Dynamically change the json-Store root

[nagendra8808]

hi guys sorry for creating this duplicate thread but solution presented in previous thread was not working ..

I am using extjs 3.4.0 I have a json store as follows

var cat2Store = new Ext.data.JsonStore({

		fields: ['cid','id', 'value'],
		root: 'cat2',
		url: 'json/combo2.json'
		
	});

it reads the following json file

{
cat2:[
	{
		cid:'1',
		id:'1',
		value : 'A1'
	},{
		cid:'1',
		id:'2',
		value : 'A2'
	},{
		cid:'2',
		id:'3',
		value : 'B1'
	},{
		cid:'2',
		id:'4',
		value : 'B2'
	}
	
	
	]
	,
	cat3:[
	{
		cid:'1',
		id:'1',
		value : 'C1'
	},{
		cid:'1',
		id:'2',
		value : 'C2'
	},{
		cid:'2',
		id:'3',
		value : 'D1'
	},{
		cid:'2',
		id:'4',
		value : 'D2'
	}
	
	
	]
}

the store is read by a combobox as shown below

{
				        	xtype: 'combo',
				        	id : 'combo1',
				        	hiddenName: 'genre',
				        	fieldLabel: 'Cat2',
				        	mode: 'local',
				        	store: cat2Store,
				        	displayField:'value',
				        	valueField:'id',
				        	triggerAction: 'all',
				        	listeners: 
				        	{
								select :
								function(e) 
								{
									//Help needed here
								}
				        	}

				        }

my question is how do i change the root of my store from cat2 to cat3 on the select event of the combobox

[Kcarpenter]

You are in the wrong section, these threads relate to EXTJS 4.x not 3.x.
But to answer your question,
I think you can do.

getStore().getProxy().root = 'newRoot';
getStore().getProxy().url = 'new url'
getStore.load();

Its been a few months since I've touched 3.0 stores though.

[sanova]

Is there a way to do that in version 4 ?

I have to change root parameters of JsonStore inside a listeners of a Master Grid.


Thanks