"Triggering a Javascript event upon re-launch of a mobile browser or waking up the

Question

"Triggering a Javascript event upon re-launch of a mobile browser or waking up the

Hello everyone, I am in search of a Javascript event that can detect when a mobile browser window regains focus. This could happen when a user closes or minimizes their browser to switch back to the home screen or another app, or when the device resumes from sleep mode due to user powering it off or screen timeout.

I would prefer to find a single event that works universally, but I understand that might be difficult! The 'pageshow' event seems to work for iOS devices, but is not very reliable for everything else. I have tried using 'focus' and 'DOMActivate', but they do not produce the desired outcome.

It's important to note that the page may not always contain form elements, and I want the event to trigger without requiring the user to interact with the page again.

This need for such an event arises from our code regularly checking for new content through XHR requests. These requests are not made while the browser is asleep, leading to issues with receiving updated content and restarting timeouts.

Thank you in advance for any assistance you can offer!

javascript android ios mobile

Answer 1

Answer №1

We encountered a similar issue and addressed it with the following approach:

let lastSyncTime = 0;
const syncInterval = 60000; //sync every minute

function synchronizePage() {
  lastSyncTime = new Date().getTime(); //set last synchronization time to now
  updatePage(); //perform necessary actions
}

setInterval(function() {
  const currentTime = new Date().getTime();
  if ((currentTime - lastSyncTime) > syncInterval ) {
    synchronizePage();
  }
}, 5000); //check every 5 seconds for elapsed time since last sync reaching one minute

This method ensures synchronization occurs every minute when the page is active. If the browser is idle for over a minute, synchronization will occur within 5 seconds of reopening the browser. It's important to consider battery usage when adjusting the timings to suit your specific requirements.

Answer 2

We encountered a similar issue and addressed it with the following approach:

let lastSyncTime = 0;
const syncInterval = 60000; //sync every minute

function synchronizePage() {
  lastSyncTime = new Date().getTime(); //set last synchronization time to now
  updatePage(); //perform necessary actions
}

setInterval(function() {
  const currentTime = new Date().getTime();
  if ((currentTime - lastSyncTime) > syncInterval ) {
    synchronizePage();
  }
}, 5000); //check every 5 seconds for elapsed time since last sync reaching one minute

This method ensures synchronization occurs every minute when the page is active. If the browser is idle for over a minute, synchronization will occur within 5 seconds of reopening the browser. It's important to consider battery usage when adjusting the timings to suit your specific requirements.

Answer 3

Answer №2

Instead of using an interval, consider implementing a window blur listener and a window focus listener. When the window loses focus, record the current time. When it regains focus, check if the user is still logged in or synced.

This method achieves the same result but only runs when necessary, preventing your page from slowing down unnecessarily with an interval.

Enhancement

var $window = $(window),
  $window.__INACTIVITY_THRESHOLD = 60000;

$window.add(document.body);  //needed for mobile browsers

$window.declareActivity = function () { $window.__lastEvent = new Date(); };

$window.blur($window.declareActivity);
$window.focus(function(){
  var diff = (new Date()) - $window.__lastEvent;
  if (diff > $window.__INACTIVITY_THRESHOLD) { 
     $window.trigger("inactivity"); 
  }
});

$window.on("inactivity", "", null, function () {
  //your inactivity code
});

The use of the blur event may not be reliable on all devices, so including events like click, scroll, and keyup can improve accuracy in detecting user activity. Adjust the event list based on your site's needs, or include $window.declareActivity(); in existing scripts that respond to user inputs.

Answer 4

Instead of using an interval, consider implementing a window blur listener and a window focus listener. When the window loses focus, record the current time. When it regains focus, check if the user is still logged in or synced.

This method achieves the same result but only runs when necessary, preventing your page from slowing down unnecessarily with an interval.

Enhancement

var $window = $(window),
  $window.__INACTIVITY_THRESHOLD = 60000;

$window.add(document.body);  //needed for mobile browsers

$window.declareActivity = function () { $window.__lastEvent = new Date(); };

$window.blur($window.declareActivity);
$window.focus(function(){
  var diff = (new Date()) - $window.__lastEvent;
  if (diff > $window.__INACTIVITY_THRESHOLD) { 
     $window.trigger("inactivity"); 
  }
});

$window.on("inactivity", "", null, function () {
  //your inactivity code
});

The use of the blur event may not be reliable on all devices, so including events like click, scroll, and keyup can improve accuracy in detecting user activity. Adjust the event list based on your site's needs, or include $window.declareActivity(); in existing scripts that respond to user inputs.

"Triggering a Javascript event upon re-launch of a mobile browser or waking up the

Answer №1

Answer №2

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