The fullscreen API allows for the creation of a full-screen element containing internal elements, while also enabling the functionality

Is it possible to utilize the fullscreen API to make any element fullscreen, even if it contains multiple internal elements, while still maintaining the functionality of dropdowns and other custom elements that may be located in different areas of the page?

For example, when trying to make a div with dropdowns (such as https://code.google.com/p/ufd/) fullscreen, the dropdown functionality is compromised (the dropdowns list of items are hidden behind the div).

I am looking for a solution where the dropdown functionality remains intact even in fullscreen mode.

Is there a way to achieve this without having to change the z-index of dropdown lists and other elements?

javascriptjqueryhtmlcssjquery-ui

Answer №1

If you are experiencing issues with the dropdown element not appearing correctly, it could be due to it being attached to a parent element that is not within the fullscreen element, such as the document body. One solution to this problem is to utilize a Mutation Observer to monitor specific elements (such as the dropdown) being added to the document body and then move them under the fullscreen element for proper display.


fullscreenMutationObserver: MutationObserver;

requestFullscreen(fullscreenElement) {

    if(document.fullscreenElement) {
      document.exitFullscreen();
      if(this.fullscreenMutationObserver) {
        this.fullscreenMutationObserver.disconnect();
      }
      return;
    }

    fullscreenElement.requestFullscreen();

    this.fullscreenMutationObserver = new MutationObserver(mutationRecords => {
      mutationRecords.forEach(mutationRecord => {
        mutationRecord.addedNodes.forEach(node => {
          if(node.isTheDropdownElementWeAreLookingFor()) {
            document.body.removeChild(node);
            document.querySelector(':fullscreen').appendChild(node);
          }
        });
      });
    });

    this.fullscreenMutationObserver.observe(document.body, { childList: true });
}

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