January 2019
Intermediate to advanced
460 pages
10h 33m
English
Content preview from Hands-On Full-Stack Web Development with GraphQL and React
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Controlled components
When we wrote our post form to submit new posts or the message inputs inside chat in the previous chapters, we used controlled input by incident. To provide a better understanding, I am going to quickly explain the difference between controlled and uncontrolled components, and when to use each of them.
Let's start with uncontrolled input.
By definition, a component is uncontrolled whenever the value is not set by a property through React, but only saved and taken from the real browser DOM. The value of an input is then retrieved from a reference to the DOM Node, and is not managed and taken from React's component state.
The following code shows the post form where the user will be able to submit new posts. I have excluded ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.