Ext.tree.TreeLoader is not a constructor error

I'm new to Extjs4.In Extjs4 loader not working when i use loader: new Ext.tree.TreeLoader() . it showing the error like "Ext.tree.TreeLoader is not a constructor". it works fine in extjs older versions. Please help me. Than开发者_如何学运维ks in advance

In extjs 4 the component Ext.tree.TreeLoader ist not supported anymore, For the loader config of a treepanel now you can use Ext.ComponentLoader but i would suggest you rather use Ext.data.TreeStore which you can configure to load your data similar to Ext.tree.TreeLoader .. for documentation use the extjs 4 api .. http://dev.sencha.com/deploy/ext-4.0.2a/docs/#/api/Ext.data.TreeStore

also you can check some examples they have : http://dev.sencha.com/deploy/ext-4.0.2a/examples/#sample-6

http://dev.sencha.com/deploy/ext-4.0.2a/examples/tree/check-tree.js