The next pro plugin feature is the capability of adding the required field of some calculator elements. In general, a required field is an input field on a form that must have a non-blank value to be valid before submitting a form.
The element with the required field comes with a red asterisk symbol () in the calculator form.
Checkbox, Radio button, Toggle button elements' examples with a notification message:
Dropdown, Quantity elements' examples with a notification message:
The notification message content can be changed in the Calculator Settings: Settings > Notice
There has been created a sample calculator with elements that have the required field:
For each created elements in this calculator contain the toggle button for enabling the required field option, you need to enable that option and save your work:
As the required field works only when there is the submit function in the calculator, after creating the desired calculator, you need to check the submit option in the Settings:
The main thing for the required field works properly is that there should be a submit button in the calculator:
Because after clicking the submit button, the required field does not allow non-chosen elements that have the required field is enabled.