HTML5 APIs - Where No Man Has Gone Before! - GothamJS
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The document discusses various HTML5 APIs and their capabilities including web storage, geolocation, canvas, video, and web sockets. It provides code examples for how to use sessionStorage, localStorage, get geolocation data, draw on canvases, and open web sockets. The document is an introduction to exploring HTML5 capabilities on mobile and how no area has been untouched by new possibilities through these emerging APIs.
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HTML5 APIs - Where No Man Has Gone Before! - GothamJS
- 1. HTML5 APIs CSS3: Exploring HTML5 and - Where No Man Mobile Possibilities Has Gone Before!
- 7. Web Storage
- 11. var anthonyWeiner = { "Interest" : "Photography", "Social" : "Twitter" }; localStorage.setItem("anthonyWeiner", JSON.stringify(anthonyWeiner)); console.log(typeof JSON.parse(localStorage.getItem("anthonyWeiner")));
- 12. Web SQL IndexedDB
- 14. 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; }
- 15. // Poll the navigator.onLine property setInterval(function () { console.log(navigator.onLine); }, 1000);
- 17. CACHE MANIFEST # VERSION 10 CACHE: offline.html base.css FALLBACK: online.css offline.css NETWORK: /live-updates
- 18. Geolocation
- 19. if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(function (position) { alert(position.coords.latitude + ", " + position.coords.longitude); }); }
- 22. History API
- 23. var url = "http://robertnyman.com", title = "My blog", state = { address : url }; window.history.pushState(state, title, url);
- 25. Web Sockets
- 27. var ws = new WebSocket("ws://robertnyman.com/wsmagic"); // Send data ws.send("Some data"); // Close the connection ws.close();
- 28. var ws = new WebSocket("ws://robertnyman.com/wsmagic"); // When connection is opened ws.onopen = function () { console.log("Connection opened!"); }; // When you receive a message ws.onmessage = function (evt) { console.log(evt.data); }; // When you close the connection ws.onclose = function () { console.log("Connection closed"); }; // When an error occurred ws.onerror = function () { console.log("An error occurred"); };
- 31. File API
- 32. <!-- The multiple attribute allows for uploading of multiple files --> <input id="files-upload" type="file" multiple>
- 33. 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 }; };
- 34. 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); } }
- 35. // For Firefox, Google Chrome and Safari var 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 Safari xhr.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);
- 37. Video
- 39. <video controls> <source src="nasa.mp4"></source> <source src="nasa.webm"></source> <p>Hello, older web browser</p> </video>
- 48. Canvas
- 49. Apple even creates open standards for the web -Steve Jobs
- 50. <canvas id="my-canvas" width="500" height="500"> I am canvas </canvas>
- 51. var canvas = document.getElementById("my-canvas"), context = canvas.getContext("2d"); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100);
- 52. context.save(); context.fillStyle = "rgba(0, 0, 200, 0.5)"; context.fillRect(50, 50, 100, 100); context.clearRect(40, 40, 20, 20); context.restore();
- 54. context.fillRect(350, 50, 100, 100); context.lineWidth = "10"; context.lineJoin = "round"; context.moveTo(50, 50); context.lineTo(200, 200); context.lineTo(100, 300); context.closePath(); context.stroke(); context.fill(); context.beginPath(); context.strokeStyle = "#00f"; context.arc(200, 400, 75, 0, Math.PI*2, false); context.stroke();
- 57. context.fillStyle = "#fff"; context.fillRect(0, 0, 200, 200); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.fillRect(100, 100, 100, 100);
- 59. context.strokeStyle = "transparent"; context.arc(100, 100, 75, 0, Math.PI*2, false); context.clip(); context.stroke(); context.fillStyle = "#fff"; context.fillRect(0, 0, 200, 200); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.fillRect(100, 100, 100, 100);
- 61. var canvas = document.getElementById("my-canvas"), context = canvas.getContext("2d"), img = document.createElement("img"); img.addEventListener("load", function () { context.drawImage(img, 0, 0, 600, 200); // Get canvas content as a base64 image var base64Img = canvas.toDataURL("image/png"); }, false); img.setAttribute("src", "view.jpg");
- 63. WebGL
- 70. Robert Nyman robertnyman.com/speaking/ robnyman@mozilla.com robertnyman.com/html5/ Twitter: @robertnyman robertnyman.com/css3/