XMLHttpRequest无刷新更新页面

最新推荐文章于 2021-04-01 01:01:19 发布

原创最新推荐文章于 2021-04-01 01:01:19 发布 · 883 阅读

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CC 4.0 BY-SA版权

文章标签：

#xmlhttprequest #asp #function #xhtml #string #server

本文介绍了一个使用ASP.NET和AJAX实现动态内容加载的例子。通过RadioButtonList的选择触发AJAX请求，获取并显示相应内容。

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default17.aspx.cs" Inherits="Default17" %>

<!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 id="Head1" runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
    var xmlHttp;

    function createXMLHttpRequest()
    {
        if (window.ActiveXObject)
        {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else if (window.XMLHttpRequest)
        {
            xmlHttp = new XMLHttpRequest();
        }
    }

function startRequest()
{
//debugger;
var ProvinceID=document.all("RadioButtonList1");
var pv;
for(i=0;i<ProvinceID.length;i++)
{
    if(ProvinceID[i].checked)
    {
        pv=ProvinceID[i].value;
    }
}
createXMLHttpRequest();
xmlHttp.onreadystatechange = handleStateChange;

xmlHttp.open("GET", "?ProvinceID=" +pv, true);
xmlHttp.send(null);
}

function handleStateChange()
{
if(xmlHttp.readyState == 4) //0(????);1(????);2 (????);3 (???);4 (??)
{
if(xmlHttp.status == 200) //200(OK);404(not found)
{
document.getElementById("gridiv").innerHTML=xmlHttp.responseText;
}
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem>A</asp:ListItem>
    <asp:ListItem>B</asp:ListItem>
    <asp:ListItem>C</asp:ListItem>
    <asp:ListItem></asp:ListItem>
</asp:DropDownList>
</div>
<div id ="gridiv"></div>
    <asp:RadioButtonList ID="RadioButtonList1" runat="server">
        <asp:ListItem>A</asp:ListItem>
        <asp:ListItem>B</asp:ListItem>
        <asp:ListItem>C</asp:ListItem>
    </asp:RadioButtonList>
</form>
</body>
</html>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default17 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            this.RadioButtonList1.Attributes.Add("onclick", "return startRequest();");

            if (ProvinceID != "")
            {
                GetCityByProvinceID(ProvinceID);
            }
        }
    }

    //property
    #region property
    private string ProvinceID
    {
        get
        {
            if (Request["ProvinceID"] != null && Request["ProvinceID"].ToString() != "")
            {
                return Request["ProvinceID"];
            }
            else
            {
                return "";
            }
        }
    }
    #endregion

    //GetCityByProvinceID
    #region GetCityByProvinceID
    private void GetCityByProvinceID(string ProvinceID)
    {
        this.Response.Write(ProvinceID);
        this.Response.End();
    }
    #endregion

}