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svelte-formula
Advanced tools
Changelog
[0.8.7] - 2021-02-23
data-in-group
attribute set which allows for better filtering of groups from form dataReadme
Formula is a library for Svelte with features for creating Zero Configuration reactive forms and fully data-driven applications.
Out-of-the box it's designed to work with HTML5 forms. Configuring your forms validation is as easy as setting attributes, and doesn't get in the way of things like Accessibility. You can also add additional validations, custom messages and computed values through optional configuration to enhance your forms and their UI.
Formula also supports multi-row forms with Beaker - an API for working with rich forms for collections of data.
npm i svelte-formula
All you need is an element container with the Svelte use directive and form input
fields with their name
property set.
<script>
import { createEventDispatcher } from 'svelte';
import { get } from 'svelte/store'
import { formula } from 'svelte-formula@0.8.2'
const { form, isFormValid, validity, touched, submitValues } = formula();
const dispatcher = createEventDispatcher()
// Allow components to accept value that can be used as default values
export let userName = '';
// You can calculate values for valid UI states
$: usernameInvalid = $touched?.userName && $validity?.userName?.invalid
// Handle submission of data easily to parent components or services
function submitForm() {
dispatch('updateUser', {
user: get(submitValues)
})
}
</script>
<!-- Use as form element to get full form submission validation-->
<form use:form on:submit|preventDefault={submitForm}>
<div class="form-field">
<label for="userName">User Name</label>
<input type="text" id="userName" name="userName" required minlength="8" class:error={usernameInvalid} bind:value={userName} />
<span hidden={!usernameInvalid}>{$validity?.userName?.message}</span>
</div>
<button disabled={!$isFormValid} type="submit">Update User Name</button>
</form>
<style>
.error {
border: 1px solid hotpink;
}
</style>
Visit the documentation for more details API instructions.
FAQs
Reactive Forms for Svelte
We found that svelte-formula demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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