Events
Turbo emits a variety of Custom Events types, dispatched from the following
sources:
When using jQuery, the data on the event must be accessed as $event.originalEvent.detail.
Document
Turbo Drive emits events that allow you to track the navigation life cycle and respond to page loading. Except where noted, the following events fire on the document.documentElement object (i.e., the <html> element).
turbo:click
Fires when you click a Turbo-enabled link. The clicked element is the event.target. Access the requested location with event.detail.url. Cancel this event to let the click fall through to the browser as normal navigation.
event.detail property |
Type | Description |
|---|---|---|
url |
string |
the requested location |
originalEvent |
MouseEvent | the original click event |
turbo:before-visit
Fires before visiting a location, except when navigating by history. Access the requested location with event.detail.url. Cancel this event to prevent navigation.
event.detail property |
Type | Description |
|---|---|---|
url |
string |
the requested location |
turbo:visit
Fires immediately after a visit starts. Access the requested location with event.detail.url and action with event.detail.action.
event.detail property |
Type | Description |
|---|---|---|
url |
string |
the requested location |
action |
`“advance” \ | “replace” \ |
turbo:before-cache
Fires before Turbo saves the current page to cache.
Instances of turbo:before-cache events do not have an event.detail property.
turbo:before-render
Fires before rendering the page. Access the new <body> element with event.detail.newBody. Rendering can be canceled and continued with event.detail.resume (see Pausing Rendering). Customize how Turbo Drive renders the response by overriding the event.detail.render function (see Custom Rendering).
event.detail property |
Type | Description |
|---|---|---|
renderMethod |
`“replace” \ | “morph”` |
newBody |
HTMLBodyElement | the new <body> element that will replace the document’s current <body> element |
isPreview |
boolean |
whether or not the render is a preview of a cached page |
resume |
(value?: any) => void |
called when Pausing Requests |
render |
(currentBody, newBody) => void |
override to Customize Rendering |
turbo:render
Fires after Turbo renders the page. This event fires twice during an application visit to a cached location: once after rendering the cached version, and again after rendering the fresh version.
event.detail property |
Type | Description |
|---|---|---|
renderMethod |
`“replace” \ | “morph”` |
isPreview |
boolean |
whether or not the render is a preview of a cached page |
turbo:load
Fires once after the initial page load, and again after every Turbo visit.
event.detail property |
Type | Description |
|---|---|---|
url |
string |
the requested location |
timing.visitStart |
number |
timestamp at the start of the Visit |
timing.requestStart |
number |
timestamp at the start of the HTTP request for the next page |
timing.requestEnd |
number |
timestamp at the end of the HTTP request for the next page |
timing.visitEnd |
number |
timestamp at the end of the Visit |
Page Refreshes
Turbo Drive emits events while morphing the page’s content.
turbo:morph
Fires after Turbo morphs the page.
event.detail property |
Type | Description |
|---|---|---|
currentElement |
Element | the original Element that remains connected after the morph (most commonly document.body) |
newElement |
Element | the Element with the new attributes and children that is not connected after the morph |
turbo:before-morph-element
Fires before Turbo morphs an element. The event.target references the original element that will remain connected to the document. Cancel this event by calling event.preventDefault() to skip morphing and preserve the original element, its attributes, and its children.
event.detail property |
Type | Description |
|---|---|---|
newElement |
Element | the Element with the new attributes and children that is not connected after the morph |
turbo:before-morph-attribute
Fires before Turbo morphs an element’s attributes. The event.target references the original element that will remain connected to the document. Cancel this event by calling event.preventDefault() to skip morphing and preserve the original attribute value.
event.detail property |
Type | Description |
|---|---|---|
attributeName |
string |
the name of the attribute to be mutated |
mutationType |
`“updated” \ | “removed”` |
turbo:morph-element
Fires after Turbo morphs an element. The event.target references the morphed element that remains connected after the morph.
event.detail property |
Type | Description |
|---|---|---|
newElement |
Element | the Element with the new attributes and children that is not connected after the morph |
Forms
Turbo Drive emits events during submission, redirection, and submission failure. The following events fire on the <form> element during submission.
turbo:submit-start
Fires during a form submission. Access the FormSubmission object with event.detail.formSubmission. Abort form submission (e.g. after validation failure) with event.detail.formSubmission.stop(). Use event.originalEvent.detail.formSubmission.stop() if you’re using jQuery.
event.detail property |
Type | Description |
|---|---|---|
formSubmission |
FormSubmission |
the <form> element submission |
turbo:submit-end
Fires after the form submission-initiated network request completes. Access the FormSubmission object with event.detail.formSubmission along with FormSubmissionResult properties included within event.detail.
event.detail property |
Type | Description |
|---|---|---|
success |
boolean |
a boolean representing the request’s success |
fetchResponse |
`FetchResponse \ | null` |
error |
Error or null |
null when success: true, present when success: false |
Frames
Turbo Frames emit events during their navigation life cycle. The following events fire on the <turbo-frame> element.
turbo:before-frame-render
Fires before rendering the <turbo-frame> element. Access the new <turbo-frame> element with event.detail.newFrame. Rendering can be canceled and continued with event.detail.resume (see Pausing Rendering). Customize how Turbo Drive renders the response by overriding the event.detail.render function (see Custom Rendering).
event.detail property |
Type | Description |
|---|---|---|
newFrame |
FrameElement |
the new <turbo-frame> element that will replace the current <turbo-frame> element |
resume |
(value?: any) => void |
called when Pausing Requests |
render |
(currentFrame, newFrame) => void |
override to Customize Rendering |
turbo:frame-render
Fires right after a <turbo-frame> element renders its view. The specific <turbo-frame> element is the event.target. Access the FetchResponse object with event.detail.fetchResponse property.
event.detail property |
Type | Description |
|---|---|---|
fetchResponse |
FetchResponse |
the HTTP request’s response |
turbo:frame-load
Fires when a <turbo-frame> element is navigated and finishes loading (fires after turbo:frame-render). The specific <turbo-frame> element is the event.target.
Instances of turbo:frame-load events do not have an event.detail property.
turbo:frame-missing
Fires when the response to a <turbo-frame> element request does not contain a matching <turbo-frame> element. By default, Turbo writes an informational message into the frame and throws an exception. Cancel this event to override this handling. You can access the Response instance with event.detail.response, and perform a visit by calling event.detail.visit(location, visitOptions) (see Turbo.visit to learn more about VisitOptions).
event.detail property |
Type | Description |
|---|---|---|
response |
Response | the HTTP response for the request initiated by a <turbo-frame> element |
visit |
`async (location: string \ | URL, visitOptions: VisitOptions) => void` |
Streams
Turbo Streams emit events during their life cycle. The following events fire on the <turbo-stream> element.
turbo:before-stream-render
Fires before rendering a Turbo Stream page update. Access the new <turbo-stream> element with event.detail.newStream. Customize the element’s behavior by overriding the event.detail.render function (see Custom Actions).
event.detail property |
Type | Description |
|---|---|---|
newStream |
StreamElement |
the new <body> element that will replace the document’s current <body> element |
render |
async (currentElement) => void |
override to define Custom Actions |
HTTP Requests
Turbo emits events when fetching content over HTTP. Depending on the what
initiated the request, the events could fire on:
- a
<turbo-frame>during its navigation - a
<form>during its submission - the
<html>element during a page-wide Turbo Visit
turbo:before-fetch-request
Fires before Turbo issues a network request (to fetch a page, submit a form, preload a link, etc.). Access the requested location with event.detail.url and the fetch options object with event.detail.fetchOptions. This event fires on the respective element (<turbo-frame> or <form> element) which triggers it and can be accessed with event.target property. Request can be canceled and continued with event.detail.resume (see Pausing Requests).
event.detail property |
Type | Description |
|---|---|---|
fetchOptions |
RequestInit | the options used to construct the Request |
url |
URL | the request’s location |
resume |
(value?: any) => void callback |
called when Pausing Requests |
turbo:before-fetch-response
Fires after the network request completes. Access the fetch options object with event.detail. This event fires on the respective element (<turbo-frame> or <form> element) which triggers it and can be accessed with event.target property.
event.detail property |
Type | Description |
|---|---|---|
fetchResponse |
FetchResponse |
the HTTP request’s response |
turbo:before-prefetch
Fires before Turbo prefetches a link. The link is the event.target. Cancel this event to prevent prefetching.
turbo:fetch-request-error
Fires when a form or frame fetch request fails due to network errors. This event fires on the respective element (<turbo-frame> or <form> element) which triggers it and can be accessed with event.target property. This event can be canceled.
event.detail property |
Type | Description |
|---|---|---|
request |
FetchRequest |
The HTTP request that failed |
error |
Error | provides the cause of the failure |
