C# html 选择（下拉）控件在asp.net中选择索引更改事件
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html select (dropdown) control selected index changed event in asp.net
提问by Laziale
I am trying to put backend code to my html select control (dropdown) when the value is changed a backend method to be triggered, but I Can't find the event. I tried this way:
当值更改为要触发的后端方法时，我试图将后端代码放入我的 html 选择控件（下拉列表），但我找不到该事件。我试过这种方式：
<select id="ddlCompany" name="select2" onchange="ddlCompany_SelectedIndexChanged" runat="server" class="dropdown nostyle sel1" style="width:100%;" placeholder="Select Company" />
nothing changes. Can anyone advice how I can fix this? Thx, Laziale
没有什么改变。谁能建议我如何解决这个问题？谢谢，拉齐亚莱
采纳答案by nikeaa
Try using the SelectedIndexChanged property instead of onchange, like this:
尝试使用 SelectedIndexChanged 属性而不是 onchange，如下所示：
<select id="ddlCompany" name="select2" OnSelectedIndexChanged="ddlCompany_SelectedIndexChanged" runat="server" class="dropdown nostyle sel1" style="width:100%;" placeholder="Select Company" />
回答by The Vanilla Thrilla
Add this to your code behind:
将此添加到您的代码后面：
protected void ddlCompany_SelectedIndexChanged(object sender, EventArgs e)
{
//code here
}
And this to your markup:
这对您的标记：
OnSelectedIndexChanged="ddlCompany_SelectedIndexChanged" AutoPostBack="True"
回答by Shyju
If you are using the dropdownlist server control. Go to the designer view, Select the dropdownlist server control and right click and select Properties. Now in the properties window, click on the Eventsicon and then you can see the SelectedIndexChangedevent. Double click on the blank white space on the right side and Visual studio will generate the relevant code for you.
如果您使用下拉列表服务器控件。转到设计器视图，选择下拉列表服务器控件并右键单击并选择Properties。现在在属性窗口中，单击“事件”图标，然后您就可以看到该SelectedIndexChanged事件。双击右侧空白处，Visual Studio 将为您生成相关代码。
