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Create an XMLHttpRequest object with the

XMLHttpRequest()

constructor (see the sidebar in

§18.1 for information on how to create an XMLHttpRequest object in IE6) and then use it

like this:

1. Call

open()

to specify the URL and method (usually “GET” or “POST”) for the request.

2. Set the

onreadystatechange

property to the function that will be notified of the progress

of the request.

3. Call

setRequestHeader()

, if needed, to specify additional request parameters.

4. Call

send()

to send the request to the web server. If it is a POST request, you can also

pass a request body to this method. Your

onreadystatechange

event handler function will

be invoked as the request proceeds. When

readyState

is 4, the response is complete.

5. When readyState is 4, check the

status

code to ensure that the request was successful.

If so, use

getResponseHeader()

getResponseHeaders()

to retrieve values from the re-

sponse header, and use the

responseText

responseXML

properties to obtain the response

body.

XMLHttpRequest defines a relatively high-level interface to the HTTP protocol. It takes care

of details such as handling redirects, managing cookies, and negotiating cross-origin connec-

tions with CORS headers.

The XMLHttpRequest features described above are well supported by all modern browsers.

At the time of this writing, an XMLHttpRequest Level 2 standard is under development and

browsers are beginning to implement it. The properties, methods, and event handlers listed

below include XMLHttpRequest Level 2 features, which may not yet be implemented by all

browsers. These newer features are marked “XHR2.”

Constructor

new XMLHttpRequest()

This no-argument constructor returns a new XMLHttpRequest object.

Constants

These constants define the values of the

readyState

property. Prior to XHR2, these constants

are not widely defined, and most code uses integer literals rather than these symbolic values.

unsigned short UNSENT = 0

This is the initial state. The XMLHttpRequest object has just been created or has been

reset with the

abort()

method.

unsigned short OPENED = 1

The

open()

method has been called, but

send()

has not. The request has not yet been sent.

unsigned short HEADERS_RECEIVED = 2

The

send()

method has been called, and the response headers have been received, but

the response body has not yet been received.

unsigned short LOADING = 3

The response body is being received but is not complete.

XMLHttpRequest

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Client-Side

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unsigned short DONE = 4

The HTTP response has been fully received or has stopped because of an error.

Properties

readonly unsigned short readyState

The state of the HTTP request and the server’s response. The value of this property begins

at 0 when an XMLHttpRequest is first created and increases to 4 when the complete

HTTP response has been received. The constants listed above define the possible values.

The value of

readyState

never decreases, unless

abort()

open()

is called on a request

that is already in progress.

In theory, a

readystatechange

event is dispatched every time the value of this property

changes. In practice, however, an event is only really guaranteed when

readyState

changes to 4. (The XHR2 progress events provide a more reliable way of tracking the

progress of a request.)

readonly any response

In XHR2, this property holds the server’s response. Its type depends on the

response

Type

property. If

responseType

is the empty string or “text”, property will hold the re-

sponse body as a string. If

responseType

is “document”, this property will be a parsed

representation of the response body as an XML or HTTP

Document

. If

responseType

“arraybuffer”, this property will be an

ArrayBuffer

that represents the bytes of the re-

sponse body. And if

responseType

is “blob”, this property will be a

Blob

that represents

the bytes of the response body.

readonly string responseText

readyState

is less than 3, this property is the empty string. When

readyState

is 3, this

property returns whatever portion of the response has been received so far. If

ready

State

is 4, this property holds the complete body of the response.

If the response includes headers that specify a character encoding for the body, that

encoding is used. Otherwise, the Unicode UTF-8 encoding is assumed.

string responseType

In XHR2, this property specifies the desired response type and determines the type of the

response

property. The legal values are “text”, “document”, “arraybuffer”, and “blob”.

The default is the empty string, which is a synonym for “text”. If you set this property,

the

responseText

and

responseXML

properties will raise exceptions and you must use the

XHR2

response

property to get the server’s response.

readonly Document responseXML

The response to the request, parsed as an XML or HTML Document object, or null if the

response body is not ready or is not a valid XML or HTML document.

readonly unsigned short status

The HTTP status code returned by the server, such as 200 for success, 404 for “Not

Found” errors, or 0 if the server has not set a status code yet.

XMLHttpRequest

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readonly string statusText

This property specifies the HTTP status code of the request by name rather than by

number. That is, it is “OK” when

status

is 200 and “Not Found” when

status

is 404.

This property is the empty string if the server has not set a status code yet.

unsigned long timeout

This XHR2 property specifies a timeout value in milliseconds. If the HTTP request takes

longer than this to complete, it will be aborted and timeout event will be triggered. You

can only set this property after calling

open()

and before calling

send()

readonly XMLHttpRequestUpload upload

This XHR2 property refers to an

XMLHttpRequestUpload

object that defines a set of event

handler registration properties for monitoring the progress of the HTTP request body

upload.

boolean withCredentials

This XHR2 property specifies whether authentication credentials should be included in

CORS requests and whether cookie headers in CORS responses should be processed.

The default value is

false

Methods

void abort()

This method resets the XMLHttpRequest object to a

readyState

of 0 and aborts any pending

network activity. You might call this method, for example, if a request has taken too long,

and the response is no longer necessary.

string getAllResponseHeaders()

This method returns the HTTP response headers (with cookie and CORS headers filtered out)

sent by the server, or null if the headers have not been received yet. The headers are returned

as a single string, with one header per line.

string getResponseHeader(string header)

Returns the value of a named HTTP response

header

, or

null

if headers have not been received

yet or if the response does not include the specified

header

. Cookie and CORS-related headers

are filtered out and cannot be queried. If the response includes more than one header with

the specified name, the returned string will include the value of all of those headers, con-

catenated and separated by a comma and a space.

void open(string method, string url, [boolean async, string user, string pass])

This method resets the XMLHttpRequest object and stores its arguments for later use by the

send()

method

is the HTTP method to be used for the request. Reliably implemented values include

GET, POST, and HEAD. Implementations may also support the CONNECT, DELETE,

OPTIONS, PUT, TRACE, and TRACK methods.

url

is the URL being requested. Relative URLs are resolved in the normal way, using the URL

of the document that contains the script. The same-origin security policy (see §13.6.2)

XMLHttpRequest

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Client-Side

JavaScript

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requires that this URL have the same hostname and port as the document that contains the

script making the request. XHR2 allows cross-origin requests to servers that support CORS.

If the

async

argument is specified and is

false

, the request is performed synchronously and

the

send()

method will block until the response is complete. This is not recommended except

when XMLHttpRequest is used in a

Worker

The optional

user

and

pass

arguments specify a username and password to use with the HTTP

request.

void overrideMimeType(string mime)

This method specifies that the server’s response should be interpreted according to the speci-

fied

mime

type (and charset parameter, if that is included) instead of using the

Content-Type

header of the response.

void send(any body)

This method causes an HTTP request to be issued. If there has been no previous call to

open()

, or, more generally, if

readyState

is not 1,

send()

throws an exception. Otherwise, it

issues an HTTP request that consists of:

• The HTTP method, URL, and authorization credentials (if any) specified in the previous

call to

open()

• The request headers, if any, specified by previous calls to

setRequestHeader()

• The

body

argument passed to this method. The

body

may be a string or a Document object

that specifies the request body, or may be omitted or

null

if the request has no body (such

as GET requests that never have a body). In XHR2, the body may also be an

ArrayBuff-

, a

Blob

, or a

FormData

object.

If the

async

argument to the previous call to

open()

was

false

, this method blocks and does

not return until

readyState

is 4 and the server’s response has been fully received. Otherwise,

send()

returns immediately, and the server’s response is processed asynchronously with no-

tifications provided through event handlers.

void setRequestHeader(string name, string value)

setRequestHeader()

specifies an HTTP request header

name

and

value

that should be included

in the request issued by a subsequent call to

send()

. This method may be called only when

readyState

is 1—i.e., after a call to

open()

, but before a call to

send()

If a header with the specified

name

has already been specified, the new value for that header

is the previously specified value, plus a comma, a space, and the

value

specified in this call.

If the call to

open()

specifies authorization credentials, XMLHttpRequest automatically sends

an appropriate

Authorization

request header. You can also append to this header yourself

with

setRequestHeader()

, however.

XMLHttpRequest automatically sets “Content-Length”, “Date”, “Referer”, and “User-

Agent” and does not allow you to spoof them. There are a number of other headers, including

cookie-related headers, that you cannot set with this method. The complete list is in §18.1.

XMLHttpRequest

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Event Handlers

The original XMLHttpRequest object defined only a single event handler property:

onreadystatechange

. XHR2 expands the list with a set of progress event handlers that are much

easier to use. You can register handlers by setting these properties or by using the methods

EventTarget

. XMLHttpRequest events are always dispatched on the XMLHttpRequest ob-

ject itself. They do not bubble and have no default action to cancel. readystatechange events

have an associated Event object, and all of the other event types have an associated

ProgressEvent object.

See the

upload

property and

XMLHttpRequestUpload

for a list of events you can use to monitor

the progress of HTTP uploads.

onabort

Triggered when a request is aborted.

onerror

Triggered if the request fails with an error. Note that HTTP status codes such as 404 do

not constitute an error since the response still completes successfully. A DNS failure while

trying to resolve the URL or an infinite loop of redirects would both cause this event to

occur, however.

onload

Triggered when the request completes successfully.

onloadend

Triggered when the request has succeeded or failed after the load, abort, error, or timeout

event.

onloadstart

Triggered when the request starts.

onprogress

Triggered repeatedly (approximately every 50ms) while the response body is

downloading.

onreadystatechange

Triggered when the

readyState

property changes, most importantly when the response

is complete.

ontimeout

Triggered if the time specified by the

timeout

property has elapsed and the response is

not complete.

XMLHttpRequestUpload

EventTarget

An XMLHttpRequestUpload object defines a set of event handler registration properties for

monitoring the progress of an HTTP request body upload. In browsers that implement the

XMLHttpRequest Level 2 specification, each XMLHttpRequest object has an

upload

property

that refers to an object of this type. To monitor the progress of the request upload, simply set

XMLHttpRequestUpload

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Client-Side

JavaScript

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these properties to appropriate event handler functions or call the

EventTarget

methods. Note

that the upload progress event handlers defined here are exactly the same as the download

progress event handlers defined on XMLHttpRequest itself, except that there is no

onreadystatechange

property on this object.

Event Handlers

onabort

Triggered if the upload is aborted.

onerror

Triggered if the upload fails with a network error.

onload

Triggered when the upload succeeds

onloadend

Triggered when the upload finishes, whether successfully or not. A loadend event will

always follow a load, abort, error, or timeout event.

onloadstart

Triggered when the upload starts.

onprogress

Triggered repeatedly (approximately every 50ms) while the upload is occurring.

ontimeout

Triggered if the upload is aborted because the XMLHttpRequest

timeout

expired.

XMLHttpRequestUpload

1018 | Client-Side JavaScript Reference

Index

Symbols

3D graphics for <canvas> element, 631, 688

& (ampersand)

&& (logical AND) operator, 41, 62, 75

short-circuiting behavior of, 123

&= (bitwise AND and assignment)

operator, 62, 78

bitwise AND operator, 62, 69

< > (angle brackets)

< (less than) operator, 62, 73

substituting compareTo ( ) method, 223

<< (bitwise left shift) operator, 62, 70

<<= (bitwise left shift and assignment)

operator, 62, 78

<= (less than or equal to) operator, 62, 73

substituting compareTo( ) method, 223

> (greater than) operator, 62, 73

substituting compareTo( ) method, 223

>= (greater than or equal to) operator, 62,

substituting compareTo( ) method, 223

>> (bitwise right shift with sign extension)

operator, 62, 70

>>= (bitwise right shift with sign extension

and assignment) operator, 62, 78

>>> (bitwise right shift with zero fill)

operator, 62, 70

>>>= (bitwise right shift with zero fill and

assignment) operator, 62, 78

* (asterisk)

*= (multiplication and assignment)

operator, 62, 78

matching zero or more occurrences in

regular expressions, 254

multiplication operator, 33, 62

wildcard character in E4X, 285

@ (at sign)

@if, @else, and @end keywords in

conditional comments, 331

in attribute names, 285

\ (backslash)

breaking multiline string literals, 37

escape sequences in string literals, 37

escaping special characters in regular

expressions, 253

^ (caret)

beginning-of-string matching in regular

expressions, 258

bitwise XOR operator, 62, 70

negating character classes in regular

expressions, 253

^= (bitwise XOR and assignment) operator,

62, 78

, (comma) operator, 85

{ } (curly braces)

around function body, omitting in

shorthand functions, 282

enclosing object initializer expressions, 59

enclosing statement blocks, 88

escape characters in XML literal syntax of

E4X, 284

in function definitions, 164

initializer expressions in, 5

$ (dollar sign)

$$( ) method, ConsoleCommandLine, 884

$( ) function, 11, 524, 525–528

looking up elements by ID, 352

using instead of querySelectorAll( ), 529

$( ) method, ConsoleCommandLine, 884

We’d like to hear your suggestions for improving our indexes. Send email to index@oreilly.com.

1019

$0 and $1 properties,

ConsoleCommandLine, 884

$1, $2 … $n variables in regular expressions,

260

end-of-string matching in regular

expressions, 252, 258

. (dot)

. . (descendant) operator, 285

dot operator, 5

property access in method invocations,

168

property access with, secure subsets and,

268

querying and setting properties, 120

matching any character except newlines in

regular expressions, 254

in property access expressions, 60

= (equals sign)

== (equality) operator, 62, 71

NaN values and, 34

object-to-primitive conversions, 51

substituting compareTo( ) method, 223

== and === operators

comparing null and undefined values,

comparing primitive values and wrapper

objects, 44

type conversions and equality, 47

=== (strict equality) operator, 62, 71

=? in URL or data string passed to

jQuery.getJSON( ), 563

assignment operator, 62

! (exclamation mark)

!= (inequality) operator, 62, 71

NaN comparisons, 34

substituting compareTo( ) method, 223

!== (strict inequality) operator, 62, 71

comparing variable to null, 40

testing for undefined properties, 125

logical NOT operator, 48, 62, 77

- (minus sign)

-- (decrement) operator, 62, 69

line breaks in statements and, 27

side effects, 64, 88

-= (subtraction and assignment) operator,

-Infinity (negative infinity), 33

negation operator, 62

statements beginning with, 26

subtraction operator, 33, 62

unary minus operator, 68

( ) (parentheses)

enclosing expressions in if statements, 92

grouping in regular expressions, 256

in function and method invocations, 61

in function definitions, 59, 164

in generator expressions, 282

in object creation expressions, 61

statements beginning with (, 26

% (percent sign)

%= (modulus and assignment) operator, 62,

modulus operator, 33, 62

. (period) (see . (dot))

+ (plus sign)

++ (increment) operator, 62, 68

line breaks in statements and, 27

side effects, 64, 88

+= (addition and assignment) operator, 62,

appending text to innerHTML property,

379

addition and string concatenation

operators, 67

object-to-primitive conversions, 51

addition operator, 33, 62

matching one or more occurrences in regular

expressions, 254

statements beginning with, 26

string concatenation operator, 62

unary plus operator, 68

? (question mark)

?! (negative lookahead assertion) in regular

expressions, 258

?: (conditional) operator, 62, 82

?= (positive lookahead assertions) in regular

expressions, 258

nongreedy repetition in regular expressions,

255

" " (quotation marks, double) enclosing string

literals, 36

quoting in stylesheet or style attribute

strings, 432

' ' (quotation marks, single) enclosing string

literals, 36

single-quoted HTML attribute, JavaScript

code in, 317

; (semicolon)

1020 | Index

ending statements, 6, 87

optional, ending statements, 25

placing outside of style attribute or

stylesheet strings, 432

separating name-value pairs in style

properties, 414

statement blocks and, 89

/ (slash)

/* */ comments in javascript: URL code,

315

/*@cc_on and @*/in conditional

comments, 331

// and /” */ in comments, 23

// in comments, 4

/= (division and assignment) operator, 62,

division operator, 33, 62

enclosing regular expression literals, 251

statements beginning with, 26

[ ] (square brackets)

accessing array elements, 143

accessing individual string characters, 160

accessing values in multidimensional arrays,

148

array operator, 5, 688

accessing individual string characters,

creating arrays, 141

enclosing array comprehensions, 281

enclosing array initializers, 58

enclosing character classes in regular

expressions, 253

in property access expressions, 60, 168

restriction in secure subsets, 268

querying and setting properties, 120, 121

statements beginning with [, 26

~ (tilde), bitwise NOT operator, 62, 70

_ (underscore), in function names, 165

| (vertical bar)

alternation in regular expression pattern

matching, 256

bitwise OR operator, 62, 70

|= (bitwise OR and assignment) operator,

62, 78

|| (logical OR) operator, 62, 76, 171

<a> elements

having name attribute rather than href

attribute, 367

href attribute, 315, 367

abort( ) method

FileReader object, 925

XMLHttpRequest object, 507, 510

about:blank URL, 354

abs( ) function, Math object, 791

absolute positioning of elements, 420

abstract classes, 228

class hierarchies and, 234–238

abstract methods, 228

accept property, Input object, 942

acceptCharset property, Form object, 928

Access-Control-Allow-Origin response header,

335

accessibility, 332

accessor properties, 129, 815

adding to existing objects, 131

defining using object literal syntax, 129

inheritance and, 123

legacy API for, 134

property descriptor, 131

uses of, 130

accuracy property, Geocoordinates, 933

acos( ) function, Math object, 791

action property, Form object, 399, 928

activeElement property, Document, 892

ActiveX controls, scripting, 336

add( ) method

DOMTokenList object, 438, 902

HTMLOptionsCollection object, 938

jQuery, 580

Select element, 987

addClass( ) method, jQuery, 532

addColorStop( ), CanvasGradient object, 647,

866

addElement( ), DataTransfer object, 476, 889

addEventListener( ) method, 321, 457

capturing event handlers, 463

EventTarget object, 922

incompatibilities between attachEvent( )

and, 328

not implemented by Internet Explorer, 325

registering event handlers, 458

Worker object, 681

WorkerGlobalScope object, 683

adoptNode( ) method, Document object, 894

ADsafe security subset, 268

Index | 1021

affine transforms, 640

after( ) method, jQuery, 538

Ajax

defined, 491

functions in jQuery, 958

in jQuery 1.5, 565

transport mechanisms for, 492

utilities in jQuery, 559–571

ajax( ) function, 564–569

data types, 563

get( ) and post( ) functions, 563

getJSON( ) function, 561

getScript( ) function, 561

load( ) method, 559

passing data to, 562

XML with, 493

ajax( ) function, 564–569

callbacks, 567

common options, 565

uncommon options and hooks, 568

ajaxSetup( ) function, 565

alert( ) method, Window object, 308, 348,

1004

alpha values

specifying in canvas, 645

transparency of a color, 427

altitude property, Geocoordinates object, 933

altitudeAccuracy, Geocoordinates object, 933

altKey property, 467, 485

Event object, 915

mouse events, 451

anchors (regular expression), 258

anchors property, HTMLDocument, 367

andSelf( ) method, jQuery, 582

angles, specifying in radians in canvas, 627,

638

animate( ) method, jQuery, 551, 552

animation options object, 555

animation properties object, 554

custom animations with, 553

animations

client-side libraries supporting, 435

creating using inline scripting of CSS, 433–

435

creating using jQuery, 551–558

canceling, delaying, and queuing effects,

557

custom animations, 553–557

simple effects, 552

CSS Transitions and Animations, 419

jQuery methods for, 956

API-specific events, 449

apostrophes, 37

(see also ‘ ’ (quotation marks, single), under

Symbols)

escaping in single-quoted strings, 37

append( ) method

BlobBuilder object, 695, 864

FormData object, 932

jQuery, 538

appendChild( ), Node object, 383, 977

appendData( ) method

Comment node, 881

Text node, 993

appendTo( ) method, jQuery, 538

Apple iPhone and iPad devices, gesture and

touch events, 456

<applet> elements, 537

application cache, 601–607

creating application manifest file, 601

status property values, 606

updates, 603–607

ApplicationCache object, 859

constants, values for status property, 859

event handlers, 860

status property, 606

swapCache( ) method, 860

update( ) method, 860

applicationCache property, Window object,

604, 1002

apply( ) and call( ), Function object, 170, 187

restrictions in secure subsets, 267

apply( ) method, Function object, 776

appName property

Navigator object, 347, 974

WorkerNavigator object, 1012

appVersion property

Navigator object, 347, 974

WorkerNavigator object, 1012

arc( ), CanvasRenderingContext2D, 631, 643,

873

arcTo( ), CanvasRenderingContext2D, 643,

873

arguments (function), 171

object properties as, 174

variable-length argument lists, 172

Arguments object, 172, 720

callee and caller properties, 173

1022 | Index

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