How to use window.confirm()

How to use the confirm() API offered by browsers to let the user confirm

⭐️ 👀 2023 WEB DEVELOPMENT BOOTCAMP starting in days! Join the waiting list to reserve your spot in my 10-weeks cohort course and learn the fundamentals, HTML, CSS, JS, Tailwind, React, Next.js and much much more! 👀 ⭐️

confirm() lets us ask confirmation before performing something.

This API dates back to the dawn of the Web, and is supported by every browser.

It’s very simple and I think it might come handy in many different cases without reaching for a custom-built UI.

Here’s how it works: you call confirm(), passing a string that represents the thing we want to confirm, which is shown to the user:

confirm("Are you sure you want to delete this element?")

This is how it looks in Chrome:

This is in Safari:

This is in Firefox:

As you can see it’s rendered slightly differently in each browser, but the concept is the same.

You should call window.confirm(), but since window is implicit, confirm() works

The browser blocks the script execution until the user clicks any of the OK or Cancel button. You can’t escape from that without clicking a button.

The call to confirm() returns a boolean value that’s either true, if the user clicks OK, or false if the user clicks Cancel, so we can assign it to a variable, or also use it in a conditional:

const confirmed = confirm("Are you sure you want to delete this element?")
if (confirm("Are you sure you want to delete this element?")) {
  console.log('confirmed')
}

One more thing! ⚠️ ✋

At the end of January I will organize the Web Development Bootcamp.

It's a 10-weeks long cohort online course where I will guide you to becoming a Web Developer.

It's not "just a course". It's a big event I organize once a year.

We'll start from zero, learn the fundamentals of Web Development, HTML CSS, JavaScript, Tailwind, Git, using the command line, VS Code, GitHub, Node.js, we'll then learn React, JSX, how to use PostgreSQL, Astro, Next.js, Prisma, deploying on Netlify/DigitalOcean/Fly/Vercel and much more! 

At the end of the first 10 weeks you'll know how to create web sites and web applications and I'll unlock you the 2nd phase of the Bootcamp: you will get access to a large number of projects exclusive to the Bootcamp graduates, so you can follow my instructions to build things like private areas with authentication, clones of popular sites like Twitter YouTube Reddit, create e-commerce sites, and much much more.

Because once you got the fundamentals, you only learn by working on real, exciting projects.

To find out more, visit bootcamp.dev