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You can use client side rendering (CSR) ans JSLink to accomplish this. With CSR you can attach a piece of Javascript to a column or to a (edit/new) form. It's also possible to create conditional validations and/or toggle field required properties (based values from other fields). Most popular samples online are here: ...


Go to List tab>List Settings>Validation Settings. Enter =(sum([Event 1],[Event 2],[Event 3]))<=8 in the Formula box. Enter some error text in the User Message box. Now if a user tries to save, and the total tickets is more than 8, it will show the error message, and not submit the form until it is corrected.


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I have the same issue - when I select the correct date from calendar, the validation control does not update its state. I found the solution using the JavaScript and overriding the OnPickerFinish method.. Content part of the page: <SharePoint:DateTimeControl ID="MyDateTimeControl" runat="server" DateOnly="true" /> <asp:CompareValidator ...

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