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在ASP.NET中跨页面实现多选

发布时间:2019-09-13 20:58:01

本文介绍如何在ASP.NET中实现多页面选择的问题。其具体思路很简单:用隐藏的INPUT记住每次选择的项目,在进行数据绑定时,检查保存的值,再在DataGrid中进行选中显示。下面时完整的代码和例子:

查看例子

SelectMultiPages.aspx

<%@ Page EnableViewState="true" CodeBehind="SelectMultiPages.aspx.cs" Language="c#"

AutoEventWireup="false" Inherits="eMeng.Exam.SelectMultiPages" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<title>跨页面实现多选</title>

<META http-equiv="content-type" content="text/html; charset=gb2312">

<style>

* {FONT-SIZE:12PX}

#Status {text-align:left}

</style>

<script language="JAVASCRIPT">

function AddRemoveValues(oChk) {

//在处理这个地方需要注意的是:你保存的值应该具有唯一性,这样才能不会替换错误的项。

if(oChk.checked)

SelectMultiPage.HdnSelectedValues.value += "," + oChk.value;

else

SelectMultiPage.HdnSelectedValues.value = SelectMultiPage.HdnSelectedValues.value.replace("," + oChk.value,"");

}

</script>

</HEAD>

<BODY>

<form id="SelectMultiPage" runat="server">

<asp:datagrid id="DataGrid1" HorizontalAlign="Center" AutoGenerateColumns="False" Width="600px"

AllowPaging="True" runat="server">

<AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle>

<HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center"></HeaderStyle>

<PagerStyle HorizontalAlign="Right" Mode="NumericPages" Visible="True"></PagerStyle>

<Columns>

<asp:TemplateColumn HeaderText="选择">

<ItemTemplate>

<input type="checkbox" runat="server" id="chkSelect" onclick="AddRemoveValues(this)"

value='<%#DataBinder.Eval(Container.DataItem,"Title")%>'/>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="文章标题">

<ItemTemplate>

<asp:Literal Text='<%# DataBinder.Eval(Container.DataItem, "Title") %>' runat="server" ID="TitleShow"/>

</ItemTemplate>

</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="发布时间">

<ItemTemplate>

<asp:Literal Text='<%# DataBinder.Eval(Container.DataItem, "CreateDate").ToString() %>' runat="server"/>

</ItemTemplate>

</asp:TemplateColumn>

</Columns>

</asp:datagrid>

<div align=center>

<asp:button id="Button1" runat="server" Text="得到所选的值"></asp:button>

<div id="Status">

<asp:label id="Label1" runat="server"></asp:label>

</div>

<INPUT id="HdnSelectedValues" type="hidden" name="HdnSelectedValues" runat="server">

</div>

</form>

</BODY>

</HTML>

SelectMultiPages.aspx.cs

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Data.OleDb;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace eMeng.Exam

{

/// <summary>

/// SelectMultiPages 的摘要说明。

/// </summary>

public class SelectMultiPages : System.Web.UI.Page

{

protected System.Web.UI.WebControls.Button Button1;

protected System.Web.UI.WebControls.Label Label1;

protected System.Web.UI.HtmlControls.HtmlInputHidden HdnSelectedValues;

protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

if(!Page.IsPostBack)

BindData();

}

private void DataGrid1_PageIndexChanged(object source, DataGridPageChangedEventArgs e)

{

DataGrid1.CurrentPageIndex = e.NewPageIndex;

BindData();

}

void BindData()

{

OleDbConnection cn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="

+ HttpContext.Current.Server.MapPath("aspx.mdb"));

OleDbDataAdapter da = new OleDbDataAdapter("Select Title, CreateDate from Document",cn);

DataSet ds = new DataSet();

da.Fill(ds);

DataGrid1.DataSource= ds;

DataGrid1.DataBind();

}

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)

{

//重新显示所选择的项目

if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

{

if(HdnSelectedValues.Value.IndexOf(((Literal)e.Item.Cells[1].FindControl("TitleShow")).Text) >= 0 )

{

HtmlInputCheckBox ChkSelected = (HtmlInputCheckBox)(e.Item.Cells[0].FindControl("ChkSelect"));

ChkSelected.Checked = true;

}

}

}

private void Button1_Click(object sender, System.EventArgs e)

{

//为了显示的方便进行替换的

Label1.Text = HdnSelectedValues.Value.Replace(",","<li>");

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

//

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

//

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.DataGrid1.ItemDataBound +=

new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);

this.DataGrid1.PageIndexChanged +=

new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);

this.Button1.Click += new System.EventHandler(this.Button1_Click);

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

}

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