DocumentCompare

class

DocumentCompare provides a set of tools that allows you to process editor document data by custom external logic, evaluate the differences between original and processed data, and apply them as granular changes or tracked suggestions.

Contrary to editor.setData(), this does not replace the whole editor data. Instead, atomic changes are evaluated and a small set of changes is applied to the document. This is especially useful when the editor also uses Track Changes, Revision History, and Real-Time Collaboration features.

Use process(), to run the whole pipeline in one call - it takes document snapshot, processes the data, and applies granular changes:

await documentCompare.process( async snapshot => callMyService( snapshot.content ) );

// Or, to apply changes as suggestions:
await documentCompare.process( async snapshot => callMyService( snapshot.content ), { asSuggestions: true } );

Some integrations need to process the data in separate steps (e.g. backend processing, or when changes are not applied immediately to the content). In this case, you can capture a snapshot first and apply the result later:

const snapshot = documentCompare.makeSnapshot();
const processed = await callMyService( snapshot.content );

// ...

const patch = documentCompare.diffSnapshot( snapshot, processed, { asSuggestions: true } );
documentCompare.applyPatch( patch );

Properties

editor : Editor
readonlyinherited
module:ai/aisdk/documentcompare~DocumentCompare#editor
The editor instance.
Note that most editors implement the ui property. However, editors with an external UI (i.e. Bootstrap-based) or a headless editor may not have this property or throw an error when accessing it.
Because of above, to make plugins more universal, it is recommended to split features into:
- The "editing" part that uses the Editor class without ui property.
- The "UI" part that uses the Editor class and accesses ui property.
isEnabled : boolean
readonlyinheritedobservable
module:ai/aisdk/documentcompare~DocumentCompare#isEnabled
Flag indicating whether a plugin is enabled or disabled. A disabled plugin will not transform text.
Plugin can be simply disabled like that:
```
// Disable the plugin so that no toolbars are visible.
editor.plugins.get( 'TextTransformation' ).isEnabled = false;
```
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You can also use forceDisabled method.

Static properties

isContextPlugin : false
readonlyinheritedstatic
pluginName : 'DocumentCompare'
readonlystatic
requires : readonly [ PluginConstructor<Editor> & new ( context: Editor ) => DocumentChanges, PluginConstructor<Editor> & new ( context: Editor ) => DocumentCompareUtils ]
readonlystatic

Methods

constructor( editor )
inherited

Parameters
editor : Editor
afterInit() → void

Returns
void
applyPatch( patch ) → void

Applies a patch to the current state of the document.
As a result, all changes described by the patch are reflected in the document. Note, that this converges with all changes that happened on the document after the snapshot was made, including both local and remote edits (if real-time collaboration is enabled).
Note, that the patch can be only applied to the same document as the snapshot, and only during the same editing session. Otherwise, documentcompare-apply-session-mismatch error is thrown.
The patch is first validated against a copy of the document before anything is committed. In case if any errors or conflict resolution problems surface during this dry-run, documentcompare-invalid-patch error is thrown, and the editor data is left intact.
The changes can be applied directly to the content or as tracked suggestions (requires Track changes plugin). See also diffSnapshot.
Parameters
patch : DocumentComparePatch
The patch to apply, as produced by diffSnapshot.
Returns
void
bind( bindProperty1, bindProperty2 ) → ObservableDualBindChain<K1, DocumentCompare[ K1 ], K2, DocumentCompare[ K2 ]>
inherited
module:ai/aisdk/documentcompare~DocumentCompare#bind:DUAL_BIND
Binds observable properties to other objects implementing the Observable interface.
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' );
```
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or even shorter:
```
button.bind( 'isEnabled' ).to( command );
```
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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' );
```
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It is possible to bind more than one property at a time to shorten the code:
```
button.bind( 'isEnabled', 'value' ).to( command );
```
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which corresponds to:
```
button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
```
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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 );
```
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Using a custom callback allows processing the value before passing it to the target property:
```
button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
```
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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 );
```
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Type parameters
K1
K2
Parameters
bindProperty1 : K1
Observable property that will be bound to other observable(s).
bindProperty2 : K2
Observable property that will be bound to other observable(s).
Returns
ObservableDualBindChain<K1, DocumentCompare[ K1 ], K2, DocumentCompare[ K2 ]>
The bind chain with the to() and toMany() methods.
bind( bindProperties ) → ObservableMultiBindChain
inherited
module:ai/aisdk/documentcompare~DocumentCompare#bind:MANY_BIND
Binds observable properties to other objects implementing the Observable interface.
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' );
```
Copy code
or even shorter:
```
button.bind( 'isEnabled' ).to( command );
```
Copy code
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' );
```
Copy code
It is possible to bind more than one property at a time to shorten the code:
```
button.bind( 'isEnabled', 'value' ).to( command );
```
Copy code
which corresponds to:
```
button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
```
Copy code
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 );
```
Copy code
Using a custom callback allows processing the value before passing it to the target property:
```
button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
```
Copy code
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 );
```
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Parameters
bindProperties : Array<'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'destroy' | 'init' | 'editor' | 'afterInit' | 'isEnabled' | 'forceDisabled' | 'clearForceDisabled' | 'process' | 'makeSnapshot' | 'diffSnapshot' | 'applyPatch'>
Observable properties that will be bound to other observable(s).
Returns
ObservableMultiBindChain
The bind chain with the to() and toMany() methods.
bind( bindProperty ) → ObservableSingleBindChain<K, DocumentCompare[ K ]>
inherited
module:ai/aisdk/documentcompare~DocumentCompare#bind:SINGLE_BIND
Binds observable properties to other objects implementing the Observable interface.
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' );
```
Copy code
or even shorter:
```
button.bind( 'isEnabled' ).to( command );
```
Copy code
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' );
```
Copy code
It is possible to bind more than one property at a time to shorten the code:
```
button.bind( 'isEnabled', 'value' ).to( command );
```
Copy code
which corresponds to:
```
button.bind( 'isEnabled' ).to( command );
button.bind( 'value' ).to( command );
```
Copy code
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 );
```
Copy code
Using a custom callback allows processing the value before passing it to the target property:
```
button.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );
```
Copy code
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 );
```
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Type parameters
K
Parameters
bindProperty : K
Observable property that will be bound to other observable(s).
Returns
ObservableSingleBindChain<K, DocumentCompare[ K ]>
The bind chain with the to() and toMany() methods.
clearForceDisabled( id ) → void
inherited

Clears forced disable previously set through forceDisabled. See forceDisabled.
Parameters
id : string
Unique identifier, equal to the one passed in forceDisabled call.
Returns
void
decorate( methodName ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#decorate
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.
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 extends ObservableMixin() {
	constructor() {
		super();
		this.decorate( 'method' );
	}

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

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

foo.method(); // Nothing is logged.
```
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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'
```
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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'
```
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Parameters
methodName : 'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'destroy' | 'init' | 'editor' | 'afterInit' | 'isEnabled' | 'forceDisabled' | 'clearForceDisabled' | 'process' | 'makeSnapshot' | 'diffSnapshot' | 'applyPatch'
Name of the method to decorate.
Returns
void
delegate( events ) → EmitterMixinDelegateChain
inherited
module:ai/aisdk/documentcompare~DocumentCompare#delegate
Delegates selected events to another Emitter. For instance:
```
emitterA.delegate( 'eventX' ).to( emitterB );
emitterA.delegate( 'eventX', 'eventY' ).to( emitterC );
```
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then eventX is delegated (fired by) emitterB and emitterC along with data:
```
emitterA.fire( 'eventX', data );
```
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and eventY is delegated (fired by) emitterC along with data:
```
emitterA.fire( 'eventY', data );
```
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Parameters
events : Array<string>
Event names that will be delegated to another emitter.
Returns
EmitterMixinDelegateChain
destroy() → void
inherited

Destroys the plugin.
Note: This method is optional. A plugin instance does not need to have it defined.
Returns
void
diffSnapshot( snapshot, data, options ) → DocumentComparePatch

Diffs the snapshot against processed data, returning a document patch - a set of granular differences between the two states.
Use options to set whether the patch should be calculated and applied as tracked changes or as direct changes to the document.
You can apply the patch using applyPatch.
Parameters
snapshot : DocumentCompareSnapshot
The captured before-state to diff against.
data : string | Record<string, string>
The processed data. For multi-root editor, pass an object keyed by root name.
options : DocumentCompareDiffOptions
How the comparison is computed.

Defaults to {}
Returns
DocumentComparePatch
The patch bringing the document from the snapshot to the processed state.
fire( eventOrInfo, args ) → GetEventInfo<TEvent>[ 'return' ]
inherited

Fires an event, executing all callbacks registered for it.
The first parameter passed to callbacks is an EventInfo object, followed by the optional args provided in the fire() method call.
Type parameters
TEvent : extends BaseEvent
The type describing the event. See BaseEvent.
Parameters
eventOrInfo : GetNameOrEventInfo<TEvent>
The name of the event or EventInfo object if event is delegated.
args : TEvent[ 'args' ]
Additional arguments to be passed to the callbacks.
Returns
GetEventInfo<TEvent>[ 'return' ]
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 ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#forceDisabled
Disables the plugin.
Plugin may be disabled by multiple features or algorithms (at once). When disabling a plugin, unique id should be passed (e.g. feature name). The same identifier should be used when enabling back the plugin. The plugin becomes enabled only after all features enabled it back.
Disabling and enabling a plugin:
```
plugin.isEnabled; // -> true
plugin.forceDisabled( 'MyFeature' );
plugin.isEnabled; // -> false
plugin.clearForceDisabled( 'MyFeature' );
plugin.isEnabled; // -> true
```
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Plugin disabled by multiple features:
```
plugin.forceDisabled( 'MyFeature' );
plugin.forceDisabled( 'OtherFeature' );
plugin.clearForceDisabled( 'MyFeature' );
plugin.isEnabled; // -> false
plugin.clearForceDisabled( 'OtherFeature' );
plugin.isEnabled; // -> true
```
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Multiple disabling with the same identifier is redundant:
```
plugin.forceDisabled( 'MyFeature' );
plugin.forceDisabled( 'MyFeature' );
plugin.clearForceDisabled( 'MyFeature' );
plugin.isEnabled; // -> true
```
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Note: some plugins or algorithms may have more complex logic when it comes to enabling or disabling certain plugins, so the plugin might be still disabled after clearForceDisabled was used.
Parameters
id : string
Unique identifier for disabling. Use the same id when enabling back the plugin.
Returns
void
init() → void

Returns
void
listenTo( emitter, event, callback, [ options ] ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#listenTo:BASE_EMITTER
Registers a callback function to be executed when an event is fired in a specific (emitter) object.
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' );
```
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An event callback can stop the event and set the return value of the fire method.
Type parameters
TEvent : extends BaseEvent
The type describing the event. See BaseEvent.
Parameters
emitter : Emitter
The object that fires the event.
event : TEvent[ 'name' ]
The name of the event.
callback : GetCallback<TEvent>
The function to be called on event.
[ options ] : GetCallbackOptions<TEvent>
Additional options.
Returns
void
makeSnapshot( selection ) → DocumentCompareSnapshot

Captures the current document state as a DocumentCompareSnapshot.
The snapshot contains all data and metadata necessary to process the data and then be able to calculate differences between the original data and the processed data.
Importantly, snapshot.content holds data for each root (excluding $graveyard) serialized to HTML. The data is stamped with data-id attributes, assigned to structural elements of the data. During processing, make sure that these data-ids are retained.
See also DocumentCompareSnapshot.
Parameters
selection : Iterable<ModelRange>
Ranges to capture with the snapshot as the user's selection. Must not intersect. By default no selection is captured.

Defaults to []
Returns
DocumentCompareSnapshot
The captured snapshot.
off( event, callback ) → void
inherited

Stops executing the callback on the given event. Shorthand for this.stopListening( this, event, callback ).
Parameters
event : string
The name of the event.
callback : Function
The function to stop being called.
Returns
void
on( event, callback, [ options ] ) → void
inherited

Registers a callback function to be executed when an event is fired.
Shorthand for this.listenTo( this, event, callback, options ) (it makes the emitter listen on itself).
Type parameters
TEvent : extends BaseEvent
The type descibing the event. See BaseEvent.
Parameters
event : TEvent[ 'name' ]
The name of the event.
callback : GetCallback<TEvent>
The function to be called on event.
[ options ] : GetCallbackOptions<TEvent>
Additional options.
Returns
void
once( event, callback, [ options ] ) → void
inherited

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.
Type parameters
TEvent : extends BaseEvent
The type descibing the event. See BaseEvent.
Parameters
event : TEvent[ 'name' ]
The name of the event.
callback : GetCallback<TEvent>
The function to be called on event.
[ options ] : GetCallbackOptions<TEvent>
Additional options.
Returns
void
process( callback, options ) → Promise<boolean>

Runs the whole processing pipeline in one call: snapshots the document, hands the snapshot to callback for external processing (e.g. an AI service), then diffs returned data and applies granular changes to the document.
If diffing or applying fails, the underlying error is rethrown and can be further handled, unless options.overwriteOnError is set, in which case the current document is instead fully replaced with the processed data, the same way as if editor.setData() was used. In this case, changes that happened to the document after the snapshot was taken will be overwritten.
Parameters
callback : ( snapshot: DocumentCompareSnapshot ) => Promise<string | Record<string, string>>
Receives the captured snapshot and returns the processed data keyed by root name.
options : DocumentCompareProcessOptions
Additional processing options.

Defaults to {}
Returns
Promise<boolean>
true when the process finished successfully and changes were applied granularly, false when the full-replacement fallback was used.
set( values ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#set:OBJECT
Creates and sets the value of an observable properties of this object. Such a property becomes a part of the state and is observable.
It accepts 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 has 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.
In TypeScript, those properties should be declared in class using declare keyword. In example:
```
public declare myProp1: number;
public declare myProp2: string;

constructor() {
	this.set( {
		'myProp1: 2,
		'myProp2: 'foo'
	} );
}
```
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Parameters
values : object & object
An object with name=>value pairs.
Returns
void
set( name, value ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#set:KEY_VALUE
Creates and sets the value of an observable property of this object. Such a property becomes a part of the state and is observable.
This method throws the observable-set-cannot-override error if the observable instance already has 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.
In TypeScript, those properties should be declared in class using declare keyword. In example:
```
public declare myProp: number;

constructor() {
	this.set( 'myProp', 2 );
}
```
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Type parameters
K
Parameters
name : K
The property's name.
value : DocumentCompare[ K ]
The property's value.
Returns
void
stopDelegating( [ event ], [ emitter ] ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#stopDelegating
Stops delegating events. It can be used at different levels:
- 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.
Returns
void
stopListening( [ emitter ], [ event ], [ callback ] ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#stopListening:BASE_STOP
Stops listening for events. It can be used at different levels:
- 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.
Returns
void
unbind( unbindProperties ) → void
inherited
module:ai/aisdk/documentcompare~DocumentCompare#unbind
Removes the binding created with bind.
```
// Removes the binding for the 'a' property.
A.unbind( 'a' );

// Removes bindings for all properties.
A.unbind();
```
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Parameters
unbindProperties : Array<'off' | 'set' | 'bind' | 'unbind' | 'decorate' | 'stopListening' | 'on' | 'once' | 'listenTo' | 'fire' | 'delegate' | 'stopDelegating' | 'destroy' | 'init' | 'editor' | 'afterInit' | 'isEnabled' | 'forceDisabled' | 'clearForceDisabled' | 'process' | 'makeSnapshot' | 'diffSnapshot' | 'applyPatch'>
Observable properties to be unbound. All the bindings will be released if no properties are provided.
Returns
void

Events

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

Fired when the isEnabled property changed value.
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:{property}( eventInfo, name, value, oldValue )
inherited
module:ai/aisdk/documentcompare~DocumentCompare#event:change:{property}
Fired when a property changed value.
```
observable.set( 'prop', 1 );

observable.on<ObservableChangeEvent<number>>( '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'
```
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Parameters
eventInfo : EventInfo
An object containing information about the fired event.
name : string
The property name.
value : TValue
The new property value.
oldValue : TValue
The previous property value.
set:isEnabled( eventInfo, name, value, oldValue )
inherited

Fired when the isEnabled property is going to be set but is not set yet (before the change event is fired).
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.
set:{property}( eventInfo, name, value, oldValue )
inherited
module:ai/aisdk/documentcompare~DocumentCompare#event:set:{property}
Fired when a property value is going to be set but is not set yet (before the change event is fired).
You can control the final value of the property by using the event's return property.
```
observable.set( 'prop', 1 );

observable.on<ObservableSetEvent<number>>( '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<ObservableChangeEvent<number>>( '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'
```
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Note: The 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 : TValue
The new property value.
oldValue : TValue
The previous property value.

DocumentCompare

Properties

editor : Editorreadonlyinherited

isEnabled : booleanreadonlyinherited Eye iconobservable

Static properties

isContextPlugin : falsereadonlyinheritedstatic

pluginName : 'DocumentCompare'readonlystatic

requires : readonly [ PluginConstructor<Editor> & new ( context: Editor ) => DocumentChanges, PluginConstructor<Editor> & new ( context: Editor ) => DocumentCompareUtils ]readonlystatic

Methods

constructor( editor )inherited

Parameters

afterInit() → void

Returns

applyPatch( patch ) → void

Parameters

Returns

bind( bindProperty1, bindProperty2 ) → ObservableDualBindChain<K1, DocumentCompare[ K1 ], K2, DocumentCompare[ K2 ]>inherited

Type parameters

Parameters

Returns

bind( bindProperties ) → ObservableMultiBindChaininherited

Parameters

Returns

bind( bindProperty ) → ObservableSingleBindChain<K, DocumentCompare[ K ]>inherited

Type parameters

Parameters

Returns

clearForceDisabled( id ) → voidinherited

Parameters

Returns

decorate( methodName ) → voidinherited

Parameters

Returns

delegate( events ) → EmitterMixinDelegateChaininherited

Parameters

Returns

destroy() → voidinherited

Returns

diffSnapshot( snapshot, data, options ) → DocumentComparePatch

Parameters

Returns

fire( eventOrInfo, args ) → GetEventInfo<TEvent>[ 'return' ]inherited

Type parameters

Parameters

Returns

forceDisabled( id ) → voidinherited

Parameters

Returns

init() → void

Returns

listenTo( emitter, event, callback, [ options ] ) → voidinherited

Type parameters

Parameters

Returns

makeSnapshot( selection ) → DocumentCompareSnapshot

Parameters

Returns

off( event, callback ) → voidinherited

Parameters

Returns

on( event, callback, [ options ] ) → voidinherited

Type parameters

Parameters

Returns

once( event, callback, [ options ] ) → voidinherited

Type parameters

Parameters

Returns

process( callback, options ) → Promise<boolean>

Parameters

Returns

set( values ) → voidinherited

Parameters

Returns

set( name, value ) → voidinherited

Type parameters

Parameters

Returns

stopDelegating( [ event ], [ emitter ] ) → voidinherited

Parameters

`editor : Editor`
readonlyinherited

`isEnabled : boolean`
readonlyinheritedobservable

`isContextPlugin : false`
readonlyinheritedstatic

`pluginName : 'DocumentCompare'`
readonlystatic

`requires : readonly [ PluginConstructor<Editor> & new ( context: Editor ) => DocumentChanges, PluginConstructor<Editor> & new ( context: Editor ) => DocumentCompareUtils ]`
readonlystatic

`constructor( editor )`
inherited

`afterInit() → void`

`applyPatch( patch ) → void`

`bind( bindProperty1, bindProperty2 ) → ObservableDualBindChain<K1, DocumentCompare[ K1 ], K2, DocumentCompare[ K2 ]>`
inherited

`bind( bindProperties ) → ObservableMultiBindChain`
inherited

`bind( bindProperty ) → ObservableSingleBindChain<K, DocumentCompare[ K ]>`
inherited

`clearForceDisabled( id ) → void`
inherited

`decorate( methodName ) → void`
inherited

`delegate( events ) → EmitterMixinDelegateChain`
inherited

`destroy() → void`
inherited

`diffSnapshot( snapshot, data, options ) → DocumentComparePatch`

`fire( eventOrInfo, args ) → GetEventInfo<TEvent>[ 'return' ]`
inherited

`forceDisabled( id ) → void`
inherited

`init() → void`

`listenTo( emitter, event, callback, [ options ] ) → void`
inherited

`makeSnapshot( selection ) → DocumentCompareSnapshot`

`off( event, callback ) → void`
inherited

`on( event, callback, [ options ] ) → void`
inherited

`once( event, callback, [ options ] ) → void`
inherited

`process( callback, options ) → Promise<boolean>`

`set( values ) → void`
inherited

`set( name, value ) → void`
inherited

`stopDelegating( [ event ], [ emitter ] ) → void`
inherited

`stopListening( [ emitter ], [ event ], [ callback ] ) → void`
inherited

`unbind( unbindProperties ) → void`
inherited

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

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

`set:isEnabled( eventInfo, name, value, oldValue )`
inherited

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