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jQuery+Ajax verify username
- php中世界最好的语言Original
- 2018-05-08 15:57:451509browse
This time I will bring you jQuery Ajax to verify the user name. What are the precautions for jQuery Ajax to verify the user name? The following is a practical case, let's take a look.
HTML<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="/jquery_ajax/js/jquery-1.8.3.js"></script>
<script type="text/javascript">
//页面加载完成后
$(function() {
//添加失焦事件
$("#username").blur(function() {
//获取录入的用户名
var usernamevalue = $("#username").val();
//向服务器发送请求
var url="/jquery_ajax/load";
$("#username_span").load(url,{'username':usernamevalue});
});
});
</script>
</head>
<body>
<input type="text" name="username" id="username"><span id="username_span"></span>
<br>
<input type="password" name="password">
<br>
</body>
</html>Login
public class LoadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 解决乱码
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
// 1.得到用户名
String username = request.getParameter("username");
// 2.判断用户名是否可以使用
if ("tom".equals(username)) {
// 用户名不可以使用
response.getWriter().write("<font color='red'>用户名被占用</font>");
} else {
// 用户名可以使用
response.getWriter().write("<font color='green'>用户名可以使用</font>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}web.xml
<servlet>
<description></description>
<display-name>LoadServlet</display-name>
<servlet-name>LoadServlet</servlet-name>
<!--
Class clazz = Class.forName("com.zxl.servlet.LoadServlet");
Object obj = clazz.newInstatnce();
// 反射去调用 doGet, doPost
-->
<servlet-class>com.zxl.servlet.LoadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoadServlet</servlet-name>
<url-pattern>/load</url-pattern>
</servlet-mapping> I believe you have mastered the method after reading the case in this article. For more exciting content, please pay attention to other related articles on the php Chinese website! Recommended reading:
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