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Class

ContainerElement (engine/view)

@ckeditor/ckeditor5-engine/src/view/containerelement

class
See source

Containers are elements which define document structure. They define boundaries for attributes. They are mostly used for block elements like <p> or <div>.

Editing engine does not define a fixed HTML DTD. This is why a feature developer needs to choose between various types (container element, attribute element, empty element, etc) when developing a feature.

The container element should be your default choice when writing a converter, unless:

  • this element represents a model text attribute (then use AttributeElement),
  • this is an empty element like <img> (then use EmptyElement),
  • this is a root element,
  • this is a nested editable element (then use EditableElement).

To create a new container element instance use the DowncastWriter#createContainerElement() method.

Filtering

Properties

  • childCount : Number

    readonly inherited

    Number of element's children.

    See source

  • document : Document

    readonly inherited

    The document instance to which this node belongs.

    See source

  • index : Number | null

    readonly inherited

    Index of the node in the parent element or null if the node has no parent.

    See source

    Accessing this property throws an error if this node's parent element does not contain it. This means that view tree got broken.

  • isEmpty : Boolean

    readonly inherited

    Is true if there are no nodes inside this element, false otherwise.

    See source

  • name : String

    readonly inherited

    Name of the element.

    See source

  • nextSibling : Node | null

    readonly inherited

    Node's next sibling, or null if it is the last child.

    See source

  • parent : Element | DocumentFragment | null

    readonly inherited

    Parent element. Null by default. Set by _insertChild.

    See source

  • previousSibling : Node | null

    readonly inherited

    Node's previous sibling, or null if it is the first child.

    See source

  • root : Node | DocumentFragment

    readonly inherited

    Top-most ancestor of the node. If the node has no parent it is the root itself.

    See source

  • _attrs : Map

    protected inherited

    Map of attributes, where attributes names are keys and attributes values are values.

    See source

  • _children : Array.<Node>

    protected inherited

    Array of child nodes.

    See source

  • _classes : Set

    protected inherited

    Set of classes associated with element instance.

    See source

  • _customProperties : Map

    protected inherited

    Map of custom properties. Custom properties can be added to element instance, will be cloned but not rendered into DOM.

    See source

  • _styles : StylesMap

    protected inherited

    Normalized styles.

    See source

  • _unsafeAttributesToRender : Array.<String>

    private readonly inherited

    A list of attribute names that should be rendered in the editing pipeline even though filtering mechanisms implemented in the DomConverter (for instance, shouldRenderAttribute) would filter them out.

    See source

    These attributes can be specified as an option when the element is created by the DowncastWriter. To check whether an unsafe an attribute should be permitted, use the shouldRenderUnsafeAttribute method.

Methods

  • constructor( document, name, [ attrs ], [ children ] )

    protected

    Creates a container element.

    See source

    Parameters

    document : Document

    The document instance to which this element belongs.

    name : String

    Node name.

    [ attrs ] : Object | Iterable

    Collection of attributes.

    [ children ] : Node | Iterable.<Node>

    A list of nodes to be inserted into created element.

    Related:

  • findAncestor( patterns ) → Element | null

    inherited

    Returns ancestor element that match specified pattern. Provided patterns should be compatible with Matcher as it is used internally.

    See source

    Parameters

    patterns : Object | String | RegExp | function

    Patterns used to match correct ancestor. See Matcher.

    Returns

    Element | null

    Found element or null if no matching ancestor was found.

    Related:

  • getAncestors( options = { [options.includeSelf], [options.parentFirst] } ) → Array

    inherited

    Returns ancestors array of this node.

    See source

    Parameters

    options : Object

    Options object.

    Properties
    [ options.includeSelf ] : Boolean

    When set to true this node will be also included in parent's array.

    Defaults to false

    [ options.parentFirst ] : Boolean

    When set to true, array will be sorted from node's parent to root element, otherwise root element will be the first item in the array.

    Defaults to false

    Returns

    Array

    Array with ancestors.

  • getAttribute( key ) → String | undefined

    inherited

    Gets attribute by key. If attribute is not present - returns undefined.

    See source

    Parameters

    key : String

    Attribute key.

    Returns

    String | undefined

    Attribute value.

  • getAttributeKeys() → Iterable.<String>

    inherited

    Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.

    See source

    Returns

    Iterable.<String>

    Keys for attributes.

  • getAttributes() → Iterable.<*>

    inherited

    Returns iterator that iterates over this element's attributes.

    See source

    Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value. This format is accepted by native Map object and also can be passed in Node constructor.

    Returns

    Iterable.<*>

  • getChild( index ) → Node

    inherited

    Gets child at the given index.

    See source

    Parameters

    index : Number

    Index of child.

    Returns

    Node

    Child node.

  • getChildIndex( node ) → Number

    inherited

    Gets index of the given child node. Returns -1 if child node is not found.

    See source

    Parameters

    node : Node

    Child node.

    Returns

    Number

    Index of the child node.

  • getChildren() → Iterable.<Node>

    inherited

    Gets child nodes iterator.

    See source

    Returns

    Iterable.<Node>

    Child nodes iterator.

  • getClassNames() → Iterable.<String>

    inherited

    Returns iterator that contains all class names.

    See source

    Returns

    Iterable.<String>

  • getCommonAncestor( node, options = { [options.includeSelf] } ) → Element | DocumentFragment | null

    inherited

    Returns a Element or DocumentFragment which is a common ancestor of both nodes.

    See source

    Parameters

    node : Node

    The second node.

    options : Object

    Options object.

    Properties
    [ options.includeSelf ] : Boolean

    When set to true both nodes will be considered "ancestors" too. Which means that if e.g. node A is inside B, then their common ancestor will be B.

    Defaults to false

    Returns

    Element | DocumentFragment | null

  • getCustomProperties() → Iterable.<*>

    inherited

    Returns an iterator which iterates over this element's custom properties. Iterator provides [ key, value ] pairs for each stored property.

    See source

    Returns

    Iterable.<*>

  • getCustomProperty( key ) → *

    inherited

    Returns the custom property value for the given key.

    See source

    Parameters

    key : String | Symbol

    Returns

    *

  • getFillerOffset() → Number | null

    inherited

    Returns block filler offset or null if block filler is not needed.

    See source

    Returns

    Number | null

    Block filler offset or null if block filler is not needed.

  • getIdentity() → String

    inherited

    Returns identity string based on element's name, styles, classes and other attributes. Two elements that are similar will have same identity string. It has the following format:

    See source
    'name class="class1,class2" style="style1:value1;style2:value2" attr1="val1" attr2="val2"'

    For example:

    const element = writer.createContainerElement( 'foo', {
	banana: '10',
	apple: '20',
	style: 'color: red; border-color: white;',
	class: 'baz'
} );

// returns 'foo class="baz" style="border-color:white;color:red" apple="20" banana="10"'
element.getIdentity();

    Note: Classes, styles and other attributes are sorted alphabetically.

    Returns

    String

  • getNormalizedStyle( property ) → Object | String | undefined

    inherited

    Returns a normalized style object or single style value.

    See source

    For an element with style set to: margin:1px 2px 3em;

    element.getNormalizedStyle( 'margin' ) );

    will return:

    {
	top: '1px',
	right: '2px',
	bottom: '3em',
	left: '2px'    // a normalized value from margin shorthand
}

    and reading for single style value:

    styles.getNormalizedStyle( 'margin-left' );

    Will return a 2px string.

    Note: This method will return normalized values only if a particular style processor rule is enabled. See StylesMap#getNormalized() for details.

    Parameters

    property : String

    Name of CSS property

    Returns

    Object | String | undefined

  • getPath() → Array.<Number>

    inherited

    Gets a path to the node. The path is an array containing indices of consecutive ancestors of this node, beginning from root, down to this node's index.

    See source
    const abc = downcastWriter.createText( 'abc' );
const foo = downcastWriter.createText( 'foo' );
const h1 = downcastWriter.createElement( 'h1', null, downcastWriter.createText( 'header' ) );
const p = downcastWriter.createElement( 'p', null, [ abc, foo ] );
const div = downcastWriter.createElement( 'div', null, [ h1, p ] );
foo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.
h1.getPath(); // Returns [ 0 ].
div.getPath(); // Returns [].

    Returns

    Array.<Number>

    The path.

  • getStyle( property ) → String | undefined

    inherited

    Returns style value for the given property mae. If the style does not exist undefined is returned.

    See source

    Note: This method can work with normalized style names if a particular style processor rule is enabled. See StylesMap#getAsString() for details.

    For an element with style set to 'margin:1px':

    // Enable 'margin' shorthand processing:
editor.data.addStyleProcessorRules( addMarginRules );

const element = view.change( writer => {
	const element = writer.createElement();
	writer.setStyle( 'margin', '1px' );
	writer.setStyle( 'margin-bottom', '3em' );

	return element;
} );

element.getStyle( 'margin' ); // -> 'margin: 1px 1px 3em;'

    Parameters

    property : String

    Returns

    String | undefined

  • getStyleNames( [ expand ] ) → Iterable.<String>

    inherited

    Returns iterator that contains all style names.

    See source

    Parameters

    [ expand ] : Boolean

    Expand shorthand style properties and return all equivalent style representations.

    Defaults to false

    Returns

    Iterable.<String>

  • hasAttribute( key ) → Boolean

    inherited

    Returns a boolean indicating whether an attribute with the specified key exists in the element.

    See source

    Parameters

    key : String

    Attribute key.

    Returns

    Boolean

    true if attribute with the specified key exists in the element, false otherwise.

  • hasClass( className )

    inherited

    Returns true if class is present. If more then one class is provided - returns true only when all classes are present.

    See source
    element.hasClass( 'foo' ); // Returns true if 'foo' class is present.
element.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.

    Parameters

    className : String

  • hasStyle( property )

    inherited

    Returns true if style keys are present. If more then one style property is provided - returns true only when all properties are present.

    See source
    element.hasStyle( 'color' ); // Returns true if 'border-top' style is present.
element.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.

    Parameters

    property : String

  • is( type ) → Boolean

    inherited

    Checks whether this object is of the given type.

    See source

    This method is useful when processing view objects that are of unknown type. For example, a function may return a DocumentFragment or a Node that can be either a text node or an element. This method can be used to check what kind of object is returned.

    someObject.is( 'element' ); // -> true if this is an element
someObject.is( 'node' ); // -> true if this is a node (a text node or an element)
someObject.is( 'documentFragment' ); // -> true if this is a document fragment

    Since this method is also available on a range of model objects, you can prefix the type of the object with model: or view: to check, for example, if this is the model's or view's element:

    viewElement.is( 'view:element' ); // -> true
viewElement.is( 'model:element' ); // -> false

    By using this method it is also possible to check a name of an element:

    imgElement.is( 'element', 'img' ); // -> true
imgElement.is( 'view:element', 'img' ); // -> same as above, but more precise

    The list of view objects which implement the is() method:

    Parameters

    type : String

    Type to check.

    Returns

    Boolean

  • isAfter( node ) → Boolean

    inherited

    Returns whether this node is after given node. false is returned if nodes are in different trees (for example, in different DocumentFragments).

    See source

    Parameters

    node : Node

    Node to compare with.

    Returns

    Boolean

  • isAttached() → Boolean

    inherited

    Returns true if the node is in a tree rooted in the document (is a descendant of one of its roots).

    See source

    Returns

    Boolean

  • isBefore( node ) → Boolean

    inherited

    Returns whether this node is before given node. false is returned if nodes are in different trees (for example, in different DocumentFragments).

    See source

    Parameters

    node : Node

    Node to compare with.

    Returns

    Boolean

  • isSimilar( otherElement ) → Boolean

    inherited

    Checks if this element is similar to other element. Both elements should have the same name and attributes to be considered as similar. Two similar elements can contain different set of children nodes.

    See source

    Parameters

    otherElement : Element

    Returns

    Boolean

  • shouldRenderUnsafeAttribute( attributeName ) → Boolean

    inherited

    Decides whether an unsafe attribute is whitelisted and should be rendered in the editing pipeline even though filtering mechanisms like shouldRenderAttribute say it should not.

    See source

    Unsafe attribute names can be specified when creating an element via DowncastWriter.

    Parameters

    attributeName : String

    The name of the attribute to be checked.

    Returns

    Boolean

  • toJSON() → Object

    inherited

    Custom toJSON method to solve child-parent circular dependencies.

    See source

    Returns

    Object

    Clone of this object with the parent property removed.

  • _addClass( className )

    protected inherited

    Adds specified class.

    See source
    element._addClass( 'foo' ); // Adds 'foo' class.
element._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.

    Parameters

    className : Array.<String> | String

    Fires

    Related:

  • _appendChild( items ) → Number

    protected inherited

    Insert a child node or a list of child nodes at the end of this node and sets the parent of these nodes to this element.

    See source

    Parameters

    items : Item | Iterable.<Item>

    Items to be inserted.

    Returns

    Number

    Number of appended nodes.

    Fires

    Related:

  • _clone( [ deep ] ) → Element

    protected inherited

    Clones provided element.

    See source

    Parameters

    [ deep ] : Boolean

    If set to true clones element and all its children recursively. When set to false, element will be cloned without any children.

    Defaults to false

    Returns

    Element

    Clone of this element.

  • _fireChange( type, node )

    protected inherited

    Parameters

    type : ChangeType

    Type of the change.

    node : Node

    Changed node.

    Fires

  • _insertChild( index, items ) → Number

    protected inherited

    Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to this element.

    See source

    Parameters

    index : Number

    Position where nodes should be inserted.

    items : Item | Iterable.<Item>

    Items to be inserted.

    Returns

    Number

    Number of inserted nodes.

    Fires

    Related:

  • _remove()

    protected inherited

    Removes node from parent.

    See source

  • _removeAttribute( key ) → Boolean

    protected inherited

    Removes attribute from the element.

    See source

    Parameters

    key : String

    Attribute key.

    Returns

    Boolean

    Returns true if an attribute existed and has been removed.

    Fires

    Related:

  • _removeChildren( index, [ howMany ] ) → Array.<Node>

    protected inherited

    Removes number of child nodes starting at the given index and set the parent of these nodes to null.

    See source

    Parameters

    index : Number

    Number of the first node to remove.

    [ howMany ] : Number

    Number of nodes to remove.

    Defaults to 1

    Returns

    Array.<Node>

    The array of removed nodes.

    Fires

    Related:

  • _removeClass( className )

    protected inherited

    Removes specified class.

    See source
    element._removeClass( 'foo' );  // Removes 'foo' class.
element._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.

    Parameters

    className : Array.<String> | String

    Fires

    Related:

  • _removeCustomProperty( key ) → Boolean

    protected inherited

    Removes the custom property stored under the given key.

    See source

    Parameters

    key : String | Symbol

    Returns

    Boolean

    Returns true if property was removed.

    Related:

  • _removeStyle( property )

    protected inherited

    Removes specified style.

    See source
    element._removeStyle( 'color' );  // Removes 'color' style.
element._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.

    Note: This method can work with normalized style names if a particular style processor rule is enabled. See StylesMap#remove() for details.

    Parameters

    property : Array.<String> | String

    Fires

    Related:

  • _setAttribute( key, value )

    protected inherited

    Adds or overwrite attribute with a specified key and value.

    See source

    Parameters

    key : String

    Attribute key.

    value : String

    Attribute value.

    Fires

    Related:

  • _setCustomProperty( key, value )

    protected inherited

    Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM, so they can be used to add special data to elements.

    See source

    Parameters

    key : String | Symbol
    value : *

    Related:

  • _setStyle( property, [ value ] )

    protected inherited

    Adds style to the element.

    See source
    element._setStyle( 'color', 'red' );
element._setStyle( {
	color: 'red',
	position: 'fixed'
} );

    Note: This method can work with normalized style names if a particular style processor rule is enabled. See StylesMap#set() for details.

    Parameters

    property : String | Object

    Property name or object with key - value pairs.

    [ value ] : String

    Value to set. This parameter is ignored if object is provided as the first parameter.

    Fires

    Related:

Events

  • change( eventInfo )

    inherited

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

  • change:attributes( eventInfo, changedNode )

    inherited

    Fired when list of elements attributes changes.

    See source

    Change event is bubbled – it is fired on all ancestors.

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    changedNode : Node

  • change:children( eventInfo, changedNode )

    inherited

    Fired when list of elements children changes.

    See source

    Change event is bubbled – it is fired on all ancestors.

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    changedNode : Node

  • change:text( eventInfo, changedNode )

    inherited

    Fired when text nodes data changes.

    See source

    Change event is bubbled – it is fired on all ancestors.

    Parameters

    eventInfo : EventInfo

    An object containing information about the fired event.

    changedNode : Node