html5 apis - where no man has gone before! - altran
DESCRIPTION
TRANSCRIPT
HTML5 APIs - Where No Man Has
Gone Before!
classList
var elm = document.getElementById("classlist-demo");elm.classList.add("boxy");elm.classList.add("pretty");elm.classList.remove("pretty");elm.classList.toggle("pretty");elm.classList.contains("pretty");elm.classList.toString();
Web Storage
sessionStorage.setItem("FU", "Sarah Palin");console.log(sessionStorage.getItem("FU"));
localStorage.setItem("Job", "Politician");
var sarahPalin = { "contest" : "Miss Alaska pageant", "Talent" : "Flute playing"};
localStorage.setItem("sarah", JSON.stringify(sarahPalin));
console.log(typeof JSON.parse(localStorage.getItem("sarah")));
IndexedDBWeb SQL
IndexedDB
// IndexedDBvar indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.OIndexedDB || window.msIndexedDB, IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.OIDBTransaction || window.msIDBTransaction, dbVersion = 1;
// Create/open databasevar request = indexedDB.open("elephantFiles", dbVersion);
createObjectStore = function (dataBase) { // Create an objectStore dataBase.createObjectStore("elephants");}
// Currently only in latest Firefox versionsrequest.onupgradeneeded = function (event) { createObjectStore(event.target.result);};
request.onsuccess = function (event) { // Create XHR var xhr = new XMLHttpRequest(), blob;
xhr.open("GET", "elephant.png", true);
// Set the responseType to blob xhr.responseType = "blob";
xhr.addEventListener("load", function () { if (xhr.status === 200) { // Blob as response blob = xhr.response;
// Put the received blob into IndexedDB putElephantInDb(blob); } }, false); // Send XHR xhr.send();}
putElephantInDb = function (blob) { // Open a transaction to the database var transaction = db.transaction(["elephants"], IDBTransaction.READ_WRITE);
// Put the blob into the dabase var put = transaction.objectStore("elephants").put(blob, "image");
// Retrieve the file that was just stored transaction.objectStore("elephants").get("image").onsuccess = function (event) { var imgFile = event.target.result;
// Get window.URL object var URL = window.URL || window.webkitURL;
// Create and revoke ObjectURL var imgURL = URL.createObjectURL(imgFile);
// Set img src to ObjectURL var imgElephant = document.getElementById("elephant"); imgElephant.setAttribute("src", imgURL);
// Revoking ObjectURL URL.revokeObjectURL(imgURL); };};
Offline Web Applications
if (window.addEventListener) { /* Works well in Firefox and Opera with the Work Offline option in the File menu. Pulling the ethernet cable doesn't seem to trigger it */ window.addEventListener("online", isOnline, false); window.addEventListener("offline", isOffline, false);}else { /* Works in IE with the Work Offline option in the File menu and pulling the ethernet cable */ document.body.ononline = isOnline; document.body.onoffline = isOffline;}
// Poll the navigator.onLine propertysetInterval(function () { console.log(navigator.onLine);}, 1000);
<!DOCTYPE html><html manifest="offline.appcache"><head>...
CACHE MANIFEST
# VERSION 10
CACHE:offline.htmlbase.css
FALLBACK:online.css offline.css
NETWORK:/live-updates
History API
window.history.pushState(state, title, url);
var url = "http://robertnyman.com",title = "My blog",state = { address : url};
window.history.pushState(state, title, url);
Web Sockets
What came before WebSockets?
Cross Frame Communication
HTTP Polling
LiveConnectForever Frame
AJAX
HTTP Long-Polling and XHR Streaming
var ws = new WebSocket("ws://robertnyman.com/wsmagic");
// Send dataws.send("Some data");
// Close the connectionws.close();
var ws = new WebSocket("ws://robertnyman.com/wsmagic");
// When connection is openedws.onopen = function () { console.log("Connection opened!");};
// When you receive a messagews.onmessage = function (evt) { console.log(evt.data);};
// When you close the connectionws.onclose = function () { console.log("Connection closed");};
// When an error occurred ws.onerror = function () { console.log("An error occurred");};
web-socket-jsSocket.IO
File API
<!-- The multiple attribute allows for uploading of multiple files--><input id="files-upload" type="file" multiple>
var filesUpload = document.getElementById("files-upload");filesUpload.onchange = function () { // Access to data about all files var files = this.files, file; for (var i=0, l=files.length; i<l; i++) { file = file[i]; file.name; // Get the name of the file file.size; // Get the size of the file, in bytes file.type; // Get the type of the file };};
for (var i=0, l=files.length, file, img; i<l; i++) { file = files[i]; if (typeof FileReader !== "undefined") { img = document.createElement("img"); reader = new FileReader(); reader.onload = (function (theImg) { return function (evt) { theImg.src = evt.target.result; }; }(img)); reader.readAsDataURL(file); }}
// For Firefox, Google Chrome and Safarivar xhr = new XMLHttpRequest();xhr.open("post", "upload/upload.php", true);xhr.onreadystatechange = function() { if (this.readyState === 4) { // File uploaded }};
// Upload file: Firefox, Google Chrome and Safarixhr.setRequestHeader("Content-Type", "multipart/form-data");xhr.setRequestHeader("X-File-Name", file.fileName);xhr.setRequestHeader("X-File-Size", file.fileSize);xhr.setRequestHeader("X-File-Type", file.type);
xhr.send(file);
Drag and Drop
...I am forced to conclude that the HTML5 drag and drop module is not just a disaster, it’s a fucking disaster.
-Peter-Paul Koch
<div id="can-be-dragged" draggable></div>
<p id="drop-area"> Drag and drop files here</p>
var someImg = document.getElementById("some-image"), dropArea = document.getElementById("drop-area"); someImg.ondragstart = function (evt) { var event = evt || window.event; event.dataTransfer.setData("Text", this.getAttribute("alt")); return false;};
dropArea.ondragenter = function (evt) { return false;};
dropArea.ondragover = function (evt) { return false;};
dropArea.ondrop = function (evt) { var text = event.dataTransfer.getData("Text"); event.cancelBubble = true; // For IE return false;};
“If the drop is to be accepted, then this
event (dragover) has to be canceled.”
someImg.ondragstart = function (evt) { var event = evt || window.event; event.dataTransfer.setDragImage(dragIcon, -10, -10); return false;};
Web Workers
var worker = new Worker("worker.js");
// Main page code var worker = new Worker("worker.js"); // postMessage worker.postMessage(5);
// Receive message back from Worker worker.onmessage = function (evt) { document.getElementById("worker-results").innerHTML = evt.data; };
// Error handling worker.onerror = function (evt) { document.getElementById("worker-results").innerHTML = "An error occurred"; };
// Web Worker code onmessage = function (evt) { for (var i=evt.data, il=1000001; i<il; i++) { postMessage(i); }; };
Fullscreen
<button id="view-fullscreen">Fullscreen</button>
<script type="text/javascript">(function () { var viewFullScreen = document.getElementById("view-fullscreen"); if (viewFullScreen) { viewFullScreen.addEventListener("click", function () { var docElm = document.documentElement; if (docElm.mozRequestFullScreen) { docElm.mozRequestFullScreen(); } else if (docElm.webkitRequestFullScreen) { docElm.webkitRequestFullScreen(); } }, false); }})(); </script>
mozRequestFullScreenWithKeys?
html:-moz-full-screen { background: red;}
html:-webkit-full-screen { background: red;}
<input type="file" id="take-picture" accept="image/*">
takePicture.onchange = function (event) { // Get a reference to the taken picture or chosen file var files = event.target.files, file; if (files && files.length > 0) { file = files[0]; // Get window.URL object var URL = window.URL || window.webkitURL;
// Create ObjectURL var imgURL = URL.createObjectURL(file);
// Set img src to ObjectURL showPicture.src = imgURL;
// Revoke ObjectURL URL.revokeObjectURL(imgURL); }};
WebRTC
var liveVideo = document.querySelector("#live-video");navigator.getUserMedia( {video: true}, function (stream) { liveVideo.src = stream; }, function (error) { console.log("An error occurred: " + error); });
Pointer Lock API
var docElm = document.documentElement; // Requesting Pointer LockdocElm.requestPointerLock = elem.requestPointerLock || elem.mozRequestPointerLock || elem.webkitRequestPointerLock; docElm.requestPointerLock();
document.addEventListener("mousemove", function(e) { var movementX = e.movementX || e.mozMovementX || e.webkitMovementX || 0, movementY = e.movementY || e.mozMovementY || e.webkitMovementY || 0;
// Print the mouse movement delta values console.log("movementX=" + movementX, "movementY=" + movementY); }, false);
Battery
// Get battery level in percentagevar batteryLevel = battery.level * 100 + "%";
// Get whether device is charging or notvar chargingStatus = battery.charging;
// Time until the device is fully chargedvar batteryCharged = battery.chargingTime;
// Time until the device is dischargedvar batteryDischarged = battery.dischargingTime;
battery.addEventLister("levelchange", function () { // Device's battery level changed}, false);
battery.addEventListener("chargingchange", function () { // Device got plugged in to power, or unplugged}, false);
battery.addEventListener("chargingtimechange", function () { // Device's charging time changed}, false);
battery.addEventListener("dischargingtimechange", function () { // Device's discharging time changed}, false);
Try new things
"So we saved the world together for a while, and that was lovely."
-Lost
Robert [email protected]: @robertnyman
robertnyman.com/speaking/robertnyman.com/html5/robertnyman.com/css3/