it seems that it is not possible to write iframe's content directly in
html.
you can add it programatically which seems even more convenient (but i
wanted to avoid it do to some inconsistency between browser as to when
cotnentDocument of an iframe becames available to code - there can
happen some delay in some browser and onload event is called event if
this iframe does not load any remote content.)
so with this precaution here's the code:
static class YourChart extends Widget {
private static final String API_URL = "http://ajax.googleapis.com/
ajax/static/modules/gviz/1.0/chart.js";
private HandlerRegistration handlerRegistration;
public YourChart(JSONObject userConf) {
this(userConf.toString());
}
public YourChart(final String userConf) {
final IFrameElement elem =
Document.get().createIFrameElement();
setElement(elem);
if(elem.getContentDocument() == null ||
elem.getContentDocument().getBody() == null){
handlerRegistration = addDomHandler(new LoadHandler(){
@Override
public void onLoad(LoadEvent event) {
initFrame(elem, userConf);
}
}, LoadEvent.getType());
}
else {
initFrame(elem, userConf);
}
}
private void initFrame(IFrameElement elem, String userConf) {
if(handlerRegistration != null){
handlerRegistration.removeHandler();
handlerRegistration = null;
}
Document cDoc = elem.getContentDocument();
BodyElement body = cDoc.getBody();
ScriptElement script = cDoc.createScriptElement(API_URL);
script.setInnerText(userConf);
body.appendChild(script);
}
}
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