如何：使用自定义函数对 ASP.NET 服务器控件进行验证

使用 ECMAScript (JavaScript、JScript) 创建验证函数。

下面的代码示例解释了自定义客户端验证。源自页的摘要将显示由 CustomValidator 控件引用的 TextBox 控件。验证控件调用名为 validateLength 的客户端脚本函数，以确认用户在 TextBox 控件中输入了至少 8 个字符。

Visual Basic

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<script type="text/javascript">
  function validateLength(oSrc, args){
   args.IsValid = (args.Value.length >= 8);
}
</script>

C#

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<script type="text/javascript">
  function validateLength(oSrc, args){
   args.IsValid = (args.Value.length >= 8);
}
</script>

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Visual Basic

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<asp:Textbox id="text1" runat="server" text=""></asp:Textbox>
<asp:CustomValidator id="CustomValidator2" runat="server" 
 ControlToValidate = "text1"
 ErrorMessage = "You must enter at least 8 characters!"
 ClientValidationFunction="validateLength" >
</asp:CustomValidator>

C#

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<asp:Textbox id="text1" runat="server" text=""></asp:Textbox>
<asp:CustomValidator id="CustomValidator2" runat="server" 
  ControlToValidate = "text1"
  ErrorMessage = "You must enter at least 8 characters!"
  ClientValidationFunction="validateLength" >
</asp:CustomValidator>