GridView问题

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]

扩展GridView（七）——改变通过CheckBox选中的行的样式

介绍
在GridView中如果每行都有复选框的话，选中了某个复选框则修改该复选框所在行的样式，这是经常要用到的功能，因此我们来扩展一下GridView控件。


控件开发

/**//// <summary>
/// 继承自GridView
/// </summary>
[ToolboxData(@"<{0}:SmartGridView runat='server'></{0}:SmartGridView>")]
public class SmartGridView : GridView
{
}

2、新建一个ChangeRowCSSByCheckBox实体类，有两个属性

using System;
using System.Collections.Generic;
using System.Text;

using System.ComponentModel;

namespace YYControls.SmartGridView
{
    /**//// <summary>
    /// 通过行的CheckBox的选中与否来修改行的样式
    /// 实体类
    /// </summary>
    [TypeConverter(typeof(ExpandableObjectConverter))]
    public class ChangeRowCSSByCheckBox
    {
        private string _checkBoxID;
        /**//// <summary>
        /// 根据哪个ChecxBox来判断是否选中了行，指定该CheckBox的ID
        /// </summary>
        [
        Description("根据哪个ChecxBox来判断是否选中了行，指定该CheckBox的ID"),
        Category("扩展"),
        DefaultValue(""),
        NotifyParentProperty(true)
        ]
        public string CheckBoxID
        {
            get { return _checkBoxID; }
            set { _checkBoxID = value; }
        }

        private string _cssClassRowSelected;
        /**//// <summary>
        /// 选中行的样式的 CSS 类名
        /// </summary>
        [
        Description("选中行的样式的 CSS 类名"),
        Category("扩展"),
        DefaultValue(""),
        NotifyParentProperty(true)
        ]
        public string CssClassRowSelected
        {
            get { return _cssClassRowSelected; }
            set { _cssClassRowSelected = value; }
        }

        /**//// <summary>
        /// ToString()
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return "ChangeRowCSSByCheckBox";
        }
    }
}

3、在继承自GridView的类中加一个复杂对象属性，该复杂对象就是第2步创建的那个ChangeRowCSSByCheckBox

        private ChangeRowCSSByCheckBox _changeRowCSSByCheckBox;
        /**//// <summary>
        /// 通过行的CheckBox的选中与否来修改行的样式
        /// </summary>
        [
        Description("通过行的CheckBox的选中与否来修改行的样式"),
        Category("扩展"),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
        PersistenceMode(PersistenceMode.InnerProperty)
        ]
        public virtual ChangeRowCSSByCheckBox ChangeRowCSSByCheckBox
        {
            get
            {
                if (_changeRowCSSByCheckBox == null)
                {
                    _changeRowCSSByCheckBox = new ChangeRowCSSByCheckBox();
                }
                return _changeRowCSSByCheckBox;
            }
        }

4、新建一个JavaScriptConstant类，把我们要用到的javascript存在一个常量里

using System;
using System.Collections.Generic;
using System.Text;

namespace YYControls.SmartGridView
{
    /**//// <summary>
    /// javascript
    /// </summary>
    public class JavaScriptConstant
    {
        internal const string jsChangeRowClassName = @"<script type=""text/javascript"">
        //<![CDATA[
        function yy_ChangeRowClassName(id, cssClass, isForce)
        {
            objRow = document.getElementById(id);
            // 如果row的yy_selected属性是'false'或者没有yy_selected属性或者要求强制设置
            // 那么修改该行的className
            if (!objRow.attributes['yy_selected'] || objRow.attributes['yy_selected'].value == 'false' || isForce == true)
            {
                document.getElementById(id).className = cssClass;
            }
        }
        // 设置行的yy_selected属性
        function yy_SetRowSelectedAttribute(id, bln)
        {
            document.getElementById(id).attributes['yy_selected'].value = bln;
        }
        // 以id结尾的CheckBox执行两次click事件
        function yy_DoubleClickCheckBox(id)
        {
            var allInput = document.all.tags('INPUT');
  　　　　　for (var i=0; i < allInput.length; i++) 
  　　　　　{
  　　　　　    if (allInput[i].type == 'checkbox' && allInput[i].id.endWith('checkitem'))
   　　　　     {
                    // 触发click事件而不执行yy_ClickCheckItem()函数
                    isInvokeClickCheckItem = false;
    　　　　　　    allInput[i].click();
                    isInvokeClickCheckItem = false;
                    allInput[i].click();
   　　　　　　 }     
  　　　　　}

        }
        String.prototype.endWith = function(oString){   
            var reg = new RegExp(oString + ""$"");   
            return reg.test(this);
        }  
        //]]>
        </script>";
    }
}

5、重写OnPreRender方法，注册上面那段客户端脚本

        /**//// <summary>
        /// OnPreRender
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);

            if ((!String.IsNullOrEmpty(ChangeRowCSSByCheckBox.CheckBoxID) 
                && !String.IsNullOrEmpty(ChangeRowCSSByCheckBox.CssClassRowSelected))
                || !String.IsNullOrEmpty(CssClassMouseOver))
            {
                // 注册实现改变行样式的客户端脚本
                if (!Page.ClientScript.IsClientScriptBlockRegistered("jsChangeRowClassName"))
                {
                    Page.ClientScript.RegisterClientScriptBlock(
                        this.GetType(),
                        "jsChangeRowClassName", JavaScriptConstant.jsChangeRowClassName
                        );
                }
                // 注册调用双击CheckBox函数的客户端脚本
                if (!Page.ClientScript.IsStartupScriptRegistered("jsInvokeDoubleClickCheckBox"))
                {
                    Page.ClientScript.RegisterStartupScript(
                        this.GetType(),
                        "jsInvokeDoubleClickCheckBox", @"<script type=""text/javascript"">yy_DoubleClickCheckBox();</script>"
                        );
                }
            }
        }

6、重写OnRowDataBound以通过调用相关的javascript函数实现我们想要的功能。

        /**//// <summary>
        /// OnRowDataBound
        /// </summary>
        /// <param name="e"></param>
        protected override void OnRowDataBound(GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (!String.IsNullOrEmpty(ChangeRowCSSByCheckBox.CheckBoxID) && !String.IsNullOrEmpty(ChangeRowCSSByCheckBox.CssClassRowSelected))
                {
                    foreach (TableCell tc in e.Row.Cells)
                    {
                        // 如果发现了指定的CheckBox
                        if (tc.FindControl(ChangeRowCSSByCheckBox.CheckBoxID) != null)
                        {
                            CheckBox chk = tc.FindControl(ChangeRowCSSByCheckBox.CheckBoxID) as CheckBox;
                            string cssClassUnchecked = "";

                            // 根据RowState的不同，取消行的选中后<tr>的不同样式（css类名）
                            switch (e.Row.RowState)
                            {
                                case DataControlRowState.Alternate:
                                    cssClassUnchecked = base.AlternatingRowStyle.CssClass;
                                    break;
                                case DataControlRowState.Edit:
                                    cssClassUnchecked = base.EditRowStyle.CssClass;
                                    break;
                                case DataControlRowState.Normal:
                                    cssClassUnchecked = base.RowStyle.CssClass;
                                    break;
                                case DataControlRowState.Selected:
                                    cssClassUnchecked = base.SelectedRowStyle.CssClass;
                                    break;
                                default:
                                    cssClassUnchecked = "";
                                    break;
                            }

                            // 给行增加一个yy_selected属性，用于客户端判断行是否是选中状态
                            e.Row.Attributes.Add("yy_selected", "false");

                            // 添加CheckBox的click事件的客户端调用代码
                            string strOnclickScript = "";
                            if (!String.IsNullOrEmpty(chk.Attributes["onclick"]))
                            {
                                strOnclickScript += chk.Attributes["onclick"];
                            }
                            strOnclickScript += ";if (this.checked) "
                                + "{yy_ChangeRowClassName('" + e.Row.ClientID + "', '" + ChangeRowCSSByCheckBox.CssClassRowSelected + "', true);"
                                + "yy_SetRowSelectedAttribute('" + e.Row.ClientID + "', 'true')} "
                                + "else {yy_ChangeRowClassName('" + e.Row.ClientID + "', '" + cssClassUnchecked + "', true);"
                                + "yy_SetRowSelectedAttribute('" + e.Row.ClientID + "', 'false')}";
                            chk.Attributes.Add("onclick", strOnclickScript);

                            break;
                        }
                    }
                }
            }

            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，设置CheckBoxID属性为模板列的项复选框的ID，CssClassRowSelected属性设置为选中行的样式的CSS类名，则可以实现改变通过CheckBox选中的行的样式的功能。
ObjData.cs

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()
    {
        //
        // TODO: 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

<%@ 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</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <yyc:SmartGridView ID="SmartGridView1" runat="server" DataSourceID="ObjectDataSource1"
                AutoGenerateColumns="false">
                <Columns>
                    <asp:TemplateField>
                        <itemtemplate>
                            <%# Container.DataItemIndex + 1 %>
                         </itemtemplate>
                    </asp:TemplateField>
                    <asp:TemplateField ItemStyle-Width="100px">
                        <itemtemplate>
                            <asp:checkbox id="checkitem" runat="server" />
                        </itemtemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="no" HeaderText="序号" />
                    <asp:BoundField DataField="name" HeaderText="名称" />
                </Columns>
                <ChangeRowCSSByCheckBox CheckBoxID="checkitem" CssClassRowSelected="SelectedRow" />
            </yyc:SmartGridView>
            <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="Select"
                TypeName="OjbData"></asp:ObjectDataSource>
        </div>
    </form>
</body>
</html>

OK