Feature tours · Field logic and events
Logic that runs at the right moment, and decides for itself
One form shows how logic works in FasterOS: what makes it run, how If blocks decide, how fields appear and disappear, and the form’s own logic as it opens. Every line is picked from a list. All without code.
Try it nowWatch the presentationThis form is one example of what you can build with FasterOS. The same fields, settings and functions build anything you can imagine for your business.
Logic runs when something happens
Each piece of logic belongs to an event on a field:
- Enter: the promo code is checked when Enter is pressed.
- Blur: leaving the email field tidies it, trimmed and in lower case.
- Change: changing the quantity updates the total, with no button to press.
- Click: Reset sets the quantity and total back to zero.
If blocks decide
Lines between If and End If run only when the condition is true. Conditions compare a field with a value: equal or not equal for text and choices, and greater or less than for numbers.
- If quantity >= 10, the bulk price applies; otherwise the standard price shows.
- If plan = Pro, a note about priority support appears.
Conditions on any field
The same works for a choice. Choose the Pro plan and its note appears; choose Basic and the standard note shows.
Show and hide fields from logic
Logic can show and hide other fields. These buttons reveal the details field and hide it again. Values that logic needs only along the way can live in variable fields, which are never shown.
Form logic, as the form opens
A form has its own logic too, which runs as it opens. Here it finds today’s date, then its weekday, then puts together a greeting, each step using the one before.
Try it now
This is the tour's form, live. Type SAVE10 and press Enter, change the quantity to 10 or more, and choose the Pro plan. Nothing you enter is saved.
Events Logic runs when something happens: Enter is pressed, a field is left or changed, a button is clicked. Promo code (press Enter) Promo Email (tidied when you leave it) Email, tidied Quantity Total at $25 each Price Reset If / End If Lines between If and End If run only when the condition is true. Plan Select Plan note Show and hide from logic Buttons that show or hide other fields. Show details Hide details Form logic on load The form’s own logic runs as it opens: today, its weekday, then a greeting. Today October 16, 2026 Weekday Friday Greeting Happy FridayFunctions used in this tour
Picked from a list in Field Logic. Any function can run on any event.
Logic
- if
- and
- or
- not
- equals
- isempty
- coalesce
- greaterthan
- lessthan
Text
- trim
- lower
- upper
- concat
- totext
Date & Time
- today
- weekday
Build anything you can imagine
Field logic and events are one building block. Create a free account and build your own forms the same way, with no code.
Create a free accountWatch the presentation This tour is also an automated test: 17 checks, run against the live product.More tours
Number fields
Decimals, limits, equations that update as you type, formats and built-in math.
Take the tour →Text and choice fields
Text that tidies itself, choices with limits, fields that appear only when they apply, and switches.
Take the tour →Dates and time
Date fields that offer only the right days, several dates in one field, and date math done for you.
Take the tour →AI-powered interfaces
Fields that write their own text, answers from your own data, images described and text read aloud.
Take the tour →Object arrays
Group fields into an object and repeat it: attendees, sessions, line items, each titled by name.
Take the tour → FasterOS homeFeature toursPricing