JavaScript

JavaScript

JavaScript is a cross-platform,object-oriented programming language.It is a small and lightweight language.

Client Side || Server Side

Javascript is all about making content of web document dynamic.

JavaScript can do…

Provides HTML designers a programming Tool
Can put dynamic test into HTML/ read and write in html documents
Can react to events
can be used to validate data
.......

Popular Javascript Frameworks

Angular*JS
ReactJS
NodeJS
VueJS
EmberJS
MeteorJS

Data Types in Javascript

Boolean
Null
Undefined
Number
String
Objects

Basics of JavaScript

Everything is case sensitive

variables are loosely typed

    	// integer 
    	var a = 10;
    	// string 
    	var favoriteColor = "red";
    	// boolean 
    	var canDriveCar = false;

var keyword is used
variables need not have to be declared before using

Document Object Model (DOM)

application programming interface(API) for valid HTML documents.It defines the logical structure of documents and the way a document is accessed and manipulated.

DOM…

A web page is a document
DOM provides the way to represent,store and manipulate the document(web page).
Object Oriented representation of web page
DOM is not a programming language

Some DOM methods

document.getElementById(“id”)
document.getElementsByTagName(name)
document.getElementsByClassName(name)
document.createElement(name)
parentNode.appendChild(node)
element.innerHTML
element.style.*
element.setAttribute(attribute,value)
element.getAttribute
element.addEventListener
document.appendChild(element)
document.replaceChild(element)
document.write(text)