Tapestry 4.1 中@If 和 someText@If jwcid 的区别

Question

考虑到 Tapestry 4.1 自 2007 年或 08 年以来就没有更新过，这可能是一个远景。但在工作中，他们有一个使用 Tapestry 4.1 的旧遗留应用程序。

我在想，这两者有什么区别

<span jwcid="something@If" condition="ognl:something">

和

<span jwcid="@If" condition="ognl:something">

如果有的话？或者 @If 之前的 something 除了使它成为一个唯一的 id 之外没有其他目的，也许可以在其他地方引用？

这是我能够找到的一些关于 Tapestry 4.1 的文档，但我无法找到我的问题的答案：

编辑：好的，我找到了部分答案 in the documentation 我已经在上面链接了。

Understanding DirectLink URLs

The URLs generated by the DirectLink component are more complex than those generated by the PageLink component. Let's look at one:
http://localhost:8080/directlink/app?component=%24DirectLink&page=Home&service=direct&session=T

The first query parameter, component, identifies the component within the page. That %24 is "URL-ese" for a dollar sign. In Tapestry, every component ends up with a unique id within its page. If you don't provide one, Tapestry creates one from the component type, prefixed with a dollar sign. Here, our annoynmous DirectLink component was given the id $DirectLink. If you had many different DirectLinks on a page, you'd start seeing component ids such as $DirectLink_0, $DirectLink_1, etc.
You can give a component a shorter and more mneumonic id by putting the desired id before the "@" sign:
<a href="#" jwcid="inc@DirectLink" listener="listener:doClick">increment counter</a>

After making that change to the template, the URL for the DirectLink component is just a bit easier to read:
http://localhost:8080/directlink/app?component=inc&page=Home&service=direct&session=T

但这如何适用于不显示在 URL 中的 @If？

Answer 1

如您所说，这只是 Tapestry 在其组件模型中使用的标识符。

以下是用户指南中的相关文档：Component IDs

Tapestry 4.1 中@If 和 someText@If jwcid 的区别

Difference between @If and someText@If jwcid in Tapestry 4.1

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