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js_tutorial

Javascript

Javascript document.writeln("str.charAt(3) is:" + str.charAt(3)); document.writeln("str.charAt(4) is:" + str.charAt(4)); document.writeln("str.charAt(5) is:" + str.charAt(5)); Output str.charAt(0) is:T str.charAt(1) is:h str.charAt(2) is:i str.charAt(3) is:s str.charAt(4) is: str.charAt(5) is:i charCodeAt () This method returns a number indicating the Unicode value of the character at the given index. Unicode code points range from 0 to 1,114,111. The first 128 Unicode code points are a direct match of the ASCII character encoding. charCodeAt() always returns a value that is less than 65,536. Syntax Use the following syntax to find the character code at a particular index. string.charCodeAt(index) Argument Details index: An integer between 0 and 1 less than the length of the string; if unspecified, defaults to 0. Return Value Returns a number indicating the Unicode value of the character at the given index. It returns NaN if the given index is not between 0 and 1 less than the length of the string. Example 142

Javascript Try the following example. JavaScript String charCodeAt() Method var str = new String( "This is string" ); document.write("str.charCodeAt(0) is:" + str.charCodeAt(0)); document.write("str.charCodeAt(1) is:" + str.charCodeAt(1)); document.write("str.charCodeAt(2) is:" + str.charCodeAt(2)); document.write("str.charCodeAt(3) is:" + str.charCodeAt(3)); document.write("str.charCodeAt(4) is:" + str.charCodeAt(4)); document.write("str.charCodeAt(5) is:" + str.charCodeAt(5)); Output str.charCodeAt(0) is:84 str.charCodeAt(1) is:104 str.charCodeAt(2) is:105 str.charCodeAt(3) is:115 str.charCodeAt(4) is:32 str.charCodeAt(5) is:105 contact () This method adds two or more strings and returns a new single string. Syntax Its syntax is as follows: string.concat(string2, string3[, ..., stringN]); 143

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    About the Tutorial JavaScript is a

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    Bitwise Operators .................

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    23. String ........................

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    setUTCDate () .....................

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    Checking for Plug-Ins .............

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    1. OVERVIEW Javascript What is Java

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    Javascript components, integrates w

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    Javascript This function can be use

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    Javascript The following example sh

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    Javascript JavaScript in Chrome Her

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    4. PLACEMENT Javascript There is a

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    Javascript This code will

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    5. VARIABLES Javascript JavaScript

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    Javascript Within the body of a fun

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    6. OPERATORS Javascript What is an

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    Javascript the right operand, if ye

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    Javascript Output (a == b) => false

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    Javascript Output (a && b) => fal

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    Javascript document.write("(a | b)

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    Javascript Ex: C /= A is equivalent

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    Javascript Set the variables to dif

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    Javascript Function Undefined Null

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    7. IF-ELSE Javascript While writing

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    Javascript Output Qualifies for dri

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    Javascript Try the following code t

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    Javascript Syntax The objective of

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    Javascript switch (grade) { case 'A

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    Javascript Syntax The syntax of whi

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    Javascript do{ Statement(s) to be e

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    10. FOR LOOP Javascript The for Loo

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    Javascript Current Count : 6 Curren

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    Javascript Set the variable to diff

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    Javascript Set the variable to

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    Javascript Entering the loop 2 3 4

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    Javascript Output Entering th

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    13. FUNCTIONS Javascript A function

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    Javascript Click the following butt

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    Javascript Click the following but

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    Javascript Use different parameters

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    Javascript var variablename = funct

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    14. EVENTS Javascript What is an Ev

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    Javascript ....... onmouseove

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    Javascript ondragenter script Trigg

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    Javascript onplaying script Trigger

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    15. COOKIES Javascript What are Coo

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    Javascript Enter name: Outp

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    Javascript Setting Cookies Expiry D

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    Javascript Output Enter Cookie Na

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    Javascript Example Try the followin

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    Javascript var len = this.length; v

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    Javascript join () Javascript array

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    Javascript var from = Number(argume

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    Javascript } var index = [12, 5, 8,

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    Javascript Array.prototype.map = fu

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    Javascript Its syntax is as follows

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    Javascript var rv = arguments[1]; }

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    Javascript } } throw new TypeError(

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    Javascript } rv = this[i--]; break;

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    Javascript } rv = fun.call(null, rv

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    Javascript Output Removed element

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    Javascript { } if (i in this && fun

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    Javascript Return Value Returns a s

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    Javascript toString () Javascript a

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    25. DATE Javascript The Date object

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    Javascript Return Value Returns the

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    Javascript Date Methods Here is a l

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    Javascript universal time. setUTCMo

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    Javascript Syntax Its syntax is as

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    Javascript Example Try the followin

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    Javascript var dt = new Date(); d

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    Javascript getMonth() : 11 getSecon

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    Javascript Syntax Its syntax is as

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    Javascript Try the following exampl

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    Javascript Output getUTCHours() :

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    Javascript Syntax Its syntax is as

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    Javascript JavaScript getYear Met

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    Javascript JavaScript setFullYear

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    Javascript If you specify a number

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    Javascript monthValue : An integ

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    Javascript setTime () Javascript da

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    Javascript Date.setUTCFullYear(year

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    Javascript document.write( dt );

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    Javascript Try the following exampl

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    Javascript Example Try the followin

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    Javascript var dt = new Date(1993,

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    Javascript toLocaleDateString () Ja

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    Javascript Syntax Its syntax is as

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    Javascript For instances of Date,

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    Javascript var dateobject = new

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    Javascript Output 743850547000 Date

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    Javascript minutes : An integer

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    Javascript In the following section

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    Javascript Example Try the followin

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    Javascript Property Value is : 0.43

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    Javascript JavaScript Math SQRT2 P

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    Javascript Try the following exampl

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    Javascript First Test Value : 3.141

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    Javascript JavaScript Math atan() M

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    Javascript var value = Math.atan2(+

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    Javascript Example Try the followin

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    Javascript Output First Test Value

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    Javascript var value = Math.log(10

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    Javascript min ( ) This method retu

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    Javascript var value = Math.pow(7,

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    Javascript Return Value Returns the

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    Javascript Output First Test Val

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    Javascript Example Try the followin

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    27. REGEXP Javascript A regular exp

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    Javascript Examples Following examp

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    Javascript m g Specifies that if th

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    Javascript Try the following exampl

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    Javascript Test1 - ignoreCase prope

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    Javascript if ( re.multiline ){ doc

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    Javascript exec ( ) The exec method

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    Javascript document.write("Test 2 -

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    Javascript document.write("Test 1 -

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    Javascript There are several DOMs i

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    Javascript forms[ ] 9 An array of F

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    Javascript Ex: document.close( ) op

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    Javascript This is main title Click

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    Javascript createElement( tagName)

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    Javascript NOTE: This example r

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    Javascript Specifies the loading st

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    Javascript NOTE: This example

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    Javascript Part 3: JavaScript Advan

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    Javascript Logical Errors Logic err

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    Javascript Now let us try to catch

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    Javascript Output Click the followi

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    Javascript Click the following to s

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    30. FORM VALIDATION Javascript Form

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    Javascript Basic Form Validation Fi

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    Javascript var emailID = document.m

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    Javascript Manual Animation So let'

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    Javascript } function moveRight(){

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    Javascript It is not possible to s

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    Javascript Output Checking for Plug

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    Javascript //--> If you

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    Javascript Error Messages in Firefo

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    Javascript Use a JavaScript Debugge

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    34. IMAGE MAP Javascript You can us

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    Javascript Output You can feel the

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    Javascript 6 plugins[] This propert

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    Javascript document.write(" Browser