問題描述

我遇到了類似于 this 的導航案例問題.簡而言之，我正在嘗試使用 ajax 呈現(xiàn)的 h:commandLink 將導航從一個頁面重定向到另一個頁面.這是支持 bean

I'm stuck in a navigation case problem similar to this one. In a few words, I'm trying to redirect navigation from one page to another, using an ajax rendered h:commandLink. Here's the backing bean

@ManagedBean
public class StartBean {

    public void search(){
        FacesContext
            .getCurrentInstance()
            .getExternalContext()
            .getFlash()
            .put("result", "hooray!")
        ;
    }

    public String showResult(){
        return "result?faces-redirect=true";
    }
}

和起始頁

<h:body>
    <h:form prependId="false">
        <h:commandButton value="Click" action="#{startBean.search}">
            <f:ajax execute="@this" render="@form"/>
        </h:commandButton>
    
        <br/>
         
        <h:commandLink 
            action="#{startBean.showResult()}" 
            rendered="#{flash.result != null}" 
            value="#{flash.result}"
        />
    
    </h:form>
</h:body>

而 result 頁面只是顯示一條消息.兩個頁面都在 Web 模塊上下文根目錄中.碰巧 h:commandLink 在ajax提交后正確顯示，但單擊它會導致頁面刷新.它不會像預期的那樣重定向到 result 頁面.之后，如果頁面被重新加載(F5)，result 頁面就會顯示出來.這似乎是一個渲染周期的問題.

whereas result page is just showing a message. Both pages are on web module context root. It happens that the h:commandLink is correctly displayed after ajax submit, but clicking on it causes a page refresh. It doesn't redirect towards the result page, as expected. After it, if page is reloaded (F5), result page is shown. It seems to be a rendering cycle matter.

有什么建議嗎?

提前致謝.

推薦答案

所有輸入和命令組件的 rendered 屬性在提交表單時重新評估.因此，如果它評估 false，則 JSF 根本不會調用該操作.search() 方法的請求/響應完成后，F(xiàn)lash 作用域終止.當您發(fā)送 showResult() 的請求時，它不再存在于 Flash 范圍內.我建議將 bean 放在視圖范圍內，并將 rendered 屬性綁定到它的屬性.

The rendered attribute of all input and command components is re-evaluated when the form is submitted. So if it evaluates false, then JSF simply won't invoke the action. The Flash scope is terminated when the request/response of the search() method is finished. It isn't there in the Flash scope anymore when you send the request of the showResult(). I suggest to put the bean in the view scope and bind the rendered attribute to its property instead.

@ManagedBean
@ViewScoped
public class StartBean {

    private String result;

    public void search(){
        result = "hooray";
    }

    public String showResult(){
        return "result?faces-redirect=true";
    }

    public String getResult() {
        return result;
    }

}

與

<h:commandLink 
    action="#{startBean.showResult}" 
    rendered="#{startBean.result != null}" 
    value="#{startBean.result}"
/>

另見:

• commandButton/commandLink/ajax action/listener 方法未調用或輸入值未更新

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