Chapter 2: Interactive Web Applications
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1 Chapter 2: Interactive Web Applications 2.1! Interactivity and Multimedia in the WWW architecture 2.2! Server-Side Scripting (Example PHP, Part I) 2.3! Interactivity and Multimedia for Web Browsers 2.4! Interactive Server-Side Scripting (Example PHP, Part II) 2.5! Interactive Client-Side Scripting! (Example HTML5/JavaScript) 2.6! Data Storage in Web Applications! (Example HTML5 & Database Access in PHP) 2.7! Asynchronous Interactivity in the Web (Example AJAX) Literature:! B. Lawson, R. Sharp: Introducing HTML5, New Riders 2011! S. Fulton, J. Fulton: HTML5 Canvas, O Reilly
2 Form Validation, Traditional Style Data entered into input forms needs to adhere to specific constraints: Some fields required, some optional Special formats like date, URL, address Checking the constraints ( validating the input) Performed by client-side script code (JavaScript) Typically an event handler for the onsubmit event Only if validation returns true, data is submitted Client-side validation saves server time and network traffic Nevertheless, server usually validates received data again! 2
3 Example: Traditional Form Validation <script type="text/javascript"> function validateform() { if (document.blogentry.name.value =="") { alert("name is required"); return false; } var input=document.blogentry. .value; var atpos= input.indexof("@"); var dotpos= input.lastindexof("."); if (atpos<1 dotpos<atpos+2 dotpos+2>= input.length) { alert("not a valid address"); return false; } return true; } </script> <form name="blog-entry" onsubmit="return validateform();"> <label for="name">name: </label> <input name="name" id="name" type="text"></br> <label for=" "> </label> <input name=" " id=" " type="text"> <input type="submit" value="submit"> formvalidate.html </form> validation code taken from w3schools.org 3
4 Form Validation with HTML5 Standard scenarios of form validation are integrated into HTML5 standard Input types: , URL, date, time, number, range, search, phone number, color Attributes: Required, min, max, step, pattern Frequent phenomenon: Procedural features are transformed to declarative features Using HTML5, JavaScript code can be removed Just using declarative HTML New code is less error-prone New code is more precise (regarding definition of input syntax) New code automatically benefits from upgrades Special devices (e.g. smartphones) can choose best representation Transition problem: For legacy browsers, traditional code has to remain for some time 4
5 Example: Form Validation with HTML5 <!DOCTYPE html> <html> <head> <title>form Validation HTML5</title> </head> <body> <form name="blogentry"> <label for="name">name: </label> <input id="name" type="text" required></br> <label for=" "> </label> <input id=" " type=" " required> <input type="submit" value="submit"> </form> </body> </html> formvalidate5.html Google Chrome 5
6 HTML5 Interactive Controls Standard controls for interactive applications have been integrated into HTML5 range element (slider control) color element (interactive color picker) Potential: Higher client-side (stand-alone) interactivity Typical applications: Drawing, image editing See discussion of canvas element below 6
7 Example: Slider in HTML5 <!DOCTYPE html> <html> <head> <style type="text/css"> </style> </head> slider.html <body onload="min.value=slider.min; max.value=slider.max; current.value=slider.value;"> <output id="min"></output> <input id="slider" type="range" min="100" max="600" step="10" onchange="current.value = slider.value"/> <output id="max"></output><br/> Current value: <output id="current"></output> </body> </html> 7
8 HTML5 Canvas HTML5 Canvas is an immediate mode bitmapped area of the screen that can be manipulated with JavaScript. (Fulton/Fulton) 2D Drawing Context: Object associated with a Canvas object Used as handler in JavaScript to address the canvas (drawing API) Typical drawing primitives: Draw shapes Render text Display images Apply colors, rotations, transparency, pixel manipulations, fills, strokes Canvas works on (low) pixel level Browser redraws whole canvas each time the Canvas is modified using JavaScript 8
9 Canvas Demo: Liquid Particles 9
10 Example: Drawing on the Canvas <!doctype html> <html> <head> <title>canvas Hello World</title> <script type="text/javascript"> window.addeventlistener("load", drawscreen, false); function drawscreen() { var c = document.getelementbyid("thecanvas"); var ctx = c.getcontext("2d"); ctx.fillstyle = "lightgrey"; ctx.fillrect(0, 0, c.width, c.height); ctx.font = "italic bold 32px sans-serif"; ctx.fillstyle = "red"; ctx.filltext("hello World!", 50, 50); } </script> </head> <body> <canvas id="thecanvas" width=300 height=80> Your browser does not support Canvas! </canvas> </body> </html> canvashello.html 10
11 Example: Interactive Gradient (1) <!doctype html> <html> <head> <title>canvas Gradient Fill</title> <meta charset="utf-8"> <script type="text/javascript"> window.addeventlistener("mousemove", drawscreen, false); function drawscreen(event) { var c = document.getelementbyid("thecanvas"); var ctx = c.getcontext("2d"); var mx = Math.min(event.clientX,c.width); var my = Math.min(event.clientY,c.height); var grad = ctx.createradialgradient(mx, my, 0, mx, my, c.width*1.5); grad.addcolorstop(0,"#f00"); grad.addcolorstop(1,"#00f"); ctx.fillstyle = grad; ctx.fillrect(0, 0, c.width, c.height); } </script> </head> gradient.html 11
12 Example: Interactive Gradient (2)... <body> <canvas id="thecanvas" width=500 height=500> Your browser does not support Canvas! </canvas> </body> </html> 12
13 Interactive Animations with HTML5 / JavaScript Example GeoBlaster ( Asteroid -like game by Fulton/Fulton) 13
14 Example Excerpt: Animation Principles (1) Timer-based loop:! const FRAME_RATE=40; frameratecounter=new FrameRateCounter(FRAME_RATE); var intervaltime=1000/frame_rate; setinterval(rungame, intervaltime ); rungame function is called again and again in fixed frequency For each frame (when in a play level game state) rungame calls:! function gamestateplaylevel(){ checkkeys(); update(); render(); checkcollisions(); checkforextraship(); checkforendoflevel(); frameratecounter.countframes(); } 14
15 Example Excerpt: Animation Principles (2) For each frame, all objects are updated: function update() { updateplayer(); updateplayermissiles(); updaterocks(); updatesaucers(); updatesaucermissiles(); updateparticles(); } Example: Update of player s ship:! function updateplayer() { player.missileframecount++; player.x+=player.movingx*frameratecounter.step; player.y+=player.movingy*frameratecounter.step; if (player.x > xmax) { player.x=-player.width;!! }else if (player.x<-player.width){ player.x=xmax; } } 15
16 Example Excerpt: Animation Principles (3) Rendering the player s ship:!function renderplayership(x,y,rotation, scale) { //transformation context.save(); //save current state in stack context.globalalpha = parsefloat(player.alpha); var angleinradians = rotation * Math.PI / 180; var sourcex=math.floor((player.rotation/10) % 10) * 32; var sourcey=math.floor((player.rotation/10) /10) *32; if (player.thrust){ context.drawimage(shiptiles2, sourcex, sourcey, 32,32,player.x,player.y,32,32); }else{ context.drawimage(shiptiles, sourcex, sourcey, 32,32,player.x,player.y,32,32); }... } 16
17 HTML5 Canvas vs. SVG vs. Flash/Silverlight HTML5 Canvas: Immediate mode (direct drawing on canvas, no structuring of image) Bitmap level SVG, Flash, Silverlight: Retained mode (internal scene graph model rendered to canvas, incremental updates possible) Bitmap or vector level HTML5 Canvas & SVG: Open standards, dependent on acceptance by browser manufacturers Flash, Silverlight etc.: Closed, proprietary standards (browser plugins needed) Popularity determines penetration of plugins to browser population In any case, political decisions are important: Example: Open standard support in MS Internet Explorer Example: Lack of Flash support on Apple ios devices (iphone, ipod, ipad) 17
18 Chapter 2: Interactive Web Applications 2.1! Interactivity and Multimedia in the WWW architecture 2.2! Server-Side Scripting (Example PHP, Part I) 2.3! Interactivity and Multimedia for Web Browsers 2.4! Interactive Server-Side Scripting (Example PHP, Part II) 2.5! Interactive Client-Side Scripting! (Example HTML5/JavaScript) 2.6! Data Storage in Web Applications! (Examples HTML5 & Database Access in PHP) 2.7! Asynchronous Interactivity in the Web (Example AJAX) 18
19 Data Storage Options in the Web: Overview Client-side storage: Necessary to maintain continuity of client interaction Session level: Linking consecutive request/response pairs Long-term level: Personalization, preferences Implemented in browser Traditional solution: Cookies Modern solutions (HTML5): Web Storage, Web SQL Databases Server-side storage: Necessary to get access to and modify global information Implemented on server Simple solution: Server files (see PHP discussion forum example) Powerful solution: SQL database access from server scripts Note: Discussion is focused on Relational Databases and SQL due to their overwhelming popularity Object-oriented databases? 19
20 Client-Side Storage in HTML5: Web Storage Web Storage/DOM Storage: Standardized by W3C, intended as improvement over Cookies Formerly part of HTML5 specification, now separated Purely client-side storage Not transmitted to server with each request Javascript code can issue read and write requests Types of storage: Session storage: Related to window/tab (!), deleted on window closing or browser termination Local storage: Related to domain and maintained after browser termination Data structure: Simple associative array (key/value pairs, both of string type) Similar to Cookies 20
21 Web Storage Example Chrome Advanced Settings 21
22 Web Storage Interface (W3C) Interface Storage (defined independently of implementation language): String getitem(string key); void setitem(string key, String value); void removeitem (String key); void clear(); Top-level browsing context contains two attributes: Storage sessionstorage; Storage localstorage; Shorthand notation in JavaScript due to associative array, example: var firstname = localstorage.firstname; var lastname = localstorage.lastname; When a storage area changes, an event is fired: StorageEvent storage; 22
23 JSON Stringification What to do if only strings can be stored (somewhere)? All data objects (in JavaScript and other languages) can be converted to a String representation XML based Based on JavaScript object constructors: JSON (= JavaScript Object Notation), more space effective JSON.stringify(): Returns string representation JSON.parse(): Converts string representation to JavaScript object Example: {"student": { "identification": [ {"name": "firstname", "value": "Max" }, {"name": "lastname", "value": "Muster" }], "grades": [ ] } } 23
24 Working Offline in Web Applications Web applications often rely on connectivity to the server There are still situations/regions without or with restricted/expensive Internet access! Mobile connections are always in danger of temporary failures Working offline with server-based applications: Client needs a significant amount of logic to give sense to offline work Application needs to specify which parts of the application data is to be kept locally (cached)» Usually a set of files» Cache manifest (= list of files) Browser needs to support access to cached data» interpret cache manifest» maintain application cache 24
25 HTML5 Cache Manifest Cache manifest is a file on the server referenced in the HTML page to be loaded: <!DOCTYPE html> <html lang="en" manifest="time.manifest"> Cache manifest states the files always to be loaded (even from cache)and the files for which there is an alternative: CACHE MANIFEST # version 10 CACHE: index.html time.js time.css FALLBACK: server-time.js fallback-server-time.js 25
26 HTML5 Cache Manifest Demo If file server-time.js is available and delivers server time: If file server-time.js is not available, local fallbackservertime.js is used: Distinction between available files and non-available files is done by the application, adequate reaction is carried out. Non-realtime data are retrieved from local memory. 26
27 Database Management Systems: A Quick Reminder Database: Structured collection of data items Stored persistently Provides access to a common data pool for multiple users Database Management System (DBMS): Collection of programs for administration and usage of a database Various base models for DBMS:» Old: network model, hierarchical model» Dominant: relational model» Alternative: object-oriented model Relational databases: Good methodological support for design of data schema Standardized language interface SQL (Structured Query Language) 27
28 Prerequisites and Basic Architecture Database server Database 1 Database 2 Table 1.1 Table 1.2 Table 2.1 Table 2.2 Administration software User programs Other Servers (e.g. Web Server) 28
29 MySQL Open source software system Frequently used also in commercial context Software package providing: Database server (mysqld) Administration program (mysqladmin) Command line interface (mysql) Various utility programs Communication between programs on local host: socket interface Bidirectional data stream exchange between programs Similar to files 29
30 Before Creating Anything in the Database... Using a database requires careful information design. Which are the data to be stored? Are there existing data to connect to? What is the schema of the data to be stored? Eg. Entity-Relationship diagrams as a tool Transformation into relational database schema (table design) Once a database if filled with data and in use, it is rather difficult to modify! Database schema design has to be carried out with great care! Most important rule: Avoid redundant storage of information 30
31 Creating Database Tables (1) Prerequisites: Database server running Socket connection between programs intact User accounts with adequate privileges known First step: Create database Container for many tables Requires special privileges Example SQL: create database music; Second step: Choose used database Sets the context for further interactions Example SQL: use music 31
32 Creating Database Tables (2) Third step: Create tables According to earlier design Each table should provide a unique identifier (primary key) SQL Example: create table song (code VARCHAR(5), title VARCHAR(20), artist VARCHAR(20), composer VARCHAR(20), runtime INT); Further steps: Defining keys, indices etc. Fourth step: Fill tables with data Simplest case: Individual SQL commands Better: Import from structured data file Frequent: Special programs for importing and creating data SQL Example: insert into song values ('1','One','U2','Adam Clayton, Bono, Larry Mullen & The Edge',272); 32
33 SQL Monitor Output 33
34 Queries with SQL 34
35 Server-Side Databases, PHP and MySQL Special libraries for database access: "Database extensions" Generic for all database systems For specific database systems: "Vendor specific database extensions" For MySQL: MySQL-specific database extensions to PHP 35
36 Connecting to a Database from PHP First step: Connect to server Establish a connection for data exchange between Web Server/PHP plugin and database server Often local (sockets), if both programs on same machine Requires hostname, (database) username, password PHP function: mysql_connect()» Returns a link (resource) which can be used for mysql_close() Second step: Select a database Corresponds to the SQL command use Requires database name (and possibly link to server) PHP function: mysql_select_db()» Returns Boolean result (success) 36
37 Example: Connecting to Database <?php $link = mysql_connect('localhost','root','demopw') or die ('Could not connect: '.mysql_error()); echo 'Connected.<br/>'; mysql_select_db('music') or die ('Could not select db.'); echo 'DB selected.<br/>';...?> 37
38 Sending Database Queries from PHP Basic idea (as in all programming language/database integrations): SQL queries are given as strings to library functions Most important function in MySQL extensions to PHP: mysql_query() Requires SQL query as parameter (optionally link to server as 2nd param.) "Query" includes also INSERT, UPDATE, DELETE, DROP (SQL)! Return value in case of SELECT, SHOW, DESCRIBE and similar: Result set represented by resource value Special functions to retrieve result data as PHP data structures mysql_num_rows()» Number of rows returned mysql_fetch_array()» Reads one row of data and transforms it into an array» Makes the next row available 38
39 Example: Reading Data From a Query in PHP <?php... $query = 'SELECT * FROM song'; $result = mysql_query($query); while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { foreach ($row as $element) { echo $element; echo ', '; } echo("<br/>");...?> dbaccess.php 39
40 Creating HTML Output From SQL Query (1) <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional// EN" " <html> <head> <title>database table in HTML</title> </head> <?php $link = mysql_connect('localhost','root','demopw') or die ('Could not connect: '.mysql_error()); mysql_select_db('music') or die ('Could not select db.');?> dbaccess_html.php 40
41 Creating HTML Output From SQL Query (2)... <body> <h1>the following table is retrieved from MySQL:</h1> <table> <?php $query = 'SELECT * FROM song'; $result = mysql_query($query) or die ('Query failed'.mysql_error()); while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { echo "\t<tr>\n"; foreach ($row as $element) { echo "\t\t<td>"; echo $element; echo "</td>\n"; } echo "\t</tr>\n"; }?> </table> 41
42 Creating HTML Output From SQL Query (3)... <?php mysql_free_result($result); mysql_close($link);?> </body> </html> 42
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