我正在开发一个jsf项目，我必须为用户集成一个用于图形打印验证的applet。我的applet工作正常，我从我的applet到jsf页面得到一个布尔值。首先，我的jsf形式的命令按钮将被禁用。我只想在我的applet返回true值时启用我的jsf按钮。我在这里粘贴我的代码。
我的jsf代码是：
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- <ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:c="http://java.sun.com/jsp/jstl/core"
template="/layouts/BasicTemplate.xhtml"
xmlns:h="http://java.sun.com/jsf/html">
<ui:define name="content">
<div> -->
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<ui:composition template="/layouts/BasicTemplate.xhtml">
<ui:define name="content">
<div class="container">
<script>
function doAlert(s)
{
if(s=="true")
{
alert(s);
rc();
alert('hi i am');
}
else
{
alert("Wrong Finger Print");
}
}
</script>
<h:form class="form-horizontal" id="myform" >
<div class="row">
<!-- <p:growl id="msgs" sticky="true" showDetail="true" /> -->
<!-- <div>
<div> </div>
<div>
<c:if test="${not empty param.login_error}">
<div>
Your login attempt was not successful, try again.
<br/>
Reason: #{sessionScope.SPRING_SECURITY_LAST_EXCEPTION.message}
<br/>
</div>
</c:if>
<form name="f" action="${request.contextPath}/j_spring_security_check" method="post">
<fieldset>
<h4>User Login</h4>
<div>
<div>
<span>Username:</span>
<c:if test="${not empty param.login_error}">
<c:set var="username" value="${sessionScope.SPRING_SECURITY_LAST_USERNAME}" />
</c:if>
<input type="text" name="j_username" value="#{username}" />
<br/>
<span class="password">Password:</span>
<input type="password" name="j_password" />
</div>
<div>
<div>
<input name="submit" type="submit" value="Login" />
</div>
</div>
</div>
</fieldset>
</form>
</div>
</div> -->
<h:messages />
<h:panelGrid columns="3" cellpadding="4" border="0" columnClasses="control-label">
<h:outputText value="Username :" />
<h:inputText id="username" value="#{loginBean.login}" label="username" style="width: 200;" />
<p:watermark for="username" value="Username" ></p:watermark>
<h:outputLabel for="password" value="Password :" />
<h:inputSecret id="password" value="#{loginBean.password}" label="password" style="width: 200;"/>
<p:watermark for="password" value="Password"></p:watermark>
<p:spacer></p:spacer>
<!-- <p:commandButton value="Login" action="#{loginBean.logMeIn}" widgetVar="mybutton" /> -->
<p:commandButton id="loginButton" value="Login" action="#{loginBean.logMeIn}" widgetVar="mybutton" disabled="#{!loginBean.enabled}"/>
<p:remoteCommand name="rc" update="loginButton" actionListener="#{loginBean.enableButton}" />
<p:spacer></p:spacer>
<h:outputText value="#{loginBean.enabled}"></h:outputText>
<applet id="fingureprintapplet" name="fingureprint" codebase="classes" code="fingerprintntscanner.MyClassApplet.class" archive="#{facesContext.externalContext.requestContextPath}/FIngerprintntScanner.jar,#{facesContext.externalContext.requestContextPath}/lib/NBioBSPJNI.jar" width="300" height="400">
</applet>
</h:panelGrid>
</div>
</h:form>
</div>
</ui:define>
</ui:composition>
</html>
和启用按钮的脚本是
JS是
function doAlert(s)
{
if(s)
{
alert(s);
rc();
}
}
</script>
Bean Is：
import java.io.Serializable;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
@ManagedBean(name = "loginBean")
@SessionScoped
public class LoginBean implements Serializable {
private static final long serialVersionUID = 1L;
private String login;
private String password;
private boolean enabled;
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public void enableButton() {
System.out.println("chandan");
enabled = true;
}
public boolean isEnabled() {
System.out.println("hi");
return enabled;
}
public void setEnabled(boolean enabled) {
this.enabled = enabled;
}
}
但没有任何效果。提醒我真实和虚假的价值。请帮忙
答案 0 :(得分：2)
查看此处的文档： http://www.primefaces.org/docs/guide/primefaces_user_guide_5_0.pdf
Primefaces Command Button支持使用widgetVar启用/禁用。
所以，按下按钮
<p:commandButton id="loginButton" value="Login"
action="#{loginBean.logMeIn}" widgetVar="mybutton"
disabled="#{!loginBean.enabled}"/>
你可以使用
function doAlert(s)
{
if(s)
{
alert(s);
myButton.disable(); // or enable()
}
}
它应该按预期工作。基本上这里不需要remote command - 但它也应该有效。
答案 1 :(得分：0)
您需要通过JSF启用该按钮，而不是通过JavaScript / HTML DOM启用该按钮。如果您需要通过JS执行此操作，则可以使用remoteCommand。这样的事情应该有效：
XHTML：
<p:commandButton id="loginButton" value="Login" action="#{loginBean.logMeIn}" widgetVar="mybutton" disabled="#{!bean.enabled}"/>
<p:remoteCommand name="rc" update="loginButton" actionListener="#{bean.enableButton}" />
JS：
function doAlert(s)
{
if(s)
{
alert(s);
rc();
}
}
豆：
private boolean enabled;
public void enableButton() {
enabled = true;
}
public boolean isEnabled() {
return enabled;
}