March 2025
Intermediate to advanced
286 pages
5h 53m
Italian
Content preview from Web API Cookbook
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Capitolo 10. Lavorare con i file
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Introduzione
La lettura di e la scrittura di file fanno parte di molte applicazioni. In passato, non era possibile lavorare con i file locali all'interno del browser. Per leggere i dati, dovevi caricare un file su un server backend, che lo elaborava e restituiva i dati al browser.
Per scrivere dati, il server inviava un file scaricabile. Senza i plug-in del browser, non c'era modo di lavorare direttamente con i file.
Oggi i browser dispongono di un supporto di prim'ordine per la lettura e la scrittura dei file. Il tipo di input file apre un selezionatore di file e fornisce dati sul file selezionato. Puoi anche limitare i file supportati a specifiche estensioni o tipi MIME. Da qui, l'API File può leggere il contenuto del file nella memoria.
Facendo un ulteriore passo avanti, l'API File System permette al tuo codice JavaScript di interagire direttamente con il filesystem locale, senza bisogno di un input per selezionare un file (anche se, a seconda delle impostazioni, l'utente potrebbe dover concedere il permesso!).
Puoi utilizzare queste API per creare editor di testo, visualizzatori di immagini, lettori audio o video e molto altro.
Caricare il testo da un file
Problema
Vuoi caricare alcuni dati di testo dal filesystem locale dell'utente.
Soluzione
Utilizza il sito <input type="file"> per selezionare il ...
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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.