ASP.NET控件之RadioButtonList


RadioButtonList”控件表示一個封裝了一組單選按鈕控件的列表控件。

可以使用兩種類型的 ASP.NET 控件將單選按鈕添加到網頁上:各個“RadioButton”控件或一個“RadioButtonList”控件。這兩類控件都允許用戶從一小組互相排斥的預定義選項中進行選擇。使用這些控件,可定義任意數目的帶標簽的單選按鈕,並將它們水平或垂直排列。

命名空間:System.Web.UI.WebControls
程序集:System.Web(在 system.web.dll 中)

[ValidationPropertyAttribute("SelectedItem")]
public class RadioButtonList : ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler

RadioButtonList 控件為網頁開發人員提供了一組單選按鈕,這些按鈕可以通過數據綁定動態生成。該控件包含一個 Items 集合,集合中的成員與列表中的各項相對應。若要確定選擇了哪一項,請測試列表的 SelectedItem 屬性。

可以用 RepeatLayout 和 RepeatDirection 屬性指定如何呈現列表。如果將 RepeatLayout 設置為 RepeatLayout.Table(默認設置),列表將呈現在表中。如果設置為 RepeatLayout.Flow,列表將不以表格形式呈現。默認情況下,RepeatDirection 設置為 RepeatDirection.Vertical。將該屬性設置為 RepeatDirection.Horizontal 時,列表將水平呈現。

RadioButtonList用法

                <div class="rblStyle">
                <asp:RadioButtonList ID="rblChangQHT" runat="server" RepeatDirection="Horizontal">
                <asp:ListItem Text="是" Value="1"></asp:ListItem>
                <asp:ListItem Text="否" Value="0"></asp:ListItem>
                </asp:RadioButtonList></div>

1.RadioButtonList 校驗

            var rb_ChangQHT = document.getElementById("rblChangQHT");
            var ShiF = rb_ChangQHT.getElementsByTagName("INPUT");
            var result = false;
            for (var i = 0; i < ShiF.length; i++) {
                if (ShiF[i].checked) {
                    result = true;
                    break;
                }
            }
            if (!result) {
                alert("是否為中長期合同為必填項!");
                return false;
            }

2.RadioButtonList樣式調整

.rblStyle{width:100%;height:auto;}
.rblStyle input{border-style:none;}

3.onselectedindexchanged事件

像下拉控件dropdownlist控件一樣,它也有onselectedindexchanged事件,當選項改變后進行觸發

注意點是:控件中的AutoPostBack屬性一定設為"True",這樣服務器端才知道你的選項改變了,並觸發相應事件

4.為ListItem添加提示

            RadioButtonList1.Items[0].Attributes.Add("title", "提示內容");
5.綁定數據源

            string sql = "select * from province";
            DataTable dt = SQLHelper.ExecuteDataTable(sql);
            this.RadioButtonList1.DataSource = dt;
            this.RadioButtonList1.DataTextField = "Provinces";
            this.RadioButtonList1.DataValueField = "PId";
            this.RadioButtonList1.DataBind();
6.改變選中項的前景色

<asp:RadioButtonList ID="rblIsLock" runat="server" AutoPostBack="true" OnSelectedIndexChanged="rblIsLock_SelectedIndexChanged"  RepeatDirection="Horizontal" RepeatLayout="Flow">                        

<asp:ListItem Selected="True" Value="0">啟用 </asp:ListItem>                        

<asp:ListItem Value="1">禁用 </asp:ListItem>

</asp:RadioButtonList>

<label>*禁用的用戶將無法登錄</label>

后台:  

protected void rblIsLock_SelectedIndexChanged(object sender, EventArgs e)    

{        

    var rbl = sender as RadioButtonList;        

    HighliehgSelectedItem(rbl);    

}

private void HighliehgSelectedItem(RadioButtonList rbl)    

{        

    foreach (ListItem li in rbl.Items)        

   {            

     if (li.Selected)            

    {         

       li.Attributes.Add("style", "color: red;");            

     }        

   }    

}

7.后台動態增加RadioButtonList

                    RadioButtonList rbl = new RadioButtonList();
                    rbl.ID = "rbl" + (i + 1).ToString();
                    rbl.BorderStyle = BorderStyle.None;
                    rbl.RepeatLayout = RepeatLayout.Flow;
                    rbl.RepeatDirection = RepeatDirection.Horizontal;
                    rbl.TextAlign = TextAlign.Right;
                    rbl.CellSpacing = 6;
                    rbl.Attributes.Add("onclick", "CheckRbl('ctl00_ctl00_ctl00_ContentPlaceHolder1_cphBody_cphLower_" + rbl.ID + "')");
                    rbl.DataSource = dtRating.DefaultView;
                    rbl.DataTextField = "LevelID";
                    rbl.DataValueField = "LevelID";
                    rbl.DataBind();
                    tc.Controls.Add(rbl); //tc是TableRow的一個單元格TableCell

                    for (int k = 0; k < rbl.Items.Count; k++)
                    {
                        rbl.Items[k].Attributes.Add("title", dtRating.Rows[k][1].ToString());
                        rbl.Items[k].Attributes.Add("style", "margin-left:10px;");
                    }

8.前台改變選中項的背景色

            window.onload = function () {
            var arr = document.getElementsByTagName("INPUT");
            for (var i = 0; i < arr.length; i++) {
                if (arr[i].checked) {
                    if (arr[i].type == "radio") {
                        arr[i].style.backgroundColor = "red";
                    }
                    else {
                        arr[i].style.backgroundColor = "";
                    }
                }
                else {
                    arr[i].style.backgroundColor = "";
                }
            }
        }


免責聲明!

本站轉載的文章為個人學習借鑒使用,本站對版權不負任何法律責任。如果侵犯了您的隱私權益,請聯系本站郵箱yoyou2525@163.com刪除。



 
粵ICP備18138465號   © 2018-2025 CODEPRJ.COM