Overview. In the beginning. Issues with Client Side Scripting What is JavaScript? Syntax and the Document Object Model Moving forward with JavaScript
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2 Overview In the beginning Static vs. Dynamic Content Issues with Client Side Scripting What is JavaScript? Syntax and the Document Object Model Moving forward with JavaScript AJAX Libraries and Frameworks JavaScript 2.0 A New Beginning? Resources 2
3 In the beginning HTML allowed people to display content on the World Wide Web (WWW) Fairly straight-forward tags and easy to learn As the WWW has evolved, demand for greater control over the look and feel of a page WWW is a dynamic medium and HTML is not able to handle this Web pages need to interact with their users and vice-versa Need to make use of a scripting language to handle interactivity Ability to render/produce HTML to be displayed in the browser Users want dynamic web pages; not static 3
4 Static vs. Dynamic Content Why does it matter? Pre-determined vs. Interactive Persistent Layout vs. Personalisation Message vs. Service HTML/CSS vs. PHP, ASP, Ruby Implementation & Maintenance 4
5 Issues with Client Side Scripting Performance Dependency Incomplete Scripts Identification Flexibility Data Layout Language 5
6 What is JavaScript? JavaScript is not Java Although there are some similarities regarding syntax and functionality Cat.paws.back.left Car.start(), document.write() Java is a fully functional object-oriented programming language JavaScript is designed to run within a Web browser and interact with HTML and DOM (Document Object Model) JavaScript can be placed anywhere on a Web page Just need to be enclosed in a <script> tag 6
7 What is JavaScript? A client side scripting language which can provide interactivity within Web pages Developed by Netscape in 1995 Has evolved a lot since its creation Depending on the browser, it has also developed in different directions It is an object based language It uses prototypes to simulate inheritance, which means you can define classes and use them at the same time Client side means it works on your machine Your Web browser processes the scripts, not the server 7
8 Alternatives to JavaScript ECMAScript JavaScript ActionScript VBScript/JScript E4X (ECMAScript for XML) LiveScript TCL/TK XUL/XSLT 8
9 ECMAScript What s that? Standardised scripting language Widely used on the Web Developed out of a need for standards JavaScript & JScript (Microsoft version of JavaScript) were supposed to be the same, but they are not Number of dialects or implementations of ECMAScript are available today ActionScript Objective-J WMLScript 9
10 ECMAScript Dialects - Syntax JavaScript document.write('hello World!'); ActionScript var greet:textfield = new TextField(); greet.text = "Hello World"; this.addchild(greet); JScript document.write( Hello World"); 10
11 Syntax JavaScript offers similar functionality to Java Variables Operators, Comparisons & Conditions Control Structures if, else, for, switch, etc. Functions You can stop the browser executing code at runtime by putting it in a function You then make a call to the function to execute the code In many ways, it looks very similar to Java But it isn t! 11
12 Syntax Example (1) <html><head></head> <body> <script type="text/javascript"> document.write( <h1>hello World</h1> ); </script> </body> </html> Accessing object & method declaration Important!! property 12
13 Syntax Example (2) <html><head> <script type="text/javascript"> function myfunc(value) { alert(value); } </script></head> <body><form> <input type= button onclick="myfunction('howdy')" value= Ok ></form> </body> </html> Action to be executed Calling the function Declaration Declare function Argument/Parameter 13
14 Syntax Example (3) Control structures if else if (condition) { some code } else { some code } var colorchoice = prompt( What is your favourite color? ); if (colorchoice== Blue ) Condition { document.write( That s the right answer! );} else { document.write( Sorry, that s not correct! );} Do this if true Do this if false 14
15 Syntax Example (4) Conditions var hour = 11; var minute = 0; And = && if (hour==12 && minute==0) { alert("it's noon") }; Or = if (hour==11 hour==10) { alert("it's less than 2 hours till noon") }; Not =! if (!(hour==11)) { alert("it's more than 1 hour till noon") }; 15
16 Document Object Model (DOM) document html head title text My Page document.write( Hello World ); body p text Some Text Figure 12.1 The tree structure, showing nodes is just another way of looking at how a HTML page is organised Source: Negrino & Smith (2007:283) 16
17 DOM Accessing data The DOM proves to be a useful tool when trying to add interactivity to your Web page Use the tree structure to trace the path through the nodes How do we get access to that data? Follow the path! <html><head></head> <body> <form name= frmsample > </form> <body></html> <input type= text name= txtname > document.frmsample.txtname.value; 17
18 DOM Retrieving data You can use the DOM to retrieve data /values contained within a web page <form name= frmsample > <input type= text name= txtname > <p id= text ></p> </form> How do we get access to that data? var uname = document.frmsample.txtname.value; alert("text is: " + uname); document.getelementbyid( text ).innerhtml = uname; 18
19 Moving forward with JavaScript The WWW is always changing Advances have given us Google Maps, Flickr, MyYahoo These sites function more like desktop applications as opposed to Web sites Faster, more responsive User Interface (UI) Superior interaction and a better User Experience (UE) Technology behind these sites was AJAX Asynchronous JavaScript and XML It is not a new technology. Just a new way of using existing technologies 19
20 What is AJAX? Coined by Jesse James Garret in 2005 A technique combining long standing Web technologies XHTML and CSS for structure and presentation DOM for displaying an manipulating pages XML for formatting data XMLHttpRequest object to transfer data Similar to Microsoft s ActiveX Object (the yellow bar in IE?!?) JavaScript to display and interact with the above Web sites can offer more functionality by communicating with a Web server through JavaScript Normally, you need to make use of a server side scripting language to communicate with a server (e.g. PHP, Ruby, etc.) 20
21 Time Traditional Web Application User activity Data transmission Data transmission System processing User activity Data transmission Data transmission System processing User activity Synchronous page requests and refreshes Source: Vossen, G. & Hageman, S. (2007) Unleashing Web 2.0 Morgan Kaufmann: USA p147 21
22 Time AJAX Web Application Browser UI AJAX engine Data transmission Data transmission System processing Data transmission Data transmission System processing Asynchronous page refreshes Source: Vossen, G. & Hageman, S. (2007) Unleashing Web 2.0 Morgan Kaufmann: USA p148 22
23 JavaScript Today As we have seen, it is pretty simple to make web pages dynamic Collecting user data, displaying a message, passing variables You could create your own functions But it takes time and effort and you may get it wrong(!) What if we could make it simpler Use pre-defined functions and features to ensure consistency across your Web site All you need to do is to make a reference to them In most cases, it reduces the amount of coding 23
24 Libraries and Frameworks Pre-written functions which can aide in the development of Web apps Serve a number of purposes (Animation, DOM access, AJAX) Allow integration with other languages such as CSS, PHP, Ruby Similar thing when coding in ActionScript/Java import flash.display.sprite; Similar to referencing an external CSS <link href= mystyle.css rel= stylesheet media= screen /> There is more of a demand for dynamic Web apps Less emphasis on simple things, more on AJAX 24
25 Libraries vs. Frameworks Frameworks are more like APIs and are different to Libraries Enhances everything, not just the Document Object Model Arrays, Strings, Data Types, Classes Most libraries state that they are frameworks Some may offer the functionality, but they not be known for it Why the fuss? Libraries can be easier to navigate understand Frameworks take the whole of the JavaScript language into account But they will still offer all the goodies of a library 25
26 What is available Libraries jquery (Although it does have functionality to be a framework), Yahoo UI (YUI), MochiKit, Dojo Toolkit, script.aculo.us, Google Web Toolkit (GWT), Frameworks Prototype, ExtJS, MooTools, Spry What do they offer? DOM Manipulation & Traversal Animation/Effects AJAX & CSS Plug-ins 26
27 Examples jquery W3Schools.com/jquery / Animated Robot Yahoo UI / Image Slideshow Script.aculo.us / Drag and drop functionality MooTools / Toggle display ExtJS / Drag and Drop 27
28 Making a choice Features What is that you are trying to create? Are any ruled out initially? Documentation & Examples Clear instructions, Tutorials, Demos readily available? File Size Is the whole of the file needed, or can you just make use with certain aspects? Is there a minified version? License Is it free? Or is there a small print detailing a charge for commercial use? Ease of use How easy is it to pick up? Libraries are easy to pick up 28
29 JavaScript 2.0 A New Beginning? The next major revision of the language Also known as ECMAScript 4 Currently under development, now under the code name Harmony Motivated by the need to achieve better support for programming in the large (Horwat, n.d.) Does not mean creating large programs, rather programs Written by more than one person Assembled from packages Live in heterogeneous environments That evolve over time New functionality makes JavaScript look more like a programming language However, it is not meant be a high performance programming language for writing large, complex programs Isn t that what Java is for?! Two key features Optional types and checking Ability to support classes and objects 29
30 JavaScript 2.0 A New Beginning? Optional types & type checking More similar to Java when creating variables, e.g. var username = Pete (old) var username:person = Pete (new) Ability to create classes No need for the use of functions to simulate inheritance Can create classes in the same was as Java (for example) Other features include Versioning Conditional compilation Creating code to run in a number of environments Better mappings for data types and interfaces And more. All in all, a much more structured language for the Web But it has not been implemented for use yet! JavaScript is the latest stable version, but does not support any of the above! 30
31 Summary JavaScript is a complex language Each section in this presentation could have one presentation to itself! JavaScript Java Although there are some similarities It is powerful language when it comes to creating content for the Web Has a number of benefits compared to Adobe Flash But it is not the only language Libraries and Frameworks are designed to make it easier You just need to pick the one(s) best for your project JavaScript 2.0 is an attempt to make the language more object oriented Should make it easier when trying to create Web applications But it is not ready for implementation yet There are a LOTS of resources available to help you learn JavaScript Some are mentioned on the next slide 31
32 Three resources I would recommend W3Schools.com Resources on JavaScript, AJAX, VBScript and others. One of the best sites I have found to give you an introduction to a particular langaage JavaScript and AJAX for the Web Tom Negrino and Dori Smith, 7 th edition An excellent book, with plenty of examples you can use to help you learn the language Head First JavaScript Michael Morrison Part of the Head First series, these books are really simple to understand and explain complex issues in a more interesting way! 32
33 References/Bibliography Chapman, N. & Chapman, J. (2006) Web Design A Complete Introduction. John Wiley & Sons Ltd: Chichester. Jackson, J.C. (2007) Web Technologies A Computer Science Perspective. Pearson Education Inc.: USA. Horwat, W. (n.d.) JavaScript 2.0: Evolving a Language for Evolving Systems. Morrison, M. (2008) Head First JavaScript. Sebastopol: O Reilly. Moseley, R. (2007) Developing Web Applications. Chichester: John Wiley & Sons Ltd. Negrino, T. & Smith, D. (2008) JavaScript and AJAX for the Web.7 th ed. Berkley, CA: Peachpit. Resig, J. (2006) Pro JavaScript Techniques. APRESS Top Ten JS Frameworks - Compare JavaScript Frameworks - Ten Promising JS Frameworks - Choice of JavaScript Framework - W3Schools (2007) AJAX Tutorial. W3Schools (2007) JavaScriptTutorial. Vossen, G. & Hagemann, S. (2007) Unleashing Web 2.0. Burlington: Morgan Kaufmann. 33
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