A script to random restaurants and oreders from otlob.com (add it to grease monkey)

otlob.js

// ==UserScript==
// @name        random_order
// @namespace   otlob
// @description randomise order
// @include     https://www.otlob.com/*
// @version     1
// @grant       none
// @authors Mohamed Elawadi <mohamed@elawadi.net>, Ahmed Thabet <xmonader@gmail.com>
// ==/UserScript==
Element.prototype.documentOffsetTop = function () {
  return this.offsetTop + (this.offsetParent ? this.offsetParent.documentOffsetTop()  : 0);
};
window.randomize = function () {
  item_selector = document.URL == 'https://www.otlob.com/restaurants'?'.vendor':'.menu-item';
  items = $(item_selector);
  items.map(function (index, item) {
    item.style.border = '';
  })
  index = Math.floor(Math.random() * (items.length));
  item = items[index];
  var top = item.documentOffsetTop() - (window.innerHeight / 2);
  window.scrollTo(0, top);
  item.style.border = '2px solid cyan';
}
document.body.innerHTML += '<div style="z-index:1200;position:fixed;top:0; right:0;" onclick="randomize()"><i class="icon icon-add"></i></div>';