TextBox.MaxLength 屬性
擷取或設定文字框中最多允許的字元數
文字框中最多允許的字元數。預設值為 0，表示未設定該屬性。
使用 MaxLength 屬性限定可以在 TextBox 控制項中輸入的字元數。
注意 :僅當 TextMode 屬性設定為 TextBoxMode.SingleLine 或 TextBoxMode.Password 時，此屬性才適用。
關於TextBox的MaxLength無效問題
方法一： 驗證控制項(經實踐可行)
驗證控制項
| 代碼如下 | 複製代碼 |
| <asp:TextBox ID="txtConclusion" MaxLength="200" TextMode="MultiLine" Height="100px" Width="400px" runat="server" /> <asp:RegularExpressionValidator ID="txtConclusionValidator1" ControlToValidate="txtConclusion" Text="超過200字" ValidationExpression="^[sS]{0,200}$" runat="server" /> |
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方法二：添加一些用戶端限制的JS代碼。樣本如下：
代碼
| 代碼如下 | 複製代碼 |
| <HTML> <HEAD> <title>WebForm6</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> <script language="javascript"> function isOver(sText,len) { var intlen=sText.value.length; if (intlen>len) { alert("The content length must Less than or Equal "+len); sText.focus(); sText.select(); } } </script> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:TextBox id="txtName" style="Z-INDEX: 102; LEFT: 200px; POSITION: absolute; TOP: 104px" runat="server" TextMode="MultiLine" Height="112px" Width="271px"></asp:TextBox> </form> </body> </HTML> Public void Page_Load(object sender, System.EventArgs e) { this.txtName.Attributes.Add("onblur","isOver(this,1000);"); } |
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