codesnips

forms

html 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Form Validation Example</title>
  <style>

HTML forms with validation and accessibility

html forms validation
by Alex Chang 1 tab
javascript 
import { Application } from "@hotwired/stimulus"
import FormSubmitController from "./controllers/form_submit_controller"

const application = Application.start()
application.debug = false

Disable submit button while Turbo form is submitting

rails hotwire stimulus
by codesnips 3 tabs
javascript 
import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static values = {
    url: String,
    delay: { type: Number, default: 800 },

Stimulus: autosave draft with Turbo-friendly requests

rails stimulus hotwire
by codesnips 3 tabs
typescript 
import axios from 'axios';

export type NormalizedErrors = {
  fields: Record<string, string>;
  formLevel: string | null;
};

Frontend: normalize and display server validation errors

ux typescript react
by codesnips 3 tabs
ruby 
class SubscriptionsController < ApplicationController
  def new
    @subscription = current_account.subscriptions.new
  end

  def create

Turbo Streams: append server-side validation warnings

rails turbo hotwire
by codesnips 4 tabs
typescript 
import { useForm } from 'react-hook-form'
import { PostFormData } from '@/types'

interface PostFormProps {
  initialData?: Partial<PostFormData>
  onSubmit: (data: PostFormData) => Promise<void>

Form handling with React Hook Form

react forms react-hook-form
by Maya Patel 1 tab
ruby 
class PostsController < ApplicationController
  def new
    @post = Post.new
  end

  def create

Inline markdown preview using Turbo Frames

rails hotwire turbo
by codesnips 4 tabs
erb 
<%= form_with url: autosave_draft_path,
              method: :post,
              local: false,
              data: {
                controller: "autosave",
                autosave_target: "form",

Autosave drafts with Stimulus + Turbo (lightweight)

rails hotwire stimulus
by codesnips 3 tabs
ruby 
class Recipe < ApplicationRecord
  has_many :ingredients, inverse_of: :recipe, dependent: :destroy

  accepts_nested_attributes_for :ingredients,
    allow_destroy: true,
    reject_if: :all_blank

Add/remove nested fields with Stimulus (no cocoon)

rails hotwire stimulus
by codesnips 4 tabs
erb 
<!DOCTYPE html>
<html>
  <head>
    <title>Contacts</title>
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

Turbo Frames modal: load, submit, then close via stream

rails turbo hotwire
by codesnips 4 tabs
ruby 
class AtLeastOneOfValidator < ActiveModel::Validator
  def validate(record)
    fields = Array(options[:fields])
    raise ArgumentError, "provide :fields" if fields.empty?

    return if fields.any? { |field| filled?(record.public_send(field)) }

Custom Validator for “At Least One of” Fields

rails activemodel validations
by codesnips 3 tabs
erb 
<h1>Products</h1>

<%= link_to "New product", new_product_path, data: { turbo_frame: "modal" }, class: "btn" %>

<table id="products">
  <tbody>

Turbo Frame modal that renders server HTML

rails hotwire turbo
by codesnips 4 tabs