扩展GridView控件（六）——数据行响应鼠标的单击和双击事件

GridView既强大又好用。为了让它更强大、更好用，我们来写一个继承自GridView的控件。
[源码下载]
http://files.cnblogs.com/webabcd/yycontrols.rar

介绍
为了让GridView的数据行可以响应鼠标的单击和双击事件，一般我们会在GridView的RowDataBound事件中给<tr>加上客户端代码，为了简化这个步骤，我们来扩展一下它。

控件开发
1、新建一个继承自GridView的类。
复制C#代码保存代码/// <summary>
/// 继承自GridView
/// </summary>
[ToolboxData(@"<{0}:SmartGridView runat=\'server\'></{0}:SmartGridView>")]
public class SmartGridView : GridView
{
}
2、加两个属性，分别是单击行事件所对应的按钮的ID和双击行事件所对应的按钮的ID
复制C#代码保存代码private string _rowClickButtonID;
/// <summary>
/// 单击行事件所对应的按钮的ID
/// </summary>
[Description("单击行事件所对应的按钮的ID"), DefaultValue(""), Category("扩展")]
public virtual string RowClickButtonID
{
get { return _rowClickButtonID; }
set { _rowClickButtonID = value; }
}

private string _rowDoubleClickButtonID;
/// <summary>
/// 双击行事件所对应的按钮的ID
/// </summary>
[Description("双击行事件所对应的按钮的ID"), DefaultValue(""), Category("扩展")]
public virtual string RowDoubleClickButtonID
{
get { return _rowDoubleClickButtonID; }
set { _rowDoubleClickButtonID = value; }
}
3、新建一个JavaScriptConstant类，把我们要用到的javascript存在一个常量里
复制C#代码保存代码using System;
using System.Collections.Generic;
using System.Text;

namespace YYControls.SmartGridView
{
/// <summary>
/// javascript
/// </summary>
public class JavaScriptConstant
{
internal const string jsClickAndDoubleClick = @”<script type=”"text/javascript”">
//<![CDATA[
var isDoubleClick = false;
function yy_RowClick(id)
{
setTimeout(""yy_RowClickTimeout(\'""+id+""\')"", 300);
}
function yy_RowClickTimeout(id)
{
if (isDoubleClick == false)
{
// 执行ID所指按钮的click事件
document.getElementById(id).click();
}
isDoubleClick = true;
}
function yy_RowDoubleClick(id)
{
if (isDoubleClick == true)
{
// 执行ID所指按钮的click事件
document.getElementById(id).click();
}
isDoubleClick = true;
}
//]]>
</script>”;
}
}
4、重写OnPreRender方法，注册上面那段客户端脚本
复制C#代码保存代码/// <summary>
/// OnPreRender
/// </summary>
/// <param name=”e”></param>
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);

if (!String.IsNullOrEmpty(RowClickButtonID) || !String.IsNullOrEmpty(RowDoubleClickButtonID))
{
if (!Page.ClientScript.IsClientScriptBlockRegistered(“jsClickAndDoubleClick”))
{
Page.ClientScript.RegisterClientScriptBlock(
this.GetType(),
“jsClickAndDoubleClick”, JavaScriptConstant.jsClickAndDoubleClick
);
}
}
}
5、重写OnRowDataBound以实现数据行响应鼠标的单击和双击事件的功能。主要是给<tr>加上客户端代码，用来调用某个按钮的click事件
复制C#代码保存代码/// <summary>
/// OnRowDataBound
/// </summary>
/// <param name=”e”></param>
protected override void OnRowDataBound(GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
if (!String.IsNullOrEmpty(RowClickButtonID)
|| !String.IsNullOrEmpty(RowDoubleClickButtonID))
{
// GridViewRow的每个TableCell
foreach (TableCell tc in e.Row.Cells)
{
// TableCell里的每个Control
foreach (Control c in tc.Controls)
{
// 如果控件继承自接口IButtonControl
if (c.GetType().GetInterface(“IButtonControl”) != null
&& c.GetType().GetInterface(“IButtonControl”).Equals(typeof(IButtonControl)))
{
if (!String.IsNullOrEmpty(RowClickButtonID))
{
// 该按钮的ID等于单击行所对应的按钮ID
if (c.ID == RowClickButtonID)
{
// 增加行的单击事件，调用客户端脚本，根据所对应按钮的ID执行所对应按钮的click事件
e.Row.Attributes.Add(“onclick“,
“javascript：yy_RowClick(‘” + c.ClientID + “‘)”);
}
}

if (!String.IsNullOrEmpty(RowDoubleClickButtonID))
{
// 该按钮的ID等于双击行所对应的按钮ID
if (c.ID == RowDoubleClickButtonID)
{
// 增加行的双击事件，调用客户端脚本，根据所对应按钮的ID执行所对应按钮的click事件
e.Row.Attributes.Add(“ondblclick”,
“javascript：yy_RowDoubleClick(‘” + c.ClientID + “‘)”);
}
}
}
}
}
}
}

base.OnRowDataBound(e);
}

控件使用
添加这个控件到工具箱里，然后拖拽到webform上，要实现行的单击事件则设置RowClickButtonID为行单击事件所对应的按钮的ID，要实现行的双击事件则设置RowDoubleClickButtonID为行双击事件所对应的按钮的ID。
ObjData.cs
复制C#代码保存代码using System;
using System.Data;
using System.Configuration;
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;

using System.ComponentModel;

/// <summary>
/// OjbData 的摘要说明
/// </summary>
public class OjbData
{
public OjbData()
{
//
// TOD 在此处添加构造函数逻辑
//
}

[DataObjectMethod(DataObjectMethodType.Select, true)]
public DataTable Select()
{
DataTable dt = new DataTable();
dt.Columns.Add(“no”, typeof(string));
dt.Columns.Add(“name”, typeof(string));

for (int i = 0; i < 30; i++)
{
DataRow dr = dt.NewRow();
dr[0] = “no” + i.ToString().PadLeft(2, ’0′);
dr[1] = “name” + i.ToString().PadLeft(2, ’0′);

dt.Rows.Add(dr);
}

return dt;
}
}
Default.aspx
复制ASPX代码保存代码<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” %>

<!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>SmartGridView测试</title>
</head>
<body>
<form id=”form1″ runat=”server”>
<yyc:SmartGridView ID=”SmartGridView1″ runat=”server” AutoGenerateColumns=”False”
DataSourceID=”ObjectDataSource1″ RowClickButtonID=”btnTestRowClick” RowDoubleClickButtonID=”btnTestRowDoubleClick”>
<Columns>
<asp:BoundField DataField=”no” HeaderText=”序号” SortExpression=”no” ItemStyle-Width=”100px” />
<asp:BoundField DataField=”name” HeaderText=”名称” SortExpression=”name” ItemStyle-Width=”100px” />
<asp:BoundField DataField=”no” HeaderText=”序号” SortExpression=”no” ItemStyle-Width=”100px” />
<asp:BoundField DataField=”name” HeaderText=”名称” SortExpression=”name” ItemStyle-Width=”100px” />
<asp:BoundField DataField=”no” HeaderText=”序号” SortExpression=”no” ItemStyle-Width=”100px” />
<asp:BoundField DataField=”name” HeaderText=”名称” SortExpression=”name” ItemStyle-Width=”100px” />
<asp:TemplateField>
<footerstyle cssclass=”hidden” />
<headerstyle cssclass=”hidden” />
<itemstyle cssclass=”hidden” />
<itemtemplate>
<asp:Button id=”btnTestRowClick” runat=”server” CommandName=”RowClick” CommandArgument=’<%# Container.DataItemIndex %>’ />
<asp:Button id=”btnTestRowDoubleClick” runat=”server” CommandName=”RowDoubleClick” CommandArgument=’<%# Container.DataItemIndex %>’ />
</itemtemplate>
</asp:TemplateField>
</Columns>
</yyc:SmartGridView>
<asp:ObjectDataSource ID=”ObjectDataSource1″ runat=”server” SelectMethod=”Select”
TypeName=”OjbData”></asp:ObjectDataSource>
</form>
</body>
</html>

转自【webabcd-.NET】