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Xây dựng ứng dụng cho Android với HTML, CSS và javascript - part 12

Tham khảo tài liệu 'xây dựng ứng dụng cho android với html, css và javascript - part 12', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 6 Going Offline There s a feature of HTML5 called the offline application cache that allows users to run web apps even when they are not connected to the Internet. It works like this when a user navigates to your web app the browser downloads and stores all the files it needs to display the page HTML CSS JavaScript images etc. . The next time the user navigates to your web app the browser will recognize the URL and serve the files out of the local application cache instead of pulling them across the network. The Basics of the Offline Application Cache The main component of the offline application cache is a cache manifest file that you host on your web server. I m going to use a simple example to explain the concepts involved then I ll show you how to apply what you ve learned to the Kilo example we ve been working on. A manifest file is just a simple text document that lives on your web server and is sent to the user s device with a content type of cache-manifest. The manifest contains a list of files a user s device must download and save in order to function. Consider a web directory containing the following files index.html logo-jpg scripts demo.js styles screen.css In this case index.html is the page users will load in their browsers when they visit your application. The other files are referenced from within index.html. To make everything available offline create a file named demo.manifest in the directory with index.html. Here s a directory listing showing the added file demo.manifest index.html logo-jPg scripts demo.js styles screen.css 93 Download from www.eBookTM.com Next add the following lines to demo.manifest CACHE MANIFEST index.html log .jPg scripts demo.js styles screen.css The paths in the manifest are relative to the location of the manifest file. You can also use absolute URLs like so don t bother creating this just yet you ll see how to apply this to your app shortly CACHE MANIFEST http www.exomple.com index.html http www.exomple.com .