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How to get selected value of a html select with asp.net

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死守一世寂寞
死守一世寂寞 2020-12-16 09:36

I have code below:
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  • 粉色の甜心
    2020-12-16 10:06 
    <%@ 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!

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  • 你的背包
    2020-12-16 10:11

    You need to add a name to your <select> element:

    <select id="testSelect" name="testSelect">

    It will be posted to the server, and you can see it using:

    Request.Form["testSelect"]
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  • 粉色の甜心
    2020-12-16 10:15

    Java script:

    use elementid. selectedIndex() function to get the selected index

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  • 难免孤独
    2020-12-16 10:19

    If you would use asp:dropdownlist you could select it easier by testSelect.Text.

    Now you'd have to do a Request.Form["testSelect"] to get the value after pressed btnTes.

    Hope it helps.

    EDIT: You need to specify a name of the select (not only ID) to be able to Request.Form["testSelect"]

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