Guide 10 · Developer docs

Forms and data capture

Building forms with the Forms module: how a form is put together and placed on a page, validating and branching, presenting it, where submissions are stored, and what happens after one arrives, from jobs and records to CRMs and payments.

L1–L2

Unit 07 of 07 4 pages

Reference

Updated 23/10/2026 01:44

Every element the form builder offers, and the three scripts the platform ships to run a form in the browser: the JS submission model, its conditional logic and its payment element. Look things up here rather than in the units that explain them.

The first page lists every element type the form builder offers, one entry each: what the editor configures, the markup the platform renders, what is stored and what the server validates. The three that follow are the scripts behind other units, not units of their own: the JS submission model, its conditional logic, and its payment element, each written up to the exact attribute, callback and request.

Read Multi-step forms, Branching forms and Taking payments first for what each script does and why; come back here for what it expects and returns.

In this unit

Read in order

01 Form input reference Every element the form builder offers, one entry each: what the editor configures, the markup the platform renders, what is stored, what the server validates, and the accessibility notes. 02 js-forms.js reference The platform's script for the JS model: the markup it expects, the five callbacks and what each receives, the request it sends, what it does with the answer, and how to show an error answer so the visitor sees it and keeps what they typed. 03 js-forms-conditionals.js reference The platform's script that applies a form's conditional logic in the browser: when it starts, the data the layout must print, the markup it looks for, when it re-evaluates, and what it does and does not undo. 04 js-payment-element.js reference The platform's script behind a form's payment element: the markup it binds to, how it takes over two of js-forms.js's callbacks and hands them back, what it adds to the request, and what it does with each kind of answer.