Learn HTML5 and JavaScript for Android

By Gavin Williams

Learn HTML5 and JavaScript for Android teaches the basic HTML5 and JavaScript talents you want to make nice apps for the Android platform and browser.

This booklet courses you thru the construction of a cellular internet app. you will placed the HTML5, CSS3 and JavaScript abilities you study into perform, providing you with worthwhile first-hand event that may serve you good as you cross directly to strengthen your personal net apps for Android smartphones and tablets.

all through this publication, you'll study new abilities and produce those altogether to create an online app that runs at the Android platform in addition to different cellular platforms.

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To make a request, it’s so simple as calling. var request = new app. software. jsonp(“http://myservice. com/staff/101/”, “showProfile”); request. send(); the matter with JSONP is that in contrast to Ajax, you can’t cancel a request. So while you are sending requests often for an autocomplete box, you could locate that a number of requests are despatched, yet they don't come again within the order that you simply count on. how one can deal with this can be lined within the videos Controller additional into this bankruptcy. Controlling the structure and dealing with Resizes occasionally, it's possible you'll discover a situation the place utilizing CSS by myself can’t produce the format that you really want. for example, you've gotten 3 parts on a web page that experience unpredictable heights. utilizing JavaScript to address this could fairly be visible as a final hotel, as there is a hold up among whilst your web page rather a lot and whilst the format software adjusts the size of the weather. The code for this application appears to be like a little varied than the opposite items. It makes use of a self-executing functionality in order that once the script finishes loading, it instantly executes. Create a brand new dossier inside of js/app/utility/ known as structure. js that includes the next code. var app = app || {}; app. application = app. software || {}; app. software. format = (function(){ /** * this system will alter the peak of all decks * in order that there's house on the most sensible for the taskbar, * which has an unpredictable peak */ var fixdeckheight = function(){ /** * First loop via every one deck */ []. forEach. call(document. getElementsByClassName('deck'), function(el){ /** * And set the peak of the deck by way of subtracting the peak of * the taskbar from the peak of the rfile physique */ el. variety. peak = (document. physique. offsetHeight – record. getElementById('taskbar'). offsetHeight) + 'px'; }); }; /** * Create a timeout variable, because it could take some time * for the hot sizes to replace in a few browsers */ var timeout; /** * upload an occasion listener to the window in order that while * it truly is resized, it's going to transparent the timeout */ window. addEventListener('resize', function(){ // transparent the timeout simply in case it is set, to prevents a number of calls clearTimeout(timeout); /* * Set the timeout to 100ms and execute fixdeckheight on the finish of * the timeout */ timeout = setTimeout(function(){ fixdeckheight(); }, 100); }); // name fixdeckheight for the 1st time fixdeckheight(); })(); As you will find from the code reviews, the self-executing functionality features a strategy known as fixdeckheight. This easily units the peak of the deck to be the dimensions of the viewport, taking into consideration the scale of the taskbar. the development listener will pay attention for the resize occasion to fireside and contact the fixdeckheight functionality. A timer is used, because the viewport measurement isn’t instantly to be had whilst the resize occasion is fired. The View while I first encountered perspectives in MVC for JavaScript, i thought that the view used to be easily a bit of HTML outlined on an HTML website, similar to MVC in Hypertext Preprocessor. My principles on perspectives have due to the fact advanced.

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