setInterval() only running function once

Question

I want to periodically query a PHP script for new messages. To do so, I\'m using the setInterval() function and AJAX.

$(document).ready(function(){

    var          


        

Answer 1

Actually, setInterval isn't running getMessages at all (not even once). setInterval expects a reference to a function, but you're executing the getMessages function immediately and passing its return value to setInterval (which is undefined). That's what the parens after getMessage do.

Pass a reference to setInterval like this:

setInterval(getMessages, queryInterval);

If this is the only place that getMessages is used, then you could also write it like this:

setInterval(function() {
    console.log("tick");
}, queryInterval);