HTML5 An Introduction

Size: px

Start display at page:

Download "HTML5 An Introduction"

Lily O’Brien’
5 years ago
Views:

1 HTML5 An Introduction Group 3: Nguyen Viet Thang Le Anh Hoang Nguyen Phuong Anh Phan Thi Thanh Ngoc Truong Van Thang Truong Quang Minh 1HTML5 - Introduction

2 Overview Introduction HTML5 Canvas HTML5 Audio and Video HTML5 Geolocation HTML5 Web storage HTML5 Websocket The future of HTML5 2HTML5 - Introduction

3 What is Html? HTML stands for Hypertext Markup Language 3HTML5 - Introduction

4 A short history of HTML 1991 HTML first mentioned Tim Berners-Lee HTML Tags 1993 HTML 1993 HTML 2 draft 1995 HTML 2 W3C 1995 HTML 3 draft 1997 HTML 3.2 Wilbur 1997 HTML 4 - Cougar - CSS 1999 HTML XHTML draft 2001 XHTML 4HTML5 - Introduction

5 A short history of AJAX 5 HTML5 - Introduction

6 A More Powerful Web 6 HTML5 - Introduction

7 Browser Support For HTML5 7 HTML5 - Introduction

8 What s New? Changes to old Tags: Doctype Pre-HTML5 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" " tml1-strict.dtd"> HTML5 <!DOCTYPE html> 8HTML5 - Introduction

9 Changes to old Tags: html Pre-HTML5 <html xmlns=" lang="en" xml:lang="en"> HTML5 <html lang="en" xml:lang="en"> 9HTML5 - Introduction

10 Changes to old Tags <link rel="stylesheet" href="styleoriginal.css" > <meta charset="utf-8"> Provide new tag <header> <hgroup> <nav> <article> <aside> <footer> 10

11 What is being not supported in HTML5? BASEFONT BIG CENTER FONT S STRIKE TT U FRAME FRAMESET NOFRAMES ACRONYM APPLET ISINDEX DIR Can be duplicated with the CSS element or iframe. 11

12 New important feature Canvas Audio and video Geolocation Web database (app cache & database) Web socket 12

13 CANVAS 13 HTML5 - Introduction

14 Until Recently, you couldn t draw on the web 14 HTML5 - Introduction

15 Javascript:onClick(Draw()); And graphics weren t very interactive 15

16 The usual options to solve the problem 16 HTML5 - Introduction

17 Overview of HTML5 Canvas What is a Canvas? graphics, charts, images, animation Introduced by Apple 17

18 Canvas Coordinates x and y coordinates on a canvas 18

19 Browser Support for HTML5 Canvas 19

20 Adding a Canvas to a Page <canvas id="diagonal" style="border: 1px solid;" width="200" height="200"> </canvas> A simple HTML5 canvas element on an HTML page 20

21 Translated diagonal line on a canvas <script> function drawdiagonal() { // Get the canvas element and its drawing context var canvas = document.getelementbyid('diagonal'); var context = canvas.getcontext('2d'); Diagonal line on a canvas // Create a path in absolute coordinates context.beginpath(); context.moveto(70, 140); context.lineto(140, 70); } // Stroke the line onto the canvas context.stroke(); window.addeventlistener("load", drawdiagonal, true); </script> 21

22 Working with Paths function createcanopypath(context) { // Draw the tree canopy context.beginpath(); context.moveto(-25, -50); context.lineto(-10, -80); context.lineto(-20, -80); context.lineto(-5, -110); context.lineto(-15, -110); // Top of the tree context.lineto(0, -140); context.lineto(15, -110); context.lineto(5, -110); context.lineto(20, -80); context.lineto(10, -80); context.lineto(25, -50); // Close the path back to its start point context.closepath(); } function drawtrails() { var canvas = document.getelementbyid('trails'); var context = canvas.getcontext('2d'); context.save(); context.translate(130, 250); // Create the shape for our canopy path createcanopypath(context); // Stroke the current path context.stroke(); context.restore(); } 22

23 Working with Paths A simple path of a tree canopy 23

24 Working with Stroke Styles // Increase the line width context.linewidth = 4; // Round the corners at path joints context.linejoin = 'round'; // Change the color to brown context.strokestyle = '#663300'; // Finally, stroke the canopy context.stroke(); Stylish stroked tree canopy 24

25 Working with Fill Styles // Set the fill color to green and fill the canopy context.fillstyle = '#339900'; context.fill(); Filled tree canopy 25

26 Other Canvas APIs Drawing Curves Inserting Images into a Canvas Using Gradients Using Background Patterns Scaling Canvas Objects Using Canvas Transforms Using Canvas Text Applying Shadows Working with Pixel Data Implementing Canvas Security 26

27 HTML5 Forms New input types, new functions and attributes 27

28 HTML5 Forms 28

29 New form attributes and functions The placeholder Attribute <label>runner: <input name="name" placeholder="first and last name" required></label> The autocomplete Attribute <input type="text" name="creditcard" autocomplete="off"> The autofocus Attribute <input type="search" name="criteria" autofocus> The list Attribute and the datalist Element 29

30 New form attributes and functions The list Attribute and the datalist Element <datalist id="contactlist"> <option label="racer X"> <option label="peter"> </datalist> <input type=" " id="contacts" list="contactlist"> 30

31 New form attributes and functions The min and max Attributes The step Attribute The valueasnumber Function The required Attribute Checking forms with validation Validation Fields and Functions Turning Off Validation Demo HTML Forms 31

32 Browser Support for HTML5 Form Browser Chrome Firefox Internet Explorer Opera Safari Details 5.0.x supports input types , number, tel, url, search, and range. Most validation. Not supported in 3.6. Initial support coming in 4.0.Unsupported input types such as url, , and range will fall back to a text field. Not supported, but new types will fall back to a text field rendering. Strong support for initial specifications in current versions, including validation. 4.0.x supports input types , number, tel, url, search, and range. Most validation. Some types supported better in mobile Safari. 32

33 Video and Audio 33 HTML5 - Introduction

34 Browser support for HTML5 Audio and Video 34

35 Using the HTML5 Audio and Video As a user: don't have to bother installing any plug-in As a developer: really easy 35

36 Using the HTML5 Audio <audio src="love TODAY.ogg" src="love TODAY.mp3" controls="controls"> </audio> 36

37 Element attributes 37

38 Audio Format 38

39 VIDEO <html> <video id="clip1" controls="controls"> <source src="clip1.webm" /> </video> </html> 39

40 Element attributes 40

41 Video Format 41

42 Geolocation 42 HTML5 - Introduction

43 What is this? Geolocation provides location information for the device, such as latitude and longitude. Common sources of location information include Global Positioning System (GPS) and location inferred from network signals such as IP address, RFID, WiFi and Bluetooth MAC addresses, and GSM/CDMA cell IDs. No guarantee is given that the API returns the device's actual location. The World Wide Web Consortium (W3C) have published a Geolocation API specification in HTML5 that allows a web page to query the user's location using JavaScript to access objects exposed by the browser. Methods geolocation.getcurrentposition geolocation.watchposition geolocation.clearwatch... 43

44 GSM/CDMA cell IDs Wifi or ip address GPS 44

45 Demo var map = null; var geocoder = null; function initialize() { if (GBrowserIsCompatible()) { //check Browser is compatible? map = new GMap2(document.getElementById("map_canvas")); //Draw map map.setcenter(new GLatLng( , ), 13); //Set center of map geocoder = new GClientGeocoder(); //access the Google Maps API geocoding service via the GClientGeocoder object } } function showaddress(address) { if (geocoder) { //Use GClientGeocoder.getLatLng() to convert a string address into a GLatLng. This method takes as parameters a string address to convert, and a callback function to execute upon retrieval of the address. geocoder.getlatlng( address, function(point) { //we geocode an address, add a marker at that point, and open an info window displaying the address. if (!point) { alert(address + " not found"); } else { map.setcenter(point, 13); var marker = new GMarker(point); map.addoverlay(marker); marker.openinfowindowhtml(address); } } ); } } 45

46 App cache & database 46 HTML5 - Introduction

47 Storing Data on the Client HTML5 offers two new objects for storing data on the client: localstorage - stores data with no time limit sessionstorage - stores data for one session HTML5 uses JavaScript to store and access the data 47

48 The localstorage Object The localstorage object stores the data with no time limit The data will be available the next day, week, or year. How to create and access a localstorage? <script type="text/javascript"> localstorage.lastname="smith"; document.write(localstorage.lastname); </script> Your result: Last name: Smith Demo: webstorage_local 48

49 The localstorage Object The following example counts the number of times a user has visited a page: <script type="text/javascript"> if (localstorage.pagecount) { localstorage.pagecount=number(localstorage.pagecount) +1; } else { localstorage.pagecount=1; } document.write("visits "+ localstorage.pagecount + " time(s)."); </script> Your result: Visits: 4 time(s). Refresh the page to see the counter increase.close the browser window, and try again, and the counter will continue. Demo: age_local_pagecount 49

50 The sessionstorage Object The sessionstorage object stores the data for one session. The data is deleted when the user closes the browser window. How to create and access a sessionstorage: <script type="text/javascript"> sessionstorage.lastname="smith"; document.write(sessionstorage.lastname); </script> Your result: Smith Demo: webstorage_session 50

51 The sessionstorage Object The following example counts the number of times a user has visited a page, in the current session: <script type="text/javascript"> if (sessionstorage.pagecount){ sessionstorage.pagecount=number(sessionstorage.pagecount) +1; } else{ sessionstorage.pagecount=1; } document.write("visits "+sessionstorage.pagecount+" time(s) this session."); </script> Your result: Visits 1 time(s) this session. Refresh the page to see the counter increase. Close the browser window, and try again, and the counter has been reset. Demo: storage_session_pagecount 51

52 Web socket 52 HTML5 - Introduction

53 WebSocket Attributes 53

54 WebSocket Events 54

55 WebSocket Methods 55

56 WebSocket Example Demo Creating Client Side HTML & JavaScript Code File 56

57 WebSocket Example Demo Install pywebsocket 1. Unzip and untar the downloaded file. 2. Go inside pywebsocket-x.x.x/src/ directory. 3. $python setup.py build => python compiler 4. $sudo python setup.py install 5. Then read document by: $pydoc mod_pywebsocket This will install it into your python environment 57

58 WebSocket Example Demo Start the Server Go to the pywebsocket-x.x.x/src/mod_pywebsocket folder and run the following command This will install it into your python environment 58

59 WebSocket Example Demo Go to the pywebsocket-x.x.x/src/mod_pywebsocket folder and run the following command This will install it into your python environment This will start the server listening at port 9998 and use the handlers directory specified by the -w option where our echo_wsh.py resides. 59

60 What s else? Web workers Offline web applications Cross-document messaging Drag and Drop Server sent DOM events Inline SVG 60

61 Future of HTML5 HTML5 provides powerful programming features HTML in Three Dimensions 3D Shaders Devices Peer to peer networking 61

62 Reference Peter Lubbers, Brian Albers, and Frank Salim, Programming Powerful APIs for Richer Internet Application Development Mathew David, HTML5 Designing Rich Internet Application Information that search from Google website. 62

63 ANY QUESTION OR COMMENT? Nguyen Viet Thang Le Anh Hoang Phan Thi Thanh Ngoc Nguyen Phuong Anh Truong Van Thang Truong Quang Minh 63

64 What is required to support HTML5 from the client-side? And from the server-side? Client-side: Browser support HTML5 (Such as: Safari 5.0, Google Chrome, Firefox 3.5 or over, Internet Explorer 9.0) Server-side: HTML5 also applies the Comet communication pattern by defining Server-Sent Events (SSE). So the server must support the comet long-term connection to user the HTML5 Web Socket API Server must support to response HTML in HTML5 format. 64

65 Explain in two or three sentences the benefits of the canvas environment. The HTML 5 canvas environment gives a standard way of handling drawing and animation in the web browser without using to a third-party plug-in. Plus, the canvas tag is a part of the document, so the browser can easily integrate it into the content. The canvas environment provides developers with a simple way to using JavaScript to draw diagrams, graphics and animations on a web page. With canvas, you can blur, burn, and dodge your images easily. 65

66 What are the main improvements of HTML5? In my opinion, HTML5 has added five important feature Web workers: This feature allows developer to separate background threads used to do processing without effecting performance of a webpage, it can be very useful for web applications which relies on heavy scripts to perform functions. Audio & Video element: Developer can embed video code with the same amount of ease as they now embed an image with the ability to manipulate audio, videos and built-in video controls among other things. Canvas: Let user render graphics and images on the webpage. Application caches: It is the ability to store web apps like locally and access it without having to connect to the internet or install an external client like Outlook or Thunderbird. Geolocation: This API defines location information with high-level interface (GPS) associated with the device hosting the API. Developer can build a lot of feature with this API such as: identify the location of the user and finding the shortest way to the destination, etc. 66

67 Explain with more details why the Web Socket example is related to HTML5 Normally when a browser visits a web page, an HTTP request is sent to the web server that hosts that page. The webserver receive this request and sends back response. The problem is the response could be stale by the time the browser renders the page with some cases such as for stock prices, news reports and so on. In HTML5, the Web Sockets is added to solve this problem. Web Sockets API support a full-duplex communication channel that works over a single socket and it is exposed through a JavaScript interface in HTML 5 compliant browsers. This API support streaming over HTTP, Comet requires a long-lived connection allow developer to develop many real-time web application easier. 67

68 Html5 WebSocket Thi Thanh Ngoc PHAN

69 HTML5 WebSocket Introduction Web Sockets is a next-generation bidirectional communication technology for web applications It is a standard bidirectional TCP socket between the client and the server. The socket starts out as a HTTP connection and then "Upgrades" to a TCP socket after a HTTP handshake. After the handshake, either side can send data

70 HTML5 WebSocket Attributes Attribute Socket.readyState Description Represents the state of the connection with following values: = 0 : indicates that the connection has not yet been established. = 1 : indicates that the connection is established and communication is possible. = 2 : indicates that the connection is going through the closing handshake. = 3 : indicates that the connection has been closed or could not be opened. Socket.bufferedAmount Represents the number of bytes of UTF-8 text that have been queued using send() method.

71 HTML5 WebSocket Events Event Event Handler Description open Socket.onopen This event occurs when socket connection is established. message Socket.onmessage This event occurs when client receives data from server. error Socket.onerror This event occurs when there is any error in communication. close Socket.onclose This event occurs when connection is closed. HTML5 WebSocket Methods: Method Socket.send() Socket.close() Description The send(data) method transmits data using the connection. The close() method would be used to terminate any existing connection.

72 WebSocket Example Demo Following 3 steps: I. Creating Client Side: HTML & JavaScript Code in HTLM 5 compliant browers II. III. Install pywebsocket: using mod_pywebsocket Start the Server Start the server listening at a port, using pywebsocket Handle

73 WebSocket Example Demo I. Creating Client Side HTML & JavaScript Code <html><head><script type="text/javascript"> function WebSocketTest(){ if ("WebSocket" in window) { alert("websocket is supported by your Browser!"); var ws = new WebSocket("ws://localhost:9998/echo"); // Open a web socket // Web Socket is connected, send data using send() ws.onopen = function() { ws.send("message to send"); alert("message is sent..."); }; ws.onmessage = function (evt) { var received_msg = evt.data; alert("message is received..."); }; ws.onclose = function() { // websocket is closed. alert("connection is closed..."); }; } else { // The browser doesn't support WebSocket alert("websocket NOT supported by your Browser!"); }} </script></head> <body> <div id="sse"><a href="javascript:websockettest()">run WebSocket</a></div> </body> </html>

74 WebSocket Example Demo II. Install pywebsocket: 1. Unzip and untar the downloaded file. 2. Go inside pywebsocket-x.x.x/src/ directory. 3. $python setup.py build => python compiler 4. $sudo python setup.py install 5. Then read document by: $pydoc mod_pywebsocket This will install it into your python environment

75 WebSocket Example Demo III. Start the Server Go to the pywebsocket-x.x.x/src/mod_pywebsocket folder and run the following command $sudo python standalone.py -p w../example/ This will start the server listening at port 9998 The socket starts out as a HTTP connections and Upgrades to a TCP socket after a HTTP handshake. After handshake, either side can send data

Index LICENSED PRODUCT NOT FOR RESALE

Index LICENSED PRODUCT NOT FOR RESALE A Absolute positioning, 100 102 with multi-columns, 101 Accelerometer, 263 Access data, 225 227 Adding elements, 209 211 to display, 210 Animated boxes creation using