Chapter 04 Java Script Web Systems and Technologies Content What is JavaScript The Foundation of JavaScript Syntax The Core language Objects in JavaScript Document Object Model (DOM) and The Brows.
Web Systems and Technologies Chapter 04 Java Script Content What is JavaScript The Foundation of JavaScript Syntax The Core language Objects in JavaScript Document Object Model (DOM) and The Browser Objects in JavaScript The Foundation of JavaScript Syntax What is JavaScript It is a scripting language that can be used to create client-side scripts and server-side scripts JavaScript makes it easier to create dynamic and interactive Web pages JavaScript is a scripting language developed by Sun Microsystems and Netscape JavaScript developed from Netscapes’s Livescript Client applications run in a browser such as Netscape Navigator, Google Chrome, FireFox or Internet Explorer JavaScript Advantages JavaScript allows interactivity such as: Implementing form validation React to user actions, e.g handle keys Changing an image on moving mouse over it Sections of a page appearing and disappearing Content loading and changing dynamically Performing complex calculations Custom HTML controls, e.g scrollable table Implementing AJAX functionality What Can JavaScript Do? Can handle events Can read and write HTML elements and modify the DOM tree Can validate form data Can access / modify browser cookies Can detect the user’s browser and OS Can be used as object-oriented language Can handle exceptions Can perform asynchronous server calls (AJAX) Embedding JavaScript in Web Page The JavaScript can be inserted into an HTML document in the following ways : Using SCRIPT tag: Using an external File