Editor’s Note: This post was reviewed for accuracy on 2 March 2023. You can learn more about how Riot.js compares to other newer JavaScript frameworks and to Vue.js to choose the best framework for your use case.
There are a lot of JavaScript frameworks out there, and some are better suited than others for certain aspects of development. The choice of which framework to select really depends on the specific needs of your project.
Riot.js is designed to be lightweight and easy to learn, making it a good choice for developers who are familiar with HTML and JavaScript — without requiring them to learn the rigors of coding with a specific framework. Riot.js emphasizes simplicity, performance, and modularity, its ecosystem allows for easy integration of third-party libraries and components, making it suitable for both small-scale and large-scale projects.
In this tutorial, we’ll take a deep dive into Riot.js, compare it to the native Web Components API, and demonstrate how to use Riot.js to build a simple SPA.
Jump ahead:
The Replay is a weekly newsletter for dev and engineering leaders.
Delivered once a week, it's your curated guide to the most important conversations around frontend dev, emerging AI tools, and the state of modern software.
To follow along with the tutorial portion of this article, you should have:
Riot.js is a lightweight, component-based UI library for developing web applications. Riot.js is similar to other popular JavaScript libraries and frameworks like React, Angular, and Vue.js, giving it an easier learning curve. Although it uses the same component-based approach as these frameworks, Riot.js aims to be smaller and easier to use, focusing on simplicity and flexibility.
Riot.js uses custom tags, combining HTML and JavaScript to form reusable components. With Riot.js, a developer can easily manipulate the DOM with the API feature and bind data to templates.
Some of the critical features of Riot.js include the following:
Riot.js is an excellent choice for developers who desire a simple, lightweight, and flexible library for developing user interfaces. It is especially well-suited for applications where performance and optimization are a concern and where the developer wants the flexibility of selecting and making use of tools or libraries of their choice.
Here are some specific reasons why you should consider using Riot.js:
Riot, at a basic level, is quite similar to the Web Components API, a set of standardized APIs allowing developers to create reusable and modular components for the web.
The Web Components API consists of three main technologies:
<template> and <slot> elements enable you to create markup templates that will not appear on the rendered page; they can also be reused as the foundation of a custom element structureRiot.js and Web Components both strive to simplify the development of reusable and modular web components, but they use significantly different approaches. Web Components uses standardized APIs to construct unique elements and attach them to the DOM, whereas Riot.js employs a template syntax and a limited set of directives to define components.
To better understand how Riot.js works, let’s build a simple SPA consisting of a single page of quotations. We’ll start by setting up the project.
To create a Riot.js project on your local machine, navigate to a directory of your choice on your local machine, open a CLI window, and enter the following command:
npm install -g riot webpack webpack-cli webpack-dev-server
Once installation is completed, create an instance of Riot using a provided template:
npm init riot
For this tutorial, we‘ll make use of the SPA template (webpack-spa):
Once you select the template, a Riot.js project folder will be created in the directory with all the necessary dependencies for creating a Riot.js application.
Open the newly created project in a code editor of your choice. In this Riot.js project folder, you should see a tree structure that looks similar to this:
┣ 📂src
┃ ┣ 📂components
┃ ┃ ┣ 📂global
┃ ┃ ┃ ┣ 📂my-component
┃ ┃ ┃ ┃ ┣ 📜my-component.riot
┃ ┃ ┃ ┃ ┗ 📜my-component.spec.js
┃ ┃ ┃ ┗ 📂sidebar
┃ ┃ ┃ ┃ ┣ 📜sidebar.riot
┃ ┃ ┃ ┃ ┗ 📜sidebar.spec.js
┃ ┃ ┗ 📂includes
┃ ┃ ┃ ┣ 📂loader
┃ ┃ ┃ ┃ ┗ 📜loader.riot
┃ ┃ ┃ ┗ 📂user
┃ ┃ ┃ ┃ ┣ 📜user.riot
┃ ┃ ┃ ┃ ┗ 📜user.spec.js
┃ ┣ 📂pages
┃ ┃ ┣ 📜about.riot
┃ ┃ ┣ 📜home.riot
┃ ┃ ┗ 📜not-found.riot
┃ ┣ 📜app.riot
┃ ┣ 📜index.html
┃ ┣ 📜index.js
┃ ┣ 📜pages.js
┃ ┗ 📜register-global-components.js
┣ 📜.gitignore
┣ 📜LICENSE
┣ 📜package-lock.json
┣ 📜package.json
┣ 📜readme.md
┗ 📜webpack.config.js
Here, the root of our application is index.html, and the main component is to be mounted in the app.riot component. Three routes are specified in the pages directory, and the components that make up these pages are in the components folder.
To run the application, enter the npm start command in the CLI. This will start up the application and produce the following result in the browser:
To begin building our quotes application, we’ll need to create a new quotes page that will fetch the quotes and display them.
Start by creating a new file, ./src/pages/quotes.riot:
Learn more → <quotes>
<section>
<header>
<h1>Quotes</h1>
</header>
<ul class="quotes-list">
<li class="list-item">
<p class=" quote"> "I am not a product of my circumstances. I am a product of my decisions." </p>
<p class="author">- Stephen Covey</p>
</li>
<li class="list-item">
<p class=" quote"> "The best way to predict the future is to create it." </p>
<p class="author">- Peter Drucker</p>
</li>
</ul>
</section>
</quotes>
Here, we’re hardcoding the quotes in order to quickly proceed to setting up the routing configuration for this new page.
In order to add the quotes page component to app.riot, first we need to register the quotes page as a component in our ./src/app.riot file:
<app>
<div class="container">
<!-- ... -->
</div>
<script>
// ...
export default {
components: {
// ...
// register quotes page
Quotes: lazy(Loader, () => import (
/* webpackPrefetch: true, webpackChunkName: 'pages/quotes' */
'./pages/quotes.riot'
))
},
// ...
}
</script>
</app>
Next, we assign the /quotes route to the page component using the ./src/pages.js file, like so:
export default [{
path: '/',
label: 'Home',
componentName: 'home'
}, {
path: '/about',
label: 'About',
componentName: 'about'
}, {
path: '/quotes',
label: 'Quotes',
componentName: 'quotes'
}]
Now, if we navigate to http://localhost:3000/quotes on our browser, we should see something like this:
Awesome!
Next, we’ll fetch quotes data using the DummyJSON publicly available API, https://dummyjson.com/quotes.
First, we’ll create a state object with a quotes property in our component. Then we’ll create an async function, getQuotes(), which will use the native Fetch API to fetch the quotes.
We’ll call the getQuotes() function from the onBeforeMount() lifecycle hook to fetch the quotes before the component is mounted. Here’s how we can achieve that in the ./src/pages/quotes.riot:
<quotes>
<section>
<!-- ... -->
</section>
<script>
export default {
state: {
quotes: [],
},
async getQuotes() {
try {
const res = await fetch(`https://dummyjson.com/quotes`);
const data = await res.json();
this.update({ quotes: data.quotes });
console.log({ quotes: this.state.quotes });
} catch (error) {
console.log({ error });
}
},
async onBeforeMount({ isServer }) {
await this.getQuotes();
},
};
</script>
</quotes>
If we save our changes and check our console, we should see our quotes:
Now, we need to create a component to display each quote from the quotes array.
To create the quote component, create a new file, ./src/components/quote/quote.riot:
<quote>
<article class="quote">
<h3>{props.quote}</h3>
<p>— {props.author}</p>
</article>
</quote>
We have some pretty simple markup here to display, quote and author. We’re also using the props object to access values that will be passed to our component using attributes.
To use this component on our quotes page, we first need to register it. For now, we’ll register it locally in our quotes page component. To do so, add the following to the ./src/pages/quotes.riot file:
<quotes>
<section>
<header>
<h1>Quotes</h1>
</header>
<ul class="quotes-list">
<li each={quote in the state.quotes} key={quote.id} class="list-item">
<quote quote={quote.quote} author={quote.author} />
</li>
</ul>
</section>
<script>
import Quote from "../components/quote/quote.riot";
export default {
components: {
Quote,
},
state: {
quotes: [],
},
// ...
};
</script>
<style>
.quotes-list {
display: grid;
grid-gap: 2rem;
grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.list-item {
display: flex;
}
</style>
</quotes>
Here, we’re using the each directive to loop through the quotes array and pass the quote and the author as props to the Quote component.
At this point, our SPA should look something like this:
Now, let’s see how we can set up dynamic routes in Riot.js to open a single quote on a new page when clicked. We’ll achieve this in just a few steps. First, let’s set up the links href in the ./src/pages/quotes.riot file:
<quotes>
<section>
<!-- ... -->
<ul class="quotes-list">
<li each={quote in state.quotes} key={quote.id} class="list-item">
<a href={`quotes/${quote.id}`}>
<quote quote={quote.quote} author={quote.author} />
</a>
</li>
</ul>
</section>
<!-- ... -->
</quotes>
Clicking on a quote should now take us to /quotes/1 if the quote.id is 1.
Next, let’s create the quote page component and register it in our Riot.js app files.
Start by creating a new file, ./src/pages/quote-page.riot:
<quote-page>
<article class="quote">
<h1>{state.quote.quote}</h1>
<p>— {state.quote.author}</p>
</article>
<script>
export default {
state: {
quote: {},
},
async getQuote() {
try {
const id = this.props.id;
const res = await fetch(`https://dummyjson.com/quotes/${id || 1}`);
const quote = await res.json();
this.update({ quote });
} catch (error) {
console.log({ error });
}
},
onBeforeMount() {
this.getQuote();
},
};
</script>
</quote-page>
Here, we’re once again using props to get the post id. Then, we’ll fetch the quote by its id in the getQuote() function, which is then called in the onBeforeMount lifecycle gist.
Now, let’s register our newest page component in ./src/app.riot:
<app>
<!-- ... -->
<script>
import { Router, Route, route, toRegexp, match } from '@riotjs/route'
import lazy from '@riotjs/lazy'
import Loader from './components/includes/loader/loader.riot'
import NotFound from './pages/not-found.riot'
import pages from './pages'
export default {
components: {
Router,
Route,
NotFound,
Home: lazy(Loader, () => import(
/* webpackPrefetch: true, webpackChunkName: 'pages/home' */
'./pages/home.riot'
)),
About: lazy(Loader, () => import(
/* webpackPrefetch: true, webpackChunkName: 'pages/about' */
'./pages/about.riot'
)),
Quotes: lazy(Loader, () => import(
/* webpackPrefetch: true, webpackChunkName: 'pages/quotes' */
'./pages/quotes.riot'
)),
QuotePage: lazy(Loader, () => import (
/* webpackPrefetch: true, webpackChunkName: 'pages/quote-page' */
'./pages/quote-page.riot'
))
},
}
</script>
</app>
Next, we’ll add a route component with the /quotes/:id route path.
Now, let’s go back to our ./src/app.riot component. In the template, enter the following:
<app>
<div class="container">
<router>
<!-- ... -->
<div if={!state.showNotFound} class="row">
<div class="column column-60">
<route each={page in state.pages} path={page.path}>
<main is={page.componentName}/>
</route>
<!-- add new route for quotes -->
<route path="/quotes/:id">
<main is="quote-page" id={route.params.id} />
</route>
</div>
<!-- notice how <sidebar> is registered as global component -->
<div class="column column-40">
<sidebar/>
</div>
</div>
</router>
</div>
</app>
Here, we add a new route for /quotes/:id where :id is the parameter that will match the quote’s route by id.
Within the <route> component, we’ve set up a dynamic component. We assign it to the Quote page component by passing the "quote-page" component name to the is directive:
That’s it! We’ve used Riot.js to easily and efficiently build a user interface.
In this article, we demonstrated how to create a simple SPA with Riot.js. We covered the basics of setting up a simple Riot.js application with simple routing and local and global component setup using the Riot.js npm package.
We showed how to create functions for data fetching and how to use lifecycle functions to run them before the components are mounted. We also demonstrated how to set up dynamic routing using Riot.js route parameters.
There’s no doubt that frontends are getting more complex. As you add new JavaScript libraries and other dependencies to your app, you’ll need more visibility to ensure your users don’t run into unknown issues.
LogRocket is a frontend application monitoring solution that lets you replay JavaScript errors as if they happened in your own browser so you can react to bugs more effectively.
LogRocket works perfectly with any app, regardless of framework, and has plugins to log additional context from Redux, Vuex, and @ngrx/store. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. LogRocket also monitors your app’s performance, reporting metrics like client CPU load, client memory usage, and more.
Build confidently — start monitoring for free.
:has(), with examplesThe CSS :has() pseudo-class is a powerful new feature that lets you style parents, siblings, and more – writing cleaner, more dynamic CSS with less JavaScript.
Kombai AI converts Figma designs into clean, responsive frontend code. It helps developers build production-ready UIs faster while keeping design accuracy and code quality intact.
Discover what’s new in The Replay, LogRocket’s newsletter for dev and engineering leaders, in the October 22nd issue.
John Reilly discusses how software development has been changed by the innovations of AI: both the positives and the negatives.
Hey there, want to help make our blog better?
Join LogRocket’s Content Advisory Board. You’ll help inform the type of content we create and get access to exclusive meetups, social accreditation, and swag.
Sign up now
2 Replies to "Using Riot.js, a component-based UI library"
It’s great, but I think I will stick with Vue.
Nice article, but there is an error when adding a quote-page, probably the onAnyRoute function needs to be modified to handle this new page as it is displaying an not found page.