Subclasses
Ext.Component
Ext.Direct
Ext.History
Ext.Resizable
Ext.SplitBar
Ext.Updater
Ext.data.Connection
Ext.data.DataProxy
Ext.data.Node
Ext.data.Store
Ext.data.Tree
Ext.dd.DragTracker
Ext.direct.Provider
Ext.form.BasicForm
Ext.grid.AbstractSelectionModel
Ext.grid.Column
Ext.grid.ColumnModel
Ext.grid.GridView
Ext.grid.PropertyStore
Ext.list.ColumnResizer
Ext.list.Sorter
Ext.state.Provider
Ext.tree.DefaultSelectionModel
Ext.tree.MultiSelectionModel
Ext.tree.TreeLoader
Ext.util.ClickRepeater
Ext.util.MixedCollection
Files
Observable.js
Observable-more.js

Base class that provides a common interface for publishing events. Subclasses are expected to\nto have a property \"events\" with all the events defined, and, optionally, a property \"listeners\"\nwith configured listeners defined.
\nFor example:

\n\n

Employee = Ext.extend(Ext.util.Observable, {\n    constructor: function(config){\n        this.name = config.name;\n        this.addEvents({\n            \"fired\" : true,\n            \"quit\" : true\n        });\n\n        // Copy configured listeners into *this* object so that the base class's\n        // constructor will add them.\n        this.listeners = config.listeners;\n\n        // Call our superclass constructor to complete construction process.\n        Employee.superclass.constructor.call(this, config)\n    }\n});\n

\n\n\n

This could then be used like this:

\n\n

var newEmployee = new Employee({\n    name: employeeName,\n    listeners: {\n        quit: function() {\n            // By default, \"this\" will be the object that fired the event.\n            alert(this.name + \" has quit!\");\n        }\n    }\n});\n

\n\n

Defined By

Config options

Ext.util.Observable
view source

listeners : Object

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

(optional)

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

\n\n

DOM events from ExtJs Components

\n\n\n

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

is usually only done when extra value can be added. For example the DataView's\nclick event passing the node clicked on. To access DOM\nevents directly from a Component's HTMLElement, listeners must be added to the Element after the Component\nhas been rendered. A plugin can simplify this step:

\n\n

// Plugin is configured with a listeners config object.\n// The Component is appended to the argument list of all handler functions.\nExt.DomObserver = Ext.extend(Object, {\n    constructor: function(config) {\n        this.listeners = config.listeners ? config.listeners : config;\n    },\n\n    // Component passes itself into plugin's init method\n    init: function(c) {\n        var p, l = this.listeners;\n        for (p in l) {\n            if (Ext.isFunction(l[p])) {\n                l[p] = this.createHandler(l[p], c);\n            } else {\n                l[p].fn = this.createHandler(l[p].fn, c);\n            }\n        }\n\n        // Add the listeners to the Element immediately following the render call\n        c.render = c.render.createSequence(function() {\n            var e = c.getEl();\n            if (e) {\n                e.on(l);\n            }\n        });\n    },\n\n    createHandler: function(fn, c) {\n        return function(e) {\n            fn.call(this, e, c);\n        };\n    }\n});\n\nvar combo = new Ext.form.ComboBox({\n\n    // Collapse combo when its element is clicked on\n    plugins: [ new Ext.DomObserver({\n        click: function(evt, comp) {\n            comp.collapse();\n        }\n    })],\n    store: myStore,\n    typeAhead: true,\n    mode: 'local',\n    triggerAction: 'all'\n});\n

\n\n\n

Methods

Defined By

Instance Methods

Ext.util.Observable
view source

addEvents( o, Optional )

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\nor the first event name string if multiple event names are being passed as separate parameters.
\n
Optional : string
. Event name if multiple event names are being passed as separate parameters.\nUsage:
\n\n
```
this.addEvents('storeloaded', 'storecleared');\n
```
\n\n

Ext.util.Observable
view source

addListener( eventName, handler, [scope], [options] )

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.
\n
handler : Function
The method the event invokes.
\n
scope : Object (optional)
The scope (this reference) in which the handler function is executed.\nIf omitted, defaults to the object which fired the event.
\n
options : Object (optional)
An object containing handler configuration.\nproperties. This may contain any of the following properties:
- scope : Object
  The scope (this reference) in which the handler function is executed.\nIf 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\nby the specified number of milliseconds. If the event fires again within that time, the original\nhandler 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\nif the event was bubbled up from a child Observable.
\n\n
\nCombining Options
\nUsing the options argument, it is possible to combine different types of listeners:
\n
\nA delayed, one-time listener.\n
```
myDataView.on('click', this.onClick, this, {\nsingle: true,\ndelay: 100\n});
```
\n
\nAttaching multiple handlers in 1 call
\nThe method also allows for a single argument to be passed which is a config object containing properties\nwhich specify multiple handlers.\n
\n
```
myGridPanel.on({\n'click' : {\n    fn: this.onClick,\n    scope: this,\n    delay: 100\n},\n'mouseover' : {\n    fn: this.onMouseOver,\n    scope: this\n},\n'mouseout' : {\n    fn: this.onMouseOut,\n    scope: this\n}\n});
```
\n
\nOr a shorthand syntax:
\n
```
myGridPanel.on({\n'click' : this.onClick,\n'mouseover' : this.onMouseOver,\n'mouseout' : this.onMouseOut,\n scope: this\n});
```
\n\n

Ext.util.Observable
view source

enableBubble( events )

Enables events fired by this Observable to bubble up an owner hierarchy by calling\nthis.getBubbleTarget() if present. ...

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

\n\n\n

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

\n\n\n

Example:

\n\n\n

Ext.override(Ext.form.Field, {\n    //  Add functionality to Field's initComponent to enable the change event to bubble\n    initComponent : Ext.form.Field.prototype.initComponent.createSequence(function() {\n        this.enableBubble('change');\n    }),\n\n    //  We know that we want Field's events to bubble directly to the FormPanel.\n    getBubbleTarget : function() {\n        if (!this.formPanel) {\n            this.formPanel = this.findParentByType('form');\n        }\n        return this.formPanel;\n    }\n});\n\nvar myForm = new Ext.formPanel({\n    title: 'User Details',\n    items: [{\n        ...\n    }],\n    listeners: {\n        change: function() {\n            // Title goes red if form has been modified.\n            myForm.header.setStyle('color', 'red');\n        }\n    }\n});\n

\n\n

Parameters

events : String/Array
The event name to bubble, or an Array of event names.
\n

Ext.util.Observable
view source

fireEvent( eventName, args ) : Boolean

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

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

\n\n\n

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

\n\n

Parameters

eventName : String
The name of the event to fire.
\n
args : Object...
Variable number of parameters are passed to handlers.
\n

Returns

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

Ext.util.Observable
view source

hasListener( 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
\n

Returns

Boolean
True if the event is being listened for, else false
\n

Ext.util.Observable
view source

on( eventName, handler, [scope], [options] )

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
\n
handler : Function
The method the event invokes
\n
scope : Object (optional)
The scope (this reference) in which the handler function is executed.\nIf omitted, defaults to the object which fired the event.
\n
options : Object (optional)
An object containing handler configuration.
\n

Ext.util.Observable
view source

purgeListeners( )

Removes all listeners for this object ...

Removes all listeners for this object

Ext.util.Observable
view source

relayEvents( o, events )

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

o : Object
The Observable whose events this object is to relay.
\n
events : Array
Array of event names to relay.
\n

Ext.util.Observable
view source

removeListener( eventName, handler, [scope] )

Removes an event handler. ...

Removes an event handler.

Parameters

eventName : String
The type of event the handler was associated with.
\n
handler : Function
The handler to remove. This must be a reference to the function passed into the addListener call.
\n
scope : Object (optional)
The scope originally specified for the handler.
\n

Ext.util.Observable
view source

resumeEvents( )

Resume firing events. ...

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

Ext.util.Observable
view source

suspendEvents( queueSuspended )

Suspend the firing of all events. ...

Suspend the firing of all events. (see resumeEvents)

Parameters

queueSuspended : Boolean
Pass as true to queue up suspended events to be fired\nafter the resumeEvents call instead of discarding all suspended events;
\n

Ext.util.Observable
view source

un( eventName, handler, [scope] )

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.
\n
handler : Function
The handler to remove. This must be a reference to the function passed into the addListener call.
\n
scope : Object (optional)
The scope originally specified for the handler.
\n

Defined By

Static Methods

Ext.util.Observable
view source

capture( o, fn, [scope] )static

Starts capture on the specified Observable. ...

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

Parameters

o : Observable
The Observable to capture events from.
\n
fn : Function
The function to call when an event is fired.
\n
scope : Object (optional)
The scope (this reference) in which the function is executed. Defaults to the Observable firing the event.
\n

Ext.util.Observable
view source

observeClass( c, listeners )static

Sets observability on the passed class constructor. ...

Sets observability on the passed class constructor.

\n\n

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

\n\n\n

Usage:

\n\n\n

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

\n\n

Parameters

c : Function
The class constructor to make observable.
\n
listeners : Object
An object containing a series of listeners to add. See addListener.
\n

Ext.util.Observable
view source

releaseCapture( o )static

Removes all added captures from the Observable. ...

Removes all added captures from the Observable.

Parameters

o : Observable
The Observable to release
\n