Intercepting browser messages slower script

Question

Is it possible to intercept browser messages, such as:

Firefox:

A script on this page may be busy or it may stop responding. You can now stop the script, open the script in the debugger, or continue the script.

those.

A script on this page invokes a web browser to run slowly. If it continues to work, your computer may stop responding.

These posts are due to the fact that the page has a lot of javascript / jquery activity.

I argue that the fact that these messages appear in the first place indicates a wider problem, but is there a way to influence this message / situation on the client side so that a message that is more user-friendly is possible?

Answer 1

There is no way to do this, imagine that a malicious user is writing a script that slows down your browser until it is completely inaccessible, now the warning “Slow Script” may come to the rescue, but what if he can intercept it and prevent it show?

You need to find a solution to the main problem, that is, if you are doing a lot of calculations (which, I suppose, you are doing this), you need to break them into pieces, put them in queues and process them either asynchronously (if possible), either ok but with a short timeout between them.

In pseudocode, it might look like this:

var queue = []; // put your functions or the data in here function() processQueue{ if (queue.length > 0) { var item = queue.shift() // pop of the first item of the queue item(); // call the function, or in case of data pass it to th processing function setTimeout(processQueue, 100); // wait 100 ms before processing the next chunck } } setTimeout(processQueue, 0); 

Answer 2

No, it is impossible to intercept these messages, they are at a lower level in the engine to protect the user. Instead, take a look at what takes so much time, optimize as much as possible ... perhaps breaking your work into pieces that have processing flaws, so you don't run messages.