private void addFaceBookButton() {
exportMyFunction();
panel.setHTML(
panel.getHTML()
+ "<fb:login-button show-faces=\"false\" width=\"400\" max-rows=\"1\" size=\"large\"></fb:login-button>");
ScriptElement script = Document.get().createScriptElement();
script.setSrc("http://localhost:8080/resources/facebook.js");
Element span = Document.get().getElementsByTagName("div").getItem(0);
span.appendChild(script);
}
/**
* Method injecting native chart.js code into the browser<br>
* In case code already been injected do nothing
*/
public static void ensureInjected() { // TODO: do real injection (lazy loading)
if (injected) return;
Resources res = GWT.create(Resources.class);
String source = res.chartJsSource().getText();
ScriptElement scriptElement = Document.get().createScriptElement();
scriptElement.setId("_chartjs");
scriptElement.setInnerText(source);
Document.get().getBody().appendChild(scriptElement);
injected = true;
}
/**
* Sends a JSONP request by embedding a SCRIPT tag into the document.
*
* @param id the id used for the script tag and to identify the callback
* @param request the request to be made
* @param parameters the parameters for the request
* @param function a function that transforms the response into the type that the callback needs
* @param callback the callback that should be called with the transformed response
*/
private <T> void sendJsonpRequest(
String id,
String request,
Map<String, Object> parameters,
final Function<String, ? extends T> function,
final AsyncCallback<T> callback) {
Preconditions.checkNotNull(id);
// Prepare an intermediate callback that converts the String result to T.
if (callback != null) {
Preconditions.checkNotNull(function);
CALLBACKS.put(
id,
new AsyncCallback<String>() {
@Override
public void onSuccess(String jsonResult) {
T result;
try {
result = function.apply(jsonResult);
} catch (RuntimeException e) {
callback.onFailure(e);
return;
}
callback.onSuccess(result);
}
@Override
public void onFailure(Throwable caught) {
callback.onFailure(caught);
}
});
}
// Insert a script tag into the document.
Document document = Document.get();
ScriptElement script = document.createScriptElement();
String uri = makeURI(request, parameters, id);
script.setSrc(uri);
script.setId(id);
Element bodyElement = document.getElementsByTagName("body").getItem(0);
Element previous = document.getElementById(id);
if (previous != null) {
bodyElement.replaceChild(script, previous);
} else {
bodyElement.appendChild(script);
}
}
private static ScriptElement createScriptElement() {
ScriptElement script = Document.get().createScriptElement();
script.setAttribute("type", "text/javascript");
return script;
}
public static void intject(String javaScript) {
HeadElement head = getHead();
ScriptElement element = createScriptElement();
element.setText(javaScript);
head.appendChild(element);
}
