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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.

Jason

<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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jazzcatone
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jazzcatone
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BardobraveCommented:
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.
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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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BardobraveCommented:
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.
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