f-form

Simple immutable form management for Clojure(Script).

Installation

Install from Clojars:

Install unreleased sha from Github (assuming Clojure CLI 1.10.3.933 or higher):

# deps.edn
{:deps
  {com.github.mainej/f-form {:git/sha "<recent sha>"}}}

Updating? See the CHANGELOG.md.

Background

f-form aims to be a pared down functional Clojure version of Final Form, a JS library for managing form state.

The primary goal of a form, on the web or in a CLI, is to collect data from a user. But data entry is only part of the story. Many UIs need to remember and respond to the various ways that a user might interact with a form. As a form designer, you may want to show a user which fields they have completed, are currently working on, or still have to finish. You may want to warn them about invalid data, but only after they have interacted with an invalid field. You may want to prevent form submission until all errors are resolved, until certain data is entered or changed, or while a previous submission is in flight. There's a lot to keep track of besides the values that the user has entered.

At the same time, there are only a few actions a user can take. They can start a form, switch between fields, enter data, and submit.

f-form provides a minimal set of tools to define forms and their fields and track a user's interactions.

But most form libraries do this. What makes f-form unique is what it doesn't do:

No state management. The f-form suite of tools accepts and returns immutable forms that contain field values and a summarized history of a user's interactions with them. But that's not enough... an app has to store those forms and update them over time. f-form expects you to choose and use your own state manager. The ClojureScript community has a rich set of options for managing state. If you are using React, you may want to store state locally with reagent, or in a re-frame app-db. If you are using f-form in another context, the choice is up to you.
No HTML or CSS. f-form makes no decisions about how DOM elements are generated or how to style them. Actually, it doesn't care whether you are working in the DOM, in a CLI, or elsewhere. Instead, it provides the data you need to make your own UI. It aims to do this efficiently by tracking only the interactions you care about.
No validation. Though f-form expects that you will validate your forms, it does not require validation or any particular validation library, nor does it introduce its own validation syntax. Validation happens externally, not internally. f-form provides a sample, optional, set of tools for client-side validation with vlad, and contributions for other validation libraries are welcome, but these will always be opt-in.
No submission logic. f-form helps you decide whether to submit, but not how to submit. The tradeoff is that you have to inform f-form when you are submitting.

Learn more

Run an example reagent project that uses f-form.
See the API Docs.
Review the code and tests.
Interested in contributing? Review the contributing guidelines.

Alternatives

luciodale/fork is another good option. It does a lot of state management internally, which ties it to reagent or re-frame and hides some useful functionality.
efraimmgon/reframe-forms, as the name suggests, is closely tied to re-frame. It generates the HTML and does its own state management.
jkk/formative is the maximal approach including validation, rendering, even server-side parsing.

License

Distributed under the MIT License.