javascript - ExtJS - DWR proxy with json store? -

i'm trying make jsonstore use function takes arguments , executes asynchronously, i'm not sure how this.

mymethod takes callback, how tie callback data jsonstore?

store = new ext.data.jsonstore({     proxy: new ext.data.directproxy(     {         directfn:(new function(){return mydwrservice.mymethod('test')}),     }),     autoload:true,... 

i tried using dwrproxy implementation, when don't pass fields jsonreader, no data populates grid, , when do pass fields, bunch of blank rows created. gives?

   store = new ext.data.store({         proxy: new ext.ux.data.dwrproxy({             apiactiontohandlermap:{                 read: {                     dwrfunction: myservice.mymethod,                     getdwrargsfunction: function() {                         return ["testuser"]                     }                 }             }         }),         reader: new ext.data.jsonreader({fields:myfields}),         autoload:true,     fields:myfields,     remotesort:true }); 

use dwr3 jsonp enabled , won't need proxy.