📄 register.jsp
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<%@ page language="java" pageEncoding="GB18030"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<html>
<head>
<title>register</title>
<script type='text/javascript' src='<%=request.getContextPath()%>/dwr/engine.js'> </script>
<script type='text/javascript' src='<%=request.getContextPath()%>/dwr/util.js'> </script>
<script type='text/javascript' src='<%=request.getContextPath()%>/dwr/interface/myuserDAO.js'> </script>
<script type='text/javascript' src='<%=request.getContextPath()%>/dwr/interface/myuser.js'> </script>
<!-- 在dwr.xml中定义了名为Demo的JavaScript -->
<script type="text/javascript">
function checkPassword()
{
var name = dwr.util.getValue("userName");
var word = dwr.util.getValue("password");
myuser = {userName:name,password:word};
myuserDAO.checkRegisterPassword
(myuser,
function(data)
{
if(data=="密码有效，请提交")
{
document.registerForm.submit.focus();
}
else
{
document.registerForm.password.value="";
document.registerForm.password.focus();
}
dwr.util.setValue("passwordMessage",data);
}
);
}
function checkUserName()
{
var name = dwr.util.getValue("userName");
myuser = {userName:name};
myuserDAO.checkRegisterName
(myuser,
function(data)
{
if(data=="用户名有效")
{
document.registerForm.password.focus();
}
else
{
document.registerForm.userName.value="";
document.registerForm.userName.focus();
}
dwr.util.setValue("nameMessage",data);
}
);
}
/* DWR是异步的，所以浏览器不会因为我们等待在后台的HTTP请求返回而阻塞在那里。所以我们要指定一个callback函数，在请求返回的时候自动调用。这里的function(data)就是这个callback函数*/
/* dwr.util提供了一些如getValue和setValue的函数方便我们操作页面元素 */
</script>
</head>
<body>
<html:form action="/register.do" method="post">
userName :
<html:text property="userName"/>
<span id="nameMessage" style="width:200px ; height:10px;"></span><br/>
<br><br>
password :
<html:password property="password" onfocus="checkUserName();"/><span id="passwordMessage" style="width:200px ; height:10px;"></span><br/>
<html:submit property="submit" onfocus="checkPassword();"/><html:cancel/>
</html:form>
</body>
</html>
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