onAvailable

onAvailable.js

//not mine
$.fn.onAvailable = function(fn) {
  var sel = this.selector;
  var timer;
  var self = this;
  if (this.length > 0) {
    fn.call(this);
  } else {
    timer = setInterval(function() {
        if ($(sel).length > 0) {
            fn.call($(sel));
            clearInterval(timer);
        }
    }, 50);
  }
};