查明 GWT 模块何时加载

发布于 2024-10-03 05:37:32 字数 1551 浏览 7 评论 0原文

我通过以下方式将 GWT 方法导出到本机 javascript：

public class FaceBookGalleryEntryPoint implements EntryPoint {

    @Override
    public void onModuleLoad() {

        FacebookGallery facebookGallery = new FacebookGallery();
        RootPanel.get().add(facebookGallery);

        initLoadGallery(facebookGallery);
    }

    private native void initLoadGallery(FacebookGallery pl) /*-{
        $wnd.loadGallery = function (galleryId) {
            [email protected]::loadGallery(Ljava/lang/String;)(galleryId);
        };
    }-*/;
}

在主机页面中，我尝试调用它：

<html>
    <head>
        <title>Facebook image gallery</title>
        <script type="text/javascript"
            src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>     
    </head>

    <body>
        <script type="text/javascript" src="/fbg/fbg.nocache.js"></script>
        <h1>Facebook gallery test</h1>
        <script type="text/javascript">
            $(document).ready(function() {
                loadGallery('blargh');              
            });
        </script>
    </body>
</html>

不幸的是，当调用 document.ready 回调时，该函数尚未定义。当从 Firebug 控制台手动执行时，该函数工作得很好。

我可以每 50 毫秒执行一次轮询，直到找到按该名称定义的函数，但这似乎是一种可怕的方法。

当模块加载时以及功能可用时，如何收到通知？

原文

I am exporting a GWT method to native javascript in the following manner:

public class FaceBookGalleryEntryPoint implements EntryPoint {

    @Override
    public void onModuleLoad() {

        FacebookGallery facebookGallery = new FacebookGallery();
        RootPanel.get().add(facebookGallery);

        initLoadGallery(facebookGallery);
    }

    private native void initLoadGallery(FacebookGallery pl) /*-{
        $wnd.loadGallery = function (galleryId) {
            [email protected]::loadGallery(Ljava/lang/String;)(galleryId);
        };
    }-*/;
}

In the host page, I am trying to invoke it:

<html>
    <head>
        <title>Facebook image gallery</title>
        <script type="text/javascript"
            src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>     
    </head>

    <body>
        <script type="text/javascript" src="/fbg/fbg.nocache.js"></script>
        <h1>Facebook gallery test</h1>
        <script type="text/javascript">
            $(document).ready(function() {
                loadGallery('blargh');              
            });
        </script>
    </body>
</html>

Unfortunately, when the document.ready callback is invoked, the function is not yet defined. When manually executed from the Firebug console the function works just fine.

I could perform some polling every 50 milliseconds until I find a defined function by that name, but it seems like a horrible approach.

How can I get notified when the module is loaded and therefore when the function is available?

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狼亦尘 2024-10-10 05:37:32

我会尝试在主机页中定义一个回调函数，并在 onModuleLoad() 方法末尾从 GWT 调用它。

主机页功能：

<script type="text/javascript">
  function onGwtReady() {
    loadGallery('blargh');              
  };
</script>

GWT：

public void onModuleLoad() {
  FacebookGallery facebookGallery = new FacebookGallery();
  RootPanel.get().add(facebookGallery);

  initLoadGallery(facebookGallery);

  // Using a deferred command ensures that notifyHostpage() is called after
  // GWT initialisation is finished.
  Scheduler.get().scheduleDeferred(new Command() {
    public void execute() {
      notifyHostpage();
    }
  }
}

private native void notifyHostpage() /*-{
  $wnd.onGwtReady();
}-*/;

I would try to define a callback function in the hostpage and call it from GWT at the end of the onModuleLoad() method.

Hostpage function:

<script type="text/javascript">
  function onGwtReady() {
    loadGallery('blargh');              
  };
</script>

GWT:

public void onModuleLoad() {
  FacebookGallery facebookGallery = new FacebookGallery();
  RootPanel.get().add(facebookGallery);

  initLoadGallery(facebookGallery);

  // Using a deferred command ensures that notifyHostpage() is called after
  // GWT initialisation is finished.
  Scheduler.get().scheduleDeferred(new Command() {
    public void execute() {
      notifyHostpage();
    }
  }
}

private native void notifyHostpage() /*-{
  $wnd.onGwtReady();
}-*/;

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