script.js

        //Used to search a table
        (function (document) {
            'use strict';

            var TableFilter = (function (myArray) {
                var search_input;

                function _onInputSearch(e) {
                    search_input = e.target;
                    var tables = document.getElementsByClassName(search_input.getAttribute('data-table'));
                    myArray.forEach.call(tables, function (table) {
                        myArray.forEach.call(table.tBodies, function (tbody) {
                            myArray.forEach.call(tbody.rows, function (row) {
                                var text_content = row.textContent.toLowerCase();
                                var search_val = search_input.value.toLowerCase();
                                row.style.display = text_content.indexOf(search_val) > -1 ? '' : 'none';
                            });
                        });
                    });
                }

                return {
                    init: function () {
                        var inputs = document.getElementsByClassName('search-input');
                        myArray.forEach.call(inputs, function (input) {
                            input.oninput = _onInputSearch;
                        });
                    }
                };
            })(Array.prototype);

            document.addEventListener('readystatechange', function () {
                if (document.readyState === 'complete') {
                    TableFilter.init();
                }
            });

        })(document);

        //Get the button
        var mybutton = document.getElementById("myBtn");

        // When the user scrolls down 20px from the top of the document, show the button
        window.onscroll = function () { scrollFunction() };

        function scrollFunction() {
            if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
                mybutton.style.display = "block";
            } else {
                mybutton.style.display = "none";
            }
        }

        // When the user clicks on the button, scroll to the top of the document
        function topFunction() {
            document.body.scrollTop = 0;
            document.documentElement.scrollTop = 0;
        }