Essentially, there is no straightforward method to detect a lock screen using HTML or Javascript.
One workaround could be to utilize Cordova (formerly PhoneGap) to develop a mobile application. I have even created a class that simplifies event handling in PhoneGap apps.
You can also consider utilizing Application paused events and AJAX loaders to manage online functionality within your app without running into Cross-Origin domain restrictions commonly faced in JavaScript development.
However, this approach would require significant effort to transform your website into a mobile application.
Additional Details:
Cordova enables the creation of mobile apps using HTML, CSS, and JavaScript, along with offering specialized events for mobile development and access to phone hardware capabilities. More information can be found at .
Alternative Idea:
Kudos to @jeroenk for inspiring this concept. You might try a workaround on your webpage by implementing the following script:
window.timestamp = Math.round(new Date().getTime()/1000);
setInterval(4000, function(){
var curTime = Math.round(new Date().getTime()/1000);
if(curTime > window.timestamp+5){
// perform redirect action
}
window.timestamp = Math.round(new Date().getTime()/1000);
});
This code periodically checks if the Javascript execution is in sync every 4 seconds, allowing for a slight delay to account for potential lag. While this idea is speculative, it may offer a workaround solution.