android - Cordova - Trying to execute a function inside a webview -

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i have webview website working in app. i'm trying asking users when hit android button if want leave app. i'm using inappbrowser plugin. here's code.

document.addeventlistener("deviceready", ondeviceready, false);          // cordova ready         function ondeviceready() {             navigator.splashscreen.show();             var ref = window.open("http://m.estadao.com.br", "_self", "location=no");              ref.addeventlistener('loadstop', function(){                 ref.executescript({                     code:                           document.addeventlistener("backbutton", onbackkeydown, false);                         function onbackkeydown() {                             navigator.notification.confirm(                                 "tem certeza que deseja sair?",                                 function(buttonindex){                                     confirmexit(buttonindex);                                 },                                 "aviso",                                 "ok, cancel"                             );                         }                         function confirmexit(stat){                             if (stat == "1"){                                 navigator.app.exitapp();                             } else {                                 window.open("http://m.estadao.com.br", "_self", "location=no", "zoom=no");                             }                         };                 });             });         }

and here link of plugin http://cordova.apache.org/docs/en/2.7.0/cordova_inappbrowser_inappbrowser.md.html#executescript

any idea can make work ? thanks!

i assuming problem back-button event not getting triggered once webview loads. common problem using in-appbrowser plugin webview. loads page loose control on page. use following plugin https://github.com/wizcorp/phonegap-plugin-wizviewmanager/ webview. creates custom webview inside phonegap app , still have control on button , can define size of webview


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