Verify if the screen is in full view by monitoring document.fullscreenElement within Vue3

Is there a way to determine when the document is in fullscreen mode? I attempted to monitor document.fullscreen with the following code, but it was not successful:

watch(document.fullscreenElement, (newValue) => {
  fullScreenActivated.value = newValue
})

However, I encountered the following issue:

[Vue warn]: Invalid watch source:  null A watch source can only be a getter/effect function, a ref, a reactive object, or an array of these types. 
  at <App> 2 runtime-core.esm-bundler.js:41

[Vue warn]: Invalid watch source:  document.fullscreenElement A watch source can only be a getter/effect function, a ref, a reactive object, or an array of these types. 
  at <App>

It seems that watching this element directly is not possible. If anyone has a solution or idea on how to achieve this functionality differently, please share – any help would be greatly appreciated! :)

Answer №1

When not using Vue, reactivity is typically achieved through DOM events. For example, the fullscreen property can be tracked using the fullscreenchange event.

Vueuse provides composables that encapsulate common browser APIs in a similar fashion, such as useFullscreen.

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