使用jQuery中的$.ajax进行即时验证

来源：互联网发布：r语言和c语言哪个难编辑：程序博客网时间：2024/05/16 07:47

使用jQuery和一般处理程序即时验证用户录入的学号是否重复，当光标离开输入框即给出提示。

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AddStudent.aspx.cs" Inherits="AddStudent" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        .clsShow
        {
            font-size: 13px;
            border: solid 1px #cc3300;
            padding: 2px;
            display: none;
            margin-bottom: 5px;
            background-color: #ffe0a3;
        }

    </style>
    <script type="text/javascript" src="Scripts/jquery-1.4.2.js"></script>
    <script type="text/javascript">
        $(function () {
            $("#btnSave").click(function () {
                if ($(".clsShow").html().toString() != "")//存在提示信息，则不允许提交表单
                    return false;
                else
                    return true;
            });
            $("#txtNum").focus(); //输入焦点
            $("#txtNum").keydown(function (event) {
                if (event.which == "13") {//回车键,移动光标到密码框
                    $("#txtName").focus();
                    $("#txtNum").trigger("blur");
                }
            });
            $("#txtNum").blur(function () {
                //获取学号
                var strTxtName = encodeURI($("#txtNum").val());
                //开始发送数据
                $.ajax
                ({ //请求验证学号是否重复
                    url: "Check.ashx",
                    type: "post",
                    //传送请求数据
                    data: { txtNum: strTxtName },
                    success: function (strValue) { //登录成功后返回的数据
                        //根据返回值进行状态显示
                        if (strValue == "True") {//注意是True,不是true
                            $(".clsShow").css("display", "inline");
                            $(".clsShow").html("学号已存在，请修改！");
                        }
                        else {
                            $(".clsShow").hide(); //就是把display属性变成none
                            $(".clsShow").html("");
                        }
                    }
                })
            })
        })
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>

        学号:<asp:TextBox
            ID="txtNum" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
            ControlToValidate="txtNum" ErrorMessage="不能为空"></asp:RequiredFieldValidator>
        <div class="clsShow"></div>
        <br />
        姓名:<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
            ControlToValidate="txtName" ErrorMessage="不能为空"></asp:RequiredFieldValidator>
        <br />
        数学:<asp:TextBox
            ID="txtMath" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
            ControlToValidate="txtMath" ErrorMessage="不能为空"></asp:RequiredFieldValidator>
        <asp:RangeValidator ID="RangeValidator1" runat="server"
            ControlToValidate="txtMath" ErrorMessage="分数在0-100之间" MaximumValue="100"
            MinimumValue="0" Type="Integer"></asp:RangeValidator>
        <br />
        英语:<asp:TextBox ID="txtEnglish" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
            ControlToValidate="txtEnglish" ErrorMessage="不能为空"></asp:RequiredFieldValidator>
        <asp:RangeValidator ID="RangeValidator2" runat="server"
            ControlToValidate="txtEnglish" ErrorMessage="分数在0-100之间" MaximumValue="100"
            MinimumValue="0" Type="Integer"></asp:RangeValidator>
        <br />
        语文:<asp:TextBox ID="txtChinese" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server"
            ControlToValidate="txtChinese" ErrorMessage="不能为空"></asp:RequiredFieldValidator>
        <asp:RangeValidator ID="RangeValidator3" runat="server"
            ControlToValidate="txtChinese" ErrorMessage="分数在0-100之间" MaximumValue="100"
            MinimumValue="0" Type="Integer"></asp:RangeValidator>
        <br />
        <asp:Button ID="btnSave" runat="server" Text="保存" onclick="btnSave_Click" />
        <asp:Button ID="btnBack" runat="server" Text="返回" CausesValidation="False"
            onclick="btnBack_Click" />
        <asp:Label ID="lblMsg" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

一般处理程序Check.ashx代码：

<%@ WebHandler Language="C#" class="Check" %>

using System;
using System.Web;

public class Check : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string num = context.Request["txtNum"].ToString();
        bool result = false;
        if(num=="12")//为了简化代码，没有访问数据库。实际项目应查询数据库。
        {
            result = true;
        }
        context.Response.Write(result);
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}

拣尽寒枝不肯栖，寂寞沙洲。

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