Waiting With Polling

From GreaseSpot

This simple function will allow you to easily wait for an event (i.e. an AJAX load to populate the page with data), via polling.

function wait(check, callback){
  if (check()) callback()
  else window.setTimeout(wait, 300, check, callback);
}

Example usage:

wait(
  function(){ return count==0; },
  function(){ alert('allfound'); }
);