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When you make a field required, people must enter an answer to the field in order to submit their entry. When someone tries to submit an entry without filling out a required field, we highlight the problematic fields and display an error message to let them know the field is required.

Summary: Using an asterisk to mark required fields is an easy way to improve the usability of your forms. Only marking optional fields makes it difficult for people to fill out the form.

How to indicate a required field Provide the required text in the label. Provide a graphic image in the label with appropriate alt text. Providing a star (asterisk) symbol. Use of color to identify if a form control is required. Providing HTML5 and ARIA required attributes.

How to make a field required in a PDF Form Open the necessary PDF form, choose Forms & Signatures > Prepare Form. Select the field that needs to be required, right click on it and choose Set as a Required Field: Save changes.

Select the field that you want to require always has a value. In the Field Properties pane, on the General tab, set the Required property to Yes.

Try to avoid optional fields in forms. But if you use them, at least clearly distinguish which input fields may not be left blank. The convention is to use an asterisk () for required fields or the word ?optional? for non-required fields (which is preferable in long forms with multiple required fields).

RequiredFieldValidator is to make an input control a required field . The input control fails validation if the value it contains does not change from its initial value when validation is performed. This prevents the user from leaving the associated input control unchanged .