点击按钮,刷新 GridView 中的数据,而不是这个页面刷新。使用简单的 XMLHttpRequest 就可以直接实现。具体代码如下:
<% @ Page Language ="C#"%> <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat ="server"> System.Data.DataView CreateDataSourceByXianhuiMeng() { System.Data.DataTable dt = new System.Data.DataTable(); System.Data.DataRow dr; dt.Columns.Add( new System.Data.DataColumn("id",typeof (System.Int32))); dt.Columns.Add( new System.Data.DataColumn("学生姓名",typeof (System.String))); dt.Columns.Add( new System.Data.DataColumn("语文",typeof (System.Decimal))); dt.Columns.Add( new System.Data.DataColumn("数学",typeof (System.Decimal))); dt.Columns.Add( new System.Data.DataColumn("英语",typeof (System.Decimal))); dt.Columns.Add( new System.Data.DataColumn("计算机",typeof (System.Decimal))); for ( int i = 1 ; i <30 ; i ++ ) { System.Random rd = new System.Random(Environment.TickCount * i); ; dr = dt.NewRow(); dr[ 0 ] = i; dr[ 1 ] ="【Test】"+ i.ToString(); dr[ 2 ] = System.Math.Round(rd.NextDouble() * 100,2 ); dr[ 3 ] = System.Math.Round(rd.NextDouble() * 100,2 ); dr[ 4 ] = System.Math.Round(rd.NextDouble() * 100,2 ); dr[ 5 ] = System.Math.Round(rd.NextDouble() * 100,2 ); dt.Rows.Add(dr); } System.Data.DataView dv = new System.Data.DataView(dt); return dv; } protected void Page_Load(object sender,EventArgs e) { if (Request.QueryString["id"] != null ) { Response.ClearContent(); GridView1.DataSource = CreateDataSourceByXianhuiMeng(); GridView1.DataBind(); System.Text.StringBuilder sb = new System.Text.StringBuilder(); System.IO.StringWriter sw = new System.IO.StringWriter(sb); HtmlTextWriter htw = new HtmlTextWriter(sw); Literal header = new Literal(); header.Text ="<h2>项目"+ Request.QueryString["id"] +"</h2>"; Header.Controls.Add(header); Header.RenderControl(htw); GridView1.RenderControl(htw); Response.Write("这里查询数据,输出结果就可以了。结果:"+ sb.ToString()); Response.End(); } } // / 添加这个override void VerifyRenderingInServerForm(Control control),是为了避免出现 // / 类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。 // / 的异常 public override void VerifyRenderingInServerForm(Control control) { } </script> <html xmlns ="http://www.w3.org/1999/xhtml"> <head id ="Head1" runat ="server"> <title> 使用 AJAX,局部刷新 GridView 进行数据绑定的简单实现 </title> <script type ="text/javascript"> function GetData(p) { document.getElementById("d").innerHTML ="正在读取数据……"; h = window.XMLHttpRequest ? new window.XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP"); h.open("GET",' <%=Request.FilePath %>?id= ' + p.value,true ); h.onreadystatechange = function () { if (h.readyState == 4 ) { if (h.status >= 200 && h.status <300 ) { document.getElementById("d").innerHTML = h.responseText; } else { document.getElementById("d").innerHTML ="<h2>数据操作错误:</h2>"+ h.responseText; } } } h.send( null ); } alert("这个提示,只出现在第一次打开页面。"); </script> </head> <body> <form id ="form1" runat ="server"> <asp:GridView ID ="GridView1" runat ="server" ></asp:GridView> <asp:Panel ID ="Header" runat ="server" ></asp:Panel> <select onchange ="GetData(this)"> <option value ="1"> 项目一 </option> <option value ="2"> 项目二 </option> </select> </form> <div id ="d" ></div> </body> </html>