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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Upload Images with Ports
Currently, the new image upload feature only opens a file prompt. You need to access the selected files to actually upload them. This presents an interesting problem for Elm. Elm is a pure language, so it can’t directly access the DOM to retrieve the selected files.
But, JavaScript easily interacts with the DOM. You just need Elm and JavaScript to talk with each other. They haven’t been on speaking terms up to this point. Maybe JavaScript is a little jealous of Elm. Let’s help them reconcile with ports.
In this section, you will use ports to notify JavaScript that a user has uploaded images from Elm. Then, you will use JavaScript to read the images’ file data and update the note with images.
Notify JavaScript with a Port ...
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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.