h：commandButton从第二次点击开始工作 [英] h:commandButton works from the second click

问题描述

以下是我的代码：

 < h：form> 
< h：messages errorClass =errorMessageinfoClass =infoMessage
 warnClass =warnMessage>< / h：messages> 
 < h：outputText value =login：/> 
< h：inputText id =usernamevalue =＃{securityBean.username}/> 
< h：outputText value =password：/> 
< h：inputSecret id =passwordvalue =＃{securityBean.password}/> 
< h：commandButton value =loginaction =＃{securityBean.login}/> 
< / h：panelGroup> 
 
< h：panelGroup id =logoutlayout =blockrendered =＃{securityBean.authorized}> 
 < h：commandButton value =logoutaction =＃{securityBean.logout}/> 
< / h：panelGroup> 
< / h：表格> 
  

这里是backing bean方法

<$ p $ （）; getReternalContext（）。getRequest（）;返回一个新的对象。
尝试{
request.login（username，password）;
} catch（ServletException e）{
FacesContext.getCurrentInstance（）。addMessage（null，new FacesMessage（FacesMessage.SEVERITY_ERROR，An Error Occured：Login failed，null））;
e.printStackTrace（）;
}
返回null;
}

public Object logout（）{
HttpSession session =（HttpSession）FacesContext.getCurrentInstance（）。getExternalContext（）。getSession（false）;
if（session！= null）{
session.invalidate（）;
}
返回null;
}
public boolean isAuthorized（）{
return FacesContext.getCurrentInstance（）。getExternalContext（）。getUserPrincipal（）！= null&&
FacesContext.getCurrentInstance（）。getExternalContext（）。getUserPrincipal（）。getName（）！= null&&
！FacesContext.getCurrentInstance（）。getExternalContext（）。getUserPrincipal（）。getName（）。isEmpty（）;
}

登录后，会显示注销按钮，但仅在第二次点击时才有效。正如你所看到的，在这里没有使用ajax，所以这个 http ：//balusc.blogspot.com/2011/09/communication-in-jsf-20.html#AjaxRenderingOfContentWhichContainsAnotherForm 不能帮助我..
如何让它工作正确？

解决方案

我认为你有这个问题，因为你需要重定向（使用结果，而不是null）主页或注销后的东西。我有这个问题，我解决了这样的问题：

pre $ public String logout（）{
HttpSession session =（HttpSession ）FacesContext.getCurrentInstance（）。getExternalContext（）。getSession（false）;
if（session！= null）{
session.invalidate（）;
}
返回redirectToHomePageAfterLogout;
}


希望这有助于您！ ：）

Here is my code:

<h:form>
    <h:messages errorClass="errorMessage" infoClass="infoMessage"
                warnClass="warnMessage"></h:messages>
    <h:panelGroup id="login" layout="block" rendered="#{!securityBean.authorized}">
        <h:outputText value="login:"/>
        <h:inputText id="username" value="#{securityBean.username}"/>
        <h:outputText value="password:"/>
        <h:inputSecret id="password" value="#{securityBean.password}"/>
        <h:commandButton value="login" action="#{securityBean.login}"/>
    </h:panelGroup>

    <h:panelGroup id="logout" layout="block" rendered="#{securityBean.authorized}">
        <h:graphicImage id="img" library="img" name="login_success.jpg"/>
        <h:commandButton value="logout" action="#{securityBean.logout}"/>
    </h:panelGroup>
</h:form>

here is backing bean methods

    public Object login() throws ServletException {
        HttpServletRequest request = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
        try {
            request.login(username, password);
        } catch (ServletException e) {
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "An Error Occured: Login failed", null));
            e.printStackTrace();
        }
        return null;
    }

    public Object logout(){
        HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
        if(session != null){
            session.invalidate();
        }
        return null;
    }
    public boolean isAuthorized() {
        return FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal() != null &&
                FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal().getName() != null &&
                !FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal().getName().isEmpty();
    }

After login, logout button appears, but it works only on the second click. As you can see no ajax is used here, so this http://balusc.blogspot.com/2011/09/communication-in-jsf-20.html#AjaxRenderingOfContentWhichContainsAnotherForm can't help me.. How can I make it work correct? Thanks in advance.

解决方案

I think you have that problem because you need a redirection (using an outcome, not null) to a home page or something after logout. I had that problem, and I solved like this:

public String logout(){
    HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false);
    if(session != null){
        session.invalidate();
    }
    return "redirectToHomePageAfterLogout";
}

Hope this helps! :)

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