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TheactiveElementattribute onDocumentp103

objects must return the value returned by the following steps:

1. Letcandidatebe theDocumentp103

on which the method was invoked.

2. Ifcandidatehas adialog groupp713

with a designatedfocused dialog of the dialog groupp713

, then letcandidatebe the designated

focused dialog of the dialog groupp713

, and redo this step.

3. Ifcandidatehas a non-emptycontrol groupp712

, letcandidatebe the designatedfocused area of the control groupp713

4. Ifcandidateis afocusable areap711

, letcandidatebecandidate'sDOM anchorp712

5. Ifcandidateis aDocumentp103

that has abody elementp108

, then letcandidatebethe body elementp108

of thatDocumentp103

Otherwise, ifcandidateis aDocumentp103

with a non-nulldocument element

, then letcandidatebe thatdocument element

Otherwise, ifcandidateis aDocumentp103

, then letcandidatebe null.

6. Returncandidate.

ThehasFocus()method on theDocumentp103

object, when invoked, must return the result of running thehas focus stepsp719

with the

Documentp103

object as the argument.

Thefocus()method on theWindowp758

object, when invoked, must run thefocusing stepsp715

with theWindowp758

object'sbrowsing contextp748

Additionally, if thisbrowsing contextp748

is atop-level browsing contextp749

, user agents are encouraged to trigger some sort of notification to

indicate to the user that the page is attempting to gain focus.

document.activeElementp721

Returns the deepest element in the document through which or to which key events are being routed. This is, roughly speaking, the

focused element in the document.

For the purposes of this API, when achild browsing contextp749

is focused, itsbrowsing context containerp749

isfocusedp712

in theparent

browsing contextp749

. For example, if the user moves the focus to a text field in aniframep308

, theiframep308

is the element returned

by theactiveElementp721

API in theiframep308

'snode document

document.hasFocusp721()

Returns true if key events are being routed through or to the document; otherwise, returns false. Roughly speaking, this corresponds to

the document, or a document nested inside this one, being focused.

window.focusp721()

Moves the focus to the window'sbrowsing contextp748

, if any.

element.focusp722()

Moves the focus to the element.

If the element is abrowsing context containerp749

, moves the focus to thenested browsing contextp749

instead.

element.blurp722()

Moves the focus to theviewport

. Use of this method is discouraged; if you want to focus theviewport

, call thefocus()p722

method on

theDocumentp103

'sdocument element

Do not use this method to hide the focus ring if you find the focus ring unsightly. Instead, use a CSS rule to override the'outline'

property, and provide a different way to show what element is focused. Be aware that if an alternative focusing style isn't made available,

the page will be significantly less usable for people who primarily navigate pages using a keyboard, or those with reduced vision who

use focus outlines to help them navigate the page.

For example, to hide the outline from links and instead use a yellow background to indicate focus, you could use:

:link:focus, :visited:focus { outline: none; background: yellow; color: black; }

Example

Note

6.4.6 Focus management APIs

721

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Theblur()method on theWindowp758

object, when invoked, provides a hint to the user agent that the script believes the user probably is not

currently interested in the contents of thebrowsing contextp748

of theWindowp758

object on which the method was invoked, but that the contents

might become interesting again in the future.

User agents are encouraged to ignore calls to thisblur()p722

method entirely.

Thefocus()method on elements, when invoked, must run the following algorithm:

1. If the element is marked aslocked for focusp722

, then abort these steps.

2. Mark the element aslocked for focus.

3. Run thefocusing stepsp715

for the element.

4. Unmark the element aslocked for focusp722

Theblur()method, when invoked, should run theunfocusing stepsp716

for the element on which the method was called. User agents may

selectively or uniformly ignore calls to this method for usability reasons.

6.5 Assigning keyboard shortcuts

This section is non-normative.

Each element that can be activated or focused can be assigned a single key combination to activate it, using theaccesskeyp723

attribute.

The exact shortcut is determined by the user agent, based on information about the user's keyboard, what keyboard shortcuts already exist on the

platform, and what other shortcuts have been specified on the page, using the information provided in theaccesskeyp723

attribute as a guide.

In order to ensure that a relevant keyboard shortcut is available on a wide variety of input devices, the author can provide a number of alternatives

in theaccesskeyp723

attribute.

Each alternative consists of a single character, such as a letter or digit.

User agents can provide users with a list of the keyboard shortcuts, but authors are encouraged to do so also. TheaccessKeyLabelp724

IDL

attribute returns a string representing the actual key combination assigned by the user agent.

Historically, thefocus()p722

andblur()p722

methods actually affected the system-level focus of the system widget (e.g. tab or window)

that contained thebrowsing contextp748

, but hostile sites widely abuse this behaviour to the user's detriment.

Note

For example, if theblur()p722

method is unwisely being used to remove the focus ring for aesthetics reasons, the page would become

unusable by keyboard users. Ignoring calls to this method would thus allow keyboard users to interact with the page.

Example

In this example, an author has provided a button that can be invoked using a shortcut key. To support full keyboards, the author has

provided "C" as a possible key. To support devices equipped only with numeric keypads, the author has provided "1" as another possibly

key.

<input type=button value=Collect onclick="collect()"

accesskey="C 1" id=c>

Example

To tell the user what the shortcut key is, the author has this script here opted to explicitly add the key combination to the button's label:

function addShortcutKeyLabel(button) {

if (button.accessKeyLabel != '')

button.value += ' (' + button.accessKeyLabel + ')';

}

addShortcutKeyLabel(document.getElementById('c'));

Example

6.5.1 Introduction

722

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AllHTML elementsp43

may have theaccesskeyp723

content attribute set. Theaccesskeyp723

attribute's value is used by the user agent as a

guide for creating a keyboard shortcut that activates or focuses the element.

If specified, the value must be anordered set of unique space-separated tokensp84

that arecase-sensitivep63

, each of which must be exactly one

Unicode code point in length.

Browsers on different platforms will show different labels, even for the same key combination, based on the convention prevalent on that

platform. For example, if the key combination is the Control key, the Shift key, and the letter C, a Windows browser might display

"Ctrl+Shift+C", whereas a Mac browser might display "^⇧C", while an Emacs browser might just display "C-C". Similarly, if the key

combination is the Alt key and the Escape key, Windows might use "Alt+Esc", Mac might use "⌥⎋", and an Emacs browser might use

"M-ESC" or "ESC ESC".

In general, therefore, it is unwise to attempt to parse the value returned from theaccessKeyLabelp724

IDL attribute.

In the following example, a variety of links are given with access keys so that keyboard users familiar with the site can more quickly

navigate to the relevant pages:

<nav>

<p>

<a title="Consortium Activities" accesskey="A" href="/Consortium/activities">Activities</a> |

<a title="Technical Reports and Recommendations" accesskey="T" href="/TR/">Technical

Reports</a> |

<a title="Alphabetical Site Index" accesskey="S" href="/Consortium/siteindex">Site Index</a> |

<a title="About This Site" accesskey="B" href="/Consortium/">About Consortium</a> |

<a title="Contact Consortium" accesskey="C" href="/Consortium/contact">Contact</a>

</p>

</nav>

Example

In the following example, the search field is given two possible access keys, "s" and "0" (in that order). A user agent on a device with a

full keyboard might pickCtrl+Alt+Sas the shortcut key, while a user agent on a small device with just a numeric keypad might pick

just the plain unadorned key0:

<label>Search: <input type="search" name="q" accesskey="s 0"></label>

</form>

Example

In the following example, a button has possible access keys described. A script then tries to update the button's label to advertise the

key combination the user agent selected.

...

function labelButton(button) {

if (button.accessKeyLabel)

button.value += ' (' + button.accessKeyLabel + ')';

}

var inputs = document.getElementsByTagName('input');

for (var i = 0; i < inputs.length; i += 1) {

if (inputs[i].type == "submit")

labelButton(inputs[i]);

}

</script>

Example

6.5.2 Theaccesskeyattribute

723

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An element'sassigned access keyis a key combination derived from the element'saccesskeyp723

content attribute. Initially, an element must not

have anassigned access keyp724

Whenever an element'saccesskeyp723

attribute is set, changed, or removed, the user agent must update the element'sassigned access keyp724

by running the following steps:

1. If the element has noaccesskeyp723

attribute, then skip to thefallbackstep below.

2. Otherwise,split the attribute's value on spacesp84

, and letkeysbe the resulting tokens.

3. For each value inkeysin turn, in the order the tokens appeared in the attribute's value, run the following substeps:

1. If the value is not a string exactly one Unicode code point in length, then skip the remainder of these steps for this value.

2. If the value does not correspond to a key on the system's keyboard, then skip the remainder of these steps for this value.

3. If the user agent can find a mix of zero or more modifier keys that, combined with the key that corresponds to the value given

in the attribute, can be used as the access key, then the user agent may assign that combination of keys as the element's

assigned access keyp724

and abort these steps.

4. Fallback: Optionally, the user agent may assign a key combination of its choosing as the element'sassigned access keyp724

and then

abort these steps.

5. If this step is reached, the element has noassigned access keyp724

Once a user agent has selected and assigned an access key for an element, the user agent should not change the element'sassigned access

keyp724

unless theaccesskeyp723

content attribute is changed or the element is moved to anotherDocumentp103

When the user presses the key combination corresponding to theassigned access keyp724

for an element, if the elementdefines a commandp556

the command'sHidden Statep556

facet is false (visible), the command'sDisabled Statep556

facet is also false (enabled), the element isin a

Document

that has abrowsing contextp748

, and neither the element nor any of its ancestors has ahiddenp708

attribute specified, then the user

agent must trigger theActionp556

of the command.

TheaccessKeyIDL attribute mustreflectp89

theaccesskeyp723

content attribute.

TheaccessKeyLabelIDL attribute must return a string that represents the element'sassigned access keyp724

, if any. If the element does not have

one, then the IDL attribute must return the empty string.

6.6 Editing

[NoInterfaceObject]

interface ElementContentEditable {

[CEReactions

] attribute DOMString contentEditable

;

readonly attribute boolean isContentEditable

;

};

On one user agent, the button's label might become "Compose (⌘N)". On another, it might become "Compose (Alt+⇧+1)". If the

user agent doesn't assign a key, it will be just "Compose". The exact string depends on what theassigned access keyp724

is, and on how

the user agent represents that key combination.

User agentsmight exposep556

elements that have anaccesskeyp723

attribute in other ways as well, e.g. in a menu displayed in response

to a specific key combination.

Note

IDL

6.5.3Processing model

6.6.1 Making document regions editable: Thecontenteditablep725

content attribute

p30

Support:

Chrome

Chrome for Android

50+

UC Browser for Android 9.9+

iOS Safari

5.0-5.1+

Firefox

3.5+

5.5+

Opera Mini

None

Android Browser

Edge

12+

Safari

3.1+

Opera

IE Mobile

10+

Source:caniuse.com

⋰

724

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Thecontenteditablecontent attribute is anenumerated attributep65

whose keywords are the empty string,true, andfalse. The empty string

and thetruekeyword map to thetruestate. Thefalsekeyword maps to thefalsestate. In addition, there is a third state, theinheritstate, which is

themissing value defaultp65

(and theinvalid value defaultp65

Thetruestate indicates that the element is editable. Theinheritstate indicates that the element is editable if its parent is. Thefalsestate indicates

that the element is not editable.

For example, consider a page that has aformp429

and atextareap489

to publish a new article, where the user is expected to write the

article using HTML:

<legend>New article</legend>

<textarea name=article><p>Hello world.</p></textarea>

</fieldset>

<p><button>Publish</button></p>

</form>

When scripting is enabled, thetextareap489

element could be replaced with a rich text field instead, using thecontenteditablep725

attribute:

<legend>New article</legend>

<textarea id=textarea name=article><p>Hello world.</p></textarea>

<div id=div style="white-space: pre-wrap" hidden><p>Hello world.</p></div>

let textarea = document.getElementById("textarea");

let div = document.getElementById("div");

textarea.hidden = true;

div.hidden = false;

div.contentEditable = "true";

div.oninput = (e) => {

textarea.value = div.innerHTML;

};

</script>

</fieldset>

<p><button>Publish</button></p>

</form>

Features to enable, e.g., inserting links, can be implemented using thedocument.execCommand()p727

API, or usingSelection

APIs

and other DOM APIs.[EDITING]p1160

[SELECTION]p1163

[DOM]p1160

Example

Thecontenteditablep725

attribute can also be used to great effect:

<!doctype html>

<title>Live CSS editing!</title>

html { margin:.2em; font-size:2em; color:lime; background:purple }

head, title, style { display:block }

body { display:none }

</style>

Example

element.contentEditablep726 [ =value]

Returns "true", "false", or "inherit", based on the state of thecontenteditablep725

attribute.

Note

725

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ThecontentEditableIDL attribute, on getting, must return the string "true" if the content attribute is set to the true state, "false" if the content

attribute is set to the false state, and "inherit" otherwise. On setting, if the new value is anASCII case-insensitivep63

match for the string

"inherit" then the content attribute must be removed, if the new value is anASCII case-insensitivep63

match for the string "true" then the content

attribute must be set to the string "true", if the new value is anASCII case-insensitivep63

match for the string "false" then the content attribute

must be set to the string "false", and otherwise the attribute setter must throw a"SyntaxError"

DOMException

TheisContentEditableIDL attribute, on getting, must return true if the element is either anediting hostp727

oreditablep727

, and false otherwise.

Documents have adesignMode, which can be either enabled or disabled.

ThedesignModep726

IDL attribute on theDocumentp103

object takes two values, "on" and "off". On setting, the new value must be compared in

anASCII case-insensitivep63

manner to these two values; if it matches the "on" value, thendesignModep726

must be enabled, and if it matches the

"off" value, thendesignModep726

must be disabled. Other values must be ignored.

On getting, ifdesignModep726

is enabled, the IDL attribute must return the value "on"; otherwise it is disabled, and the attribute must return the

value "off".

The last state set must persist until the document is destroyed or the state is changed. Initially, documents must have theirdesignModep726

disabled.

When thedesignModep726

changes from being disabled to being enabled, the user agent mustimmediatelyp42

reset the document'sactive

rangep727

's start and end boundary points to be at the start of theDocumentp103

and then run thefocusing stepsp715

for thedocument element

of the

Documentp103

, if non-null.

Authors are encouraged to set the'white-space'

property onediting hostsp727

and on markup that was originally created through these editing

mechanisms to the value 'pre-wrap'. Default HTML whitespace handling is not well suited to WYSIWYG editing, and line wrapping will not work

correctly in some corner cases if'white-space'

is left at its default value.

Can be set, to change that state.

Throws a"SyntaxError"

DOMException

if the new value isn't one of those strings.

element.isContentEditablep726

Returns true if the element is editable; otherwise, returns false.

document.designModep726 [ =value]

Returns "on" if the document is editable, and "off" if it isn't.

Can be set, to change the document's current state. This focuses the document and resets the selection in that document.

Note

As an example of problems that occur if the default 'normal' value is used instead, consider the case of the user typing

"yellow␣␣ball", with two spaces (here represented by "␣") between the words. With the editing rules in place for the default value of

'white-space'

('normal'), the resulting markup will either consist of "yellow  ball" or "yellow  ball"; i.e., there will be

a non-breaking space between the two words in addition to the regular space. This is necessary because the 'normal' value for'white-

space'

requires adjacent regular spaces to be collapsed together.

Example

6.6.2 Making entire documents editable: ThedesignModep726

IDL attribute

6.6.3 Best practices for in-page editors

726

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The definition of the termsactive range,editing host, andeditable, the user interface requirements of elements that areediting hostsp727

editablep727

, theexecCommand(),queryCommandEnabled(),queryCommandIndeterm(),queryCommandState(),

queryCommandSupported(), and queryCommandValue()methods, text selections, and thedelete the selectionalgorithm are defined in the

HTML Editing APIs specification.[EDITING]p1160

User agents can support the checking of spelling and grammar of editable text, either in form controls (such as the value oftextareap489

elements), or in elements in anediting hostp727

(e.g. usingcontenteditablep725

For each element, user agents must establish adefault behaviour, either through defaults or through preferences expressed by the user. There

are three possible default behaviours for each element:

true-by-default

The element will be checked for spelling and grammar if its contents are editable and spellchecking is not explicitly disabled through the

spellcheckp727

attribute.

false-by-default

The element will never be checked for spelling and grammar unless spellchecking is explicitly enabled through thespellcheckp727

attribute.

inherit-by-default

The element's default behaviour is the same as its parent element's. Elements that have no parent element cannot have this as their default

behaviour.

Thespellcheckattribute is anenumerated attributep65

whose keywords are the empty string,trueandfalse. The empty string and thetrue

keyword map to thetruestate. Thefalsekeyword maps to thefalsestate. In addition, there is a third state, thedefaultstate, which is themissing

value defaultp65

(and theinvalid value defaultp65

ThespellcheckIDL attribute, on getting, must return true if the element'sspellcheckp727

content attribute is in thetruestate, or if the element's

spellcheckp727

content attribute is in thedefaultstate and the element'sdefault behaviourp727

istrue-by-defaultp727

, or if the element's

In the former case, "yellow⍽" might wrap to the next line ("⍽" being used here to represent a non-breaking space) even though

"yellow" alone might fit at the end of the line; in the latter case, "⍽ball", if wrapped to the start of the line, would have visible

indentation from the non-breaking space.

When'white-space'

is set to 'pre-wrap', however, the editing rules will instead simply put two regular spaces between the words, and

should the two words be split at the end of a line, the spaces would be neatly removed from the rendering.

Thetruestate indicates that the element is to have its spelling and grammar checked. Thedefaultstate indicates that the element is to act

according to a default behaviour, possibly based on the parent element's ownspellcheckp727

state, as defined below. Thefalsestate

indicates that the element is not to be checked.

Note

element.spellcheckp727 [ =value]

Returns true if the element is to have its spelling and grammar checked; otherwise, returns false.

Can be set, to override the default and set thespellcheckp727

content attribute.

element.forceSpellCheckp728()

Forces the user agent to report spelling and grammar errors on the element (if checking is enabled), even if the user has never focused

the element. (If the method is not invoked, user agents can hide errors in text that wasn't just entered by the user.)

Note

6.6.4 Editing APIs

6.6.5 Spelling and grammar checking

Support:

Chrome

Chrome for Android

(limited)

50+

UC Browser for Android

(limited)

9.9+

iOS Safari(limited)

3.2+

Firefox

10+

Opera Mini(limited) 5.0-8.0+

Android Browser

(limited)

2.1+

Edge

12+

Safari

5.1+

Opera

10.5+

IE Mobile(limited)

10+

Source:caniuse.com

⋰

727

spellcheckp727

content attribute is in thedefaultstate and the element'sdefault behaviourp727

isinherit-by-defaultp727

and the element's parent

element'sspellcheckp727

IDL attribute would return true; otherwise, if none of those conditions applies, then the attribute must instead return

false.

On setting, if the new value is true, then the element'sspellcheckp727

content attribute must be set to the literal string "true", otherwise it must

be set to the literal string "false".

User agents must only consider the following pieces of text as checkable for the purposes of this feature:

• Thevaluep508

ofinputp434

elements whosetypep436

attributes are in theTextp440

,Searchp440

,URLp441

, orE-mailp443

states and that are

mutablep508

(i.e. that do not have thereadonlyp464

attribute specified and that are notdisabledp511

• Thevaluep508

oftextareap489

elements that do not have areadonlyp490

attribute and that are notdisabledp511

• Text inText

nodes that are children ofediting hostsp727

oreditablep727

elements.

• Text in attributes ofeditablep727

elements.

For text that is part of aText

node, the element with which the text is associated is the element that is the immediate parent of the first character of

the word, sentence, or other piece of text. For text in attributes, it is the attribute's element. For the values ofinputp434

andtextareap489

elements, it is the element itself.

To determine if a word, sentence, or other piece of text in an applicable element (as defined above) is to have spelling- and grammar-checking

enabled, the UA must use the following algorithm:

1. If the user has disabled the checking for this text, then the checking is disabled.

2. Otherwise, if the user has forced the checking for this text to always be enabled, then the checking is enabled.

3. Otherwise, if the element with which the text is associated has aspellcheckp727

content attribute, then: if that attribute is in thetrue

state, then checking is enabled; otherwise, if that attribute is in thefalsestate, then checking is disabled.

4. Otherwise, if there is an ancestor element with aspellcheckp727

content attribute that is not in thedefaultstate, then: if the nearest

such ancestor'sspellcheckp727

content attribute is in thetruestate, then checking is enabled; otherwise, checking is disabled.

5. Otherwise, if the element'sdefault behaviourp727

istrue-by-defaultp727

, then checking is enabled.

6. Otherwise, if the element'sdefault behaviourp727

isfalse-by-defaultp727

, then checking is disabled.

7. Otherwise, if the element's parent element hasitschecking enabled, then checking is enabled.

8. Otherwise, checking is disabled.

If the checking is enabled for a word/sentence/text, the user agent should indicate spelling and grammar errors in that text. User agents should take

into account the other semantics given in the document when suggesting spelling and grammar corrections. User agents may use the language of

the element to determine what spelling and grammar rules to use, or may use the user's preferred language settings. UAs should useinputp434

element attributes such aspatternp466

to ensure that the resulting value is valid, where possible.

If checking is disabled, the user agent should not indicate spelling or grammar errors for that text.

Even when checking is enabled, user agents may opt to not report spelling or grammar errors in text that the user agent deems the user has no

interest in having checked (e.g. text that was already present when the page was loaded, or that the user did not type, or text in controls that the

user has not focused, or in parts of e-mail addresses that the user agent is not confident were misspelt). TheforceSpellCheck()method, when

invoked on an element, must override this behaviour, forcing the user agent to consider all spelling and grammar errors in text in that element for

which checking is enabled to be of interest to the user.

Thespellcheckp727

IDL attribute is not affected by user preferences that override thespellcheckp727

content attribute, and therefore

might not reflect the actual spellchecking state.

Note

The element with ID "a" in the following example would be the one used to determine if the word "Hello" is checked for spelling errors. In

this example, it would not be.

Example

728

6.7Drag and drop

This section defines an event-based drag-and-drop mechanism.

This specification does not define exactly what adrag-and-drop operationactually is.

On a visual medium with a pointing device, a drag operation could be the default action of amousedown

event that is followed by a series of

mousemove

events, and the drop could be triggered by the mouse being released.

When using an input modality other than a pointing device, users would probably have to explicitly indicate their intention to perform a drag-and-

drop operation, stating what they wish to drag and where they wish to drop it, respectively.

However it is implemented, drag-and-drop operations must have a starting point (e.g. where the mouse was clicked, or the start of the selection or

element that was selected for the drag), may have any number of intermediate steps (elements that the mouse moves over during a drag, or

elements that the user picks as possible drop points as they cycle through possibilities), and must either have an end point (the element above

which the mouse button was released, or the element that was finally selected), or be canceled. The end point must be the last element selected as

a possible drop point before the drop occurs (so if the operation is not canceled, there must be at least one element in the middle step).

This section is non-normative.

To make an element draggable is simple: give the element adraggablep744

attribute, and set an event listener fordragstartp744

that stores the

data being dragged.

The event handler typically needs to check that it's not a text selection that is being dragged, and then needs to store data into the

DataTransferp732

object and set the allowed effects (copy, move, link, or some combination).

For example:

<p>What fruits do you like?</p>

<li draggable="true" data-value="fruit-apple">Apples</li>

<li draggable="true" data-value="fruit-orange">Oranges</li>

<li draggable="true" data-value="fruit-pear">Pears</li>

</ol>

var internalDNDType = 'text/x-example'; // set this to something specific to your site

function dragStartHandler(event) {

if (event.target instanceof HTMLLIElement) {

// use the element's data-value="" attribute as the value to be moving:

event.dataTransfer.setData(internalDNDType, event.target.dataset.value);

event.dataTransfer.effectAllowed = 'move'; // only allow moves

</div>

The element with ID "b" in the following example would have checking enabled (the leading space character in the attribute's value on

theinputp434

element causes the attribute to be ignored, so the ancestor's value is used instead, regardless of the default).

</p>

This specification does not define the user interface for spelling and grammar checkers. A user agent could offer on-demand checking,

could perform continuous checking while the checking is enabled, or could use other interfaces.

Note

6.7.1 Introduction

Support:

Chrome

Chrome for Android

None

UC Browser for

Android

None

iOS Safari

None

Firefox

3.5+

IE(limited)

5.5+

Opera Mini

None

Android Browser

None

Edge(limited)

12+

Safari

3.1+

Opera

12+

IE Mobile

10+

Source:caniuse.com

⋰

729

} else {

event.preventDefault(); // don't allow selection to be dragged

}

</script>

To accept a drop, the drop target has to have adropzonep745

attribute and listen to thedropp744

event.

The value of thedropzonep745

attribute specifies what kind of data to accept (e.g. "string:text/plain" to accept any text strings, or

"file:image/png" to accept a PNG image file) and what kind of feedback to give (e.g. "move" to indicate that the data will be moved).

Thedropp744

event allows the actual drop to be performed. This event needs to be canceled, so that thedropEffectp733

attribute's value can be

used by the source (otherwise it's reset).

For example:

<p>Drop your favorite fruits below:</p>

<!-- don't forget to change the "text/x-example" type to something

specific to your site -->

</ol>

var internalDNDType = 'text/x-example'; // set this to something specific to your site

function dropHandler(event) {

var li = document.createElement('li');

var data = event.dataTransfer.getData(internalDNDType);

if (data == 'fruit-apple') {

li.textContent = 'Apples';

} else if (data == 'fruit-orange') {

li.textContent = 'Oranges';

} else if (data == 'fruit-pear') {

li.textContent = 'Pears';

} else {

li.textContent = 'Unknown Fruit';

}

event.target.appendChild(li);

}

</script>

To remove the original element (the one that was dragged) from the display, thedragendp744

event can be used.

For our example here, that means updating the original markup to handle that event:

<p>What fruits do you like?</p>

...as before...

</ol>

function dragStartHandler(event) {

// ...as before...

}

function dragEndHandler(event) {

if (event.dataTransfer.dropEffect == 'move') {

// remove the dragged element

event.target.parentNode.removeChild(event.target);

}

Instead of using thedropzonep745

attribute, a drop target can handle thedragenterp744

event (to report whether or not the drop target is

to accept the drop) and thedragoverp744

event (to specify what feedback is to be shown to the user).

Note

730

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