asp：dropdownlist上的html5验证 [英] html5 validation on asp:dropdownlist

问题描述

有没有办法在asp：dropdownlist上使用html5验证（不是asp：RequiredFieldValidator）。我已经尝试过这个：

Is there a way to use html5 validation (not asp:RequiredFieldValidator) on an asp:dropdownlist. I have already tried this:

<asp:DropDownList ID="ExpenseLineTypeDdl" required="required" initialvalue="0" CssClass="form-control" runat="server">  
     <asp:ListItem Value="0">Please Select a Type</asp:ListItem>    
</asp:DropDownList>

我希望它与此类似（除了asp：dropdownlist）：

I'd Like it to work similar to this (except for an asp:dropdownlist):

<asp:TextBox runat="server" required="required"></asp:TextBox>

推荐答案

我不得不摆脱{initialvalue =0 }并设置初始listitem的{value =}：

I had to get rid of {initialvalue="0"} and set the initial listitem's {value=""}:

<asp:DropDownList ID="ExpenseLineTypeDdl" required="required" CssClass="form-control" runat="server">  
      <asp:ListItem Value="">Please Select a Type</asp:ListItem>    
</asp:DropDownList>

这篇关于asp：dropdownlist上的html5验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！