DescriptionsButton

The button component for toggling and selecting descriptions

Constructor

new DescriptionsButton(player, optionsopt, readyopt)

Creates an instance of this class.

Parameters:
NameTypeAttributesDescription
playerdefault

The Player that this class should be attached to.

optionsObject<optional>

The key/value store of player options.

readyfunction<optional>

The function to call when this component is ready.

Extends

Members

(protected) controlText_ :string

The text that should display over the DescriptionsButtons controls. Added for localization.

Type:
  • string

(protected) hideThreshold_ :Number

Hide the menu if the number of items is less than or equal to this threshold. This defaults to 0 and whenever we add items which can be hidden to the menu we'll increment it. We list it here because every time we run createMenu we need to reset the value.

Type:
  • Number

Methods

$(selector, contextopt) → {Element|null}

Find a single DOM element matching a selector. This can be within the Components contentEl() or another custom context.

Parameters:
NameTypeAttributesDefaultDescription
selectorstring

A valid CSS selector, which will be passed to querySelector.

contextElement | string<optional>
this.contentEl()

A DOM element within which to query. Can also be a selector string in which case the first matching element will get used as context. If missing this.contentEl() gets used. If this.contentEl() returns nothing it falls back to document.

Returns:

the dom element that was found, or null

Type: 
Element | null

$$(selector, contextopt) → {NodeList}

Finds all DOM element matching a selector. This can be within the Components contentEl() or another custom context.

Parameters:
NameTypeAttributesDefaultDescription
selectorstring

A valid CSS selector, which will be passed to querySelectorAll.

contextElement | string<optional>
this.contentEl()

A DOM element within which to query. Can also be a selector string in which case the first matching element will get used as context. If missing this.contentEl() gets used. If this.contentEl() returns nothing it falls back to document.

Returns:

a list of dom elements that were found

Type: 
NodeList

addChild(child, optionsopt, indexopt) → {Component}

Add a child Component inside the current Component.

Parameters:
NameTypeAttributesDefaultDescription
childstring | Component

The name or instance of a child to add.

optionsObject<optional>
{}

The key/value store of options that will get passed to children of the child.

indexnumber<optional>
this.children_.length

The index to attempt to add a child into.

Returns:

The Component that gets added as a child. When using a string the Component will get created by this process.

Type: 
Component

addClass(…classesToAdd)

Add a CSS class name to the Components element.

Parameters:
NameTypeAttributesDescription
classesToAddstring<repeatable>

One or more CSS class name to add.

any(type, fn)

This function will add an event listener that gets triggered only once and is removed from all events. This is like adding an array of event listeners with EventTarget#on that calls EventTarget#off on all events the first time it is triggered.

Parameters:
NameTypeDescription
typestring | Array.<string>

An event name or an array of event names.

fnfunction

The function to be called once for each event name.

blur()

Remove the focus from the actual button, not this element

buildCSSClass() → {string}

Builds the default DOM className.

Returns:

The DOM className for this object.

Type: 
string

buildWrapperCSSClass() → {string}

Allow sub components to stack CSS class names for the wrapper element

Returns:

The constructed wrapper DOM className

Type: 
string

cancelAnimationFrame(id) → {number}

Cancels a queued callback passed to Component#requestAnimationFrame (rAF).

If you queue an rAF callback via Component#requestAnimationFrame, use this function instead of window.cancelAnimationFrame. If you don't, your dispose listener will not get cleaned up until Component#dispose!

Parameters:
NameTypeDescription
idnumber

The rAF ID to clear. The return value of Component#requestAnimationFrame.

Returns:

Returns the rAF ID that was cleared.

Type: 
number

cancelNamedAnimationFrame(name)

Cancels a current named animation frame if it exists.

Parameters:
NameTypeDescription
namestring

The name of the requestAnimationFrame to cancel.

children() → {Array}

Get an array of all child components

Returns:

The children

Type: 
Array

clearInterval(intervalId) → {number}

Clears an interval that gets created via window.setInterval or Component#setInterval. If you set an interval via Component#setInterval use this function instead of window.clearInterval. If you don't your dispose listener will not get cleaned up until Component#dispose!

Parameters:
NameTypeDescription
intervalIdnumber

The id of the interval to clear. The return value of Component#setInterval or window.setInterval.

Returns:

Returns the interval id that was cleared.

Type: 
number

clearTimeout(timeoutId) → {number}

Clears a timeout that gets created via window.setTimeout or Component#setTimeout. If you set a timeout via Component#setTimeout use this function instead of window.clearTimout. If you don't your dispose listener will not get cleaned up until Component#dispose!

Parameters:
NameTypeDescription
timeoutIdnumber

The id of the timeout to clear. The return value of Component#setTimeout or window.setTimeout.

Returns:

Returns the timeout id that was cleared.

Type: 
number

contentEl() → {Element}

Return the Components DOM element. This is where children get inserted. This will usually be the the same as the element returned in Component#el.

Returns:

The content element for this Component.

Type: 
Element

controlText(textopt, elopt) → {string}

Get or set the localized control text that will be used for accessibility.

NOTE: This will come from the internal menuButton_ element.

Parameters:
NameTypeAttributesDefaultDescription
textstring<optional>

Control text for element.

elElement<optional>
this.menuButton_.el()

Element to set the title on.

Returns:
  • The control text when getting
Type: 
string

createEl() → {Element}

Create the MenuButtonss DOM element.

Returns:

The element that gets created.

Type: 
Element

createItems(itemsopt) → {Array.<TextTrackMenuItem>}

Create a menu item for each text track

Parameters:
NameTypeAttributesDefaultDescription
itemsArray.<TextTrackMenuItem><optional>
[]

Existing array of items to use during creation

Returns:

Array of menu items that were created

Type: 
Array.<TextTrackMenuItem>

createMenu() → {Menu}

Create the menu and add all items to it.

Returns:

The constructed menu

Type: 
Menu

currentDimension(widthOrHeight) → {number}

Get the computed width or the height of the component's element.

Uses window.getComputedStyle.

Parameters:
NameTypeDescription
widthOrHeightstring

A string containing 'width' or 'height'. Whichever one you want to get.

Returns:

The dimension that gets asked for or 0 if nothing was set for that dimension.

Type: 
number

currentDimensions() → {Component~DimensionObject}

Get an object that contains computed width and height values of the component's element.

Uses window.getComputedStyle.

Returns:

The computed dimensions of the component's element.

Type: 
Component~DimensionObject

currentHeight() → {number}

Get the computed height of the component's element.

Uses window.getComputedStyle.

Returns:

The computed height of the component's element.

Type: 
number

currentWidth() → {number}

Get the computed width of the component's element.

Uses window.getComputedStyle.

Returns:

The computed width of the component's element.

Type: 
number

dimension(widthOrHeight, numopt, skipListenersopt) → {number|undefined}

Get or set width or height of the Component element. This is the shared code for the Component#width and Component#height.

Things to know:

  • If the width or height in an number this will return the number postfixed with 'px'.
  • If the width/height is a percent this will return the percent postfixed with '%'
  • Hidden elements have a width of 0 with window.getComputedStyle. This function defaults to the Components style.width and falls back to window.getComputedStyle. See this for more information
  • If you want the computed style of the component, use Component#currentWidth and {Component#currentHeight
Parameters:
NameTypeAttributesDescription
widthOrHeightstring

8 'width' or 'height'

numnumber | string<optional>

8 New dimension

skipListenersboolean<optional>

Skip componentresize event trigger

Returns:

The dimension when getting or 0 if unset

Type: 
number | undefined

dimensions(width, height)

Set both the width and height of the Component element at the same time.

Parameters:
NameTypeDescription
widthnumber | string

Width to set the Components element to.

heightnumber | string

Height to set the Components element to.

disable()

Disable the MenuButton. Don't allow it to be clicked.

dispose()

Dispose of the menu-button and all child components.

el() → {Element}

Get the Components DOM element

Returns:

The DOM element for this Component.

Type: 
Element

(protected) emitTapEvents()

Emit a 'tap' events when touch event support gets detected. This gets used to support toggling the controls through a tap on the video. They get enabled because every sub-component would have extra overhead otherwise.

Listens to Events:
  • Component#event:touchstart
  • Component#event:touchmove
  • Component#event:touchleave
  • Component#event:touchcancel
  • Component#event:touchend

enable()

Enable the MenuButton. Allow it to be clicked.

enableTouchActivity()

This function reports user activity whenever touch events happen. This can get turned off by any sub-components that wants touch events to act another way.

Report user touch activity when touch events occur. User activity gets used to determine when controls should show/hide. It is 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 as touchstart and touchend toggle player controls. So touch events can't help us at the player level either.

User activity gets 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. Furthermore a touchmove event and anything other than a tap, should not turn controls back on.

Listens to Events:
  • Component#event:touchstart
  • Component#event:touchmove
  • Component#event:touchend
  • Component#event:touchcancel

focus()

Set the focus to the actual button, not to this element

getAttribute(attribute) → {string|null}

Get the value of an attribute on the Components element.

Parameters:
NameTypeDescription
attributestring

Name of the attribute to get the value from.

Returns:
  • The value of the attribute that was asked for. - Can be an empty string on some browsers if the attribute does not exist or has no value - Most browsers will return null if the attribute does not exist or has no value.
Type: 
string | null

getChild(name) → {Component|undefined}

Returns the child Component with the given name.

Parameters:
NameTypeDescription
namestring

The name of the child Component to get.

Returns:

The child Component with the given name or undefined.

Type: 
Component | undefined

getChildById(id) → {Component|undefined}

Returns the child Component with the given id.

Parameters:
NameTypeDescription
idstring

The id of the child Component to get.

Returns:

The child Component with the given id or undefined.

Type: 
Component | undefined

getDescendant(…names) → {Component|undefined}

Returns the descendant Component following the givent descendant names. For instance ['foo', 'bar', 'baz'] would try to get 'foo' on the current component, 'bar' on the 'foo' component and 'baz' on the 'bar' component and return undefined if any of those don't exist.

Parameters:
NameTypeAttributesDescription
names...Array.<string> | string<repeatable>

The name of the child Component to get.

Returns:

The descendant Component following the given descendant names or undefined.

Type: 
Component | undefined

handleClick(event)

Handle a click on a MenuButton. See ClickableComponent#handleClick for instances where this is called.

Parameters:
NameTypeDescription
eventEvent

The keydown, tap, or click event that caused this function to be called.

Listens to Events:
  • event:tap
  • event:click

handleKeyDown(event)

Handle tab, escape, down arrow, and up arrow keys for MenuButton. See ClickableComponent#handleKeyDown for instances where this is called.

Parameters:
NameTypeDescription
eventEvent

The keydown event that caused this function to be called.

Listens to Events:
  • event:keydown

handleKeyPress(event)

Many components used to have a handleKeyPress method, which was poorly named because it listened to a keydown event. This method name now delegates to handleKeyDown. This means anyone calling handleKeyPress will not see their method calls stop working.

Parameters:
NameTypeDescription
eventKeyboardEvent

The event that caused this function to be called.

(abstract) handleLanguagechange()

Handles language change for the player in components. Should be overridden by sub-components.

handleMenuKeyUp(event)

Handle a keyup event on a MenuButton. The listener for this is added in the constructor.

Parameters:
NameTypeDescription
eventEvent

Key press event

Listens to Events:
  • event:keyup

handleMouseLeave(event)

Handle mouseleave for MenuButton.

Parameters:
NameTypeDescription
eventEvent

The mouseleave event that caused this function to be called.

Listens to Events:
  • event:mouseleave

handleSubmenuKeyDown(event)

Handle a keydown event on a sub-menu. The listener for this is added in the constructor.

Parameters:
NameTypeDescription
eventEvent

Key press event

Listens to Events:
  • event:keydown

handleSubmenuKeyPress(event)

This method name now delegates to handleSubmenuKeyDown. This means anyone calling handleSubmenuKeyPress will not see their method calls stop working.

Parameters:
NameTypeDescription
eventEvent

The event that caused this function to be called.

handleTracksChange(event)

Handle text track change

Parameters:
NameTypeDescription
eventEvent

The event that caused this function to run

Listens to Events:

hasClass(classToCheck) → {boolean}

Check if a component's element has a CSS class name.

Parameters:
NameTypeDescription
classToCheckstring

CSS class name to check.

Returns:
  • True if the Component has the class. - False if the Component does not have the class`
Type: 
boolean

height(numopt, skipListenersopt) → {number|undefined}

Get or set the height of the component based upon the CSS styles. See Component#dimension for more detailed information.

Parameters:
NameTypeAttributesDescription
numnumber | string<optional>

The height that you want to set postfixed with '%', 'px' or nothing.

skipListenersboolean<optional>

Skip the componentresize event trigger

Returns:

The height when getting, zero if there is no height

Type: 
number | undefined

hide()

Hide the Components element if it is currently showing by adding the 'vjs-hidden` class name to it.

id() → {string}

Get this Components ID

Returns:

The id of this Component

Type: 
string

initChildren()

Add and initialize default child Components based upon options.

isDisposed() → {boolean}

Determine whether or not this component has been disposed.

Returns:

If the component has been disposed, will be true. Otherwise, false.

Type: 
boolean

localize(string, tokensopt, defaultValueopt) → {string}

Localize a string given the string in english.

If tokens are provided, it'll try and run a simple token replacement on the provided string. The tokens it looks for look like {1} with the index being 1-indexed into the tokens array.

If a defaultValue is provided, it'll use that over string, if a value isn't found in provided language files. This is useful if you want to have a descriptive key for token replacement but have a succinct localized string and not require en.json to be included.

Currently, it is used for the progress bar timing.

{
  "progress bar timing: currentTime={1} duration={2}": "{1} of {2}"
}

It is then used like so:

this.localize('progress bar timing: currentTime={1} duration{2}',
              [this.player_.currentTime(), this.player_.duration()],
              '{1} of {2}');

Which outputs something like: 01:23 of 24:56.

Parameters:
NameTypeAttributesDescription
stringstring

The string to localize and the key to lookup in the language files.

tokensArray.<string><optional>

If the current item has token replacements, provide the tokens here.

defaultValuestring<optional>

Defaults to string. Can be a default value to use for token replacement if the lookup key is needed to be separate.

Returns:

The localized string or if no localization exists the english string.

Type: 
string

name() → {string}

Get the Components name. The name gets used to reference the Component and is set during registration.

Returns:

The name of this Component.

Type: 
string

off(type, fnopt)

Removes an event listener for a specific event from an instance of EventTarget. This makes it so that the event listener will no longer get called when the named event happens.

Parameters:
NameTypeAttributesDescription
typestring | Array.<string>

An event name or an array of event names.

fnfunction<optional>

The function to remove. If not specified, all listeners managed by Video.js will be removed.

on(type, fn)

Adds an event listener to an instance of an EventTarget. An event listener is a function that will get called when an event with a certain name gets triggered.

Parameters:
NameTypeDescription
typestring | Array.<string>

An event name or an array of event names.

fnfunction

The function to call with EventTargets

one(type, fn)

This function will add an event listener that gets triggered only once. After the first trigger it will get removed. This is like adding an event listener with EventTarget#on that calls EventTarget#off on itself.

Parameters:
NameTypeDescription
typestring | Array.<string>

An event name or an array of event names.

fnfunction

The function to be called once for each event name.

options(obj) → {Object}

Deep merge of options objects with new options.

Note: When both obj and options contain properties whose values are objects. The two properties get merged using module:obj.merge

Parameters:
NameTypeDescription
objObject

The object that contains new options.

Returns:

A new object of this.options_ and obj merged together.

Type: 
Object

player() → {default}

Return the Player that the Component has attached to.

Returns:

The player that this Component has attached to.

Type: 
default

pressButton()

Put the current MenuButton into a pressed state.

ready(fn) → {Component}

Bind a listener to the component's ready state. Different from event listeners in that if the ready event has already happened it will trigger the function immediately.

Parameters:
NameTypeDescription
fnReadyCallback

Function that gets called when the Component is ready.

Returns:

Returns itself; method can be chained.

Type: 
Component

removeAttribute(attribute)

Remove an attribute from the Components element.

Parameters:
NameTypeDescription
attributestring

Name of the attribute to remove.

removeChild(component)

Remove a child Component from this Components list of children. Also removes the child Components element from this Components element.

Parameters:
NameTypeDescription
componentComponent

The child Component to remove.

removeClass(…classesToRemove)

Remove a CSS class name from the Components element.

Parameters:
NameTypeAttributesDescription
classesToRemovestring<repeatable>

One or more CSS class name to remove.

requestAnimationFrame(fn) → {number}

Queues up a callback to be passed to requestAnimationFrame (rAF), but with a few extra bonuses:

  • Supports browsers that do not support rAF by falling back to Component#setTimeout.

  • The callback is turned into a Component~GenericCallback (i.e. bound to the component).

  • Automatic cancellation of the rAF callback is handled if the component is disposed before it is called.

Parameters:
NameTypeDescription
fnComponent~GenericCallback

A function that will be bound to this component and executed just before the browser's next repaint.

Listens to Events:
Returns:

Returns an rAF ID that gets used to identify the timeout. It can also be used in Component#cancelAnimationFrame to cancel the animation frame callback.

Type: 
number

requestNamedAnimationFrame(name, fn)

Request an animation frame, but only one named animation frame will be queued. Another will never be added until the previous one finishes.

Parameters:
NameTypeDescription
namestring

The name to give this requestAnimationFrame

fnComponent~GenericCallback

A function that will be bound to this component and executed just before the browser's next repaint.

setAttribute(attribute, value)

Set the value of an attribute on the Component's element

Parameters:
NameTypeDescription
attributestring

Name of the attribute to set.

valuestring

Value to set the attribute to.

setIcon(name)

Overwrites the setIcon method from Component. In this case, we want the icon to be appended to the menuButton.

Parameters:
NameTypeDescription
namestring

The icon name to be added.

setInterval(fn, interval) → {number}

Creates a function that gets run every x milliseconds. This function is a wrapper around window.setInterval. There are a few reasons to use this one instead though.

  1. It gets cleared via Component#clearInterval when Component#dispose gets called.
  2. The function callback will be a Component~GenericCallback
Parameters:
NameTypeDescription
fnComponent~GenericCallback

The function to run every x seconds.

intervalnumber

Execute the specified function every x milliseconds.

Listens to Events:
Returns:

Returns an id that can be used to identify the interval. It can also be be used in Component#clearInterval to clear the interval.

Type: 
number

setTimeout(fn, timeout) → {number}

Creates a function that runs after an x millisecond timeout. This function is a wrapper around window.setTimeout. There are a few reasons to use this one instead though:

  1. It gets cleared via Component#clearTimeout when Component#dispose gets called.
  2. The function callback will gets turned into a Component~GenericCallback

Note: You can't use window.clearTimeout on the id returned by this function. This will cause its dispose listener not to get cleaned up! Please use Component#clearTimeout or Component#dispose instead.

Parameters:
NameTypeDescription
fnComponent~GenericCallback

The function that will be run after timeout.

timeoutnumber

Timeout in milliseconds to delay before executing the specified function.

Listens to Events:
Returns:

Returns a timeout ID that gets used to identify the timeout. It can also get used in Component#clearTimeout to clear the timeout that was set.

Type: 
number

show()

Show the Components element if it is hidden by removing the 'vjs-hidden' class name from it.

toggleClass(classToToggle, predicateopt)

Add or remove a CSS class name from the component's element.

Parameters:
NameTypeAttributesDescription
classToTogglestring

The class to add or remove based on (@link Component#hasClass}

predicateboolean | Dom~predicate<optional>

An Dom~predicate function or a boolean

trigger(event, hashopt)

This function causes an event to happen. This will then cause any event listeners that are waiting for that event, to get called. If there are no event listeners for an event then nothing will happen.

If the name of the Event that is being triggered is in EventTarget.allowedEvents_. Trigger will also call the on + uppercaseEventName function.

Example: 'click' is in EventTarget.allowedEvents_, so, trigger will attempt to call onClick if it exists.

Parameters:
NameTypeAttributesDescription
eventstring | Event | Object

The name of the event, an Event, or an object with a key of type set to an event name.

hashObject<optional>

Optionally extra argument to pass through to an event listener

triggerReady()

Trigger all the ready listeners for this Component.

unpressButton()

Take the current MenuButton out of a pressed state.

update()

Update the menu based on the current state of its items.

width(numopt, skipListenersopt) → {number|undefined}

Get or set the width of the component based upon the CSS styles. See Component#dimension for more detailed information.

Parameters:
NameTypeAttributesDescription
numnumber | string<optional>

The width that you want to set postfixed with '%', 'px' or nothing.

skipListenersboolean<optional>

Skip the componentresize event trigger

Returns:

The width when getting, zero if there is no width

Type: 
number | undefined

Events

componentresize

Triggered when a component is resized.

Type:

dispose

Triggered when a Component is disposed.

Type:
Properties
NameTypeAttributesDefaultDescription
bubblesboolean<optional>
false

set to false so that the dispose event does not bubble up

ready

Triggered when a Component is ready.

Type:

tap

Triggered when a Component is tapped.

Type:
  • MouseEvent