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Javascript Articles
Page 530 of 534
HTML5 and Amazon S3 Multi-Part uploads
Yes, it is possible to use the HTML 5 File API with the Amazon S3 multi-part upload feature. You would need a server backup as well as Amazon API keys.Amazon S3, a web service offered by Amazon Web Services provides storage through web services interfaces. Amazon launched S3 in 2007.Create multipart upload with Amazon API and send "key"(filename) and "upload id" back to the web page. For the multi-part, you need to send part data directly to Amazon S3 via the "part upload URL" using "date" and "auth header".
Read MoreWebsocket for binary transfer of data & decode with HTML5
Use base64 encode/ decode on client and server. All the web browsers with WebSockets have window.atob (base64 decode) and window.btoa (base64 encode). The WebSockets server has base64 libraries.To transfer binary data, you would be working with wsproxy included with no VNC that is a web based VNC client.The wsproxy is a WebSockets to generic TCP sockets proxy. The base64 encodes/decodes all traffic to/from the browser. Use it to connect from a WebSockets capable browser to any type of TCP port.
Read MoreHTML5 <audio> tag on Android for PhoneGap application
PhoneGap is a software development framework by Adobe System, which is used to develop mobile applications. PhoneGap produces apps for all popular mobile OS platforms such as iOS, Android, BlackBerry, and Windows Mobile OS etc.HTML5 Audio support is not consistent across different devices due to codec licensing issues and OS implementation. Forplaying MP3 file, handle by using PhoneGap's Media class that would provide reliable audio programming on all the platforms.To repload audio and polyphony or layering, you can use the LowLatencyAudio PhoneGap native plugin.
Read MoreDifference between MessageChannel and WebSockets in HTML5
Web Sockets is a next-generation bidirectional communication technology for web applications that operates over a single socket and is exposed via a JavaScript interface in HTML 5 compliant browsers. Once you get a Web Socket connection with the web server, you can send data from browser to server by calling a send() method, and receive data from server to browser by an onmessage event handler.Two way communication between the browsing contexts is called channel messaging. It is useful for communication across multiple origins.While creating messageChannel, it internally creates two ports to sending the data and forwarded to another browsing context. ...
Read MoreCan Google Analytics track interactions in an offline HTML5 app?
Google Analytics is a freemium analytic tool that provides a detailed statistics of the web traffic. It is used by more than 60% of website owners. Analytics Tools offer an insight into the performance of your website, visitors’ behavior, and data flow. These tools are inexpensive and easy to use. Sometimes, they are even free.If the application is offline, Google Analytics stores the events in an SQLite database.After storing, it waits until the user is online again to send them.It is used to collect offline latent hits. The value represents the time delta in milliseconds between when the hit occurs ...
Read MoreUsing client side XSLT transformations in HTML5
Client-side XSLTProcessor API is part of the HTML5 scripting specification, as stated below:When an XSLT transformation program is triggered by a processing instruction and the browser implements a direct-to-DOM transformation, script elements created by the XSLT processor need to be marked "parser-inserted" and run in document oThe XSLTProcessor.transformToDocument() method adds elements to a Document that does not have a browsing context, and, accordingly, any script elements they create need to have their "already started" flag set in the prepare a script algorithm and never get executed (scripting is disabled). Such script elements still need to be marked "parser-inserted", though, such ...
Read MoreHTML5 applicationCache vs Browser Cache
HTML5 applicationCacheIt can be understood by an example that a web application is cached, and accessible without a connected internet. Application cache has some advantages: users can use the application when they're offline, cached resources load faster and reduced server load. Browser cache Web browsers use caching to store HTML web pages by storing a copy of visited pages. After that, the copy is used to render when you visit that page again
Read MoreGet maximal GPS precision on mobile browser
Built-in browser for Android will not give you accurate GPS location for security reasons. Test it with different web browsers that would need permissions to get the accurate location from GPS when installed.After switching GPS off, the data is received with < 10 meters accuracy.Do not use Android Browser for websites, if you want to get GPS location with high accuracy.50 meters precision can be seen for Safari browser if tested for iPhone with wifi switched off. Yes, the accuracy is lesser.
Read MoreTo “user-scalable=no” or not to “user-scalable=no” in HTML5
For responsive design, you do not have to use user-scalable=no. Use it only if you want your application to look more like a native app.Zooming is a key feature for accessibility and you need to keep that in mind. You can control that users won't break your design if they zoom in. If you are doing responsive and your design breaks when zooming in, then you're not doing it right.If you totally need to use it, then keep in mind that zooming is an important accessibility feature that is used by many people.
Read MoreDifference between Session Storage and Local Storage in HTML5
Session StorageThe Session Storage is designed for scenarios where the user is carrying out a single transaction but could be carrying out multiple transactions in different windows at the same time.Local StorageThe Local Storage is designed for storage that spans multiple windows and lasts beyond the current session. In particular, Web applications may wish to store megabytes of user data, such as entire user-authored documents or a user's mailbox, on the client side for performance reasons.HTML5 introduces the localStorage attribute which would be used to access a page's local storage area without no time limit and this local storage will ...
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