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2025-02-21 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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这篇文章主要介绍了ASP.NET控件中RadioButtonList的示例分析,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
"RadioButtonList"控件表示一个封装了一组单选按钮控件的列表控件。
可以使用两种类型的 ASP.NET 控件将单选按钮添加到网页上:各个"RadioButton"控件或一个"RadioButtonList"控件。这两类控件都允许用户从一小组互相排斥的预定义选项中进行选择。使用这些控件,可定义任意数目的带标签的单选按钮,并将它们水平或垂直排列。
命名空间:System.Web.UI.WebControls
程序集:System.Web(在 system.web.dll 中)
[ValidationPropertyAttribute("SelectedItem")]
public class RadioButtonList : ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler
RadioButtonList 控件为网页开发人员提供了一组单选按钮,这些按钮可以通过数据绑定动态生成。该控件包含一个 Items 集合,集合中的成员与列表中的各项相对应。若要确定选择了哪一项,请测试列表的 SelectedItem 属性。
可以用 RepeatLayout 和 RepeatDirection 属性指定如何呈现列表。如果将 RepeatLayout 设置为 RepeatLayout.Table(默认设置),列表将呈现在表中。如果设置为 RepeatLayout.Flow,列表将不以表格形式呈现。默认情况下,RepeatDirection 设置为 RepeatDirection.Vertical。将该属性设置为 RepeatDirection.Horizontal 时,列表将水平呈现。
RadioButtonList用法:
1.RadioButtonList 校验
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("是否为中长期合同为必填项!"); return false; }
2.RadioButtonList样式调整
.rblStyle{width:100%;height:auto;}
.rblStyle input{border-style:none;}
3.onselectedindexchanged事件
像下拉控件dropdownlist控件一样,它也有onselectedindexchanged事件,当选项改变后进行触发
注意点是:控件中的AutoPostBack属性一定设为"True",这样服务器端才知道你的选项改变了,并触发相应事件
4.为ListItem添加提示
RadioButtonList1.Items[0].Attributes.Add("title", "提示内容");
5.绑定数据源
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.改变选中项的前景色
启用 禁用 *禁用的用户将无法登录
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.后台动态增加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的一个单元格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.前台改变选中项的背景色
_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 = ""; } } }感谢你能够认真阅读完这篇文章,希望小编分享的"ASP.NET控件中RadioButtonList的示例分析"这篇文章对大家有帮助,同时也希望大家多多支持,关注行业资讯频道,更多相关知识等着你来学习!
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