protected void renderScriptBlock(String id) throws IOException {
        ResponseWriter rw = context.getResponseWriter();
        rw.startElement("script", null);
        rw.writeAttribute("id", id + "_s", null);
        RendererUtils.encodeScriptTypeIfNecessary(context);
    }
@param widgetClass   Constructor name of the widget
@param widgetVar     Name of the client side widget
@param id            Client id of the component
@param endFunction   If the init script is wrapped by a method and if the endFunction parentheses should be rendered.
@throws IOException if any IO exception occurs
@return              The current instance.
primefaces/src/main/java/org/primefaces/util/WidgetBuilder.java