July 2019
Intermediate to advanced
310 pages
7h 26m
English
Content preview from Programming ElmBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Display Uploaded Images
Now that you can upload images, let’s display them. In this section, you will use a port to send the new array of images back to Elm. You will also use flags to send Elm the note’s images when embedding the application.
Receive New Images with a Port
When the App component updates its note, it re-renders. It also re-renders the ImageUpload component. Because you pass the note’s images into the images prop, ImageUpload can react to send the new images to Elm.
React has another special method called componentDidUpdate that it calls anytime a component updates after receiving new props from its parent component. You can leverage that inside ImageUpload to grab the new images and send them to Elm. Inside src/ImageUpload.js ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.