ASP.NET Validating for Valid Time Input

I have a textbox where by a time of day is entered. I would like to validate that  a valid time (such as 08:00am) has been entered. At the same time, I do not want to require any input at all.User can leave the box blank if they want.I have an Ajax Extender to help the user enter a valid time if they so choose.

 Also, I would like to only warn the user of entering an invalid time when (and only when) the submit button is clicked. It seems the problem with setting EnableClientScript=true is that if the user clicks inside the text box and and then clicks out the client side validator fires right away. I do not want this.

Further complicating this is it seems that currently simply leaving EnableClientScript=false and Enabled=true(server side validator) doesn't seem to be working at all. It just lets the input through.  How do I get this to work in the manner I have just described. Any advice would be greatly appreciated. .aspx markup is below.


<asp:TextBox ID="tbCompTime" runat="server" ValidationGroup="grpMainDriver"   MaxLength="10" />
<ajx:MaskedEditExtender ID="meecomptime"  runat="server"   AcceptAMPM="true"   TargetControlID="tbCompTime"  Mask="99:99"  MaskType="Time" MessageValidatorTip="true"> </ajx:MaskedEditExtender> 
<ajx:MaskedEditValidator  ID="mevcomptime" EnableClientScript="false" Enabled="true" ValidationGroup="valComplaintGroup"   runat="server"  ControlToValidate="tbCompTime"  ControlExtender="meecomptime"  IsValidEmpty="True"  InvalidValueMessage="Time not valid"  >   </ajx:MaskedEditValidator>

<asp:Button runat="server" CausesValidation="true" ValidationGroup="valComplaintGroup" id="btnSubmitComplaint" OnClick="btnSubmitComplaint_click" Text ="Submit Complaint"/>

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BardobraveConnect With a Mentor Commented:
I think you can do it in both ways, however I'm not used to work with .aspx markup and don't know how to do it.
Your client validation should be able to manage that the time is empty.

So allow on your client function an empty value and fire that function only on form submit.
jazzcatoneAuthor Commented:
So would I have to write the javascript for this? Or is there a way to do this strictly through the .aspx markup
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