漂亮的脸蛋JSF 2:我们是否总是需要将参数传递给URL来检索它们? [英] PrettyFaces & JSF 2 : Do we always need to pass parameters to the URL to retrieve them?

问题描述

我们是否总是需要将参数传递给URL来检索它们?

在我的示例中，我无法检索名为"study"的参数； 我该怎么办?

XHTML文件发送器:

 <h:commandButton  value="Send" type="button" action="pretty:participant">
    <f:param  name="study"  value ="test"  />
</h:commandButton> 
 

XHTML文件接收器:

 <h:outputFormat value="Print : {0} ">
   <f:param value="#{study}" />      
</h:outputFormat>
 

Pretty Config XML:

 <url-mapping id="participant">
    <pattern value="/Participant/New/" />
    <view-id value="/addParticipant.xhtml" />
</url-mapping>
 

解决方案

如果要使用prettyfaces进行操作，是的，必须这样做，因为它是url改写工具，因此参数必须包含在url中.为了使代码正常工作，在接收器页面上使用f:viewParam标签之前，应先使用f:viewParam标签:

 <f:metadata>
    <f:viewParam name="study" value="#{destinationBean.study}" />
</f:metadata>

<h:outputFormat value="Print : {0} ">
   <f:param value="#{destinationBean.study}" />      
</h:outputFormat>
 

但是，如果要摆脱通过url发送参数的麻烦，可以使用 Flash作用域作为替代.但是，这涉及到JSF而不是Prettyfaces.如果您想使用此解决方案，我强烈建议您避免使用Mojarra JSF 2.x的早期版本，因为它们与此有关.

Do we always need to pass parameters to the URL to retrieve them ?

In my example , I can't get to retrieve my param named 'study'; How should i do that ?

XHTML File Sender:

<h:commandButton  value="Send" type="button" action="pretty:participant">
    <f:param  name="study"  value ="test"  />
</h:commandButton> 

XHTML File Recever:

<h:outputFormat value="Print : {0} ">
   <f:param value="#{study}" />      
</h:outputFormat>

Pretty Config XML :

<url-mapping id="participant">
    <pattern value="/Participant/New/" />
    <view-id value="/addParticipant.xhtml" />
</url-mapping>

解决方案

If you want to do it using prettyfaces, yes, you must because it's an url rewritting tool, so the params must go into the url. For your code to work, you should use the f:viewParam tag before using it in your receiver page:

<f:metadata>
    <f:viewParam name="study" value="#{destinationBean.study}" />
</f:metadata>

<h:outputFormat value="Print : {0} ">
   <f:param value="#{destinationBean.study}" />      
</h:outputFormat>

However, if you want to get rid of sending the parameter via url, you have the flash scope as an alternative. That, however, involves JSF and not Prettyfaces. If you want to go with this solution I highly encourage you to avoid early versions of Mojarra JSF 2.x, as they are buggy related to that.

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