

console.info(”Tree store (after) : “);
console.info(_this.tree.store);

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The output obtained is :

Tree store (before) :
Object _arrayOfAllItems=[18] _arrayOfTopLevelItems=[18]

GET ………/folders.html?hidValAction=getjsondata

Tree store (after) :
Object _arrayOfAllItems=[0] _arrayOfTopLevelItems=[0]

Best regards,
Binu Paul

METHOD 1 :

var _this = this;
newStore = new dojo.data.ItemFileWriteStore({url: ‘test.html?hidValAction=getjsondata’, jsId: “datStore”});
newStore.fetch();
_this.tree.model.store.close();
_this.tree.store = newStore;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

METHOD 2 :

var _this = this;

_this.tree.model.store = new dojo.data.ItemFileWriteStore({url: _this.tree.model.store.url});

_this.tree.model.store.fetch();

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The store is getting populated. But it is not getting reflected in the tree.

Best regards,
Binu Paul

var new_store = new dojo.data.ItemFileReadStore({url: ‘poptarts.txt’});
new_store.fetch();

var myTree = dijit.byId(”tree”);

myTree.store = new_store;

dojo.forEach(myTree._openedItemIds, function (item) {
n = myTree._itemNodeMap(item);
n.state = “UNCHECKED”
n.isExpanded = false;
n.expand();
});