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I have a list in Sharepoint 2010 which has a “Choice” type column that can take multiple values through checkboxes. I’m using the default “NewForm” provided to input a new item into the list. I need to perform some validation before a new item gets added depending upon which all checkbox items have been selected. How close can I get to an out-of-the box validation approach as Sharepoint does not allow validations on multivalued Choices by default ?
Use PreSaveAction. This functionality is provided out of the box to allow for custom client side validation.
For more information on PreSaveAction, see how do I validate form fields in sharepoint list?