Sensor.onactivate - Web APIs
the onactivate eventhandler is called when one of the sensor interface's child interfaces becomes active.
... syntax sensorinstance.onactivate = function sensorinstance.addeventlistener('activate', function() { ...
... }) because sensor is a base class, onactivate may only be used on one of its derived classes.
... specifications specification status comment generic sensor apithe definition of 'onactivate' in that specification.

ServiceWorkerGlobalScope.onactivate - Web APIs
the onactivate property of the serviceworkerglobalscope interface is an event handler fired whenever an activate event occurs (when the service worker activates).
... syntax serviceworkerglobalscope.onactivate = function(event) { ...

nsITaskbarPreviewController
method overview boolean drawpreview(in nsidomcanvasrenderingcontext2d ctx); boolean drawthumbnail(in nsidomcanvasrenderingcontext2d ctx, in unsigned long width, in unsigned long height); boolean onactivate(); void onclick(in nsitaskbarpreviewbutton button); void onclose(); attributes attribute type description height unsigned long the height in pixels of the preview image.
... onactivate() invoked when the user clicks on the tab preview.
... boolean onactivate(); parameters none.

Index - Web APIs
1172 element: domactivate event api, input, mouse events, mouseevent, reference, activate event, events, onactivate the domactivate event is fired at an element when it becomes active, such as when it is clicked on using the mouse or a keypress is used to navigate to it.
... 3923 sensor.onactivate api, eventhandler, generic sensor api, property, reference, sensor, sensor apis, sensors, activate, onactivate the onactivate eventhandler is called when one of the sensor interface's child interfaces becomes active.
... 3955 serviceworkerglobalscope.onactivate api, property, reference, service, serviceworker, serviceworkerglobalscope, workers, onactivate the onactivate property of the serviceworkerglobalscope interface is an event handler fired whenever an activate event occurs (when the service worker activates).

ServiceWorkerGlobalScope: activate event - Web APIs
bubbles no cancelable no interface extendableevent event handler property serviceworkerglobalscope.onactivate examples the following snippet shows how you could use an activate event handler to upgrade a cache.
... globalscope.addeventlistener('activate', function(event) { var cachewhitelist = ['v2']; event.waituntil( caches.foreach(function(cache, cachename) { if (cachewhitelist.indexof(cachename) == -1) { return caches.delete(cachename); } }) ); }); you can also set up the event handler using the serviceworkerglobalscope.onactivate property: globalscope.onactivate = function(event) { ...

tabs - Archive of obsolete content
onactivate function a callback function that will be registered for the 'activate' event.

windows - Archive of obsolete content
onactivate function a callback function that is called when the window is made active.

Chrome-only CSS reference
tactivated by the properties attribute.::-moz-tree-cell-text(hover)the :-moz-tree-cell-text(hover) css pseudo-class will match an element if the mouse cursor is presently hovering over text in a tree cell.::-moz-tree-columnactivated by the properties attribute.::-moz-tree-drop-feedbackactivated by the properties attribute.::-moz-tree-imageactivated by the properties attribute.::-moz-tree-indentationactivated by the properties attribute.::-moz-tree-lineactivated by the properties attribute.::-moz-tree-progressmeteractivated when the type attribute is set to progressmeter.

nsITaskbarWindowPreview
note: this interface will never invoke the controller's nsitaskbarpreviewcontroller.onclose() or nsitaskbarpreviewcontroller.onactivate() methods, since handling them may conflict with other internal gecko state management.

Sensor - Web APIs
sensor.onactivate called when one of the sensor interface's becomes active.

ServiceWorkerGlobalScope - Web APIs
also available via the serviceworkerglobalscope.onactivate property.

ServiceWorkerState - Web APIs
during this state, extendableevent.waituntil() can be called inside the onactivate event handler to extend the life of the active worker until the passed promise resolves successfully.

Using Service Workers - Web APIs
the primary use of onactivate is for cleanup of resources used in previous versions of a service worker script.

Service Worker API - Web APIs
note: because oninstall/onactivate could take a while to complete, the service worker spec provides a waituntil method, once this is called oninstall or onactivate, it passes a promise.

Using bounded reference spaces - Web APIs
you can create a session that supports a bounded-floor reference space if available by using code such as the following: async function onactivatexrbutton(event) { if (!xrsession) { navgator.xr.requestsession("immersive-vr"), { requiredfeatures: ["local-floor"], optionalfeatures: ["bounded-floor"] }).then((session) => { xrsession = session; startsessionanimation(); }); } } this function, called when the user clicks on a button to start the xr experience, works as usual, exiting at once if a session ...