jQuery plugin to identify an element content chenge

whenNotEmpty.js

$.fn.extend({
  whenNotEmpty: function (callback) {
    var element = $(this);
    var loadListen = setInterval(function () {
      var conteudoLength = $.trim(element.html()).length;
      if (conteudoLength > 0) {
        clearInterval(loadListen)
        if (callback) { callback(); };
      };
    }, 100);
  }
});

Good to run a callback after ajax request.