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JavaScript Fundamentals: An Overview, Lecture notes of Web Programming and Technologies

Dayananda Sagar University Web Programming and Technologies

Web lab manual with theory notes

Typology: Lecture notes

2018/2019

Uploaded on 10/27/2019

kruti-kriti 🇮🇳

2 documents

1 / 67

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Overview of JavaScript

➢Originally developed by Netscape

➢Joint Development with Sun Microsystems in 1995

➢Standard 262 (ECMA-262) of the European Computer Manufacturers Association

➢ECMA-262 edition 3 is the current standard

•Edition 4 is under development

➢Supported by Netscape, Mozilla, Internet Explorer

➢Differences

JavaScript has a different object model from Java

JavaScript is not strongly typed

➢Java 1.6 has support for scripting

http://java.sun.com/javase/6/docs/technotes/guides/scripting/index.html

➢Mozilla Rhino is an implementation of JavaScript in Java

http://www.mozilla.org/rhino/

Origins

Java and JavaScript

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Overview of JavaScript

➢ Originally developed by Netscape ➢ Joint Development with Sun Microsystems in 1995 ➢ Standard 262 (ECMA-262) of the European Computer Manufacturers Association ➢ ECMA- 262 edition 3 is the current standard

Edition 4 is under development ➢ Supported by Netscape, Mozilla, Internet Explorer ➢Differences JavaScript has a different object model from Java JavaScript is not strongly typed ➢Java 1.6 has support for scripting http://java.sun.com/javase/6/docs/technotes/guides/scripting/index.html ➢Mozilla Rhino is an implementation of JavaScript in Java http://www.mozilla.org/rhino/ Origins Java and JavaScript

JavaScript Components

➢ Core

The heart of the language

➢ Client-side

Library of objects supporting browser control and user interaction

➢ Server-side

Library of objects that support use in web servers

➢ Text focuses on Client-side

XHTML/JavaScript Documents ➢ When JavaScript is embedded in an XHTML document , the browser interpret ‘s it with Java Interpretor to run or execute. ➢ Two locations for JavaScript server different purposes

JavaScript in the head element will react to user input and be called from other locations
JavaScript in the body element will be executed once as the page is loaded ➢ Various strategies must be used to ‘protect’ the JavaScript from the browser
For example, comparisons present a problem since < and > are used to mark tags in XHTML
JavaScript code can be enclosed in XHTML comments
JavaScript code can be enclosed in a CDATA section

JavaScript in XHTML: CDATA ➢ The block is intended to hold data that should not be interpreted as XHTML ➢ Using this should allow any data (including special symbols and -- ) to be included in the script ➢ This, however does not work, at least in Firefox: **__** ➢ The problem seems to be that the CDATA tag causes an internal JavaScript error **JavaScript in XHTML** ➢ This does work in Firefox **__** ➢ The comment symbols do **not bother the XML parser** (only /* and */ are ‘visible’ to it) ➢ The comment symbols protect the CDATA markers from the JavaScript parser

➢ Directly embedded < **_script type=“text/javascript”>

_** ➢ However, note that a-- will not be allowed here! ➢ **Indirect reference** **_

JavaScript Fundamentals: An Overview, Lecture notes of Web Programming and Technologies

Related documents

Partial preview of the text

Download JavaScript Fundamentals: An Overview and more Lecture notes Web Programming and Technologies in PDF only on Docsity!

Overview of JavaScript

JavaScript Components

➢ Core

The heart of the language

➢ Client-side

Library of objects supporting browser control and user interaction

➢ Server-side

Library of objects that support use in web servers

➢ Text focuses on Client-side