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video.js/docs/api/vjs.TextTrack.md
Steve Heffernan 9e5dce5c14 Release 4.4.0
2014-02-18 13:43:40 -08:00

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vjs.TextTrack

EXTENDS: vjs.Component
DEFINED IN: src/js/tracks.js#L126

The base class for all text tracks

Handles the parsing, hiding, and showing of text track cues

INDEX

METHODS

activate()

Turn on cue tracking. Tracks that are showing OR hidden are active.

defined in: src/js/tracks.js#L385

activeCues()

Get the track active cues

RETURNS:
  • Array

defined in: src/js/tracks.js#L264

addChild( child, [options] )

Adds a child component inside this component

myComponent.el();
// -> <div class='my-component'></div>
myComonent.children();
// [empty array]

var myButton = myComponent.addChild('MyButton');
// -> <div class='my-component'><div class="my-button">myButton<div></div>
// -> myButton === myComonent.children()[0];

Pass in options for child constructors and options for children of the child

var myButton = myComponent.addChild('MyButton', {
  text: 'Press Me',
  children: {
    buttonChildExample: {
      buttonChildOption: true
    }
  }
});
PARAMETERS:
  • child String|vjs.Component The class name or instance of a child to add
  • options Object (OPTIONAL) Options, including options to be passed to children of the child.
RETURNS:
  • vjs.Component The child component (created by this process if a string was used)

inherited from: src/js/component.js#L347

addClass( classToAdd )

Add a CSS class name to the component's element

PARAMETERS:
  • classToAdd String Classname to add
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L632

adjustFontSize()

Change the font size of the text track to make it larger when playing in fullscreen mode and restore it to its normal size when not in fullscreen mode.

defined in: src/js/tracks.js#L309

buildCSSClass()

Allows sub components to stack CSS class names

RETURNS:
  • String The constructed class name

inherited from: src/js/component.js#L475

children()

Get an array of all child components

var kids = myComponent.children();
RETURNS:
  • Array The children

inherited from: src/js/component.js#L281

contentEl()

Return the component's DOM element for embedding content. Will either be el_ or a new element defined in createEl.

RETURNS:
  • Element

inherited from: src/js/component.js#L224

createEl()

Create basic div to hold cue text

RETURNS:
  • Element

defined in: src/js/tracks.js#L325

cues()

Get the track cues

RETURNS:
  • Array

defined in: src/js/tracks.js#L249

deactivate()

Turn off cue tracking.

defined in: src/js/tracks.js#L408

dflt()

Get the track default value. ('default' is a reserved keyword)

RETURNS:
  • Boolean

defined in: src/js/tracks.js#L190

dimensions( width, height )

Set both width and height at the same time

PARAMETERS:
  • width Number|String
  • height Number|String
RETURNS:
  • vjs.Component The component

inherited from: src/js/component.js#L744

disable()

Disable: Mode Off/Disable (0) Indicates that the text track is not active. Other than for the purposes of exposing the track in the DOM, the user agent is ignoring the text track. No cues are active, no events are fired, and the user agent will not attempt to obtain the track's cues.

defined in: src/js/tracks.js#L371

dispose()

Dispose of the component and all child components

inherited from: src/js/component.js#L78

el()

Get the component's DOM element

var domEl = myComponent.el();
RETURNS:
  • Element

inherited from: src/js/component.js#L205

enableTouchActivity()

Report user touch activity when touch events occur

User activity is used to determine when controls should show/hide. It's relatively simple when it comes to mouse events, because any mouse event should show the controls. So we capture mouse events that bubble up to the player and report activity when that happens.

With touch events it isn't as easy. We can't rely on touch events at the player level, because a tap (touchstart + touchend) on the video itself on mobile devices is meant to turn controls off (and on). User activity is checked asynchronously, so what could happen is a tap event on the video turns the controls off, then the touchend event bubbles up to the player, which if it reported user activity, would turn the controls right back on. (We also don't want to completely block touch events from bubbling up)

Also a touchmove, touch+hold, and anything other than a tap is not supposed to turn the controls back on on a mobile device.

Here we're setting the default component behavior to report user activity whenever touch events happen, and this can be turned off by components that want touch events to act differently.

inherited from: src/js/component.js#L897

getChild( name )

Returns a child component with the provided name

PARAMETERS:
  • name
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L315

getChildById( id )

Returns a child component with the provided ID

PARAMETERS:
  • id
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L298

height( [num], [skipListeners] )

Get or set the height of the component (CSS values)

Setting the video tag dimension values only works with values in pixels. Percent values will not work. Some percents can be used, but width()/height() will return the number + %, not the actual computed width/height.

PARAMETERS:
  • num Number|String (OPTIONAL) New component height
  • skipListeners Boolean (OPTIONAL) Skip the resize event trigger
RETURNS:
  • vjs.Component This component, when setting the height
  • Number|String The height, when getting

inherited from: src/js/component.js#L733

hide()

Hide: Mode Hidden (1) Indicates that the text track is active, but that the user agent is not actively displaying the cues. If no attempt has yet been made to obtain the track's cues, the user agent will perform such an attempt momentarily. The user agent is maintaining a list of which cues are active, and events are being fired accordingly.

defined in: src/js/tracks.js#L356

id()

Get the component's ID

var id = myComponent.id();
RETURNS:
  • String

inherited from: src/js/component.js#L243

init( player, options )

PARAMETERS:
  • player
  • options

defined in: src/js/tracks.js#L128

initChildren()

Add and initialize default child components from options

// when an instance of MyComponent is created, all children in options
// will be added to the instance by their name strings and options
MyComponent.prototype.options_.children = {
  myChildComponent: {
    myChildOption: true
  }
}

inherited from: src/js/component.js#L443

kind()

Get the track kind value

RETURNS:
  • String

defined in: src/js/tracks.js#L161

label()

Get the track label value

RETURNS:
  • String

defined in: src/js/tracks.js#L234

language()

Get the track language value

RETURNS:
  • String

defined in: src/js/tracks.js#L219

mode()

Get the track mode

RETURNS:
  • Number

defined in: src/js/tracks.js#L301

name()

Get the component's name. The name is often used to reference the component.

var name = myComponent.name();
RETURNS:
  • String

inherited from: src/js/component.js#L262

off( [type], [fn] )

Remove an event listener from the component's element

myComponent.off("eventName", myFunc);
PARAMETERS:
  • type String (OPTIONAL) Event type. Without type it will remove all listeners.
  • fn Function (OPTIONAL) Event listener. Without fn it will remove all listeners for a type.
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L514

on( type, fn )

Add an event listener to this component's element

var myFunc = function(){
  var myPlayer = this;
  // Do something when the event is fired
};

myPlayer.on("eventName", myFunc);

The context will be the component.

PARAMETERS:
  • type String The event type e.g. 'click'
  • fn Function The event listener
RETURNS:
  • vjs.Component self

inherited from: src/js/component.js#L500

one( type, fn )

Add an event listener to be triggered only once and then removed

PARAMETERS:
  • type String Event type
  • fn Function Event listener
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L526

options( obj )

Deep merge of options objects

Whenever a property is an object on both options objects the two properties will be merged using vjs.obj.deepMerge.

This is used for merging options for child components. We want it to be easy to override individual options on a child component without having to rewrite all the other default options.

Parent.prototype.options_ = {
  children: {
    'childOne': { 'foo': 'bar', 'asdf': 'fdsa' },
    'childTwo': {},
    'childThree': {}
  }
}
newOptions = {
  children: {
    'childOne': { 'foo': 'baz', 'abc': '123' }
    'childTwo': null,
    'childFour': {}
  }
}

this.options(newOptions);

RESULT

{
  children: {
    'childOne': { 'foo': 'baz', 'asdf': 'fdsa', 'abc': '123' },
    'childTwo': null, // Disabled. Won't be initialized.
    'childThree': {},
    'childFour': {}
  }
}
PARAMETERS:
  • obj Object Object of new option values
RETURNS:
  • Object A NEW object of this.options_ and obj merged

inherited from: src/js/component.js#L173

player()

Return the component's player

RETURNS:
  • vjs.Player

inherited from: src/js/component.js#L120

ready( fn )

Bind a listener to the component's ready state

Different from event listeners in that if the ready event has already happend it will trigger the function immediately.

PARAMETERS:
  • fn Function Ready listener
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L585

readyState()

Get the track readyState

RETURNS:
  • Number

defined in: src/js/tracks.js#L283

removeChild( component )

Remove a child component from this component's list of children, and the child component's element from this component's element

PARAMETERS:
  • component vjs.Component Component to remove

inherited from: src/js/component.js#L405

removeClass( classToRemove )

Remove a CSS class name from the component's element

PARAMETERS:
  • classToRemove String Classname to remove
RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L643

show()

Show: Mode Showing (2) Indicates that the text track is active. If no attempt has yet been made to obtain the track's cues, the user agent will perform such an attempt momentarily. The user agent is maintaining a list of which cues are active, and events are being fired accordingly. In addition, for text tracks whose kind is subtitles or captions, the cues are being displayed over the video as appropriate; for text tracks whose kind is descriptions, the user agent is making the cues available to the user in a non-visual fashion; and for text tracks whose kind is chapters, the user agent is making available to the user a mechanism by which the user can navigate to any point in the media resource by selecting a cue. The showing by default state is used in conjunction with the default attribute on track elements to indicate that the text track was enabled due to that attribute. This allows the user agent to override the state if a later track is discovered that is more appropriate per the user's preferences.

defined in: src/js/tracks.js#L341

src()

Get the track src value

RETURNS:
  • String

defined in: src/js/tracks.js#L175

title()

Get the track title value

RETURNS:
  • String

defined in: src/js/tracks.js#L204

trigger( type, event )

Trigger an event on an element

myComponent.trigger('eventName');
PARAMETERS:
  • type String The event type to trigger, e.g. 'click'
  • event Event|Object The event object to be passed to the listener
RETURNS:
  • vjs.Component self

inherited from: src/js/component.js#L540

triggerReady()

Trigger the ready listeners

RETURNS:
  • vjs.Component

inherited from: src/js/component.js#L604

width( [num], skipListeners )

Set or get the width of the component (CSS values)

Setting the video tag dimension values only works with values in pixels. Percent values will not work. Some percents can be used, but width()/height() will return the number + %, not the actual computed width/height.

PARAMETERS:
  • num Number|String (OPTIONAL) Optional width number
  • skipListeners Boolean Skip the 'resize' event trigger
RETURNS:
  • vjs.Component This component, when setting the width
  • Number|String The width, when getting

inherited from: src/js/component.js#L716

EVENTS

resize EVENT

Fired when the width and/or height of the component changes

inherited from: src/js/component.js#L823