November 2024
Intermediate to advanced
372 pages
9h 2m
French
Content preview from Maîtriser la brillance
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Chapitre 9. Chargements et téléchargements
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Le transfert de fichiers vers et depuis l'utilisateur est une fonctionnalité courante des apps. Tu peux l'utiliser pour télécharger des données à des fins d'analyse ou pour télécharger les résultats sous la forme d'un ensemble de données ou d'un rapport. Ce chapitre présente les composants de l'interface utilisateur et du serveur dont tu auras besoin pour transférer des fichiers à l'intérieur et à l'extérieur de ton application. Nous commençons par charger shiny :
library(shiny)
Télécharger
Nous allons commencer par discuter des téléchargements de fichiers, te montrer les composants de base de l'interface utilisateur et du serveur, puis comment ils s'intègrent dans une application simple.
UI
L'interface nécessaire pour prendre en charge les téléchargements de fichiers est simple : il suffit d'ajouter fileInput() à ton interface :
ui<-fluidPage(fileInput("upload","Upload a file"))
Comme la plupart des autres composants de l'interface utilisateur, il n'y a que deux arguments obligatoires : id et label. Les arguments width, buttonLabel, et placeholder te permettent de modifier l'apparence d'autres façons. Je n'en parlerai pas ici, mais tu trouveras plus d'informations à ce sujet dans ?fileInput.
Serveur
La gestion de fileInput() sur le serveur est un peu plus compliquée que celle des autres entrées. ...
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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.