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ajax实例:XMLHttpRequest打造注册页

 烈火建站学院(LieHuo.Net)文档 看了好久的ajax,自己动手做的例子却很少,今天决定自己动手写一个,功能很简单,实现一个简单的用户名注册功能,同时对用户输入在服务器端进行简单校验,没有用数据库保存用户名,这里利用application·对象模拟。做了好久才弄好,遇到了很多问题,最后得以解决,比较有意思的地方是当我写完例子后,在firefox下运行正常,但是在ie下有点问题,注册过的用户名还是显示注册成功,查了好久没有搞出原因,最后又复习了以前看过的一个视频教程,才知道是IE的缓存造成的,用了一个小技巧欺骗ie一下,就可以轻松搞定!感觉收获挺大的!

 下面是代码:

 注册页面html代码:


提示:可修改后代码再运行!

 服务器端asp代码:

以下为引用的内容:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%
String type = request.getParameter("type");
if (type.equals("username")) {
String username = request.getParameter("username");

if (username != null && username.length() > 0) {
if (application.getAttribute(username) != null) {

out.println("Username is exist!");
} else {
out.println("Username is OK!");
}


} else {
out.println("Username is need!");
}

} else if(type.equals("password")) {
String password = request.getParameter("password");
if(password != null && password.length() > 0) {
out.println("password is ok");

} else {
out.println("Password is need!");

}

} else if (type.equals("password2")) {
String password2 = request.getParameter("password2");
if(password2 != null && password2.length() > 0) {
String password = request.getParameter("password");
if( password2.equals(password)) {
out.println("Password2 is OK!");
} else {

out.println("Password2 is not equal Password!");
}

} else {
out.println("Password2 is need!");

}

} else if (type.equals("submit")) {

boolean regFlag = true;

String username = request.getParameter("username");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");

if (username != null && username.length() > 0) {

if (username != null && username.length() > 0) {
if (application.getAttribute(username) != null) {
regFlag = false;
out.println("username is exist!");
}
}

} else {
out.println("Username is needed!<br/>");
regFlag = false;
}

if(password != null && password.length() > 0) {

} else {
out.println("Password is need!<br/>");
regFlag = false;

}
if(password2 != null && password2.length() > 0) {

if( password2.equals(password)) {

} else {

out.println("Password2 is not equal Password!<br/>");
regFlag = false;
}

} else {
out.println("Password2 is need!<br/>");
regFlag = false;

}
if (regFlag == true) {
application.setAttribute(username,username);

out.println("Register is successful!");

}

}
%>

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