Mike Faust - JavaScript for the Business Developer

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Table of Contents

Appendix A

Javascript Language Quick Reference

The tables in this appendix are intended as a quick reference to JavaScript language elements and CSS properties.

JavaScript Elements

The tables in this section contain JavaScript language elements, including operators and special characters, along with the properties and methods associated with the document and window objects.

Table A.1 : JavaScript Special Characters

Control Character	Description
\f	Form-feed
\r	Carriage return
\n	Linefeed
\t	Horizontal tab.
\v	Vertical tab.
\0	Annual character.
\b	Backspace.
\s	Whitespace (any of [\f\n\r\t\v\u00A0\u2028\u2029]).
\S	Not whitespace
\w	Any alphanumerical character.
\W	Any non-word characters
\d	Any digit
\D	Any non-digit
\xxx	Character with the 2 digit hex code xx
\uxxxx	Unicode character with the four digit hex code xxxx

Table A.2 : JavaScript Variable Operators

Operator	Type	Description
+	Numeric	Addition (result = value1 + value2)
-	Numeric	Subtraction (result = value1 - value2)
*	Numeric	Multiplication (result = value1 * value2)
/	Numeric	Division (result = value1 / value2)
%	Numeric	Modulus remainder after division(result = value1 % value2)
++	Numeric (Unary)	Increment by 1 (result++)
Numeric (Unary)	Decrement by 1 (result)
+	String	Concatenate (stringreslut = string1 + string2)
==	Comparison	Equal to (value1 == value2)
!=	Comparison	Is Not Equal to (value1 != value2)
>	Comparison	Greater than (value1 > value2)
>=	Comparison	Greater than or Equal to (value1 >= value2)
<	Comparison	Less than (value1 < value2)
<=	Comparison	Less than or Equal to (value1 <= value2)
===	Comparison	IdenticalEqual to with type comparison (value1 === value2)
!==	Comparison	Not Identical (value1 !== value2)
=	Assignment	Set value (result = value)
+=	Assignment	Increment and set (result += 12 would be the same as result = result + 12)
-=	Assignment	Decrement and set (result -= 12)
*=	Assignment	Multiply and set (result *= 2)
/=	Assignment	Divide and set (result /= 3)
%=	Assignment	Perform modulus and set (result %= 6)
&=	Assignment	Perform Bitwise AND and set value (result &= value)
|=	Assignment	Perform Bitwise OR and set value (result |= value)
^=	Assignment	Perform Bitwise XOR and set value (result |= value)
<<=	Assignment	Bitwise Left shift and set with 0 fill (result <<= 2)
>>=	Assignment	Bitwise Right shift and set self-propagating (Result >>= 2)
>>>=	Assignment	Bitwise Right shift and set with 0 fill (result >>>= 2)
&&	Boolean	Logical AND operation if(val1=1 && val2=2)
||	Boolean	Logical OR operation if(val1=1 || val2=2)
!	Boolean	Logical NOT operation (if !(val1 = val2))
&	Bitwise	Bitwise AND (result = val1 & val2
|	Bitwise	Bitwise OR (result = val1 & val2)
~	Bitwise	Bitwise NOT (result =!bit1 )
<<	Bitwise	Bitwise Left Shift/zero fill (result = 8 << 2)
>>	Bitwise	Bitwise Right Shift/self-propagating (result = 8 >> 2)
>>>	Bitwise	Bitwise Right Shift/zero fill (result = 8 >>> 2)

Table A.3 : JavaScript Bitwise Operators

Statement	Operation description
X = 7 & 43;	00000111 & 00101011 = 00000011 = 3
X= 7 | 43	00000111 | 00101011 = 00101111 = 47
X= ^7	~ 0111 = -1000 = -8
<<	0000 0100 << 4 = 0100 0000 or 4 << 4 = 64
>>	0000 1100 >> 2 = 0000 0011 or 12 >> 2 = 3
>>>	0000 1100 >>> 2 = 0000 0011 or 12 >>> 2 = 3

Table A.4 : Properties Associated with the window Object

Property	Description
window.closed	This property returns a Boolean value that identifies whether or not a specific window has been closed.
window.defaultStatus	Used to access the information displayed in the status bar once the document loads.
window.dialogArguments	Used to retrieve variables passed into a browser dialog window.
window.dialogHeight	Reads and updates the height of a browser dialog window.
window.dialogLeft	Reads and updates the leftmost coordinate of a browser dialog window.
window.dialogTop	Reads and updates the top coordinate of a browser dialog window
window.dialogWidth	Reads and updates the width of a browser dialog window.
window.length	Identifies the number of frames within the window object.
window.name	Used to set or read the name of the window object.
window.offscreenBuffering	A Boolean value that identifies whether or not the window is generated off screen prior to displaying to the user.
window.opener	Used as a reference to the window that opened the current window.
window.parent	Identifies the parent of the current window.
window.returnValue	Used to define a return value from a browser dialog window to the main browser window.
window.screenLeft	The leftmost position of the browser window relative to the screen
window.screenTop	The top position of the browser window relative to the screen.
window.self	Used to reference the current window.
window.status	Used to read or update the status bar text for the browser window.
window.top	Used to identify the uppermost parent window to the current window.

Table A.5 : Event Handlers Associated with the window Object

Event	Description
window.onblur	Defines action to be performed when the window is no longer in focus.
window.onerror

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