今天開發碰見一個問題,就是當GridView中加入一個包含RadioButton的模板列,結果一運行。。。。。天啊,單選按鈕可以多選了! 囧啊!爲了演示一下我今天的錯誤我還是模擬一個功能場景吧,我要實現的功能是顯示一個包含單選按鈕的學生信息列表,選擇一行後將詳細信息顯示出來~!
1.問題展現
①首先準備一個GridView用來展示學生的基本信息與最重要的單選按鈕,代碼如下:
- <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
- <Columns>
- <asp:TemplateField>
- <ItemTemplate>
- <asp:RadioButton ID="rbStudent" runat="server" />
- </ItemTemplate>
- </asp:TemplateField>
- <asp:BoundField DataField="SName" HeaderText="用戶名" />
- <asp:BoundField DataField="SSex" HeaderText="性別" />
- </Columns>
- </asp:GridView>
②接下來準備需要綁定數據的實體,代碼如下:
- public class Student
- {
- public string SID { get; set; }
- public string SName { get; set; }
- public string SSex { get; set; }
- }
③初始化數據,綁定GridView列表,代碼如下:
- protected void Page_Load(object sender, EventArgs e)
- {
- if (!IsPostBack)
- {
- this.BindGridView();
- }
- }
- public void BindGridView()
- {
- List<Student> sList = new List<Student>()
- {
- new Student(){ SID = "s001", SName="張三", SSex="男"},
- new Student(){ SID = "s002", SName="李四", SSex="女"},
- new Student(){ SID = "s003", SName="王五", SSex="男"}
- };
- GridView1.DataSource = sList;
- GridView1.DataBind();
- }
什麼原因呢?細心的人可能會說RadioButton你沒有設置GroupName屬性所以不屬於一組,但事實我設置了該屬性後還是無效!
2.解決思路
① 問題分析
在運行後,我右鍵查看源代碼後發現了這個詭異的問題,原來是GridView會自動給input 的name屬性賦值,導致了每一行的name屬性都不一樣,造成了不能單選的問題,GridView生成代碼如下:
- <table cellspacing="0" rules="all" border="1" id="GridView1" style="border-collapse:collapse;">
- <tr>
- <th scope="col"> </th><th scope="col">用戶名</th><th scope="col">性別</th>
- </tr><tr>
- <td>
- <input id="GridView1_rbStudent_0" type="radio" name="GridView1$ctl02$rbStudent" value="rbStudent" />
- </td><td>張三</td><td>男</td>
- </tr><tr>
- <td>
- <input id="GridView1_rbStudent_1" type="radio" name="GridView1$ctl03$rbStudent" value="rbStudent" />
- </td><td>李四</td><td>女</td>
- </tr><tr>
- <td>
- <input id="GridView1_rbStudent_2" type="radio" name="GridView1$ctl04$rbStudent" value="rbStudent" />
- </td><td>王五</td><td>男</td>
- </tr>
- </table>
我第一個想到的辦法就是人工將name屬性改爲統一的,那麼如何改呢?有的人可能會說那很簡單啊,使用GridView的OnRowDataBound事件在行綁定的時候講RadioButton的name屬性改一下就好拉!代碼如下:
- protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
- {
- if (e.Row.RowType == DataControlRowType.DataRow)
- {
- RadioButton RadioButtionRB = (RadioButton)e.Row.FindControl("rbStudent");
- RadioButtionRB.Attributes["name"] = "student";
- }
- }
- <span name="student"><input id="GridView1_rbStudent_0" type="radio" name="GridView1$ctl02$rbStudent" value="rbStudent" /></span>
- </td><td>張三</td><td>男</td>
- </tr><tr>
- <td>
- <span name="student"><input id="GridView1_rbStudent_1" type="radio" name="GridView1$ctl03$rbStudent" value="rbStudent" /></span>
- </td><td>李四</td><td>女</td>
- </tr><tr>
- <td>
- <span name="student"><input id="GridView1_rbStudent_2" type="radio" name="GridView1$ctl04$rbStudent" value="rbStudent" /></span>
- </td><td>王五</td><td>男</td>
② 問題解決
首先先來實現一個JS函數,用來獲取遍歷GridView中的RadioButton並將其name屬性設置爲一個統一的值,例如“myradio”,代碼如下:
- <script type="text/javascript">
- function SetRadioName() {
- var gv = document.getElementById("GridView1"); //獲取GridView的客戶端ID
- var myradio = gv.getElementsByTagName("input"); //獲取GridView的Inputhtml
- for (var i = 0; i < myradio.length; i++) {
- if (myradio[i].type == 'radio')//hidden
- {
- myradio[i].setAttribute("name", "myradio");
- }
- }
- }
- </script>
- protected void Page_Load(object sender, EventArgs e)
- {
- if (!IsPostBack)
- {
- this.BindGridView();
- ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(),
- "SetRadioName()", true);
- }
- }