Stimulus.js Counter Controller - Stimulus-js Typing CST Test
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Stimulus.js Counter Controller — Stimulus-js Code
Basic counter using Stimulus.js with dark/light theme toggle.
<div data-controller="counter" data-counter-dark-value="false" data-counter-count-value="0">
<h2>Counter: <span data-counter-target="count">0</span></h2>
<div>
<button data-action="click->counter#increment">+</button>
<button data-action="click->counter#decrement">-</button>
<button data-action="click->counter#reset">Reset</button>
</div>
<button data-action="click->counter#toggleTheme">Switch Theme</button>
</div>
<script>
import { Application } from '@hotwired/stimulus';
const application = Application.start();
application.register('counter', class extends Stimulus.Controller {
static targets = ['count'];
static values = { count: Number, dark: Boolean };
connect() { this.updateDisplay(); }
increment() { this.countValue++; this.updateDisplay(); }
decrement() { this.countValue--; this.updateDisplay(); }
reset() { this.countValue = 0; this.updateDisplay(); }
toggleTheme() { this.darkValue = !this.darkValue; this.updateDisplay(); }
updateDisplay() { this.countTarget.textContent = this.countValue; this.element.className = this.darkValue ? 'dark-theme' : 'light-theme'; }
});
</script>
<style>
.dark-theme { background-color: #222; color: #eee; }
.light-theme { background-color: #fff; color: #000; }
</style>Stimulus-js Language Guide
Stimulus.js is a modest JavaScript framework designed to enhance static HTML by connecting elements to JavaScript controllers. It complements server-rendered HTML, making it ideal for modestly interactive UIs without a heavy frontend framework.
Primary Use Cases
- ▸Server-rendered apps with light JS enhancements
- ▸Rails and Turbo/Hotwire projects
- ▸Interactive form behaviors
- ▸Small UI widgets
- ▸Progressive enhancement without SPA complexity
Notable Features
- ▸Controller-based architecture
- ▸HTML-driven declarative data bindings
- ▸Lightweight (~3 KB gzipped)
- ▸Easy integration with existing markup
- ▸Automatic event handling via data attributes
Origin & Creator
Created by Basecamp (David Heinemeier Hansson and team) and first released in 2016.
Industrial Note
Stimulus is perfect for server-rendered applications that need modest interactivity, like Rails apps, Turbo-driven frontends, and progressive enhancement use-cases.