WebApps with LocalStorage and AppCache/Types of AppLSAC
AppLSACs cannot access the file system like apps on a mobile device or applications on a desktop computer. So in browser any operation about loading and saving to the local filesystem must be triggered by the users (press a button - interaction with the graphical user interface). This is a security feature for browsers so that websites cannot explore your local filesystem without permission.
In general browsers are able to download and upload files from remote servers and the browser can download arbitrary files and of course executables to your local file system and browsers are able to upload files to a remote server.
These basis features (Load/FileReader-API and Save/FileSaverJS) for uploading and downloading files to and from remote servers can be used by programmers of AppLSACs to load files into the browser or save data stored internally in the browser to a file without connecting to or downloading from the internet.
Learning Tasks[edit | edit source]
- (Simple Editor) A simple text editor is used to explain the basic principles of an AppLSAC.
- Explore the basic principles and explain, why a remote server is not necessary to process the data.
Types of AppLSAC[edit | edit source]
This learning resource explains the different types of AppLSAC.
Example AppLSAC-2[edit | edit source]
- into a GitHub/GitLab Mardown language for a README.md for the package.
Examples and Comparison AppLSAC-0, AppLSAC-1 and AppLSAC-2[edit | edit source]
From type AppLSAC-0 towards AppLSAC-2 the design of a WebApp becomes more privacy friendly.
|AppLSAC-0: Wiki2Reveal is a small tool for Wikiversity learning resources. It is an AppLSAC-0, that does not need a save option. If you click on the Link https://niebert.github.io/Wiki2Reveal/index.html the WebApp is loaded from a GitHub-Server. By pressing on the Download-Button the specified article is fetched from the Wikiversity as wiki source and converted into a RevealJS presentation. The browser generates a webbased presentation within the browser and displays the webbased presentation. In this AppLSAC-0 WebApp and loaded data are loaded from different servers (WebApp from GitHub, Data from Wikiversity Server API)||AppLSAC-1: Click on the Link https://niebert.github.io/audioslides4web/index.html and the WebApp is loaded from a WebServer on GitHub. Then generation of the webbased presentation is performed completely in the browser. Images and audio comments for the slides are loaded from the local file system into the browser environment. The loaded files are stored in generated ZIP-file with the library JSZip within the browser and the ZIP-file in the browser environment can be saved as Download event to the local file system for further use. Browsers cannot create files in folders on the file system directly, so the folder structure in the ZIP file is used to store files in folders and provide the folder structure in a single file as AppLSAC-1.||AppLSAC-2: Download the ZIP-file of the repository |
See also[edit | edit source]
References[edit | edit source]
- AudioSlides4Web (2019) Engelbert Niehaus - AppLSAC Repository to create webbased presentation in the browser with connection to the internet - As AppLSAC-1 url application: https://niebert.github.io/audioslides4web - for offline use ZIP: https://github.com/niebert/audioslides4web/archive/master.zip - (accessed 2019/09/14)