DropDownList赋值，绑定，传值

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DropDownList赋值，绑定，传值

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

<!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>无标题页</title>

</head>

<body>

<table border=0 cellpadding=0 cellspacing=0><form name=meizz>

<tr><td>

<select id=list1 size=8 οndblclick="moveOption(this, this.form.list2)">

<option value=A>aaaaaaaaaa

<option value=B>bbbbbbbbbb

<option value=C>cccccccccc

<option value=D>dddddddddd

<option value=E>eeeeeeeeee

<option value=F>ffffffffff

<option value=G>gggggggggg

<option value=H>hhhhhhhhhh

</select></td>

<td width=40 align=center>

<input name=add type=button value=">>>" οnclick="moveOption(this.form.list1, this.form.list2)"><br><br>

<input name=sub type=button value="<<<" οnclick="moveOption(this.form.list2, this.form.list1)">

</td><td>

<select id=list2 size=8 οndblclick="moveOption(this, this.form.list1)">

</select>

</td></tr></form>

</table>

<script language="JavaScript"></script>

</BODY>

</HTML>

<div style="position: absolute; top: 10; right: 10; 148; height: 18;cursor:hand">

<input type="button" name="Button" value="查看源代码" onClick= 'window.location = "view-source:" + window.location.href'></div>

-------------------------------------------------------------------

-----------------------------绑定好的下拉框，再加一行“--请选择--” 开始

string sqlseng1 = "select * from Bumen";

SqlDataReader dr = DBHelper.GetReader(sqlseng1);

ddlbumen.DataSource = dr;

ddlbumen.DataValueField = "bumenname";

ddlbumen.DataTextField = "bumenname";

ddlbumen.DataBind();

dr.Close();

ListItem lit = new ListItem();

lit.Text = "—请选择—";

lit.Value = "—请选择—";

ddlbumen.Items.Add(lit);

ddlbumen.SelectedValue = "—请选择—";

-----------------------------绑定好的下拉框，再加一行“--请选择--” 结束

-----------------------------------------------------------------------------------------------------------------------

this.DropDownList3.Items.Insert(0, new ListItem("请选择"));

--

DropDownList1.SelectedValue = trade.Tradesort.Id.ToString(); //默认选中值.传来的值。有时不可用，下面有可用的

--

------------

ListItem lit = new ListItem();

lit.Text = "—请选择—";

lit.Value = "—请选择—";

ddlbumen.Items.Add(lit);

ddlbumen.SelectedValue = "—请选择—";

----------------

for (int i = 0; i < list.Count; i++)

{

pm = list[i];

//pm.Pro_id

propm = new product();

probll = new productbll();

prolist = new List<product>();

prolist = probll.get_productby_id(Convert.ToInt32(pm.Pro_id));

for (int j = 0; j < prolist.Count; j++)

{

ListItem lit = new ListItem();

lit.Text = prolist[i].Name.ToString();

lit.Value = prolist[i].Id.ToString();

this.drp_product.Items.Insert(0, lit);

}

}

-------------------------------------------------------------------------------------------------

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

<!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>无标题页</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<script>

function showHide(obj){ //隐现层的函数

sh={block:"none",none:"block"}

//层的display属性值在"block"和"none"间不断轮换，

//达到轮换隐藏和显示的效果

oOption.runtimeStyle.display=sh[oOption.currentStyle.display] }

</script>



<script event="onmouseover" for="oOption">

obj=event.srcElement

if(obj.tagName=="TD"){//判断onmouseover事件是否发生在单元格上

//设置事件发生所在的单元格的背景颜色

obj.style.backgroundColor="#dedede"

//设置事件发生所在的单元格的字体颜色

obj.style.color="#FFFFFF"

}

</script>



<script event="onmouseout" for="oOption">

obj=event.srcElement

if(obj.tagName=="TD"){ //判断onmouseout事件是否发生在单元格上

//设置事件发生所在的单元格的背景颜色

obj.style.backgroundColor="#FFFFFF"

obj.style.color="#000000"//设置事件发生所在的单元格的字体颜色

}

</script>



<script event="onclick" for="oOption">

obj=event.srcElement

if(obj.tagName=="TD"){ //判断onmouseover事件是否发生在单元格上

showHide() //隐藏层

//设置id为oSelect的对象内的文本为被点击的单元格内的文本

oSelect.innerText=obj.innerText

//设置id为C_Select的对象内的值为被点击的

//单元格的自定义属性value的值

C_Select.value=obj.value

//window.open(obj.value) //测试跳转菜单功能

}

</script>

<style>

body,td{font-size:12px}

.over{color:#dedede}

.out{color:#333333}

#oOption{

scrollbar-face-color:#FFFFFF;

scrollbar-shadow-color:#C1C1BB;

scrollbar-highlight-color:#C1C1BB;

scrollbar-3dlight-color:#EBEBE4;

scrollbar-darkshadow-color:#EBEBE4;

scrollbar-track-color:#F4F4F0;

scrollbar-arrow-color:#CACAB7;

position:absolute;display:none;75px;height:80px;

overflow:scroll;overflow-x:hidden;

border:#333333 1px solid;border-top:none;cursor:default

}

</style>

<table width="75" border="0" cellspacing="0" cellpadding="0">

<tr><td>

<table width="100%" bordercolor="#666666" border=1 style="border-collapse:collapse;cursor:default" οnclick="showHide()">

<tr>

<td align="center">

<input type="hidden" name="C_Select" id="C_Select">

<span id="oSelect">下拉选项</span></td><td align="center" width="14"><span style="font-family: Webdings;colro:#CACAB7" οnmοuseοver="this.className=’over’" οnmοuseοut="this.className=’out’">6</span></td>

</tr>

</table>

</td>

</tr>

<tr>

<td><div id="oOption" onselectstart="return false">

<table cellsapcing="0" cellspadding="3" border="0" width="100%">

<tr><td value="http://www.flash8.net">闪吧</td></tr>

<tr><td value="http://www.blueidea.com">经典</td></tr>

<tr><td value="http://www.5d.cn">5D</td></tr>

<tr><td value="http://www.sina.com">新浪</td></tr>

<tr><td value="http://www.sohu.cn">搜狐</td></tr>

<tr><td value="http://www.163.com">网易</td></tr>

<tr><td value="http://www.etang.com">亿唐</td></tr>

</table>

</div></td>

</tr>

</table>

</div>

</form>

</body>

</html>

----------------------------------------------------------------------------------------------------------protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

int year = DateTime.Now.Year;

for (int beginYear = year; beginYear > 2000; beginYear--)

{

DropDownList1.Items.Add(beginYear.ToString());

}

}

}-

---------------------------------------------------------------------------------------------------------------------

传值

if (!string.IsNullOrEmpty(proid))

{

productinfo = productinfoibll.GetEntity(proid);

ddlProduct.DataSource = lprotduct;

ddlProduct.DataTextField = "productName";

ddlProduct.DataValueField = "productId";

ddlProduct.DataBind();

//ddlProduct.SelectedValue = proid;

ListItem lit = new ListItem();

lit.Text = productinfo.productName;

lit.Value = productinfo.productId;

ddlProduct.Items.Insert(0, lit);

}

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原文地址：https://www.cnblogs.com/wybshyy/p/13783872.html