First, I am new to Java EE, came from a strong ASP .NET development background. I have gone through the net, and I might miss this but it seems like there is no simple and straight-to-the-point tutorials on how I could connect backing bean class to a JSF components.
一个很好的例子就是这样,目前,我正试图建立一个联合论坛的网页,该网页有一套像菜单和一套表格这样的链接。 我计划做的是,在点击某一环节时,将提供一种特殊的形式。
In ASP. NET,我可以轻易检索这个要素,然后确定可展示的属性。 我很想知道,在联合武装部队中,这样做是否容易(甚至有办法)。
表格已经放在网页上,只是确定“发送者”在我点击某一环节时的真实性。
是的,使用<条码>。
<h:form rendered="#{some boolean condition}">
通常,你会将其与模型挂钩,而不是让模型 gr碎成分,加以操纵。
E.g.
<h:form rendered="#{bean.booleanValue}" />
<h:form rendered="#{bean.intValue gt 10}" />
<h:form rendered="#{bean.objectValue eq null}" />
<h:form rendered="#{bean.stringValue ne someValue }" />
<h:form rendered="#{not empty bean.collectionValue}" />
<h:form rendered="#{not bean.booleanValue and bean.intValue ne 0}" />
<h:form rendered="#{bean.enumValue eq ONE or bean.enumValue eq TWO }" />
Note the importance of keyword based EL营运人 如gt,ge , 和lt und >,>>=<= andlt; as anglecode>< and >> are reservationss in XML. See also this related Q&A: 放下X超文本:内容必须包含信息完备的特性数据或标记。
As to your specific use case, let s assume that the link is passing a parameter like below:
<a href="page.xhtml?form=1">link</a>
之后,你可以显示如下表格:
<h:form rendered="#{param.form eq 1 }">
<<>(#{param}>系指代表请求参数的<代码>Map的隐含EL物体
除以前的职位外,您还可以担任其他职务。
<h:form rendered="#{!bean.boolvalue}" />
<h:form rendered="#{bean.textvalue == value }" />
Jsf 2.0
我们可以提供形式的组成部分,因为我们将利用已作出的属性。
This attribute takes true/false. If the expression evaluates to a true then the specified component will be rendered otherwise it wont render in the screen.
具体地说,我想给某个情况提供一个子。
<p:commandButton id="addCommentsBtn"
value="Add Comments" title="Add Comments"
rendered="#{backingBean.booleanResultOrVariable}">
</p:commandButton>
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