check if user has already installed PWA to homescreen on Chrome?

Question

I\'m trying to create an \"Add To Home Screen\" button on my progressive web app, as described in Chrome\'s documentation.

I\'m generally following the prescribed p

Answer 1

HTML

install

JAVASCRIPT

// variable store event
window.deferredPrompt = {};

// get button with id
const install_button = document.querySelector('#install');

// if the app can be installed emit beforeinstallprompt
window.addEventListener('beforeinstallprompt', e => {
  // this event does not fire if the application is already installed
  // then your button still hidden ;)

  // show button with display:block;
  install_button.style.display = 'block';

  // prevent default event
  e.preventDefault();

  // store install avaliable event
  window.deferredPrompt = e;

  // wait for click install button by user
  install_button.addEventListener('click', e => {
    window.deferredPrompt.prompt();
    window.deferredPrompt.userChoice.then(choiceResult => {
      if (choiceResult.outcome === 'accepted') {
        // user accept the prompt

        // lets hidden button
        install_button.style.display = 'none';
      } else {
        console.log('User dismissed the prompt');
      }
      window.deferredPrompt = null;
    });
  });
});

// if are standalone android OR safari
if (window.matchMedia('(display-mode: standalone)').matches || window.navigator.standalone === true) {
  // hidden the button
  install_button.style.display = 'none';
}

// do action when finished install
window.addEventListener('appinstalled', e => {
  console.log("success app install!");
});