什么是JSF自定义复合组件与自定义经典组件之间的区别

问题描述

我想构建一个自定义的JSF组件。现在我从oracle上读了一些文档，看了几个代码示例。问题是我有点困惑：

似乎有两种方法可以使用JSF 2.0+构建自定义组件。据我所知，自JSF 2.0以来我可以使用这些复合组件来构建我自己的组件。

但与Classical组件相比，它们有任何缺点吗？ / p>

当我使用Compisite Components时，我的组件会变得相当复杂吗？除了向下兼容性之外？

例如，我的Component将在java中有一些工作，这可能与Composite Components有关吗？

解决方案

如果复合组件很有用您希望通过纯XML表示将一堆密切相关的现有标记/组件/ HTML表示为单个可重用组件。

自定义当没有标准JSF标记/组件可用于实现该要求时，组件将是唯一的方法。例如。 < input type =file> ，< input type =range> 等请注意，只要需要，这样的自定义组件就可以在复合中使用。

完全有道理，对吧？

您可以创建一个所谓的支持组件类，扩展 UINamingContainer （或者至少实现 NamingContainer ）并通过< cc：interface componentType> 将其绑定到组合。 。

但请注意，有时复合组件不合适，您需要创建标签文件。例如，当您想要一个自定义且可重复使用的< h：column> 时。

另见：

i want to build a custom JSF Component. Now i read some docs from oracle and saw a few code Examples. The problem is i am a bit confused:

It seems there are two ways to build a custom component with JSF 2.0+. As far as i understood since JSF 2.0 i can use these Composite Components to build my own component.

But do they have any disadvantages compared to the "Classical" Component ?

My Component will be rather complex do i loose anything (beside downwards compability) when i use Compisite Components ?

For example my Component will have some work todo in java, is this possible with Composite Components ?

解决方案

A composite component is useful if you want to represent a bunch of closely related existing tags/components/HTML as a single and reuseable component by pure XML means.

A custom component would be the only way when there are no standard JSF tags/components available to achieve the requirement. E.g. <input type="file">, <input type="range">, etc. Note that such a custom component can in turn be used in a composite, whenever desireable.

Makes totally sense, right?

You can create a so-called "backing component" class extending UINamingContainer (or at least implementing NamingContainer) and bind it to the composite by <cc:interface componentType>. You can find several examples in my answers here.

Do however note that sometimes a composite component isn't suitable, you'd need to create a tag file instead. For example when you want to have a custom and reuseable <h:column>.

See also:

• When to use <ui:include>, tag files, composite components and/or custom components?

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