Feature tours · Number fields

Number fields that calculate, format and check themselves

One form shows every number option in FasterOS: number, currency and percent fields sized to what they hold, equations that update the moment an input changes, results formatted as currency, numbers, percents or dates, and limits that keep values in range. All without code.

This 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.

Number, currency and percent

Three field types hold numbers. Each takes the same settings, and each input is only as wide as the values it holds, so a form reads cleanly.

• Decimals: how many digits a value keeps and shows.
• Min value and Max value: a value outside the range is pulled back to it, whether someone types it or a calculation writes it. A minimum of 0 keeps prices and counts from going negative.
• Width: from 4em for a two-digit quantity to 12em for large amounts. New fields get a width that fits their type.

Equations that update as you type

Calculations are equations on the fields themselves. Subtotal is {quantity} × {unitPrice}, the discount comes off, and so on. Each input runs them whenever it changes, so there’s no Calculate button to press.

• Write equations with +, −, ×, ÷ and any field in {braces}.
• Chain results: one equation can use another’s result.
• Add a change rule to each input, and every result follows any edit.

Results, formatted

A Result field shows a calculated value the way it should read. Choose a Format and Decimals in its settings.

• Currency: $539.89. Number: 599,880. Percentage: 10%.
• Short date, Long date and Time, in each visitor’s own format.
• Decimals rounds: 539.89 with 0 decimals shows 540.

Change one value, everything follows

Change Quantity from 12 to 2 and every result recalculates: subtotal $99.98, total $89.98, and shipping is no longer free.

Values stay in range

Type 500 into Quantity and it becomes 100, its maximum, the moment you leave the field. Everything calculated from it updates too.

Try it now

This is the tour's form, live. Type a quantity, price, discount and weight, and watch every result update. Nothing you enter is saved.

Open it on its own page →

Functions used in this tour

Picked from a list in Field Logic. Each one works on any number field.

Math

• sqrt
• pow
• max
• min
• round
• abs

Format

• currency
• formatnumber
• percent
• convertunits

Logic

• greaterthan
• lessthan
• if

Financial

• monthlypayment
• futurevalue
• presentvalue
• netpresentvalue

Build anything you can imagine

Number fields are one building block. Create a free account and build your own forms the same way, with no code.

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