Struts2 Ajax Jquery 验证用户名

JS：

<script type="text/javascript" src="<%=basePath%>js/jquery.js"></script>
<script type="text/javascript">
    $(document).ready(
       function(){
         $("#uname").blur(    //添加文本框失去焦点事件
            function(){
            var uname=$("#uname").val();      //获取文本框的值
             $.ajax({                         //获取 ajax
             type:'get',                      //请求方式
             url:'<%=basePath%>login.action', //发送给哪个Action
             data:"uname="+uname,             //发送uname给Action
             success:function(data){          //执行成功后的函数 data参数有Action返回自动赋值
                 if(data=="success")          //如果返回值为success
                 {
                      $("#nameMessage").html("验证成功");   //在span标签显示验证成功
                 }else{
                      $("#nameMessage").html("验证失败");
                 }
             }
            });
        })
    });
</script>

JSP：

<body>
    <form action="<%=basePath%>login.action">
        <p>
            <input type="text" name="uname" id="uname">
        </p>
        <p>
            <input type="text" name="upwd" id="upwd">
        </p>
        <span id="nameMessage"></span>
    </form>
</body>

Action：

public class LoginAction extends ActionSupport {

    private String uname;
    private String upwd;

    @Override
    public String execute() throws Exception {
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        if ("lwq".equals(uname)) {
            out.print("error");
        } else {
            out.print("success"); //最后由ajax中data自动接收
        }
        out.close();
        return null;
    }

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    public String getUpwd() {
        return upwd;
    }

    public void setUpwd(String upwd) {
        this.upwd = upwd;
    }

 

posted @ 2019-05-04 21:01  WhiteTester  阅读(202)  评论(0)  编辑  收藏  举报