Question

How can I use a Javascript library (downloaded from a CDN) inside JSNI code?

For example, I would like to call the javascript Stripe method, from within this JSNI method:

    private native void contactStripe(String creditCard, String cvc, String expiryMonth, String expiryYear) /*-{
        $wnd.Stripe.setPublishableKey('my_stripe_publishable_key');
        $wnd.Stripe.createToken({
            number: creditCard,
            cvc: cvc,
            exp_month: expiryMonth,
            exp_year: expiryYear
        }, callBack);
    }-*/;

… but the Stripe javascript method is undefined.

(more on the Stripe.createToken method https://stripe.com/docs/tutorials/forms#create-a-single-use-token)

The Stripe javascript file is injected using the CDN url:

ScriptInjector.fromUrl("https://js.stripe.com/v1/").setCallback(
    new Callback<Void, Exception>() {
    public void onFailure(Exception reason) {
    }
    public void onSuccess(Void result) {
        contactStripe("0000111122223333", "456", "04", "2014");
    }
}).inject();

Answer 1

If you want the JS script to be injected in a way that the global variables it defines are accessible through $wnd, you have to setWindow(ScriptInjector.TOP_WINDOW).