GWT - 做一个简单的载入画面最简单的方法，直到文件被加载 [英] GWT - easiest way to do a simple loading screen until file is loaded
问题描述
当点击一个按钮，我的GWT应用程序返回嵌入在HTML页面的PDF文件看起来是这样的：
When clicking a button, my GWT application returns a PDF file embedded in an HTML page which looks something like:
<html><head></head>
<body marginwidth="0" marginheight="0" bgcolor="rgb(38,38,38)">
<embed width="100%" height="100%" name="plugin"
src="http://myserver/?cmd=getMyPdf" type="application/pdf">
</body>
</html>
问题是，它可能需要一段时间服务器创建这个PDF文件，所以我要的是等待画面的加载动画，可以在后台将PDF文件下载，然后在文件完成后，如上所述显示该网页。
Problem is it can take a while for the server to create this PDF file, so what I want is a waiting screen with a loading animation which can have the PDF file download in the background, and then when the file is done, display the page as described above.
一个显而易见的方法是显示装载页，发送异步命令到服务器，那么一旦onSucceed方法被调用时，调用的页面为正常。缺点是我不得不添加一些服务器端逻辑使得PDF创建工作在后台...
One obvious way would be to display a loading page, send an asynchronous command to the server and then once the onSucceed method is called, call the page as normal. Downside is I'd have to add some server-side logic for making the PDF creation work in the background...
有没有办法做到这一点客户端与GWT API？
Is there any way to do this client-side with the GWT API?
推荐答案
你有没有看到这个计算器问题的检测时，浏览器接收文件下载？基本上给出的答案是，你设置在返回响应的cookie，并在客户端等待这个cookie进行设置。这很容易与GWT做，因为它有一个调度器（用于重复计时器检查），并方便地访问缓存数据。你仍然需要做一些服务器更改，但你不必创建一个后台进程。
Did you see this stackoverflow question Detect when browser receives file download? Basically the answer given is that you set a cookie in the return response and wait on the client side for this cookie to be set. This can be done easily with GWT as it has a Scheduler (for the repeated timer check) and easy access to Cookies. You still need to make some server changes, but you don't have to create a background process.
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