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Actions and events

This documentation covers actions and events for AMP websites, stories and ads. Read Actions and events in AMP email for the AMP email format.

The on attribute is used to install event handlers on elements. The events that are supported depend on the element.

The value for the syntax is a simple domain-specific language of the form:

eventName:targetId[.methodName[(arg1=value, arg2=value)]]

See the table below for descriptions of each part of the syntax.

Syntax Required? Description
eventName yes This is the name of the event that an element exposes.
targetId yes This is the DOM id for the element, or a predefined special target you'd like to execute an action on in response to the event. In the following example, the targetId is the DOM id of the amp-lightbox target, photo-slides. 
<amp-lightbox id="photo-slides"></amp-lightbox>
<button on="tap:photo-slides">Show Images</button>
methodName no This is for elements with default actions.

This is the method that the target element (referenced by targetId) exposes and you'd like to execute when the event is triggered.

AMP has a concept of a default action that elements can implement. So when omitting the methodName AMP will execute that default method.
arg=value no Some actions, if documented, may accept arguments. The arguments are defined between parentheses in key=value notation. The accepted values are:
  • simple unquoted strings: simple-value
  • quoted strings: "string value" or 'string value'
  • boolean values: true or false
  • numbers: 11 or 1.1
  • dot-syntax reference to event data: event.someDataVariableName

Handling multiple events

You can listen to multiple events on an element by separating the events with a semicolon ;.

Example: on="submit-success:lightbox1;submit-error:lightbox2"

Multiple actions for one event

You can execute multiple actions in sequence for the same event by separating the actions with a comma ','.

Example: on="tap:target1.actionA,target2.actionB"

Globally-defined events and actions

AMP defines a tap event globally that you can listen to on any HTML element (including AMP elements).

AMP also defines the hide, show and toggleVisibility actions globally that you can trigger on any HTML element.

An element can only be shown if it was previously hidden by a hide or toggleVisibility action, or by using the hidden attribute. The show action does not support elements hidden by CSS display:none or AMP's layout=nodisplay.

For example, the following is possible in AMP:

<div id="warning-message">Warning...</div>

<button on="tap:warning-message.hide">Cool, thanks!</button>

Element-specific events

* - all elements

Event Description
tap Fired when the element is clicked/tapped.
copy-success Fired when the content/text is successfully copied into the clipboard.
copy-error Fired when there's an error while copying the content. If there's an error while copying the content, the event.data.type will be set to the error value. If the browser is not supporting the copy method, the event.data.type will be set to the browser value.

Input elements

Event Description Elements Data
change Fired when the value of the element is changed and committed.

Data properties mirror those in HTMLInputElement and HTMLSelectElement.

 input 
event.min
event.max
event.value
event.valueAsNumber
input[type="radio"],
input[type="checkbox"]		 event.checked
select 
event.min
event.max
event.value
input-debounced Fired when the value of the element is changed. This is similar to the standard change event, but it only fires when 300ms have passed after the value of the input has stopped changing. Elements that fire input event. Same as change event data.
input-throttled Fired when the value of the element is changed. This is similar to the standard change event, but it is throttled to firing at most once every 100ms while the value of the input is changing. Elements that fire input event. Same as change event data.

amp-accordion > section

Event Description Data
expand Fired when an accordion section expands. None.
collapse Fired when an accordion section collapses. None.

amp-carousel[type="slides"]

Event Description Data
slideChange Fired when the carousel's current slide changes. 
// Slide number.
event.index

amp-lightbox

Event Description Data
lightboxOpen Fired when lightbox is fully visible. None
lightboxClose Fired when lightbox is fully closed. None

amp-list

Event Description Data
fetch-error(low-trust) Fired when fetching data fails. None

amp-selector

Event Description Data
select Fired when an option is selected or deselected. 
// Target element's "option" attribute value.
event.targetOption

// Array of "option" attribute values of all selected elements.
event.selectedOptions

amp-sidebar

Event Description Data
sidebarOpen Fired when sidebar is fully opened after transition has ended. None
sidebarClose Fired when sidebar is fully closed after transition has ended. None

amp-state

Event Description Data
fetch-error(low-trust) Fired when fetching data fails. None

amp-video and other Video Elements

The events below are dispatched by amp-video, amp-video-iframe and 3rd party video players like amp-youtube.

Event Description Data
firstPlay(low-trust) Fired the first time the video is played by the user. On autoplay videos, this is fired as soon as the user interacts with the video. This event is low-trust which means it can not trigger most actions; only low-trust actions such as amp-animation actions can be run.
timeUpdate(low-trust) Fired when the playing position of a video has changed. Frequency of the event is controlled by AMP and is currently set at 1 second intervals. This event is low-trust which means it can not trigger most actions; only low-trust actions such as amp-animation actions can be run. {time, percent}time indicates the current time in seconds, percent is a number between 0 and 1 and indicates current position as percentage of total time.

form

Event Description Data
submit Fired when the form is submitted.
submit-success Fired when the form submission response is success. 
// Response JSON.
event.response
submit-error Fired when the form submission response is an error. 
// Response JSON.
event.response
valid Fired when the form is valid.
invalid Fired when the form is invalid.

Element-specific actions

* (all elements)

Action Description
hide Hides the target element.
show Shows the target element. If an autofocus element becomes visible as a result, it gains focus.
toggleVisibility Toggles the visibility of the target element. If an autofocus element becomes visible as a result, it gains focus.
toggleClass(class=STRING, force=BOOLEAN) Toggles class of the target element. force is optional, and if defined, it ensures that class would only be added but not removed if set to true, and only removed but not added if set to false.
toggleChecked(force=BOOLEAN) Toggles checked state of the target element. force is optional, and if defined, it ensures that the resulting state would be identical to the value of force.
scrollTo(duration=INTEGER, position=STRING) Scrolls an element into view with a smooth animation.
duration is optional. Specifies the length of the animation in milliseconds. If unspecified, an amount relative to scroll difference under or equal to 500 milliseconds is used.
position is optional. One of top, center or bottom (default top). Specifies the position of the element relative to the viewport after scrolling.
As an accessibility best practice, pair this with a call to focus() to focus on the element being scrolled to.
focus Makes the target element gain focus. To lose focus, focus on another element (usually parent element). We strongly advise against losing focus by focusing on body/documentElement for accessibility reasons.

amp-audio

Action Description
play Plays the audio. Is a no-op if the <amp-audio> element is a descendant of <amp-story>.
pause Pauses the audio. Is a no-op if the <amp-audio> element is a descendant of <amp-story>.

amp-bodymovin-animation

Action Description
play Plays the animation.
pause Pauses the animation.
stop Stops the animation.
seekTo(time=INTEGER) Sets the currentTime of the animation to the specified value and pauses animation.
seekTo(percent=[0,1]) Uses the given percentage value to determine the currentTime of the animation to the specified value and pauses animation.

amp-accordion

Action Description
toggle(section=STRING) Toggles the expanded and collapsed states of amp-accordion sections. When called with no arguments, it toggles all sections of the accordion. Trigger on a specific section by providing the section id: on="tap:myAccordion.toggle(section='section-id')".
expand(section=STRING) Expands the sections of the accordion. If a section is already expanded, it stays expanded. When called with no arguments, it expands all sections of the accordion. Trigger on a specific section by providing the section id: on="tap:myAccordion.expand(section='section-id')".
collapse(section=STRING) Collapses the sections of the accordion. If a section is already collapsed, it stays collapsed. When called with no arguments, it collapses all sections of the accordion. Trigger on a specific section by providing the section id: on="tap:myAccordion.collapse(section='section-id')".

amp-carousel[type="slides"]

Action Description
goToSlide(index=INTEGER) Advances the carousel to a specified slide index.
toggleAutoplay(toggleOn=true|false) Toggle the carousel's autoplay status. toggleOn is optional.

amp-image-lightbox

Action Description
open (default) Opens the image lightbox with the source image being the one that triggered the action.

amp-lightbox

Action Description
open (default) Opens the lightbox.
close Closes the lightbox.
Action Description
open Opens the lightbox-gallery. Can be triggered by tapping another element, if you specify the image id: `on="tap:amp-lightbox-gallery.open(id='image-id')"`.

amp-list

Action Description
changeToLayoutContainer Update's amp-list's layout to layout="CONTAINER" to allow dynamic resizing.
refresh Refreshes data from the src and re-renders the list.

amp-live-list

Action Description
update (default) Updates the DOM items to show updated content.

amp-selector

Action Description
clear Clears all selections from a defined amp-selector.
selectUp(delta=INTEGER) Moves the selection up by the value of `delta`. The default `delta` is set to -1. If no options are selected, the selected state will become the value of the last option.
selectDown(delta=INTEGER) Moves the selection down by the value of `delta`. The default `delta` is set to 1. If no options are selected, the selected state will become the value of the first option.
toggle(index=INTEGER, value=BOOLEAN) Toggles the application of the `selected`. If the select attribute is absent, this action adds it. If the select attribute is present, this action removes it. You may force and keep an add or remove by including a boolean value in the `value` argument. A value of `true` will force add the `selected` attribute and not remove it if already present. A value of `false` will remove the attribute, but not add it if absent.

amp-sidebar

Action Description
open (default) Opens the sidebar.
close Closes the sidebar.
toggle Toggles the state of the sidebar.

amp-state

Action Description
refresh Refetches data at the `src` attribute while ignoring browser cache.

amp-user-notification

Action Description
dismiss (default) Hides the referenced user notification element.

amp-video and other Video Elements

The actions below are supported in amp-video, amp-video-iframe and 3rd party video players like amp-youtube.

Action Description
play Plays the video.
pause Pauses the video.
mute Mutes the video.
unmute Unmutes the video.
fullscreenenter Takes the video to fullscreen.

form

Action Description
clear Clears any values in the form's inputs.
submit Submits the form.

Special targets

The following are targets provided by the AMP system that have special requirements:

Target: AMP

The AMP target is provided by the AMP runtime and implements top-level actions that apply to the whole document.

Action Description
navigateTo(url=STRING, target=STRING, opener=BOOLEAN)

Navigates current window to given URL, to the optional specified target if given (currently only supporting _top and _blank ). The optional opener parameter can be specified when using a target of _blank to allow the newly opened page to access window.opener.

Caveat: Using normal <a> links is recommended wherever possible since AMP.navigateTo is not recognized by web crawlers.
closeOrNavigateTo(url=STRING, target=STRING, opener=BOOLEAN)

Tries to close the window if allowed, otherwise it navigates similar to navigateTo Action. Useful for use-cases where a "Back" button may need to close the window if it were opened in a new window from previous page or navigate if it wasn't opened.

Caveat: Using normal <a> links is recommended wherever possible since AMP.closeOrNavigateTo is not recognized by web crawlers.
goBack(navigate=BOOLEAN) Navigates back in history. `navigate` is optional, and if set to true, allows for cross-document navigation similar to [history.back](https://developer.mozilla.org/en-US/docs/Web/API/History/back).
print Opens the Print Dialog to print the current page.
scrollTo(id=STRING, duration=INTEGER, position=STRING) Scrolls to the provided element ID on the current page.
optoutOfCid Opts out of Client ID generation for all scopes.
setState({foo: 'bar'})1

Requires amp-bind.

Merges an object literal into the bindable state.
pushState({foo: 'bar'})1

Requires amp-bind.

Merges an object literal into the bindable state and pushes a new entry onto browser history stack. Popping the entry will restore the previous values of variables (in this example, foo).

copy(text='content')

Copy any content to the clipboard. text is optional, and if is set it will copy those content/value into the clipboard.

 toggleTheme() Toggles the amp-dark-mode class on the body element when called and sets users preference to the localStorage. The amp-dark-mode class is added by default to body based on the prefers-color-scheme value. Use data-prefers-dark-mode-class attribute on body tag to override the class to be used for dark mode.

1When used with multiple actions, subsequent actions will wait for setState() or pushState() to complete before invocation. Only a single setState() or pushState() is allowed per event.

Target: amp-access

The amp-access target is provided by the amp-access component.

The amp-access target is special for these reasons:

  1. You can't give an arbitrary ID to this target. The target is always amp-access.
  2. The actions for amp-access are dynamic depending on the structure of the AMP Access Configuration.

See details about using the amp-access target.