Svelte Forms for Craft CMS & Formie

This is a repo which is useful for Craft CMS in its headless configuration with using the plugin formie. It allows you to simply install the dependencies, style your components without further configuration.

Requirements

• Craft CMS > 5.0
• Formie > 3.0
• Craft CMS's GraphQl Schema enabled
• Enable all fields in the Formie Settings, which this plugin supports

If you are using the File Input, please be sure to enable mutation (creation) of assets in your graphql schema.

Installation & Setup

In your frontend code run

npm install svelte-craftcms-headless-formie

Enable Views for the formie forms and creation of submission in the graphql schema.

Usage

In your svelte file, import the component. And add the form handle and the public CMS API url. The Form handle can be passed in dynamically, as the form will be fetched client side.

<script lang="ts">
    import { PUBLIC_CMS_API } from '$env/static/public';
    import FormieForm from 'svelte-craftcms-headless-formie';
</script>

<FormieForm handle="your-form-handle" publicCmsApi={PUBLIC_CMS_API} />

Snippets

You can pass in multiple snippets:

• submitButton (required): Pass in a custom submit button (type submit)
• skeletonSnippet (optional): Will be rendered during the initial client side fetch. It is meant as a placeholder for skeleton loaders.
• errorSnippet (optional): will be rendered if the initial load of the form will throw an error.
• afterSubmitSnippet (optional): allows to render a custom submission message after a submission, disregarding wether it is an error or success.
• pagination (optional): rendering component used to display ui relevant for multistep form

Props

Prop	Description	type	default
handle	the form handle	string (required)	-
submitButton	your custom submitButton (type="submit")	Snippet (required)	-
publicCmsApiKey	the cms api url, where the submission has to be sent to	string (required)	-
siteId	siteId, which the submission should be submitted to.	string | number | undefined	undefined
recaptchaKey	if recaptcha is setup in formie, pass in the recaptcha key	string | undefined	undefined
isLoading	allows you to bind to a loading state during the submission	boolean | undefined	false
class	optional classes will can be directly used to style the <form> element	string | undefined	''
skeletonSnippet	renders a skeleton loader snippet	Snippet | undefined	undefined
afterSubmitSnippet	renders a snippet after the submission. The message displayed will contain the elements from craft formie.	Snippet | undefined	undefined
errorSnippet	renders an error snippet if an error is caught during inititial render. In contrary to afterSubmitSnippet, this Snippet will allow you to render totally custom components.	Snippet | undefined	undefined
pagination	Snippet used to display UI relevant with multistep forms	Snippet	undefined
recaptchaHint	renders a snippet as a hint for recaptcha. Will only be shown, if a recaptchaKey is provieded	Snippet | undefined	recaptchaHintSnippet.svelte
onaftersubmit	callback fired after submit. The event passed contains a message (defined in formie) aswell as the error state	(message: string | null, isSuccess: boolean) => void | undefined	undefined

Multistep forms

If you have a multistep form, use the multistep snippet, to display further information:

{#snippet pagination({ currentIndex, totalPages, backBtn, nextBtn })}
    <div>
        {currentIndex + 1} / {totalPages}
        {#if backBtn}
            <button type="button" onclick={backBtn.onclick}>{backBtn.text}</button>
        {/if}
        {#if nextBtn && currentIndex + 1 !== totalPages}
            <button type="button" onclick={nextBtn.onclick}>{nextBtn.text}</button>
        {/if}
    </div>
{/snippet}

Be aware, that a type="button" for pagination buttons is necessary. Otherwise, the form will be submitted before reaching the end.

Styling

In your main css file just apply all the styles to the input fields.

<FormieForm/> Component does have a structure like this:

<form data-formie-form>
    <div data-form-page="1">
        <!-- the number resemblences the current form page -->
        <div data-formie-field>
            <!-- wrapper for each input -->
            <div data-formie-field-single-line-text>
                <!-- data-attribute for top html element of given input type -->
                ...
            </div>
        </div>
    </div>
</form>

The data-formie-field-* attribute stands for the top html element of a given input type. Those are the available data-attributes:

• data-formie-field-address
• data-formie-field-agree
• data-formie-field-checkboxes
• data-formie-field-date
• data-formie-field-dropdown
• data-formie-field-email
• data-formie-field-heading
• data-formie-field-multi-line-text
• data-formie-field-name
• data-formie-field-number
• data-formie-field-phone
• data-formie-field-radio
• data-formie-field-single-line-text
• data-formie-field-fileupload
• data-formie-recaptcha-hint
• data-formie-field-error

Those data-attributes can be used to selectively target the fields / elements.

[data-formie-field-email] {
    border: solid 1px black;
}

Error Styling

When a submission is not returned with errors from Craft CMS, the regarding input fields will be automatically set with an aria-invalid="true" flag. On resubmit, this will be set to false. This can be used to style invalid form-fields:

[data-invalid='true'],
[data-formie-field-error] {
    color: red;
}

Example

<script lang="ts">
    import { FormieForm } from '$lib/index.js';

    let isLoading = $state(false);
</script>

<FormieForm
    handle="your-form-handle"
    publicCmsApi="https://your-graphql-endpoint.dev"
    onaftersubmit={(e) => console.log(e)}
    bind:isLoading
>
    {#snippet skeletonSnippet()}
        this is a skeleton fallback
    {/snippet}

    {#snippet submitButton({ text })}
        <button>{text}</button>
    {/snippet}

    {#snippet afterSubmitSnippet({ state })}
        <p style="color: {state.isSuccess ? 'green' : 'red'}">
            {state.message}
        </p>
    {/snippet}

    {#snippet errorSnippet()}
        <p>This is an error message</p>
    {/snippet}
</FormieForm>

Limitations

Currently, only the following formie Fields are supported:

• Address
• Agree
• Checkboxes
• Date / Time
• Dropdown
• Email Address
• Heading
• Multi-line Text
• Name
• Number
• Phone Number
• Radio Buttons
• Single-line Text
• File Upload

Be sure to enable / disable those fields accordingly in your formie settings.