帶圖片的，多列的DropDownList的實現

孟子E章發表於2004-07-29

下面是模仿的DropDownList的效果，支援圖片，多列，換行等。檢視例子

WebDropDownList.aspx

<%@ Page language="c#" Codebehind="WebDropDownList.aspx.cs"validateRequest="false"
 AutoEventWireup="false" Inherits="eMeng.WebDropDownList" %>
<HTML>
<HEAD>
<title>模擬下拉選單框</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style>BODY {
FONT: 12px 宋體
}
TD {
FONT: 12px 宋體
}
DIV {
FONT: 12px 宋體
}
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
}
</style>
<script>
var dropShow=false
var currentID
function dropdown(el){
if(dropShow){
dropFadeOut()
}else{
currentID=el
el.style.visibility="visible"
dropFadeIn()
}
}
function dropFadeIn(){//選單淡入的效果
if(currentID.filters.alpha.opacity<100){
currentID.filters.alpha.opacity+=20
fadeTimer=setTimeout("dropFadeIn()",50)
}else{
dropShow=true
clearTimeout(fadeTimer)
}
}
function dropFadeOut(){//選單淡出的效果
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){//高亮度顯示指標位置
if(dropShow){
for(i=0;i<el.parentElement.childNodes.length;i++){
el.parentElement.childNodes(i).className="link_record0"
}
el.className="link_record1"
}
}
function CheckMe(el){//替換顯示內容
document.all.text1.innerText=el.innerText
}
document.onclick=dropdownHide
</script>
</HEAD>
<body text="#000000" onload="document.all.form1.reset()">
<div style="padding:10px;border-bottom:2px solid red">模擬下拉框</div>
<form id="form1" onsubmit="alert(city.value)" runat="server">
<table>
<tr>
<td>
<div class="link_box" onselectstart="return false" style="WIDTH: 100px">
<div class="link_head" onclick="dropdown(value1)">
<table height="100%" cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
 <td>
  <div class="link_text"><nobr><label id="text1">請選擇？</label></nobr></div>
 </td>
 <td align="right" width="22">
  <div onmouseup="this.className='link_arrow0'" class="link_arrow0"
  onmousedown="this.className='link_arrow1'" onmouseout="this.className='link_arrow0'">6</div>
 </td>
</tr>
</table>
</div>
<div class="link_value" id="value1" style="WIDTH: 500px; HEIGHT: 300px">
<asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False" Font-Size="12px" Width="100%"
ShowHeader="False">
<Columns>
<asp:BoundColumn DataField="Title" SortExpression="Title"
 DataFormatString="<img src='http://dotnet.aspx.cc/Images/meng.gif' align='absmiddle'> {0}">
 </asp:BoundColumn>
<asp:BoundColumn DataField="CreateDate" SortExpression="CreateDate"
 HeaderText="" DataFormatString="{0:yyyy年MM月dd日}"></asp:BoundColumn>
</Columns>
</asp:datagrid>
<div id="mx">
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>北京市</label></div>
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>上海市</label></div>
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>河南省</label></div>
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>深圳市</label></div>
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>大連市</label></div>
<div class="link_record0" onmouseover="hiLight(this)"
 onclick="CheckMe(this);document.all.form1.city.value=this.innerText"><label>雲南省</label></div>
</div>
</div>
</div>
</td>
<td><input type="hidden" value="您尚未選擇" name="city"> <input type="submit" value="確定">
</td>
</tr>
</table>
</form>
</body>
</HTML>

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
{
/// <summary>
/// ShowList 的摘要說明。
/// </summary>
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("錯誤：" + 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：該呼叫是 ASP.NET Web 窗體設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 設計器支援所需的方法 - 不要使用程式碼編輯器修改
/// 此方法的內容。
/// </summary>
private void InitializeComponent()
{   
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}

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