创建自滚动的DataGrid

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创建自滚动的DataGrid
作者:孟宪会 出自:【孟宪会之精彩世界】 发布日期:2003年6月9日 4点33分44秒

在使用DataGrid时,如果页面很长,可能需要用户自己来拉动滚动条,下面的例子实现了自动滚动的功能。其基本原理就是利用了LinkButton的锚点的功能,如果使用PushButton,那还必须自己添加锚点。另外必须弄明白的是Page的PostBack时的客户端脚本:

<script language="javascript"> <!-- function __doPostBack(eventTarget, eventArgument) { var theform = document.Form1; theform.__EVENTTARGET.value = eventTarget; theform.__EVENTARGUMENT.value = eventArgument; theform.submit(); } // --> </script>

这段脚本中__doPostBack函数有两个参数:第一个eventTarget是触发PostBack的控件的UniqueID;第二参数eventArgument是一个对象,包含PostBack的额外信息。因此我们使用UniqueID来作为锚点的值。

源代码如下:

查看例子

DataGridAutoScroll.aspx

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="DataGridAutoScroll.aspx.vb" Inherits="aspxWeb.DataGridAutoScroll"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <title runat="server" id="mengxianhui"></title> <meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0"> <meta name="CODE_LANGUAGE" content="Visual Basic 7.0"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body> <form id="Form1" method="post" runat="server"> <asp:DataGrid id="DataGrid1" runat="server" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="4"> <SelectedItemStyle Font-Bold="True" ForeColor="#663399" BackColor="#FFCC66"></SelectedItemStyle> <ItemStyle ForeColor="#330099" BackColor="White"></ItemStyle> <HeaderStyle Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></HeaderStyle> <FooterStyle ForeColor="#330099" BackColor="#FFFFCC"></FooterStyle> <Columns> <asp:EditCommandColumn ButtonType="LinkButton" UpdateText="Update" CancelText="Cancel" EditText="Edit"></asp:EditCommandColumn> </Columns> <PagerStyle HorizontalAlign="Center" ForeColor="#330099" BackColor="#FFFFCC"></PagerStyle> </asp:DataGrid> </form> </body> </HTML>

代码:DataGridAutoScroll.aspx.vb

Imports System Imports System.Web Imports System.Web.UI.WebControls Imports System.Collections Imports System.Data Imports System.Data.SqlClient Public Class DataGridAutoScroll Inherits System.Web.UI.Page Protected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid Protected mengxianhui As New HtmlGenericControl() #Region " Web Form Designer Generated Code " <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init InitializeComponent() End Sub #End Region Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load mengxianhui.InnerText = "【孟宪会之精彩世界】之.NET开发者园地" If Not Page.IsPostBack Then DataGrid1.DataSource = CreateDataSource() DataGrid1.DataBind() Else Dim startUpScript As String startUpScript = "<script language=Javascript>location.href='#" _ & Request.Form("__EVENTTARGET") & "';</script>" Me.RegisterStartupScript(Me.UniqueID & "StartUp", startUpScript) End If End Sub Function CreateDataSource() As ICollection Dim dt As DataTable Dim dr As DataRow Dim i As Integer '创建 DataTable dt = New DataTable() dt.Columns.Add(New DataColumn("字符型值", GetType(String))) dt.Columns.Add(New DataColumn("布尔型值", GetType(Boolean))) dt.Columns.Add(New DataColumn("货币型值", GetType(Double))) '示例数据 For i = 1 To 150 dr = dt.NewRow() dr(0) = "Item " + i.ToString() If (i Mod 2 <> 0) Then dr(1) = True Else dr(1) = False End If dr(2) = 1.23 * (i + 1) '向datatable添加 row dt.Rows.Add(dr) Next '返回DataTable的DataView CreateDataSource = New DataView(dt) End Function Private Sub DataGrid1_ItemDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemDataBound Select Case e.Item.ItemType Case ListItemType.Item, ListItemType.AlternatingItem Dim editButton As LinkButton = New LinkButton() editButton = CType(e.Item.Cells(0).Controls(0), LinkButton) editButton.Attributes.Add("name", "#" & editButton.UniqueID) Case ListItemType.EditItem Dim UpdateButton As LinkButton = New LinkButton() UpdateButton = CType(e.Item.Cells(0).Controls(0), LinkButton) UpdateButton.Attributes.Add("name", "#" & UpdateButton.UniqueID) End Select End Sub Private Sub DataGrid1_EditCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.EditCommand DataGrid1.EditItemIndex = e.Item.ItemIndex DataGrid1.DataSource = CreateDataSource() DataGrid1.DataBind() End Sub Private Sub DataGrid1_CancelCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.CancelCommand DataGrid1.EditItemIndex = -1 DataGrid1.DataSource = CreateDataSource() DataGrid1.DataBind() End Sub Private Sub DataGrid1_UpdateCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.UpdateCommand DataGrid1.EditItemIndex = -1 DataGrid1.DataSource = CreateDataSource() DataGrid1.DataBind() End Sub End Class

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