Offline-capable applications with HTML5
Without a Net
An offline cache in your browser and a bit of HTML5 acrobatics combine for interactive web applications that keep working even when the Internet connection breaks down.
Web browsers were originally simply viewers for static HTML documents. Since HTML2, browsers have had the capability to capture simple user input with forms and send it to a database on the Internet. For this to work, of course, the system must be connected to the Internet. At every disturbance of the network connection, exasperated users lose their work.
HTML5 [1] includes some powerful features that let web applications operate offline. In this article, I introduce these offline technologies in detail. I'll also show you how to build an example application that implements an offline-capable tool for saving geo-coordinates (geolocations). This app runs on any devices that supports HTML's offline features, including Firefox (currently v14) , Opera (v12), Chrome (v21), Safari, and Internet Explorer (v9).
Understanding Offline HTML
To operate without an Internet connection, an offline HTML5 app must keep an offline copy of the application and any application data. HTML5 defines the following components:
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
System76 Refreshes the Lemur Laptop
If you're looking for a laptop with tons of power and battery, look no further than the latest iteration of the System76 Lemur Pro.
-
More than 43 Million Lines of Code in Linux Kernel 7.2
Using the cloc utility, Michael Larabel of Phoronix discovered that Linux kernel 7.2 has over 43 million lines of code.
-
Kubuntu Focus Goes Ultra
The Kubuntu Focus team has upped the performance ante of its M2 and Zr laptops with the latest, greatest CPUs from Intel.
-
Linux Gamers May Soon See Less Mouse Lag in KDE Plasma
Gamers using KDE’s Plasma desktop have been suffering from a slight input delay in mouse movement that could lead to getting fragged.
-
Three Lines of Code Improve Linux Storage Performance
A developer changed three lines of code, giving Linux storage performance a 5% bump.
-
AUR Hit Again with Malicious Packages
Once again the Arch User Repository is plagued by a high volume of malicious packages.
-
Alpine Linux 3.24 Features Fresh Desktops and a Newer Kernel
If you're a fan of Alpine Linux, it's time to upgrade because the latest version has been released with KDE Plasma 6.6, Gnome 50, and Linux kernel 6.18 LTS.
-
EU Open Source Strategy Plays Key Role in Tech Sovereignty Package
Comprehensive measures adopted by the European Commission aim to reduce dependency on non-EU countries.
-
Linux Foundation Report Indicates AI Driving Tech Hiring
Within growing security and skills gaps, AI has been found to be a positive driving force behind tech hiring trends in Europe.
-
United Nations Open Source Portal Goes Live
A new open source portal seeks to coordinate and scale open source efforts across the United Nations system.