[转贴]带图片的，多列的DropDownList的实现

下面是模仿的DropDownList的效果，支持图片，多列，换行等。

WebDropDownList.aspx
<%@ Page language="c#" Codebehind="WebDropDownList.aspx.cs"validateRequest="false"
AutoEventWireup="false" Inherits="eMeng.WebDropDownList" %>

模拟下拉列表框

BODY {
FONT: 12px 宋体
}
TD {
FONT: 12px 宋体
}
DIV {
FONT: 12px 宋体
}
LABEL {
PADDING-RIGHT: 0px; PADDING-LEFT: 4px; PADDING-BOTTOM: 0px; PADDING-TOP: 3px; HEIGHT: 19px
}
.link_box {
CURSOR: default; TEXT-ALIGN: left
}
.link_head {
BORDER-RIGHT: 2px inset; BORDER-TOP: 2px inset; BORDER-LEFT: 2px inset; WIDTH: 100%;
BORDER-BOTTOM: 2px inset; HEIGHT: 23px
}
.link_text {
PADDING-LEFT: 2px; BACKGROUND: #fff
}
.link_arrow0 {
BORDER-RIGHT: 2px outset; BORDER-TOP: 2px outset; BACKGROUND: buttonface;
FONT: 14px marlett; BORDER-LEFT: 2px outset; WIDTH: 22px;
BORDER-BOTTOM: 2px outset; HEIGHT: 100%; TEXT-ALIGN: center
}
.link_arrow1 {
BORDER-RIGHT: buttonshadow 1px solid; PADDING-RIGHT: 0px;
BORDER-TOP: buttonshadow 1px solid; PADDING-LEFT: 2px;
BACKGROUND: buttonface; PADDING-BOTTOM: 0px; FONT: 14px marlett;
BORDER-LEFT: buttonshadow 1px solid; WIDTH: 22px; PADDING-TOP: 2px;
BORDER-BOTTOM: buttonshadow 1px solid; HEIGHT: 100%; TEXT-ALIGN: center
}
.link_value {
BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; FILTER: alpha(opacity:0);
VISIBILITY: hidden; OVERFLOW-X: hidden; OVERFLOW: auto; BORDER-LEFT: 1px solid;
BORDER-BOTTOM: 1px solid; POSITION: absolute
}
.link_record0 {
BORDER-TOP: #eee 1px solid; PADDING-LEFT: 2px; BACKGROUND: #fff;
WIDTH: 100%; COLOR: #000; HEIGHT: 20px
}
.link_record1 {
BORDER-TOP: #047 1px solid; PADDING-LEFT: 2px; BACKGROUND: #058;
WIDTH: 100%; COLOR: #fe0; HEIGHT: 20px
}

var dropShow=false
var currentID
function dropdown(el){
if(dropShow){
dropFadeOut()
}else{
currentID=el
el.style.visibility="visible"
dropFadeIn()
}
}
function dropFadeIn(){//选单淡入的效果
if(currentID.filters.alpha.opacity<100){
currentID.filters.alpha.opacity+=20
fadeTimer=setTimeout("dropFadeIn()",50)
}else{
dropShow=true
clearTimeout(fadeTimer)
}
}
function dropFadeOut(){//选单淡出的效果
if(currentID.filters.alpha.opacity>0){
clearTimeout(fadeTimer)
currentID.filters.alpha.opacity-=20
fadeTimer=setTimeout("dropFadeOut()",50)
}else{
dropShow=false
currentID.style.visibility="hidden"
}
}
function dropdownHide(){
if(dropShow){
dropFadeOut()
dropShow=false
}
}
function hiLight(el){//高亮度显示指标位置
if(dropShow){
for(i=0;i

模拟下拉框

请选择？ 6 {0}"> 北京市 上海市 河南省 深圳市 大连市 云南省

WebDropDownList.aspx.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

namespace eMeng
{
///
/// ShowList 的摘要说明。
///
public class WebDropDownList : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
{
DataGrid1.Columns[0].ItemStyle.Width = Unit.Pixel(400);
DataGrid1.Columns[1].ItemStyle.Width = Unit.Pixel(100);
Data_Bind();
}

public void Data_Bind()
{
Response.CacheControl = "no-cache";
Response.Expires = -1;
try
{
string strSQL = "SELECT id,objectGuid,Title,CreateDate,HitCount FROM Document ORDER BY id DESC";
string cnString = (new Connection()).ConnectionString;
OleDbConnection cn = new OleDbConnection(cnString);
cn.Open();
OleDbCommand cmd = new OleDbCommand(strSQL, cn);
DataGrid1.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataGrid1.DataBind();
cn.Close();
cn.Dispose();
cn = null;
cmd.Dispose();
cmd = null;
}
catch(OleDbException myOleDbException)
{
Response.Write("错误：" + myOleDbException.Message + ":" + myOleDbException.HelpLink);
Response.End();
}
}
private void DataGrid1_ItemDataBound(object sender,System.Web.UI.WebControls.DataGridItemEventArgs e)
{

if( e.Item.ItemIndex != -1 )
{
e.Item.Attributes.Add("onmouseover", "this.bgColor='#C1D2EE'");
e.Item.Attributes.Add("onclick",
"document.all.text1.innerText=this.cells[0].innerText;document.all.form1.city.value=this.cells[0].innerText;");
if (e.Item.ItemIndex % 2 == 0 )
{
e.Item.Attributes.Add("bgcolor", "#FFFFFF");
e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('singleValue')");
}
else
{
e.Item.Attributes.Add("bgcolor", "oldlace");
e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('oldValue')");
}
}
else
{
DataGrid1.Attributes.Add("oldValue", "oldlace");
DataGrid1.Attributes.Add("singleValue", "#FFFFFF");
}
}
#region Web Form Designer generated code
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);
}

///
/// 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。
///
private void InitializeComponent()
{
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}