我正在使用 GWT 编写一个简单的应用程序。我已经使用 dockPanel 将视图分成不同的部分。我需要调用一个在dockPanel 的某个面板中调用facebook 功能的脚本。这是Java中的代码
public class XXXX implements EntryPoint
{
private DockLayoutPanel dock = new DockLayoutPanel(Unit.PX);
private HorizontalPanel navPanel = new HorizontalPanel();
private VerticalPanel fbPanel = new VerticalPanel();
private HorizontalPanel ratingsPanel = new HorizontalPanel();
private Marker m = null;
private InfoWindow iw = null;
MapWidget map= null;
public void onModuleLoad()
{
implementDockPanelLayout();
implementMapView();
// Add the facebook Javascript script to the fbPanel of the dock
injectFBInitCode();
RootLayoutPanel.get().add(dock);
}
private void implementDockLayoutSetup()
{
navPanel.add(new HTML("<h3>Navigation Panel</h3>"));
fbPanel.add(new HTML("<div id = \"fb-root\"><h3>FB Comments should go here </h3></div>"));
ratingsPanel.add(new HTML("<h3>Ratings Here</h3>"));
dock.addNorth(navPanel, 50);
dock.addEast(fbPanel, 300);
dock.addSouth(ratingsPanel, 50);
}
private native void injectFBInitCode() /*-{
//??How to associate this script with the fbPanel which contains
the div with id= fb-root
function(d, s, id)
{
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=XXXXXX";
fjs.parentNode.insertBefore(js, fjs);
}
(document, 'script', 'facebook-jssdk');
}-*/;
private void implementMapView()
{
...}
当我运行上述代码时，我的浏览器中出现异常：
08:29:05.514 [ERROR] [SomeProj] Unable to load module entry point class XXX.client.SomeProj (see associated exception for details)
com.google.gwt.core.client.JavaScriptException: (null): null
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:248)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:289)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
at cs310.client.someProj.injectFBInitCode(someProj.java)
at cs310.client.someProj.onModuleLoad(someProj.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:396)
at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:525)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Thread.java:680)
我不太熟悉如何从我的 GWT 代码中调用 Javascript 函数。我查看了教程和一些示例，并想出了这段代码。但我卡住了，
有人可以帮我解决这个问题。
谢谢