Oracle Visual Builder: Applications That Outlive Their First Release · Module 10 · Validation and error handling
Field-level and form-level
Lesson 101 of 176 · 3 min
What to check AS SOMEBODY TYPES and what to check WHEN THEY SUBMIT. Getting this backwards is WHY FORMS FEEL HOSTILE. The two are not interchangeable, and the difference is entirely about when a rule can fairly be applied to someone mid-task. THE HOSTILE FORM IS THE ONE THAT VALIDATES A FIELD BEFORE THE PERSON HAS FINISHED WITH IT. Type the first character of an email address and be told it is invalid. Enter one digit of a phone number and see a red message. Every one of those complaints is technically correct and arrives while the user is doing exactly the right thing. SO FIELD-LEVEL VALIDATION SHOULD FIRE ON LEAVING THE FIELD, NOT ON EACH KEYSTROKE. Leaving is the signal that the person considers it finished. The exception is a field with a live constraint the user needs while typing — a character counter approaching a limit — and…
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