How to update dojo tree data dynamically

Question

I would like to know how ot update the data of the dojo.dijit.tree component dynamically. At the moment I'm creating the tree using dojo.data.ItemFileReadStore and dijit.tree.ForestStoreModel. Once I create the tree, I would like to reload it periodically with new JSON data.

This is how I create the tree at the moment:

<div dojoType="dojo.data.ItemFileReadStore" jsId="myStore" url=getJSONResult></div>

<div dojoType="dijit.tree.ForestStoreModel" jsId="myModel" store="myStore" query="{type:'cat'}" rootId="myRoot" rootLabel="Data" childrenAttrs="children"></div>

<div dojoType="dijit.Tree" model="myModel" labelAttr="sname" label="Data" />

Thanks in advance.

Answer 1

Explicitly you "can't", but that doesn't mean you can't hack things to pieces and die trying.

refreshTree : function(){
    dijit.byId("myTree").dndController.selectNone(); // As per the answer below     
    // Credit to this discussion: http://mail.dojotoolkit.org/pipermail/dojo-interest/2010-April/045180.html
    // Close the store (So that the store will do a new fetch()).
    dijit.byId("myTree").model.store.clearOnClose = true;
    dijit.byId("myTree").model.store.close();

    // Completely delete every node from the dijit.Tree     
    dijit.byId("myTree")._itemNodesMap = {};
    dijit.byId("myTree").rootNode.state = "UNCHECKED";
    dijit.byId("myTree").model.root.children = null;

    // Destroy the widget
    dijit.byId("myTree").rootNode.destroyRecursive();

    // Recreate the model, (with the model again)
    dijit.byId("myTree").model.constructor(dijit.byId("myTree").model)

    // Rebuild the tree
    dijit.byId("myTree").postMixInProperties();
    dijit.byId("myTree")._load();

},

This will refresh your Tree.