Online Forms and JavaScript Basics Quiz

Online Forms

• Online forms are web pages designed to gather information on the Internet
• HTML body tags are used to create online forms
• Input tags are used to specify the type of input required
• Name attribute is used to distinguish one input field from another

What is a Script?

• A script is a set of computer instructions or commands that connect existing components to accomplish a new task

What is JavaScript?

• JavaScript is a powerful client-side scripting language
• It is interpreted by the web browser
• Enables web developers and designers to build more functional and interactive websites

JavaScript Origins

• Developed by Brendan Eich in September 1995
• Originally named Mocha, later renamed to LiveScript and finally JavaScript

Characteristics of JavaScript

Interpreted Language

• JavaScript is an interpreted language, requiring a browser to run
• Unlike Java, which needs code to be compiled before execution

Scripting Language

• Scripting languages are used to perform simple repetitive tasks
• They do not have their own interfaces, but provide instructions to other programs
• JavaScript is a scripting language, used to change webpage elements through the browser

Client-Side Scripting

• Client-side scripting executes on the user's machine
• JavaScript is a client-side scripting language
• Server-side scripting (e.g., ASP, PHP, JSP) executes on the server machine

Object-Oriented Programming

• JavaScript presents elements as objects, allowing easy manipulation
• OOP treats system elements as objects, with associated functions (methods)

Text Editor and File Extensions

• MS Notepad is a text editor that comes with Windows
• JavaScript code embedded in HTML files do not need modifications to file extensions (.htm or .html)
• Large scripts can be saved in separate files with a .js extension and loaded into a browser

Objects, Methods, and Properties

• Objects are items that exist in the browser (e.g., browser window, page, status bar, date and time)
• Methods are actions performed on or by an object (e.g., doing math or parsing strings)
• Properties are existing subsections of an object

Events

• Events are occurrences or actions (e.g., loading a page, holding a mouse over a link, or clicking a link)
• Scripts can be written to execute when a specific event occurs