导航到另一个页面时查看参数 [英] View parameter when navigating to another page

问题描述

我正在使用JSF2，我需要能够通过commandLink将参数从一个JSF页面传递到另一页面.

I am using JSF2, and I need to be able to pass a parameter from one JSF page to another via a commandLink.

我在页面funding.xhtml(ViewScoped)上，并定义了以下链接:

I am on page funding.xhtml (ViewScoped) and have the following link defined:

<p:commandLink styleClass="toolbar" 
               action="/application/customerApplicationManagement.jsf">
    <p:graphicImage url="/resources/gfx/search.png" />
    <h:outputText value="#{msg.menu_searchApplications}" styleClass="toolbarLink" />
</p:commandLink>

我需要将一个字符串值传递给customerApplicationManagement页面，以指示我来自哪个页面，以便在选择应用程序后可以返回该页面.我已经尝试过一些有关如何传递此值的建议，包括f:param，f:viewParam.我什至尝试将其直接添加到url(?fromPage=funding)等中，但是它们似乎仅在将值传递回当前页面时才起作用，而不是我要导航的新页面.

I need to pass a string value to the customerApplicationManagement page indicating which page I came from so that after selecting an application, I can return to that page. I have tried several suggestions about how to pass this value including f:param, f:viewParam. I have even tried just adding it directly to the url (?fromPage=funding) etc, but they all seem to work only when the value is passed back to the current page, not a new page I am navigating to.

有人可以告诉我如何最好地做到这一点.

Can someone show me how this can best be accomplished.

推荐答案

使用<f:param>和<f:viewParam>:

源页面:

<p:commandLink styleClass="toolbar" 
           action="/application/customerApplicationManagement.jsf">
    <p:graphicImage url="/resources/gfx/search.png" />
    <h:outputText value="#{msg.menu_searchApplications}" styleClass="toolbarLink" />
    <f:param name="fromPage" value="funding.xhtml" />
</p:commandLink>

目标页面(绑定):

<f:metadata>
    <f:viewParam name="fromPage" value="#{destinationBacking.fromPage}" />
</f:metadata />

<h:link value="Go back!" outcome="#{destinationBacking.fromPage}" />

目标页面(未绑定):

<f:metadata>
    <f:viewParam name="fromPage" />
</f:metadata />

<h:link value="Go back!" outcome="fromPage" />

支持bean(仅当您要绑定参数时):

@ManagedBean
@ViewScoped
public class DestinationBacking{
    String fromPage;

    public String getFromPage(){
        return fromPage;
    }

    public void setFromPage(String frompage){
        fromPage = frompage;
    }
}

您的视图路径将从目标支持bean绑定到fromPage属性，然后您可以使用它返回到原始页面.

Your view path will be binded to fromPage property from the destination backing bean and after you can use it to return to the original page.

我还要说这种方式对于最终用户来说有点可破解"，我的意思是，您正在通过纯url传递原始路径.另请参见实现此目标的其他方法，例如 Flash范围，这在使用@ViewScoped bean时特别有用.

Also I want to say that this way is a bit 'hackeable' by the end user, I mean, you're passing the original path through pure url. See also other ways to achieve that, as flash scope, which is very useful specially if you're working with @ViewScoped beans.

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