How do you make an event listener that detects if a boolean variable becomes true?

Question

For example, I have var menu_ready = false;. I have an ajax function that sets menu_ready to true when the ajax stuff is done:

//se         


        

Answer 1

One way is continual polling:

function checkMenu() {
    if (!menu_ready) {
        setTimeout("checkMenu();", 1000);
        return;
    } else {
        // menu_ready is true, so do what you need to do here.
    }
}

and...