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Mixins

This class is used as a container for a series of nodes. The nodes themselves maintain the relationship between parent/child. The tree itself acts as a manager. It gives functionality to retrieve a node by its identifier: getNodeById.

The tree also relays events from any of it's child nodes, allowing them to be handled in a centralized fashion. In general this class is not used directly, rather used internally by other parts of the framework.

Defined By

Config Options

Other Configs

 
(optional) A config object containing one or more event handlers to be added to this object during initialization. T...

(optional)

A config object containing one or more event handlers to be added to this object during initialization. This should be a valid listeners config object as specified in the addListener example for attaching multiple handlers at once.


DOM events from ExtJs Components


While some ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this

is usually only done when extra value can be added. For example the DataView's click event passing the node clicked on. To access DOM events directly from a child element of a Component, we need to specify the element option to identify the Component property to add a DOM listener to:

new Ext.panel.Panel({
    width: 400,
    height: 200,
    dockedItems: [{
        xtype: 'toolbar'
    }],
    listeners: {
        click: {
            element: 'el', //bind to the underlying el property on the panel
            fn: function(){ console.log('click el'); }
        },
        dblclick: {
            element: 'body', //bind to the underlying body property on the panel
            fn: function(){ console.log('dblclick body'); }
        }
    }
});

Defined By

Properties

 

The root node for this tree

The root node for this tree

Defined By

Methods

 
Tree( [Node root]) : void

 

Parameters

  • root : Node

    (optional) The root node

Returns

  • void   
 
addEvents( Object/String o, String ) : void

Adds the specified events to the list of events which this Observable may fire.

Adds the specified events to the list of events which this Observable may fire.

Parameters

  • o : Object/String

    Either an object with event names as properties with a value of true or the first event name string if multiple event names are being passed as separate parameters.

  • : String

    [additional] Optional additional event names if multiple event names are being passed as separate parameters. Usage:

    this.addEvents('storeloaded', 'storecleared');
    

Returns

  • void   
 
addListener( String eventName, Function handler, [Object scope], [Object options]) : void

Appends an event handler to this object.

Appends an event handler to this object.

Parameters

  • eventName : String

    The name of the event to listen for. May also be an object who's property names are event names. See

  • handler : Function

    The method the event invokes.

  • scope : Object

    (optional) The scope (this reference) in which the handler function is executed. If omitted, defaults to the object which fired the event.

  • options : Object

    (optional) An object containing handler configuration. properties. This may contain any of the following properties:

    • scope : Object
      The scope (this reference) in which the handler function is executed. If omitted, defaults to the object which fired the event.
    • delay : Number
      The number of milliseconds to delay the invocation of the handler after the event fires.
    • single : Boolean
      True to add a handler to handle just the next firing of the event, and then remove itself.
    • buffer : Number
      Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed by the specified number of milliseconds. If the event fires again within that time, the original handler is not invoked, but the new handler is scheduled in its place.
    • target : Observable
      Only call the handler if the event was fired on the target Observable, not if the event was bubbled up from a child Observable.
    • element : String
      This option is only valid for listeners bound to Components. The name of a Component property which references an element to add a listener to.

      This option is useful during Component construction to add DOM event listeners to elements of Components which will exist only after the Component is rendered. For example, to add a click listener to a Panel's body:

      new Ext.panel.Panel({
          title: 'The title',
          listeners: {
              click: this.handlePanelClick,
              element: 'body'
          }
      });
      

      When added in this way, the options available are the options applicable to Ext.core.Element.addListener


    Combining Options
    Using the options argument, it is possible to combine different types of listeners:

    A delayed, one-time listener.

    myPanel.on('hide', this.handleClick, this, {
    single: true,
    delay: 100
    });

    Attaching multiple handlers in 1 call
    The method also allows for a single argument to be passed which is a config object containing properties which specify multiple events. For example:

    myGridPanel.on({
        cellClick: this.onCellClick,
        mouseover: this.onMouseOver,
        mouseout: this.onMouseOut,
        scope: this // Important. Ensure "this" is correct during handler execution
    });
    
    .

Returns

  • void   
 
addManagedListener( Observable/Element item, Object/String ename, Function fn, Object scope, Object opt) : void

Adds listeners to any Observable object (or Element) which are automatically removed when this Component is destroyed.

Adds listeners to any Observable object (or Element) which are automatically removed when this Component is destroyed.

Parameters

  • item : Observable/Element

    The item to which to add a listener/listeners.

  • ename : Object/String

    The event name, or an object containing event name properties.

  • fn : Function

    Optional. If the ename parameter was an event name, this is the handler function.

  • scope : Object

    Optional. If the ename parameter was an event name, this is the scope (this reference) in which the handler function is executed.

  • opt : Object

    Optional. If the ename parameter was an event name, this is the addListener options.

Returns

  • void   
 
capture( Observable o, Function fn, [Object scope]) : void
Starts capture on the specified Observable. All events will be passed to the supplied function with the event name + ...

Starts capture on the specified Observable. All events will be passed to the supplied function with the event name + standard signature of the event before the event is fired. If the supplied function returns false, the event will not fire.

Parameters

  • o : Observable

    The Observable to capture events from.

  • fn : Function

    The function to call when an event is fired.

  • scope : Object

    (optional) The scope (this reference) in which the function is executed. Defaults to the Observable firing the event.

Returns

  • void   
 

Removes all listeners for this object including the managed listeners

Removes all listeners for this object including the managed listeners

Returns

  • void   
 

Removes all managed listeners for this object.

Removes all managed listeners for this object.

Returns

  • void   
 
enableBubble( String/Array events) : void
Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if present....

Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if present. There is no implementation in the Observable base class.

This is commonly used by Ext.Components to bubble events to owner Containers. See Ext.Component.getBubbleTarget. The default implementation in Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to access the required target more quickly.

Example:

Ext.override(Ext.form.field.Base, {
//  Add functionality to Field's initComponent to enable the change event to bubble
initComponent : Ext.Function.createSequence(Ext.form.field.Base.prototype.initComponent, function() {
    this.enableBubble('change');
}),

//  We know that we want Field's events to bubble directly to the FormPanel.
getBubbleTarget : function() {
    if (!this.formPanel) {
        this.formPanel = this.findParentByType('form');
    }
    return this.formPanel;
}
});

var myForm = new Ext.formPanel({
title: 'User Details',
items: [{
    ...
}],
listeners: {
    change: function() {
        // Title goes red if form has been modified.
        myForm.header.setStyle('color', 'red');
    }
}
});

Parameters

  • events : String/Array

    The event name to bubble, or an Array of event names.

Returns

  • void   
 
fireEvent( String eventName, Object... args) : Boolean
Fires the specified event with the passed parameters (minus the event name). An event may be set to bubble up an Ob...

Fires the specified event with the passed parameters (minus the event name).

An event may be set to bubble up an Observable parent hierarchy (See Ext.Component.getBubbleTarget) by calling enableBubble.

Parameters

  • eventName : String

    The name of the event to fire.

  • args : Object...

    Variable number of parameters are passed to handlers.

Returns

  • Boolean   

    returns false if any of the handlers return false otherwise it returns true.

 
getNodeById( String id) : Ext.data.NodeInterface

Gets a node in this tree by its id.

Gets a node in this tree by its id.

Parameters

  • id : String

Returns

  • Ext.data.NodeInterface   

    The match node.

 
getRootNode : Ext.data.NodeInterface

Returns the root node for this tree.

Returns the root node for this tree.

Returns

  • Ext.data.NodeInterface   
 
hasListener( String eventName) : Boolean

Checks to see if this object has any listeners for a specified event

Checks to see if this object has any listeners for a specified event

Parameters

  • eventName : String

    The name of the event to check for

Returns

  • Boolean   

    True if the event is being listened for, else false

 
observe( Function c, Object listeners) : void
Sets observability on the passed class constructor. This makes any event fired on any instance of the passed class a...

Sets observability on the passed class constructor.

This makes any event fired on any instance of the passed class also fire a single event through the class allowing for central handling of events on many instances at once.

Usage:

Ext.util.Observable.observe(Ext.data.Connection);
Ext.data.Connection.on('beforerequest', function(con, options) {
    console.log('Ajax request made to ' + options.url);
});

Parameters

  • c : Function

    The class constructor to make observable.

  • listeners : Object

    An object containing a series of listeners to add. See addListener.

Returns

  • void   
 
on( String eventName, Function handler, [Object scope], [Object options]) : void

Appends an event handler to this object (shorthand for addListener.)

Appends an event handler to this object (shorthand for addListener.)

Parameters

  • eventName : String

    The type of event to listen for

  • handler : Function

    The method the event invokes

  • scope : Object

    (optional) The scope (this reference) in which the handler function is executed. If omitted, defaults to the object which fired the event.

  • options : Object

    (optional) An object containing handler configuration.

Returns

  • void   
 
relayEvents( Object origin, Array events, Object prefix) : void

Relays selected events from the specified Observable as if the events were fired by this.

Relays selected events from the specified Observable as if the events were fired by this.

Parameters

  • origin : Object

    The Observable whose events this object is to relay.

  • events : Array

    Array of event names to relay.

  • prefix : Object

Returns

  • void   
 

Removes all added captures from the Observable.

Removes all added captures from the Observable.

Parameters

  • o : Observable

    The Observable to release

Returns

  • void   
 
removeListener( String eventName, Function handler, [Object scope]) : void

Removes an event handler.

Removes an event handler.

Parameters

  • eventName : String

    The type of event the handler was associated with.

  • handler : Function

    The handler to remove. This must be a reference to the function passed into the addListener call.

  • scope : Object

    (optional) The scope originally specified for the handler.

Returns

  • void   
 
removeManagedListener( Observable|Element item, Object|String ename, Function fn, Object scope) : void

Removes listeners that were added by the mon method.

Removes listeners that were added by the mon method.

Parameters

  • item : Observable|Element

    The item from which to remove a listener/listeners.

  • ename : Object|String

    The event name, or an object containing event name properties.

  • fn : Function

    Optional. If the ename parameter was an event name, this is the handler function.

  • scope : Object

    Optional. If the ename parameter was an event name, this is the scope (this reference) in which the handler function is executed.

Returns

  • void   
 
Resume firing events. (see suspendEvents) If events were suspended using the queueSuspended parameter, then all event...

Resume firing events. (see suspendEvents) If events were suspended using the queueSuspended parameter, then all events fired during event suspension will be sent to any listeners now.

Returns

  • void   
 
setRootNode( Ext.data.NodeInterface node) : Ext.data.NodeInterface

Sets the root node for this tree.

Sets the root node for this tree.

Parameters

  • node : Ext.data.NodeInterface

Returns

  • Ext.data.NodeInterface   

    The root node

 
suspendEvents( Boolean queueSuspended) : void

Suspend the firing of all events. (see resumeEvents)

Suspend the firing of all events. (see resumeEvents)

Parameters

  • queueSuspended : Boolean

    Pass as true to queue up suspended events to be fired after the resumeEvents call instead of discarding all suspended events;

Returns

  • void   
 
un( String eventName, Function handler, [Object scope]) : void

Removes an event handler (shorthand for removeListener.)

Removes an event handler (shorthand for removeListener.)

Parameters

  • eventName : String

    The type of event the handler was associated with.

  • handler : Function

    The handler to remove. This must be a reference to the function passed into the addListener call.

  • scope : Object

    (optional) The scope originally specified for the handler.

Returns

  • void   
Defined By

Events

 
append( Tree tree, Node parent, Node node, Number index)

Fires when a new child node is appended to a node in this tree.

Fires when a new child node is appended to a node in this tree.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The newly appended node

  • index : Number

    The index of the newly appended node

 
beforeappend( Tree tree, Node parent, Node node)

Fires before a new child is appended to a node in this tree, return false to cancel the append.

Fires before a new child is appended to a node in this tree, return false to cancel the append.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The child node to be appended

 

Fires before this node is collapsed.

Fires before this node is collapsed.

Parameters

  • this : Node

    The collapsing node

 

Fires before this node is expanded.

Fires before this node is expanded.

Parameters

  • this : Node

    The expanding node

 
beforeinsert( Tree tree, Node parent, Node node, Node refNode)

Fires before a new child is inserted in a node in this tree, return false to cancel the insert.

Fires before a new child is inserted in a node in this tree, return false to cancel the insert.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The child node to be inserted

  • refNode : Node

    The child node the node is being inserted before

 
beforemove( Tree tree, Node node, Node oldParent, Node newParent, Number index)

Fires before a node is moved to a new location in the tree. Return false to cancel the move.

Fires before a node is moved to a new location in the tree. Return false to cancel the move.

Parameters

  • tree : Tree

    The owner tree

  • node : Node

    The node being moved

  • oldParent : Node

    The parent of the node

  • newParent : Node

    The new parent the node is moving to

  • index : Number

    The index it is being moved to

 
beforeremove( Tree tree, Node parent, Node node)

Fires before a child is removed from a node in this tree, return false to cancel the remove.

Fires before a child is removed from a node in this tree, return false to cancel the remove.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The child node to be removed

 

Fires when this node is collapsed.

Fires when this node is collapsed.

Parameters

  • this : Node

    The collapsing node

 

Fires when this node is expanded.

Fires when this node is expanded.

Parameters

  • this : Node

    The expanding node

 
insert( Tree tree, Node parent, Node node, Node refNode)

Fires when a new child node is inserted in a node in this tree.

Fires when a new child node is inserted in a node in this tree.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The child node inserted

  • refNode : Node

    The child node the node was inserted before

 
move( Tree tree, Node node, Node oldParent, Node newParent, Number index)

Fires when a node is moved to a new location in the tree

Fires when a node is moved to a new location in the tree

Parameters

  • tree : Tree

    The owner tree

  • node : Node

    The node moved

  • oldParent : Node

    The old parent of this node

  • newParent : Node

    The new parent of this node

  • index : Number

    The index it was moved to

 
remove( Tree tree, Node parent, Node node)

Fires when a child node is removed from a node in this tree.

Fires when a child node is removed from a node in this tree.

Parameters

  • tree : Tree

    The owner tree

  • parent : Node

    The parent node

  • node : Node

    The child node removed

 
rootchange( Ext.data.Model root)

Fires whenever the root node is changed in the tree.

Fires whenever the root node is changed in the tree.

Parameters

  • root : Ext.data.Model

    The new root