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DropDownList的值去控制TextBox是否可编写
發布時間：2025/5/22
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DropDownList的值去控制TextBox是否可编写
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Web窗體上有兩控件，DropDownList1，TextBox1，當DropDownList的值選擇是YES的時候，TextBox1可編輯，當選擇NO的時候，TextBox1的值為空，并且不能編輯，該如何實現?
效果：
?
.aspx:
View Code <%@?Page?Language="C#"?AutoEventWireup="true"?CodeFile="Default.aspx.cs"?Inherits="_Default"?%><!DOCTYPE?html>
<html?xmlns="http://www.w3.org/1999/xhtml">
<head?runat="server">
????<title></title>
</head>
<body>
????<form?id="form1"?runat="server">
????????<asp:DropDownList?ID="DropDownListYesNo"?runat="server"?AutoPostBack="true"?OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
????????</asp:DropDownList>
????????<asp:TextBox?ID="TextBox1"?runat="server"?Enabled="true"></asp:TextBox>
????</form>
</body>
</html>
?
.aspx.cs:
View Code using?System;using?System.Collections.Generic;
using?System.Data;
using?System.Linq;
using?System.Web;
using?System.Web.UI;
using?System.Web.UI.WebControls;
public?partial?class?_Default?:?System.Web.UI.Page
{
????protected?void?Page_Load(object?sender,?EventArgs?e)
????{
????????if?(!IsPostBack)
????????{
????????????Data_Binding();
????????}
????}
????private?void?Data_Binding()
????{
????????this.DropDownListYesNo.DataSource?=?GetData().Select(yn?=>?new?{?value?=?yn?}).ToList();
????????this.DropDownListYesNo.DataTextField?=?"value";
????????this.DropDownListYesNo.DataBind();
????}
????protected?void?DropDownList1_SelectedIndexChanged(object?sender,?EventArgs?e)
????{??????
????????switch?(this.DropDownListYesNo.SelectedItem.Text)
????????{
????????????case?"YES":
????????????????this.TextBox1.Enabled?=?true;
????????????????break;
????????????case?"NO":
????????????????this.TextBox1.Enabled?=?false;
????????????????this.TextBox1.Text?=?string.Empty;
????????????????break;
????????}
????}
????private?List<string>?GetData()
????{
????????List<string>?yn?=?new?List<string>();
????????yn.Add("YES");
????????yn.Add("NO");
????????return?yn;
????}
}
?
?
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