我有两个 DropDownLists
用Year-Dates
填充,并且在第二个DDLS值小于第一个DDLS值的情况下,我想显示一个错误消息。
这是我到目前为止使用的代码,并且它不起作用:
<asp:CompareValidator
ID="cvEndYear2" Operator="GreaterThan" runat="server" CssClass="text-danger"
ValidationGroup="Save" ControlToValidate="ddlEndYear" Display="Dynamic"
ValueToCompare="ddlStartYear" ErrorMessage="Greater Than" SetFocusOnError="true">
</asp:CompareValidator>
您必须指定ControlToCompare
和Operator
:
<asp:CompareValidator
ID="cvEndYear2" Operator="GreaterThan" runat="server" CssClass="text-danger"
ValidationGroup="Save"
ControlToValidate="ddlEndYear" Display="Dynamic"
ControlToCompare="ddlStartYear"
Operator="GreaterThanEqual"
Type="Integer"
ErrorMessage="The end year must be greater/equal the start year" SetFocusOnError="true">
</asp:CompareValidator>
您尚未指定类型,指定文本框中的数据类型:
<asp:CompareValidator
..........
..........
ControlToValidate="ddlStartYear"
ControlToCompare="ddlEndYear"
Operator="GreaterThanEqual"
Type="Integer">
</asp:CompareValidator>
您可能想看看这个教程