JSF ajax listener -
i'm trying figure out how log out user f:ajax call using jsf , backing managed bean. problem i'm having can't quite figure out why call order ajax listener , rerender of login form.
below simplified code. basic idea of code this
if (uid != null) { // show log out } else { // show log in } i not understanding how ajax listeners , form rerender done.
the jsf page
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:c="http://java.sun.com/jsp/jstl/core"> <h:head> <title>facelet title</title> </h:head> <h:body> <f:view> <h:form id="loginform"> <c:choose> <c:when test="${userbean.uid != null}"> <span>hi, #{userbean.uid}</span> <h:commandbutton value="logout"> <f:ajax event="click" listener="#{userbean.logout}" render="loginform"/> </h:commandbutton> </c:when> <c:otherwise> <span>user name: </span> <h:inputtext value="#{userbean.uid}" id="uid" /> <h:commandbutton value="login" action="#{userbean.login}" /> </c:otherwise> </c:choose> </h:form> </f:view> </h:body> </html> the bean
package test.auth; import java.io.serializable; import javax.inject.named; import javax.enterprise.context.sessionscoped; import javax.faces.event.ajaxbehaviorevent; @named(value="userbean") @sessionscoped public class userbean implements serializable { private static final long serialversionuid = -4292770567982457272l; private string uid; /** creates new instance of userbean */ public userbean() { } public string getuid() { return uid; } public void setuid(string uid) { this.uid = uid; } public string login () { return "faces/index.xhtml"; } public void logout (ajaxbehaviorevent event) { this.uid = null; } } the problem code when clicking logout form reloads still in logged in state though uid has been set null. i've checked debugger. how make render executed after ajax listener?
the jstl tags executed during view build time, not during view render time. @ moment jsf reusing view state re-render, jstl tags won't re-executed, because not there anymore.
you want use jsf rendered attribute instead.
<h:form id="loginform"> <h:panelgroup rendered="#{userbean.uid != null}"> <span>hi, #{userbean.uid}</span> <h:commandbutton value="logout"> <f:ajax event="click" listener="#{userbean.logout}" render="loginform"/> </h:commandbutton> </h:panelgroup> <h:panelgroup rendered="#{userbean.uid == null}"> <span>user name: </span> <h:inputtext value="#{userbean.uid}" id="uid" /> <h:commandbutton value="login" action="#{userbean.login}" /> </h:panelgroup> </h:form>
Comments
Post a Comment