Hi,

You can add javascript asynchronously whenever you want and invoke any 
function from that js using JSNI.

Please refer following 
https://developers.google.com/web-toolkit/articles/using_gwt_for_json_mashups
 

You will probably need something like following to add js in the page and 
then you can invoke the method from your js using JSNI

public void addScript(String url) {
    Element e = DOM.createElement("script");
    DOM.setAttribute(e, "language", "JavaScript");
    DOM.setAttribute(e, "src", url);
    DOM.appendChild(RootPanel.get().getElement(), e);
} 

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