[jQuery] RadioButtonList 取值

2014-02-26

18193
0
2014-03-06

摘要:[jQuery] RadioButtonList 取值

情境:

透過jQuery取出頁面上RadioButtonList的值步驟如下:

透過選擇器把RadioButtomList的元素找出來
利用.val()的方法取值

aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="jQueryDemo_RadioButtonList.aspx.cs" Inherits="jQueryDemo_RadioButtonList" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:RadioButtonList ID="RadioButtonList_City" runat="server" RepeatDirection="Horizontal">
            <asp:ListItem Value="0">台北市</asp:ListItem>
            <asp:ListItem Value="1">台中市</asp:ListItem>
            <asp:ListItem Value="2">高雄市</asp:ListItem>
        </asp:RadioButtonList>
        <input id="Button_Confirm" type="button" value="確認" />
        <asp:TextBox ID="TextBox_City" runat="server"></asp:TextBox>
    </form>
</body>
</html>

aspx render出來的html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
      <title>
      </title>
   </head>
   <body>
      <form name="form1" method="post" action="jQueryDemo_RadioButtonList.aspx" id="form1">
         <div>
            <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTI5MTA2MTU4MmRkczu7b8cD9jBr+Uw1Mx2WzCiWsFY=" />
         </div>
         <div>
            <input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="AF8A930C" />
            <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWBgKjkd/fDQK58ObPCwKm8ObPCwKn8ObPCwKpn8yhBwKmrvLeAcz2Gn8XY8ZAF4tPdYgAU6gbqVCR" />
         </div>
         <table id="RadioButtonList_City" border="0">
            <tr>
               <td><input id="RadioButtonList_City_0" type="radio" name="RadioButtonList_City" value="0" checked="checked" /><label for="RadioButtonList_City_0">台北市</label></td>
               <td><input id="RadioButtonList_City_1" type="radio" name="RadioButtonList_City" value="1" /><label for="RadioButtonList_City_1">台中市</label></td>
               <td><input id="RadioButtonList_City_2" type="radio" name="RadioButtonList_City" value="2" /><label for="RadioButtonList_City_2">高雄市</label></td>
            </tr>
         </table>
         <input id="Button_Confirm" type="button" value="確認" />
         <input name="TextBox_City" type="text" id="TextBox_City" />
      </form>
   </body>
</html>

分析:

其實ASP.NET的RadioButtonList控制項

render過後會變成

我們會看到html的input元素有幾個重要的屬性:

type => 都是『radio』的類別
name => 都是『RadioButtonList_City』的名稱
value => 每個選項對應的值
label => 每個選項對應的文字

查了jQuery的API後可得知選取RadioButtonList的元素可透過:

完整的aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="jQueryDemo_RadioButtonList.aspx.cs" Inherits="jQueryDemo_RadioButtonList" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#Button_Confirm").on("click", function () {
                var value = $("input:radio[name='RadioButtonList_City']:checked").val();
                var text = $("input:radio[name='RadioButtonList_City']:checked + label").text();

                $("#TextBox_City").val(text);
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:RadioButtonList ID="RadioButtonList_City" runat="server" RepeatDirection="Horizontal">
            <asp:ListItem Value="0">台北市</asp:ListItem>
            <asp:ListItem Value="1">台中市</asp:ListItem>
            <asp:ListItem Value="2">高雄市</asp:ListItem>
        </asp:RadioButtonList>
        <input id="Button_Confirm" type="button" value="確認" />
        <asp:TextBox ID="TextBox_City" runat="server"></asp:TextBox>
    </form>
</body>
</html>

範例:

參考:

input取值 http://devdocs.io/jquery/val
其他非input元素取文字 http://devdocs.io/jquery/text

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