有没有办法在asp:dropdownlist上使用html5验证(不是asp:RequiredFieldValidator)。我已经尝试过了:
<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>
我喜欢它与此类似的工作(除了asp:下拉列表):
<asp:TextBox runat="server" required="required"></asp:TextBox>
答案 0 :(得分:2)
我必须摆脱{initialvalue =“0”}并设置初始listitem的{value =“”}:
<asp:DropDownList ID="ExpenseLineTypeDdl" required="required" CssClass="form-control" runat="server">
<asp:ListItem Value="">Please Select a Type</asp:ListItem>
</asp:DropDownList>