JavaScript is not java

no graphical user interface, read/write file access, not class based, NEEDS A BROWSER

what JavaScript can do client side

control browser features, modify document content, manipulate images

visual enhancement that CSS can't do, advanced animation (NOT a replacement)

where to JavaScript in own file

src 'inputValidator', type = 'text/javascript'

can be letters, digits, underscores, $ (NOT a space or starting w/ a digit)

do {code} while(condition); **runs at least once

window.alert() document.write()

b = a++ b takes on a value, then a gets incremented

b = ++a a is incremented first, than b takes on new a value

math, string, date/time, arrays

ways to return control to function

right brace, executing return or "return expression"

adds new element to end of array

removes last element and returns it

removes first element and returns it

allow scripts to respond to user interactions and modify the page

happens when the window load object fires, all children and external files are loaded

a function that responds to an event (addEventListenter)

when mouse hovers over element, event occurs

when mouse moves away from element, event occurs

alert(), setTimeout (calls function for number of milliseconds), setInterval (call function at interval milliseconds)

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Web DSS Exam 2 again

JavaScript

Term	Definition
JavaScript pros	adds interactivity, mainly used for client side execution (run on browser)
JavaScript cons	client may not have enough processing resources, can be turned off for security
JavaScript is not java	no graphical user interface, read/write file access, not class based, NEEDS A BROWSER
what JavaScript can do client side	control browser features, modify document content, manipulate images
JavaScript CSS	visual enhancement that CSS can't do, advanced animation (NOT a replacement)
where to put JavaScript embedded	<script>
where to JavaScript in own file	src 'inputValidator', type = 'text/javascript'
Javascript variables	can be letters, digits, underscores, $ (NOT a space or starting w/ a digit)
is JavaScript case sensitive?	YES
A JavaScript function without a name is called…?	anonymous function
JavaScript addition, subtraction, increment	+, -, ++
logical operators (and, or, not)	&& (and), \|\| (or), ! (not)
JavaScript comment	/code/
string concatenation	x = '5' + 5 x = '55'
date and time	new Date()
conditional if, else	if (condition) {} else {};
conditional while	while (condition){};
conditional loop	do {code} while(condition); **runs at least once
input/output in JavaScript	limited bc of security
output examples	window.alert() document.write()
input examples	window.prompt() confirm()
debug examples	console.log()
post increment	b = a++ b takes on a value, then a gets incremented
pre increment	b = ++a a is incremented first, than b takes on new a value
JavaScript functions	math, string, date/time, arrays
JavaScript function format	function () {}
ways to return control to function	right brace, executing return or "return expression"
can functions be referenced by a variable or another function?	yes
an array is represented by what symbols?	[]
the first element in an array is what?	0
push()	adds new element to end of array
pop()	removes last element and returns it
shift()	removes first element and returns it
JavaScript events	allow scripts to respond to user interactions and modify the page
load event	happens when the window load object fires, all children and external files are loaded
event handler	a function that responds to an event (addEventListenter)
mouseover event	when mouse hovers over element, event occurs
mouseout event	when mouse moves away from element, event occurs
window object	open window in browser
window methods	alert(), setTimeout (calls function for number of milliseconds), setInterval (call function at interval milliseconds)
document object	the root of an HTML element
DOM	Document Object Model
DOM specifies...	HTML and XML elements
JavaScript can edit...
A node can have multiple children and how many parents?
the html node in a DOM tre is called?
document.getElementbyId()
document.queryselectorAll()
dot operator returns element attribute values like...
document.getElementsByTagName()
DOM Collections
collection length
document.images[0]
element.innerHTML
element.style.visibility = "hidden"
document.write(text)

Created by: naddotey

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