Knowella

Conditional logic & required fields

Make forms adapt to the answer — show the right fields and enforce the ones that matter.

4 min read Real product screens
app.knowella.com Live walkthrough
The best forms ask as little as possible. Conditional logic is how you get there: fields stay hidden until an answer makes them relevant, so an inspection that could run to forty questions only ever shows the eight that apply. Required fields handle the other half of the problem — making sure the answers you cannot do without are never left blank. This walkthrough sets both up on a live form.
In this article

Rules attach to a single field

The tour opens with a component selected on the canvas and its controls visible. Logic is not a separate screen or a scripting panel — it belongs to the field, which means anyone editing the form can see why a question appears without hunting for the rule that governs it.

Show a field only when it is relevant

The walkthrough builds the classic case: a check comes back as a fail, and only then does the form ask for the corrective action, the severity and the photo. Answer pass and none of it appears. The person filling it in never scrolls past questions that do not apply to them, which is most of why paper checklists get rushed.

  • TriggerAny earlier answer — a choice, a checkbox, a number crossing a threshold.
  • EffectReveal a field or a whole section, or branch down a different path.
  • StackingSeveral conditions can gate the same field.

Enforce what cannot be missing

The required toggle blocks submission until a field is answered. Combined with logic it becomes precise rather than blunt: the photo is only mandatory on the path where a photo actually matters, so you are not forcing every clean inspection to attach an image of nothing.

Why it matters

Long forms get abandoned, and forms that let anything through produce records you cannot rely on later. Logic and required fields pull in opposite directions on purpose — shorter to fill in, harder to submit incomplete — and that combination is what makes the data trustworthy when it reaches a dashboard or an auditor.

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