Prevent restarting web applications on iPad

Question

I have a web application running on an iPad. It works in full screen mode. If I switch the task to another application (by double-clicking the home button, etc.), return to my web application, then my web application will restart.

Is there a way to prevent the web application from restarting when it receives focus after switching iPad tasks? Obviously, I just want him to prove himself exactly in the state in which he was when he lost focus.

Thanks.

Answer 1

No, It is Immpossible.

The best way to act is to save state in localStorage. If you use, for example. The hash URL to track your status (for example, myApp.html / # loginScreen), you can save this information and then apply it to location.hash, which will send window.onhashchange.

In other words (codes are just an example written on the fly):

1 - save the relevant information in localStorage:

localStorage.setItem("state", "loginScreen"); 

2 - get the value at startup and apply it to the hash:

 location.hash = (localStorage.getItem("state")) ? localStorage.getItem("state") : ""; 

3 - associate an event listener with onhashchange and go from there:

 window.addEventListener("hashchange", function() { if (location.hash.length) { alert("Current state of UI is :"+ location.hash); } }, false); 

Answer 2

At least in iOS 4.2.1, 5.1.1, 6.0 and 6.1 this seems possible; I think the answer accepted for this question is incorrect.

The trick is this:

 // Start or resume session session_start(); // Extend cookie life time by an amount of your liking $cookieLifetime = 365 * 24 * 60 * 60; // A year in seconds setcookie(session_name(),session_id(),time()+$cookieLifetime); 

For a more detailed discussion of this strategy, take a look at Maintaining a PHP Session in a Web Application on iPhone