How to pass a parameter to event handlers in React
New Course Coming Soon:
Get Really Good at Git
Find out how to pass a parameter to onClick events for example, without invoking the method on mount
When you work on a React function component you might have the need to attach an event to onClick (or other events).
You usually do:
<button onClick={addBill}>Add</button>
But what if you have to pass a parameter? Say you have a list of bills, and you want to remove one by clicking the “X” next to it.
You can’t do:
<button onClick={removeBill(index)}>𝗫</button>
because the expression inside onClick is going to be executed on mount. This is going to delete all the bills in the list, as soon as the app is started.
Instead, this is what you need to do, using arrow functions:
<button onClick={() => removeBill(index)}>𝗫</button>
Are you intimidated by Git? Can’t figure out merge vs
rebase? Are you afraid of screwing up something any time
you have to do something in Git? Do you rely on ChatGPT
or random people’s answer on StackOverflow to fix your
problems? Your coworkers are tired of explaining Git to
you all the time? Git is something we all need to use,
but few of us really master it. I created this course to
improve your Git (and GitHub) knowledge at a radical
level. A course that helps you feel less frustrated with
Git. Launching Summer 2024. Join the waiting list!
→ Get my
React Beginner's Handbook
→ Read my full
React Tutorial
on The Valley of Code
Here is how can I help you:
- COURSES where I teach everything I know
- THE VALLEY OF CODE your web development manual
- BOOTCAMP 2024 cohort in progress, next edition in 2025
- BOOKS 16 coding ebooks you can download for free on JS Python C PHP and lots more
- SOLO LAB everything I know about running a lifestyle business as a solopreneur
- Interesting links collection
- Follow me on X