ASP.NET 下拉菜单项颜色
我在 ASP.NET 页面上有一个由 SQL 数据库填充的 DropDownList。
<asp:DropDownList ID="ddlName" runat="server"></asp:DropDownList>
代码隐藏文件中的人口数量下降:
ddlName.DataSource = SqlDataSource1;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
我想知道是否可以根据列表中项目的值更改其背景或文本颜色?
我刚刚注意到,下面的示例在页面首次加载时有效,但在回发时文本颜色消失,即使那是代码所在的位置。我有什么遗漏的吗?
protected override void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlName.DataSource = SqlDataSource5;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
foreach (ListItem item in ddlName.Items)
{
if (item.Value == "Item 1")
{
item.Attributes.Add("style", "color:red");
}
if (item.Value == "Item 2")
{
item.Attributes.Add("style", "color:red");
}
}
}
}
I have a DropDownList on an ASP.NET page that gets populated by a SQL database.
<asp:DropDownList ID="ddlName" runat="server"></asp:DropDownList>
The population is down in the code behind file:
ddlName.DataSource = SqlDataSource1;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
I was wondering if it was possible to change the background or text color of an item in the list based on it's value?
I just noticed that the example below works when the page first loads but on postback the text color disappears even though that is where the code is. Is there something I am missing?
protected override void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlName.DataSource = SqlDataSource5;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
foreach (ListItem item in ddlName.Items)
{
if (item.Value == "Item 1")
{
item.Attributes.Add("style", "color:red");
}
if (item.Value == "Item 2")
{
item.Attributes.Add("style", "color:red");
}
}
}
}
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论
评论(1)
是的,您当然可以,将其添加到您的页面加载事件中。
如果这不起作用,您可以将此代码移至下拉列表的 DataBound 事件。
Yup you sure can, add this to your page load event.
If that doesn't work, you can move this code to the DataBound event of the Drop Down List.