The need to check for mandatory fields is a very commonly used behavior. It ensures that the user is not able to move to the next page until all required fields have been completed.
Note: Mandatory fields can also be managed in the Layout view by checking the Must Be Answered option on the object properties. However, be aware that mandatory checks made in this way are not performed until the form is submitted. For multi-page forms this could mean having to go back several pages to enter in mandatory data. We recommend using behaviors to perform mandatory checks as a user completes each page.
Complete the following steps to add mandatory field checking to a form:
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Note: It is not possible to assign behavior to the Button is Pressed event on a page or Submit button. If you want to add additional behavior to a button then use a basic Button object for complex behavior sequences.
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Updated: 06/12/2011
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http://www.perfectforms.com/Documentation/manual/html/?checking_for_required_fields.htm
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