Question

Basically I have a function that reads cookies. getCookie(‘message’).

When getCookie('message') value changes I want to display an alert with the new value.

I think the function can be treated as a variable. Thus the question’s title if not please let me know so I correct it. How can I listen for a change in the value the function returns?

Answer 1

basic polling example

var message = getCookie('message');
setInterval(function(){
    var m = getCookie('message');
    if(m != message) {
        message = m;
        alert(message);
    }
}, 1000);