JavaScript - How can i tell Browser Chrome, Firefox, Safari, to allow me to have the refresh button disabled?

Question

I have logical application running where i need to store the var algorithmToApply=1 or etc;

Where each of my value has relative algorithm assigned. The

Answer 1

That is not possible.

You can, however, add a beforeunload listener which prompts for confirmation:

var algorithmToApply = 0;
window.onbeforeunload = function() {
    if (algorithmToApply !== 0) { /* Anything ..*/
        return 'A task is pending. Do you really want to leave?';
    }
};