ITSE 1359 Intro to JavaScript Chapter 1

What is JavaScript?

a programming language that adds complex interactive features to a website.

When did JavaScript had its origins?

JS had its origins in the mid-1990s with the creation of the World Wide Web or web

“When JavaScript first appeared in 1995, it was used to ____________”

handle as much of that validation as possible to speed up customer transactions (in the business world)

What is a programming language?

A set of instructions directing the actions of the computer or computer device

T/F “Before these instructions can be performed, they need to be compiled (programming lang)”

True

What does compiled mean?

A process by which instructions from a programming language are transformed into machine code.

What is a scripting language?

A subcategory of programming languages that are interpreted rather than compiled and run directly from a program or script, often used to control a web page or return some sort of response to a web browser.

T/F “Scripting languages need to be interpreted, in which the code is read line-by-line by an interpreter that scans the code for errors even as it runs.”

True

T/F “A JavaScript interpreter is built into every web browser”

true

How do you create a JS program?

you only need a text editor and web browser to run it

What is a Markup language?

A language that defines the content, structure, and appearance of a document.

What are the differences b/w HTML, CSS, and JS

What is JScript?

An early version of JavaScript used by Microsoft Internet Explorer in the 1990s.

Why was JS submitted to the ECMA in 1997?

-as a proposal for a standardized scripting language that would work across a wide range of devices and browsers.

-set the standards for that language 

What is ECMAScript?

An international, standardized version of JavaScript.

What are the three core foundations upon which JavaScript is built?

• ECMAScript

• Document Object Model (DOM)

• Browser Object Model (BOM)

What does ECMAScript do?

• it is the core of the programming lang

• provides he syntax, keywords, properties, methods, and general structure for writing code.

What is the Document Object Model (DOM)

it describes how to access the contents of the web page and user actions within that page.

What is the Browser Object Model (BOM)

it describes how to access the features and behaviors of the browser itself

The Document Object Model and the Browser Object Model are examples of what?

an Application Programming Interface (API)

What is an API?

A set of procedures that access an application such as a web page or a web browser.

T/F “Both the DOM and the BOM have formal set of standards”

• False

• there is no formal set of standards for the Browser Object Model

What is a server?

A device or application from which a client requests information

How does a server fulfill a request for info

by managing the request or serving the requested information to the client

A system consisting of a client and a server is known as

two-tier system

What is the role of a client in a two-tier system

• the presentation of an interface to the user.

• The user interface gathers info from the user, submits it to a server

• then it receives, formats, and presents the results returned from the server

What are the main responsibilities of a server

• data storage

• management

• communicating with external services