latency-monitor

Class: VisibilityChangeEmitter

VisibilityChangeEmitter

new VisibilityChangeEmitter()

Listen to page visibility change events (i.e. when the page is focused / blurred) by an event emitter.

Warning: This does not work on all browsers, but should work on all modern browsers

Example
const myVisibilityEmitter = new VisibilityChangeEmitter();

    myVisibilityEmitter.on('visibilityChange', (pageInFocus) => {
       if ( pageInFocus ){
           // Page is in focus
           console.log('In focus');
       }
       else {
           // Page is blurred
           console.log('Out of focus');
       }
    });
    // To access the visibility state directly, call:
    console.log('Am I focused now? ' + myVisibilityEmitter.isVisible());