iphone - How to implement a callback with phonegap -

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working on testing phonegap on iphone; have plugin returns simpl json data : 

nsstring* retstr = [[nsstring alloc]    initwithformat:@"%@({ code: '%@', image: '%@' });",    resulttext.text,resultimage.image];                         [ webview stringbyevaluatingjavascriptfromstring:retstr ];

and call js : 

var mydata = phonegap.exec("mymodile.myfunction", 'mycallback');   function mycallback (data) { alert (data); }

doesn't produce upon return.

any idea ?

// callback arguments nsstring * jscallback = [arguments objectatindex:0];  // create string nsstring* retstr = [[nsstring alloc]      initwithformat:@"%@({ code: '%@', image: '%@' });",                                  jscallback,resulttext.text,resultimage.image];    //execute [ webview stringbyevaluatingjavascriptfromstring:retstr ];

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