ios - Inappbrowser not loading -

im using phonegap 2.9.0 in ios, have gone through tutorial inappbrowser .and have tried following in application

app.js calling method

indexpnl.element.on({         tap: function (e) {             var el = ext.get(e.target);             var bval = el.getid();      if (bval == "btnfacebook") {               //   ondeviceready()//using application screen self loading site view not in inappbrowser               document.addeventlistener("deviceready",ondeviceready, false);//here nothing happening             }         }     }); 

jsfunction.js method

function ondeviceready() {     var ref = window.open('http://www.facebook.com', '_blank', 'location=yes');     ref.addeventlistener('loadstart', function() { alert('start: ' + event.url); });     ref.addeventlistener('loadstop', function() { alert('stop: ' + event.url); });     ref.addeventlistener('exit', function() { alert(event.type); }); } 

and have include plug in config.xml

<feature name="inappbrowser">     <param name="ios-package" value="cdvinappbrowser" /> </feature> 

when call using above method nothing happens.when call on ondeviceready() site loading in application itslef not in inapp browser.what wrong code

dunno have checked have

<script src="phonegap.js"></script>  

in script in

https://build.phonegap.com/docs/plugins-using

leaving out can produce kind of errors