Store({2 proxy: new Ext.data.ScriptTagProxy({3 url: 'yoururl.json'4 }),5 reader: new Ext.data.JsonReader({6 root: 'Fields',7 totalProperty: 'totalCount',8 id: 'id'9 }, [10 ,11 12 ])13 });14 var combobox = new Ext.form.ComboBox({15 id:'combobox',16 x:0,17 y:20,18 store: da,19 displayField:'fiel |