1.judgeUsername.html頁面:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
? <head>
??? <title>judegUsername.html</title>
?
??? <meta http-equiv="content-type" content="text/html; charset=UTF-8">
???
??? <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對象失敗");
??? }
??? function sendUsername(){
??? ?var username = document.getElementById("username").value;
??? ?if(username!=null && username!=""){
??? ??var url = "./judgeUsername.jsp?username="+escape(username);
??? ??request.open("get",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("找不到頁面！");
??? ??}else{
??? ???alert("錯誤代碼:"+request.status);
??? ??}
??? ?}
??? }
??? function clearMessage(){
??? ?document.getElementById("reusername").innerHTML = "";
??? }
??? </script>
? </head>
?
? <body>
? ?<form action="/register.jsp" method="post">
??? <table align="center">
??? ?<caption>guoyongfei為已注冊，其他均未注冊</caption>
??? ?<tr><th>用 戶 名：</th><td><input type="text" name="username" id="username" onblur="sendUsername()" onfocus="clearMessage()"/></td><td width="40%" id="reusername"></td></tr>
??? ?<tr><th>密 碼：</th><td><input type="password" name="password" id="password"/></td><td width="20"></td></tr>
??? ?<tr><th>密碼確認：</th><td><input type="surePassword" name="surePassword" id="surePassword"/></td><td width="20"></td></tr>
??? </table>
? </body>
</html>
2.judgeUsername.jsp頁面:
<%@ page language="java" pageEncoding="UTF-8"%>
<%
?String username = request.getParameter("username");
?//System.out.println("username:"+username);
?if(username.equals("guoyongfei")){
??out.println("<font color='red'>用戶名已經注冊</font>");
?}else{
??out.println("<font color='green'>用戶名可以用</font>");
?}
?%>
希望大家給推薦下提示信息較好的表示方法.....
posted on 2008-03-12 17:49
Tiger1102 閱讀(2649)
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