<!-- ajax判断用户名是否存在 -->
<script language="JavaScript" type="text/javascript">
var request = false;
try{
request = new XMLHttpRequest();
}catch(microsoftIE){
try{
request = new ActiveXObject("Msxml2.XMLHTTP");
}catch(microsoftOldIE){
try{
request = new ActiveXObject("Microsoft.XMLHTTP");
}catch(failed){
request = false;
}
}
}
if(!request){
alert("初始化XMLHttpRequest对象失败");
}
function sendUsername(){
var username = document.getElementById("userid").value;
if(username!=null && username!=""){
var url = "userManageAction!getAdd.action?username="+escape(username);//能不能这样写,怎么把得到的url里面username传到Action里面
alert(url);
request.open("post",url,true);
request.onreadystatechange=updatepage;
request.send(null);
}
}
function updatepage(){
if(request.readyState==4){
if(request.status==200){
document.getElementById("reusername").innerHTML = request.responseText;
//document.getDocumentById("reusername").innerText = request.responseText;
}else if(request.status==404){
alert("找不到页面!");
}else{
alert("错误代码:"+request.status);
}
}
}
function clearMessage(){
document.getElementById("reusername").innerHTML = "";
}
</script>
Action代码,不知道是不是这样写(struts2框架) // 判断用户名是否已经存在
if(userManage.getName() != null){
namelist = userManageService.exist(userManage);
for(int i=0;i<namelist.size();i++){
UserManageVo umv = (UserManageVo)namelist.get(i);
if(userManage.getName().equals(umv.getName())){
this.addActionError("<font color='red'>用户名已经注册</font>");
}else {
this.addActionError("<font color='green'>用户名可以用</font>");
}
}
}
<script language="JavaScript" type="text/javascript">
var request = false;
try{
request = new XMLHttpRequest();
}catch(microsoftIE){
try{
request = new ActiveXObject("Msxml2.XMLHTTP");
}catch(microsoftOldIE){
try{
request = new ActiveXObject("Microsoft.XMLHTTP");
}catch(failed){
request = false;
}
}
}
if(!request){
alert("初始化XMLHttpRequest对象失败");
}
function sendUsername(){
var username = document.getElementById("userid").value;
if(username!=null && username!=""){
var url = "userManageAction!getAdd.action?username="+escape(username);//能不能这样写,怎么把得到的url里面username传到Action里面
alert(url);
request.open("post",url,true);
request.onreadystatechange=updatepage;
request.send(null);
}
}
function updatepage(){
if(request.readyState==4){
if(request.status==200){
document.getElementById("reusername").innerHTML = request.responseText;
//document.getDocumentById("reusername").innerText = request.responseText;
}else if(request.status==404){
alert("找不到页面!");
}else{
alert("错误代码:"+request.status);
}
}
}
function clearMessage(){
document.getElementById("reusername").innerHTML = "";
}
</script>
Action代码,不知道是不是这样写(struts2框架) // 判断用户名是否已经存在
if(userManage.getName() != null){
namelist = userManageService.exist(userManage);
for(int i=0;i<namelist.size();i++){
UserManageVo umv = (UserManageVo)namelist.get(i);
if(userManage.getName().equals(umv.getName())){
this.addActionError("<font color='red'>用户名已经注册</font>");
}else {
this.addActionError("<font color='green'>用户名可以用</font>");
}
}
}
没看明白userManageAction是页面?action是方法?getAdd是什么?
是个类.
别人的列子上是跳到jsp页面. var url = "./judgeUsername.jsp?username="+escape(username);judgeUsername.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%
String username = request.getParameter("userManage.name");
//System.out.println("username:"+username);
if(username.equals("guoyongfei")){
out.println("<font color='red'>用户名已经注册</font>");
}else{
out.println("<font color='green'>用户名可以用</font>");
}
%>现在把它改到java类里面.
这个是struts2中自带的方面.