Question

我正在使用GWTUpload，库在这里https://code.google.com/p/gwtupload/

在该网站上找到的客户端示例代码具有以下结构：

 // Attach an image to the pictures viewer
private OnLoadPreloadedImageHandler showImage = new OnLoadPreloadedImageHandler() {
    public void onLoad(PreloadedImage image) {
      //showImageFlowPanel code solution 1
      image.setWidth("75px");
      showImageFlowPanel.add(image);
    }
};


private IUploader.OnFinishUploaderHandler onFinishUploaderHandler = new IUploader.OnFinishUploaderHandler() {
      public void onFinish(IUploader uploader) {
        if (uploader.getStatus() == Status.SUCCESS) {

          new PreloadedImage(uploader.fileUrl(), showImage);

          UploadedInfo info = uploader.getServerInfo();

          String headShotImageUrl="http://"+Window.Location.getHost()+"/" +"images/uploaded/"+info.message;
          //headShotImage code solution 2
          if(!"".equals(headShotImageUrl) && UriUtils.isSafeUri(headShotImageUrl)){
              headShotImage.setUrl(UriUtils.fromString(headShotImageUrl));
          }



        }
      }
    };

该示例使用showImageFlowPanel（解决方案1）来存储图像，但我想将图像存储在headShotImage内，并在用户上传图像成功后获取网址，请参阅headShotImage（解决方案2）上面的代码。

好的，headShotImage代码工作正常但我不知道如何在用户删除图像时将其删除。如果我在解决方案1中使用showImageFlowPanel，那么程序会自动删除图像，我不需要做任何事情。

所以我的问题是“当用户在GWTUpload中删除上传的图像时，在何处调用操作？”

Answer 1

您必须使用setOnCancelUploaderHandler。看一下从演示中获取的代码。

// When the user clicks a cancel button we get an event
uploader.addOnCancelUploadHandler ( 
  new IUploader.OnCancelUploaderHandler() {
    public void onCancel(IUploader uploader) {
      for (String iname : uploader.getServerMessage().getUploadedFieldNames()) {
        // loadedImages is an temporary table where we are adding all uploaded files
        // indexed by field name
        Widget w = loadedImages.get(iname);
        if (w != null) {
          w.removeFromParent();
        loadedImages.remove(uploader.getInputName());
       }
     }
   }
});

当用户在GWTUpload中删除上传的图像时，在哪里调用Action？

1 个答案: