ASP.NET GirdView实现折叠式效果
来源：互联网 发布：征信大数据是什么意思 编辑：程序博客网 时间：2024/04/28 07:47
我们线看图的效果：
但是有个非常不爽的地方，就是GridView要进行回发操作，所以，点击或者展开折叠节点，都会进行数据的回发。
实现的原理是这样的，首先看一下绑定到GridView的datatable数据表格：
可以看到本数据集的构造方式，即parentID下面保存的都是父ID的节点，而ChildID为空；但是当某行数据为子类时，父类的 ParentID置空，而ChildID则存入子类ID值。这样，把这个数据集赋值给GridView的时候，稍微处理就可以达到开始的图片效果了，具体操作如下：
首先，需要在GridView的首列添加两个ImageButton按钮，分别为“MinBT”（-）和“PluseBT”（+），还包括一个 image标签。然后就是在RowCreated的时候，将GridView的行值赋值给imagebutton的commandargument属性，同时将datatable中数据的前两行ParentID和ChildID隐藏掉，具体代码如下：
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.Header) { e.Row.Cells[1].Visible = false; e.Row.Cells[2].Visible = false; } if (e.Row.RowType == DataControlRowType.DataRow) { e.Row.Cells[1].Visible = false; e.Row.Cells[2].Visible = false; ImageButton btnMin = (ImageButton)e.Row.Cells[0].FindControl("MinBT"); btnMin.CommandArgument = e.Row.RowIndex.ToString(); ImageButton btnAdd = (ImageButton)e.Row.Cells[0].FindControl("PluseBT"); btnAdd.CommandArgument = e.Row.RowIndex.ToString(); } } 然后，就是对按钮进行处理了，让有子节点的父类显示“+”按钮，而让没有子节点的父类显示“-”按钮，这需要在GridView1_RowDataBound事件中处理，具体代码如下：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { string ShowHide = e.Row.Cells[1].Text; ShowHide = ShowHide.Replace(" ", ""); ShowHide = ShowHide.Replace(" ",""); if (ShowHide.Trim().Length == 0) //如果有子类，前面就会有空白，替换掉后，长度为0，反之则不为0 { ImageButton btnMin = (ImageButton)e.Row.Cells[0].FindControl("MinBT"); btnMin.Visible = false; //不显示已展开按钮 ImageButton btnAdd = (ImageButton)e.Row.Cells[0].FindControl("PluseBT"); btnAdd.Visible = false; //不显示可展开按钮 HtmlImage Line = (HtmlImage)e.Row.Cells[0].FindControl("Line"); Line.Visible = true; //显示虚线框 } else { HtmlImage Line = (HtmlImage)e.Row.Cells[0].FindControl("Line"); Line.Visible = false; //反之，则不现实虚线框 } } }然后就是处理按钮的点击事件了：
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandName == "_Show") //当点击展开按钮时 { int index = Convert.ToInt32(e.CommandArgument); //获取第几行 GridViewRow row = GridView1.Rows[index]; int G_Count = GridView1.Rows.Count; //查出总行数 for (int i = index + 1; i < G_Count; i++) //从本行下面一行开始 { if (GridView1.Rows[i].Cells[1].Text == " ") //如果遇见是子类 { GridView1.Rows[i].Visible = true; //那么本行显示 } else //如果遇见的不是子类 { ImageButton Bt_Min = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min.Visible = true; //那么已展开按钮显示 ImageButton Bt_plus = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus.Visible = false; //未展开按钮隐藏 break; } ImageButton Bt_Min1 = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min1.Visible = true; ImageButton Bt_plus1 = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus1.Visible = false; } } if (e.CommandName == "_Hide") { int index = Convert.ToInt32(e.CommandArgument); GridViewRow row = GridView1.Rows[index]; int G_Count = GridView1.Rows.Count; for (int i = index + 1; i < G_Count; i++) { if (GridView1.Rows[i].Cells[1].Text == " ") { GridView1.Rows[i].Visible = false; } else { ImageButton Bt_Min = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min.Visible = false; ImageButton Bt_plus = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus.Visible = true; break; } ImageButton Bt_Min1 = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min1.Visible = false; ImageButton Bt_plus1 = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus1.Visible = true; } }所有代码如下：
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data;using System.Data.SqlClient;using System.Web.UI.HtmlControls;public partial class Default2 : System.Web.UI.Page{ public string connStr = System.Configuration.ConfigurationManager.AppSettings["connStr"]; protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { using (SqlConnection conn = new SqlConnection(connStr)) { conn.Open(); string sql = "SELECT ParentName,ParentID,dateof FROM TreeParent tp "; SqlCommand cmd = new SqlCommand(sql, conn); DataTable dt = new DataTable(); dt.Columns.Add(new DataColumn("ParentID", typeof(string))); dt.Columns.Add(new DataColumn("ChildID", typeof(string))); dt.Columns.Add(new DataColumn("Name", typeof(string))); dt.Columns.Add(new DataColumn("Dateof", typeof(string))); SqlDataReader sdr = cmd.ExecuteReader(); while (sdr.Read()) { DataRow dr = dt.NewRow(); int pID = Convert.ToInt32(sdr["ParentID"]); dr["ParentID"] = (sdr["ParentID"]); dr["ChildID"] = null; dr["Name"] = sdr["ParentName"]; dr["Dateof"] = sdr["Dateof"]; dt.Rows.Add(dr); DataTable myDT = GenerateDT(pID.ToString()); foreach (DataRow drChild in myDT.Rows) { DataRow drChildDT = dt.NewRow(); drChildDT["ChildID"] = drChild["ChildID"]; drChildDT["Name"] = drChild["ChildName"]; drChildDT["Dateof"] = drChild["Dateof"]; dt.Rows.Add(drChildDT); } } sdr.Close(); GridView1.DataSource = dt; GridView1.DataBind(); } } } protected DataTable GenerateDT(string ParentID) { using (SqlConnection conn = new SqlConnection(connStr)) { conn.Open(); DataTable dt = new DataTable(); dt.Columns.Add(new DataColumn("ChildName", typeof(string))); dt.Columns.Add(new DataColumn("ChildID", typeof(string))); dt.Columns.Add(new DataColumn("Dateof", typeof(string))); string sql = "SELECT childID,childName,dateof FROM TreeChild tc where tc.ParentID=" + ParentID; SqlCommand cmd = new SqlCommand(sql, conn); SqlDataReader sdr = cmd.ExecuteReader(); while (sdr.Read()) { DataRow dr = dt.NewRow(); dr["ChildName"] = sdr["childName"]; dr["ChildID"] = sdr["ChildID"]; dr["Dateof"] = sdr["Dateof"]; dt.Rows.Add(dr); } sdr.Close(); return dt; } } protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.Header) { e.Row.Cells[1].Visible = false; e.Row.Cells[2].Visible = false; } if (e.Row.RowType == DataControlRowType.DataRow) { e.Row.Cells[1].Visible = false; e.Row.Cells[2].Visible = false; ImageButton btnMin = (ImageButton)e.Row.Cells[0].FindControl("MinBT"); btnMin.CommandArgument = e.Row.RowIndex.ToString(); ImageButton btnAdd = (ImageButton)e.Row.Cells[0].FindControl("PluseBT"); btnAdd.CommandArgument = e.Row.RowIndex.ToString(); } } protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { string ShowHide = e.Row.Cells[1].Text; ShowHide = ShowHide.Replace(" ", ""); ShowHide = ShowHide.Replace(" ",""); if (ShowHide.Trim().Length == 0) { ImageButton btnMin = (ImageButton)e.Row.Cells[0].FindControl("MinBT"); btnMin.Visible = false; ImageButton btnAdd = (ImageButton)e.Row.Cells[0].FindControl("PluseBT"); btnAdd.Visible = false; HtmlImage Line = (HtmlImage)e.Row.Cells[0].FindControl("Line"); Line.Visible = true; } else { HtmlImage Line = (HtmlImage)e.Row.Cells[0].FindControl("Line"); Line.Visible = false; } } } protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandName == "_Show") { int index = Convert.ToInt32(e.CommandArgument); GridViewRow row = GridView1.Rows[index]; int G_Count = GridView1.Rows.Count; for (int i = index + 1; i < G_Count; i++) { if (GridView1.Rows[i].Cells[1].Text == " ") { GridView1.Rows[i].Visible = true; } else { ImageButton Bt_Min = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min.Visible = true; ImageButton Bt_plus = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus.Visible = false; break; } ImageButton Bt_Min1 = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min1.Visible = true; ImageButton Bt_plus1 = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus1.Visible = false; } } if (e.CommandName == "_Hide") { int index = Convert.ToInt32(e.CommandArgument); GridViewRow row = GridView1.Rows[index]; int G_Count = GridView1.Rows.Count; for (int i = index + 1; i < G_Count; i++) { if (GridView1.Rows[i].Cells[1].Text == " ") { GridView1.Rows[i].Visible = false; } else { ImageButton Bt_Min = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min.Visible = false; ImageButton Bt_plus = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus.Visible = true; break; } ImageButton Bt_Min1 = (ImageButton)row.Cells[0].FindControl("MinBT"); Bt_Min1.Visible = false; ImageButton Bt_plus1 = (ImageButton)row.Cells[0].FindControl("PluseBT"); Bt_plus1.Visible = true; } } }}前台代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %><!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></head><body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" onrowcommand="GridView1_RowCommand" onrowcreated="GridView1_RowCreated" onrowdatabound="GridView1_RowDataBound" Width="456px"> <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> <Columns> <asp:TemplateField HeaderText="操作"> <ItemTemplate> <asp:ImageButton ID="PluseBT" runat="server" Visible="false" CommandName="_Show" BackColor="White" BorderStyle="none" ImageUrl="~/plus.gif" /> <asp:ImageButton ID="MinBT" runat="server" CommandName="_Hide" BackColor="White" BorderStyle="none" ImageUrl="~/minus.gif" /> <img id="Line" runat="server" visible="false" src="~/line.gif"/> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="ParentID" HeaderText="Parent Id" /> <asp:BoundField DataField="ChildId" HeaderText="Child Id" /> <asp:BoundField DataField="Name" HeaderText="名称" /> <asp:BoundField DataField="Dateof" HeaderText="时间" /> </Columns> <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /> <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> <EditRowStyle BackColor="#999999" /> <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> </asp:GridView> </div> </form></body></html>
- ASP.NET GirdView实现折叠式效果
- ASP.NET GirdView实现折叠式效果
- ASP.NET GirdView
- Jquery实现导航菜单折叠式效果
- ASP.NET中的GirdView与超链接
- Asp.net girdview 导出.csv格式
- ASP.NET中GirdView控件的详解
- ASP.NET GirdView后台动态绑定数据
- asp.net实现分页效果
- 关于asp.net 中girdview换行的问题
- asp.net Girdview 批量删除错误的原因
- Girdview实现滚动条效果，并且Head部分不滚动
- JS 实现折叠式菜单
- 使用ASP.NET AJAX实现幻灯片效果
- Asp.net"页面加载中"效果实现
- Asp.net"页面加载中"效果实现
- Asp.net"页面加载中"效果实现
- asp.net实现jsp中servlet效果
- jquery 常用方法
- Android中的【Cursor】类总结
- VB 解决在循环中界面不更新
- zend配置SVN
- C#调用存储过程简单完整例子
- ASP.NET GirdView实现折叠式效果
- 求浮点数数组A={A1,A2,A3,…,An}中，Aj-Ai（j>i）的最大值。要求时间复杂度越小越好
- js实现div拖动
- Android ANR
- CentOS 5 上安装git
- Solaris磁阵挂载
- vb、asp和html中调用c#类库生成的dll文件所遇问题解决方案
- 分布式版本控制系统 Git
- Eclipse配色插件---Eclipse Color Theme，支持多种颜色配置
