Your questionnaire may contain fields that require input from the user. Some uses of these questions would be for the collection of demographic data on the survey participants.
We can design items on your questionnaire using three different input modes:
Both the "Warn if left blank" and "Required" modes will display a JavaScript alert box if the participant leaves the item blank on the questionnaire. However, the participant will be unable to proceed with other pages on the questionnaire if the field is required and they left it blank.
Also, the software will place the focus of the cursor on the item that needs to be responded to.
You have complete control over what messages are displayed and under what conditions.