Home/CKEditor 5/API

LinkCommand (link)

@ckeditor/ckeditor5-link/src/linkcommand

class

Hierarchy

Command
- LinkCommand

Implements

Emitter
Observable

Mixes

EmitterMixin
ObservableMixin

See source

The link command. It is used by the link feature.

Filtering

Public
Inherited
Mixed
Protected
Private
Deprecated

Properties

editor : Editor

readonly inherited

The editor on which this command will be used.

See source
isEnabled : Boolean

readonly inherited observable
Flag indicating whether a command is enabled or disabled. A disabled command will do nothing when executed.

See source
A concrete command class should control this value by overriding the refresh() method.

It is possible to disable a command from "outside". For instance, in your integration you may want to disable a certain set of commands for the time being. To do that, you can use the fact that isEnabled is observable and it fires the set:isEnabled event every time anyone tries to modify its value:
```
function disableCommand( cmd ) {
    cmd.on( 'set:isEnabled', forceDisable, { priority: 'highest' } );

    cmd.isEnabled = false;

    // Make it possible to enable the command again.
    return () => {
        cmd.off( 'set:isEnabled', forceDisable );
        cmd.refresh();
    };

    function forceDisable( evt ) {
        evt.return = false;
        evt.stop();
    }
}

// Usage:

// Disabling the command.
const enableBold = disableCommand( editor.commands.get( 'bold' ) );

// Enabling the command again.
enableBold();
```
manualDecorators : Collection

readonly

A collection of manual decorators corresponding to the decorator configuration.

See source

You can consider it a model with states of manual decorators added to the currently selected link.
value : Object | undefined

readonly observable

The value of the 'linkHref' attribute if the start of the selection is located in a node with this attribute.

See source
_disableStack : Set.<String>

private inherited

Holds identifiers for forceDisabled mechanism.

See source

Methods

constructor( editor )

inherited

Creates a new Command instance.

See source

Parameters

editor : Editor

Editor on which this command will be used.
bind( bindProperties ) → Object

mixed
Binds observable properties to other objects implementing the Observable interface.

See source
Read more in the dedicated guide covering the topic of property bindings with some additional examples.

Consider two objects: a button and an associated command (both Observable).

A simple property binding could be as follows:
```
button.bind( 'isEnabled' ).to( command, 'isEnabled' );
```
or even shorter:
```
button.bind( 'isEnabled' ).to( command );
```
which works in the following way:
- button.isEnabled instantly equals command.isEnabled,
- whenever command.isEnabled changes, button.isEnabled will immediately reflect its value.
Note: To release the binding, use unbind.

You can also "rename" the property in the binding by specifying the new name in the to() chain:
```
button.bind( 'isEnabled' ).to( command, 'isWorking' );
```
It is possible to bind more than one property at a time to shorten the code:
```
button.bind( 'isEnabled', 'value' ).to( command );
```
which corresponds to:
```
button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
```
The binding can include more than one observable, combining multiple data sources in a custom callback:
```
button.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',
    ( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );
```
It is also possible to bind to the same property in an array of observables. To bind a button to multiple commands (also Observables) so that each and every one of them must be enabled for the button to become enabled, use the following code:
```
button.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',
    ( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );
```
Parameters

bindProperties : String

Observable properties that will be bound to other observable(s).

Returns

Object

The bind chain with the to() and toMany() methods.
clearForceDisabled( id )

inherited

Clears forced disable previously set through forceDisabled. See forceDisabled.

See source

Parameters

id : String

Unique identifier, equal to the one passed in forceDisabled call.
decorate( methodName )

mixed
Turns the given methods of this object into event-based ones. This means that the new method will fire an event (named after the method) and the original action will be plugged as a listener to that event.

See source
Read more in the dedicated guide covering the topic of decorating methods with some additional examples.

Decorating the method does not change its behavior (it only adds an event), but it allows to modify it later on by listening to the method's event.

For example, to cancel the method execution the event can be stopped:
```
class Foo {
    constructor() {
        this.decorate( 'method' );
    }

    method() {
        console.log( 'called!' );
    }
}

const foo = new Foo();
foo.on( 'method', ( evt ) => {
    evt.stop();
}, { priority: 'high' } );

foo.method(); // Nothing is logged.
```
Note: The high priority listener has been used to execute this particular callback before the one which calls the original method (which uses the "normal" priority).

It is also possible to change the returned value:
```
foo.on( 'method', ( evt ) => {
    evt.return = 'Foo!';
} );

foo.method(); // -> 'Foo'
```
Finally, it is possible to access and modify the arguments the method is called with:
```
method( a, b ) {
    console.log( `${ a }, ${ b }`  );
}

// ...

foo.on( 'method', ( evt, args ) => {
    args[ 0 ] = 3;

    console.log( args[ 1 ] ); // -> 2
}, { priority: 'high' } );

foo.method( 1, 2 ); // -> '3, 2'
```
Parameters

methodName : String

Name of the method to decorate.
delegate( events ) → EmitterMixinDelegateChain

mixed
Delegates selected events to another Emitter. For instance:

See source
```
emitterA.delegate( 'eventX' ).to( emitterB );
emitterA.delegate( 'eventX', 'eventY' ).to( emitterC );
```
then eventX is delegated (fired by) emitterB and emitterC along with data:
```
emitterA.fire( 'eventX', data );
```
and eventY is delegated (fired by) emitterC along with data:
```
emitterA.fire( 'eventY', data );
```
Parameters

events : String

Event names that will be delegated to another emitter.

Returns

EmitterMixinDelegateChain
destroy()

inherited

Destroys the command.

See source
execute( href, [ manualDecoratorIds ] )
Executes the command.

See source
When the selection is non-collapsed, the linkHref attribute will be applied to nodes inside the selection, but only to those nodes where the linkHref attribute is allowed (disallowed nodes will be omitted).

When the selection is collapsed and is not inside the text with the linkHref attribute, a new text node with the linkHref attribute will be inserted in place of the caret, but only if such element is allowed in this place. The _data of the inserted text will equal the href parameter. The selection will be updated to wrap the just inserted text node.

When the selection is collapsed and inside the text with the linkHref attribute, the attribute value will be updated.

Decorators and model attribute management
There is an optional argument to this command that applies or removes model text attributes brought by manual link decorators.

Text attribute names in the model correspond to the entries in the configuration. For every decorator configured, a model text attribute exists with the "link" prefix. For example, a 'linkMyDecorator' attribute corresponds to 'myDecorator' in the configuration.

To learn more about link decorators, check out the config.link.decorators documentation.

Here is how to manage decorator attributes with the link command:
```
const linkCommand = editor.commands.get( 'link' );

// Adding a new decorator attribute.
linkCommand.execute( 'http://example.com', {
    linkIsExternal: true
} );

// Removing a decorator attribute from the selection.
linkCommand.execute( 'http://example.com', {
    linkIsExternal: false
} );

// Adding multiple decorator attributes at the same time.
linkCommand.execute( 'http://example.com', {
    linkIsExternal: true,
    linkIsDownloadable: true,
} );

// Removing and adding decorator attributes at the same time.
linkCommand.execute( 'http://example.com', {
    linkIsExternal: false,
    linkFoo: true,
    linkIsDownloadable: false,
} );
```
Note: If the decorator attribute name is not specified, its state remains untouched.

Note: UnlinkCommand#execute() removes all decorator attributes.

Parameters

href : String

Link destination.

[ manualDecoratorIds ] : Object

The information about manual decorator attributes to be applied or removed upon execution.

Defaults to {}

Fires
- execute
fire( eventOrInfo, [ args ] ) → *

mixed

Fires an event, executing all callbacks registered for it.

See source

The first parameter passed to callbacks is an EventInfo object, followed by the optional args provided in the fire() method call.

Parameters

eventOrInfo : String | EventInfo

The name of the event or EventInfo object if event is delegated.

[ args ] : *

Additional arguments to be passed to the callbacks.

Returns

*

By default the method returns undefined. However, the return value can be changed by listeners through modification of the evt.return's property (the event info is the first param of every callback).
forceDisabled( id )

inherited
Disables the command.

See source
Command may be disabled by multiple features or algorithms (at once). When disabling a command, unique id should be passed (e.g. feature name). The same identifier should be used when enabling back the command. The command becomes enabled only after all features enabled it back.

Disabling and enabling a command:
```
command.isEnabled; // -> true
command.forceDisabled( 'MyFeature' );
command.isEnabled; // -> false
command.clearForceDisabled( 'MyFeature' );
command.isEnabled; // -> true
```
Command disabled by multiple features:
```
command.forceDisabled( 'MyFeature' );
command.forceDisabled( 'OtherFeature' );
command.clearForceDisabled( 'MyFeature' );
command.isEnabled; // -> false
command.clearForceDisabled( 'OtherFeature' );
command.isEnabled; // -> true
```
Multiple disabling with the same identifier is redundant:
```
command.forceDisabled( 'MyFeature' );
command.forceDisabled( 'MyFeature' );
command.clearForceDisabled( 'MyFeature' );
command.isEnabled; // -> true
```
Note: some commands or algorithms may have more complex logic when it comes to enabling or disabling certain commands, so the command might be still disabled after clearForceDisabled was used.

Parameters

id : String

Unique identifier for disabling. Use the same id when enabling back the command.
listenTo( emitter, event, callback, [ options ] = { [options.priority] } )

mixed
Registers a callback function to be executed when an event is fired in a specific (emitter) object.

See source
Events can be grouped in namespaces using :. When namespaced event is fired, it additionally fires all callbacks for that namespace.
```
// myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).
myEmitter.on( 'myGroup', genericCallback );
myEmitter.on( 'myGroup:myEvent', specificCallback );

// genericCallback is fired.
myEmitter.fire( 'myGroup' );
// both genericCallback and specificCallback are fired.
myEmitter.fire( 'myGroup:myEvent' );
// genericCallback is fired even though there are no callbacks for "foo".
myEmitter.fire( 'myGroup:foo' );
```
An event callback can stop the event and set the return value of the fire method.

Parameters

emitter : Emitter

The object that fires the event.

event : String

The name of the event.

callback : function

The function to be called on event.

[ options ] : Object

Additional options.

Properties

[ options.priority ] : PriorityString | Number

The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

Defaults to 'normal'

Defaults to {}
off( event, callback )

mixed

Stops executing the callback on the given event. Shorthand for this.stopListening( this, event, callback ).

See source

Parameters

event : String

The name of the event.

callback : function

The function to stop being called.
on( event, callback, [ options ] = { [options.priority] } )

mixed

Registers a callback function to be executed when an event is fired.

See source

Shorthand for this.listenTo( this, event, callback, options ) (it makes the emitter listen on itself).

Parameters

event : String

The name of the event.

callback : function

The function to be called on event.

[ options ] : Object

Additional options.

Properties

[ options.priority ] : PriorityString | Number

The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

Defaults to 'normal'

Defaults to {}
once( event, callback, [ options ] = { [options.priority] } )

mixed

Registers a callback function to be executed on the next time the event is fired only. This is similar to calling on followed by off in the callback.

See source

Parameters

event : String

The name of the event.

callback : function

The function to be called on event.

[ options ] : Object

Additional options.

Properties

[ options.priority ] : PriorityString | Number

The priority of this event callback. The higher the priority value the sooner the callback will be fired. Events having the same priority are called in the order they were added.

Defaults to 'normal'

Defaults to {}
refresh()

inherited

Refreshes the command. The command should update its isEnabled and value properties in this method.

See source

This method is automatically called when any changes are applied to the document.
restoreManualDecoratorStates()

Synchronizes the state of manualDecorators with the currently present elements in the model.

See source
set( name, [ value ] )

mixed

Creates and sets the value of an observable property of this object. Such an property becomes a part of the state and is be observable.

See source

It accepts also a single object literal containing key/value pairs with properties to be set.

This method throws the observable-set-cannot-override error if the observable instance already have a property with the given property name. This prevents from mistakenly overriding existing properties and methods, but means that foo.set( 'bar', 1 ) may be slightly slower than foo.bar = 1.

Parameters

name : String | Object

The property's name or object with name=>value pairs.

[ value ] : *

The property's value (if name was passed in the first parameter).
stopDelegating( [ event ], [ emitter ] )

mixed
Stops delegating events. It can be used at different levels:

See source
- To stop delegating all events.
- To stop delegating a specific event to all emitters.
- To stop delegating a specific event to a specific emitter.
Parameters

[ event ] : String

The name of the event to stop delegating. If omitted, stops it all delegations.

[ emitter ] : Emitter

(requires event) The object to stop delegating a particular event to. If omitted, stops delegation of event to all emitters.
stopListening( [ emitter ], [ event ], [ callback ] )

mixed
Stops listening for events. It can be used at different levels:

See source
- To stop listening to a specific callback.
- To stop listening to a specific event.
- To stop listening to all events fired by a specific object.
- To stop listening to all events fired by all objects.
Parameters

[ emitter ] : Emitter

The object to stop listening to. If omitted, stops it for all objects.

[ event ] : String

(Requires the emitter) The name of the event to stop listening to. If omitted, stops it for all events from emitter.

[ callback ] : function

(Requires the event) The function to be removed from the call list for the given event.
unbind( [ unbindProperties ] )

mixed
Removes the binding created with bind.

See source
```
// Removes the binding for the 'a' property.
A.unbind( 'a' );

// Removes bindings for all properties.
A.unbind();
```
Parameters

[ unbindProperties ] : String

Observable properties to be unbound. All the bindings will be released if no properties are provided.
_getDecoratorStateFromModel( decoratorName ) → Boolean

private

Provides information whether a decorator with a given name is present in the currently processed selection.

See source

Parameters

decoratorName : String

The name of the manual decorator used in the model

Returns

Boolean

The information whether a given decorator is currently present in the selection.

Events

change:isEnabled( eventInfo, name, value, oldValue )

inherited

Fired when the isEnabled property changed value.

See source

Parameters

eventInfo : EventInfo

An object containing information about the fired event.

name : String

Name of the changed property (isEnabled).

value : Boolean

New value of the isEnabled property with given key or null, if operation should remove property.

oldValue : Boolean

Old value of the isEnabled property with given key or null, if property was not set before.
change:value( eventInfo, name, value, oldValue )

Fired when the value property changed value.

See source

Parameters

eventInfo : EventInfo

An object containing information about the fired event.

name : String

Name of the changed property (value).

value : Object | undefined

New value of the value property with given key or null, if operation should remove property.

oldValue : Object | undefined

Old value of the value property with given key or null, if property was not set before.
change:{property}( eventInfo, name, value, oldValue )

mixed
Fired when a property changed value.

See source
```
observable.set( 'prop', 1 );

observable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
    console.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );
} );

observable.prop = 2; // -> 'prop has changed from 1 to 2'
```
Parameters

eventInfo : EventInfo

An object containing information about the fired event.

name : String

The property name.

value : *

The new property value.

oldValue : *

The previous property value.
execute( eventInfo )

inherited

Event fired by the execute method. The command action is a listener to this event so it's possible to change/cancel the behavior of the command by listening to this event.

See source

See decorate for more information and samples.

Note: This event is fired even if command is disabled. However, it is automatically blocked by a high priority listener in order to prevent command execution.

Parameters

eventInfo : EventInfo

An object containing information about the fired event.
set:{property}( eventInfo, name, value, oldValue )

mixed
Fired when a property value is going to be set but is not set yet (before the change event is fired).

See source
You can control the final value of the property by using the event's return property.
```
observable.set( 'prop', 1 );

observable.on( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {
    console.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );
    console.log( `Current property value is ${ observable[ propertyName ] }` );

    // Let's override the value.
    evt.return = 3;
} );

observable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {
    console.log( `Value has changed from ${ oldValue } to ${ newValue }` );
} );

observable.prop = 2; // -> 'Value is going to be changed from 1 to 2'
                     // -> 'Current property value is 1'
                     // -> 'Value has changed from 1 to 3'
```
Note: Event is fired even when the new value is the same as the old value.

Parameters

eventInfo : EventInfo

An object containing information about the fired event.

name : String

The property name.

value : *

The new property value.

oldValue : *

The previous property value.

LinkCommand (link)

Filtering

Properties

editor : Editormodule:link/linkcommand~LinkCommand#editor

isEnabled : Booleanmodule:link/linkcommand~LinkCommand#isEnabled

manualDecorators : Collectionmodule:link/linkcommand~LinkCommand#manualDecorators

value : Object | undefinedmodule:link/linkcommand~LinkCommand#value

_disableStack : Set.<String>module:link/linkcommand~LinkCommand#_disableStack

Methods

constructor( editor )module:link/linkcommand~LinkCommand#constructor

Parameters

bind( bindProperties ) → Objectmodule:link/linkcommand~LinkCommand#bind

Parameters

Returns

clearForceDisabled( id )module:link/linkcommand~LinkCommand#clearForceDisabled

Parameters

decorate( methodName )module:link/linkcommand~LinkCommand#decorate

Parameters

delegate( events ) → EmitterMixinDelegateChainmodule:link/linkcommand~LinkCommand#delegate

Parameters

Returns

destroy()module:link/linkcommand~LinkCommand#destroy

execute( href, [ manualDecoratorIds ] )module:link/linkcommand~LinkCommand#execute

Decorators and model attribute management

Parameters

Fires

fire( eventOrInfo, [ args ] ) → *module:link/linkcommand~LinkCommand#fire

Parameters

Returns

forceDisabled( id )module:link/linkcommand~LinkCommand#forceDisabled

Parameters

listenTo( emitter, event, callback, [ options ] = { [options.priority] } )module:link/linkcommand~LinkCommand#listenTo

Parameters

off( event, callback )module:link/linkcommand~LinkCommand#off

Parameters

on( event, callback, [ options ] = { [options.priority] } )module:link/linkcommand~LinkCommand#on

Parameters

once( event, callback, [ options ] = { [options.priority] } )module:link/linkcommand~LinkCommand#once

Parameters

refresh()module:link/linkcommand~LinkCommand#refresh

restoreManualDecoratorStates()module:link/linkcommand~LinkCommand#restoreManualDecoratorStates

set( name, [ value ] )module:link/linkcommand~LinkCommand#set

Parameters

stopDelegating( [ event ], [ emitter ] )module:link/linkcommand~LinkCommand#stopDelegating

Parameters

stopListening( [ emitter ], [ event ], [ callback ] )module:link/linkcommand~LinkCommand#stopListening

Parameters

unbind( [ unbindProperties ] )module:link/linkcommand~LinkCommand#unbind

Parameters

_getDecoratorStateFromModel( decoratorName ) → Booleanmodule:link/linkcommand~LinkCommand#_getDecoratorStateFromModel

Parameters

Returns

Events

change:isEnabled( eventInfo, name, value, oldValue )module:link/linkcommand~LinkCommand#event:change:isEnabled

Parameters

change:value( eventInfo, name, value, oldValue )module:link/linkcommand~LinkCommand#event:change:value

Parameters

change:{property}( eventInfo, name, value, oldValue )module:link/linkcommand~LinkCommand#event:change:{property}

Parameters

execute( eventInfo )module:link/linkcommand~LinkCommand#event:execute

Parameters

set:{property}( eventInfo, name, value, oldValue )module:link/linkcommand~LinkCommand#event:set:{property}

Parameters

`editor : Editor`

`isEnabled : Boolean`

`manualDecorators : Collection`

`value : Object | undefined`

`_disableStack : Set.<String>`

`constructor( editor )`

`bind( bindProperties ) → Object`

`clearForceDisabled( id )`

`decorate( methodName )`

`delegate( events ) → EmitterMixinDelegateChain`

`destroy()`

`execute( href, [ manualDecoratorIds ] )`

`fire( eventOrInfo, [ args ] ) → *`

`forceDisabled( id )`

`listenTo( emitter, event, callback, [ options ] = { [options.priority] } )`

`off( event, callback )`

`on( event, callback, [ options ] = { [options.priority] } )`

`once( event, callback, [ options ] = { [options.priority] } )`

`refresh()`

`restoreManualDecoratorStates()`

`set( name, [ value ] )`

`stopDelegating( [ event ], [ emitter ] )`

`stopListening( [ emitter ], [ event ], [ callback ] )`

`unbind( [ unbindProperties ] )`

`_getDecoratorStateFromModel( decoratorName ) → Boolean`

`change:isEnabled( eventInfo, name, value, oldValue )`

`change:value( eventInfo, name, value, oldValue )`

`change:{property}( eventInfo, name, value, oldValue )`

`execute( eventInfo )`

`set:{property}( eventInfo, name, value, oldValue )`