如何在动态添加的DropDownList's ListItem上添加OnClick事件

本文关键字：添加 ListItem 事件 OnClick 动态 DropDownList | 更新日期: 2023-09-27 18:09:37

假设我有以下代码:

        DropDownList changesList = new DropDownList();
        ListItem item;
        item = new ListItem();
        item.Text = "go to google.com";
        changesList.Items.Add(item);

如何动态添加OnClick事件到item，以便点击item后google.com将被访问

如何在动态添加的DropDownList's ListItem上添加OnClick事件

将此添加到您的代码中:

DropDownList changesList = new DropDownList();
ListItem item;
item = new ListItem();
item.Text = "go to google.com";
item.Value = "http://www.google.com";
changesList.Items.Add(item);
changesList.Attributes.Add("onChange", "location.href = this.options[this.selectedIndex].value;");

首先声明下拉列表

 <asp:DropDownList ID="ddlDestination" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddl_SelectedIndexChanged">
    <asp:ListItem Text="Select Destination" Selected="True" />
    <asp:ListItem Text="Go To Google.com" Value="http://www.google.com" />
    <asp:ListItem Text="Go To Yahoo.com" Value="http://www.yahoo.com" />
    <asp:ListItem Text="Go To stackoverflow.com" Value="http://www.stackoverflow.com" />
</asp:DropDownList>
第二，在后面的代码中放入这段代码 
protected void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
    if (ddlDestination.SelectedIndex > 0)
    {
        string goToWebsite = ddlDestination.SelectedValue;
        Response.Redirect(goToWebsite);
    }
}

希望能有所帮助

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