Html 如何使用asp.net获取html选择的选定值
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How to get selected value of a html select with asp.net
提问by HasanG
I have code below:
我有以下代码：
<select id="testSelect">
<option value="1">One</option>
<option value="2">Two</option>
</select>
<asp:Button ID="btnTest" runat="server" Text="Test it!" onclick="btnTest_Click" />
I need to get selected options' value on postback. How can I do this with asp.net?
我需要在回发时获取所选选项的值。我怎样才能用 asp.net 做到这一点？
回答by Kobi
You need to add a name to your <select>element:
您需要为<select>元素添加一个名称：
<select id="testSelect" name="testSelect">
It will be posted to the server, and you can see it using:
它将被发布到服务器，您可以使用以下命令查看它：
Request.Form["testSelect"]
回答by Paulo Henrique Queiroz
I've used this solution to get what you need.
我已经使用这个解决方案来获得你需要的东西。
Let'say that in my .aspx code there's a select list runat="server":
假设在我的 .aspx 代码中有一个选择列表 runat="server"：
<select id="testSelect" runat="server" ClientIDMode="Static" required>
<option value="1">One</option>
<option value="2">Two</option>
</select>
In my C# code I used the code below to retrieve the text and also value of the options:
在我的 C# 代码中，我使用下面的代码来检索文本和选项的值：
testSelect.SelectedIndex == 0 ? "uninformed" :
testSelect.Items[testSelect.SelectedIndex].Text);
In this case I check if the user selected any of the options. If there's nothing selected I show the text as "uninformed".
在这种情况下，我检查用户是否选择了任何选项。如果没有选择任何内容，我会将文本显示为“不知情”。
回答by Pontus Bremdahl
If you would use asp:dropdownlistyou could select it easier by testSelect.Text.
如果您要使用，asp:dropdownlist您可以通过 更轻松地选择它testSelect.Text。
Now you'd have to do a Request.Form["testSelect"]to get the value after pressed btnTes.
现在，您必须执行 aRequest.Form["testSelect"]才能在按下后获取值btnTes。
Hope it helps.
希望能帮助到你。
EDIT: You need to specify a nameof the select (not only ID) to be able to Request.Form["testSelect"]
编辑：您需要指定一个name选择（不仅是 ID）才能Request.Form["testSelect"]
回答by QuanCSE
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> HtmlSelect Example </title>
<script runat="server">
void Button_Click (Object sender, EventArgs e)
{
Label1.Text = "Selected index: " + Select1.SelectedIndex.ToString()
+ ", value: " + Select1.Value;
}
</script>
</head>
<body>
<form id="form1" runat="server">
Select an item:
<select id="Select1" runat="server">
<option value="Text for Item 1" selected="selected"> Item 1 </option>
<option value="Text for Item 2"> Item 2 </option>
<option value="Text for Item 3"> Item 3 </option>
<option value="Text for Item 4"> Item 4 </option>
</select>
<button onserverclick="Button_Click" runat="server" Text="Submit"/>
<asp:Label id="Label1" runat="server"/>
</form>
</body>
</html>
Source from Microsoft. Hope this is helpful!
来源来自微软。希望这是有帮助的！
回答by Pavunkumar
Java script:
Java脚本：
use elementid. selectedIndex()function to get the selected index
使用 elementid. selectedIndex()函数获取所选索引
