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分享dropdownlist控件
下面程序哪有问题，不出效果？！（可直接vc下列代码）
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}
</script>
<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>
<asp:XmlDataSource ID="Colors" runat="server">
<Data>
<Colors>
<Color ColorId="White" ColorName="White" />
<Color ColorId="Silver" ColorName="Silver" />
<Color ColorId="DarkGray" ColorName="Dark Gray" />
<Color ColorId="Khaki" ColorName="Khaki" />
<Color ColorId="DarkKhaki" ColorName="Dark Khaki" />
</Colors>
</Data>
</asp:XmlDataSource>
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="Colors" DataTextField="ColorName"
DataValueField="ColorId" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList><br />
<br />
<asp:Label ID="Label1" runat="server" Text="label背景色变化"></asp:Label></div>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}
</script>
<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>
<asp:XmlDataSource ID="Colors" runat="server">
<Data>
<Colors>
<Color ColorId="White" ColorName="White" />
<Color ColorId="Silver" ColorName="Silver" />
<Color ColorId="DarkGray" ColorName="Dark Gray" />
<Color ColorId="Khaki" ColorName="Khaki" />
<Color ColorId="DarkKhaki" ColorName="Dark Khaki" />
</Colors>
</Data>
</asp:XmlDataSource>
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="Colors" DataTextField="ColorName"
DataValueField="ColorId" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList><br />
<br />
<asp:Label ID="Label1" runat="server" Text="label背景色变化"></asp:Label></div>
</form>
</body>
</html>
...全文
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hyuanyuan 2009-08-05
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没有将代码放在单独的页中，有什么区别吗
Lakers_24号程序员 2009-08-05
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为什么要用<script runat="server">
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}
</script>
这种方式呢？
你直接把DropDownList1_SelectedIndexChanged事件在cs文件里写来行吗
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}
</script>
这种方式呢？
你直接把DropDownList1_SelectedIndexChanged事件在cs文件里写来行吗
jwdream2008 2009-08-05
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!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>
<asp:XmlDataSource ID="Colors" runat="server">
<Data>
<Colors>
<Color ColorId="White" ColorName="White" />
<Color ColorId="Silver" ColorName="Silver" />
<Color ColorId="DarkGray" ColorName="Dark Gray" />
<Color ColorId="Khaki" ColorName="Khaki" />
<Color ColorId="DarkKhaki" ColorName="Dark Khaki" />
</Colors>
</Data>
</asp:XmlDataSource>
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="Colors" DataTextField="ColorName"
DataValueField="ColorId" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList> <br />
<br />
<asp:Label ID="Label1" runat="server" Text="label背景色变化"> </asp:Label>
</div>
</form>
</body>
</html>
后台代码：
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Label1.BackColor = System.Drawing.Color.FromName(DropDownList1.SelectedItem.Value);
}jwdream2008 2009-08-05
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没问题啊，可以显示效果啊！
zhulong1111 2009-08-05
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在事件那设断点调试下，
Lovely_baby 2009-08-05
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是不是 要在Page_load中加上 if (!IsPostBack){}添些东西
