如何创建Facelets子页面

Question

Say I have a file index.xhtml , how can I dynamically create subpages for it like index.xhtml?id=1 . And is there any way to grab this id=1 with some actions in this page?

Answer 1

That's why <f:viewParam> tag exists in JSF. It allows you to get the query parameter(s): those after ? and separated with & , and use it in your view directly, or set it as a model property, convert/validate it, etc.

But you're getting its meaning the wrong way. It is not used to create 'many (sub)pages', but to pass information to the view , so that view could be dynamic, meaning that rendered information will be derived basing on those view parameters (ie showing user with a certain id). It also thus allows to create bookmarkable URLs.

Its usage is basically as follows:

<f:metadata>
    <f:viewParam name="id" value="#{yourBean.userId}" />
</f:metadata>

This will preset the given property of your bean with the parameter passed to the view as query parameter.

You can find more information in answer to What can <f:metadata> and <f:viewParam> be used for? .