Inject external javascript code in JSNI

Question

I am integrating Google Wallet on my GWT app. At some point (at beginning of JSNI function purchase()), I need to inject API JS code in my app.

<script src="https://sandbox.google.com/checkout/inapp/lib/buy.js"></script>

How can I do it?

public static native void purchase(String token) /*-{
// Success handler
  var successHandler = function(status){
    if ($wnd.console != undefined) {
      console.log("Purchase completed successfully: ", status);
      //window.location.reload();
    }
  }

  // Failure handler
  var failureHandler = function(status){
    if ($wnd.console != undefined) {
      console.log("Purchase failed ", status);
    }
  }

  google.payments.inapp.buy({
        'jwt'     : token,
        'success' : successHandler,
        'failure' : failureHandler
    });
}-*/;

Answer 1

You have to inject the code with a ScriptInjector, because the GWT-code may run within a hidden IFRAME (depends on the used Linker)