Avtomatik to‘ldirish (autocomplete)

var countries = ["Afghanistan","Albania","Algeria","Andorra","Angola","Anguilla","Antigua & Barbuda","Argentina","Armenia","Aruba","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bangladesh","Barbados","Belarus","Belgium","Belize","Benin","Bermuda","Bhutan","Bolivia","Bosnia & Herzegovina","Botswana","Brazil","British Virgin Islands","Brunei","Bulgaria","Burkina Faso","Burundi","Cambodia","Cameroon","Canada","Cape Verde","Cayman Islands","Central Arfrican Republic","Chad","Chile","China","Colombia","Congo","Cook Islands","Costa Rica","Cote D Ivoire","Croatia","Cuba","Curacao","Cyprus","Czech Republic","Denmark","Djibouti","Dominica","Dominican Republic","Ecuador","Egypt","El Salvador","Equatorial Guinea","Eritrea","Estonia","Ethiopia","Falkland Islands","Faroe Islands","Fiji","Finland","France","French Polynesia","French West Indies","Gabon","Gambia","Georgia","Germany","Ghana","Gibraltar","Greece","Greenland","Grenada","Guam","Guatemala","Guernsey","Guinea","Guinea Bissau","Guyana","Haiti","Honduras","Hong Kong","Hungary","Iceland","India","Indonesia","Iran","Iraq","Ireland","Isle of Man","Israel","Italy","Jamaica","Japan","Jersey","Jordan","Kazakhstan","Kenya","Kiribati","Kosovo","Kuwait","Kyrgyzstan","Laos","Latvia","Lebanon","Lesotho","Liberia","Libya","Liechtenstein","Lithuania","Luxembourg","Macau","Macedonia","Madagascar","Malawi","Malaysia","Maldives","Mali","Malta","Marshall Islands","Mauritania","Mauritius","Mexico","Micronesia","Moldova","Monaco","Mongolia","Montenegro","Montserrat","Morocco","Mozambique","Myanmar","Namibia","Nauro","Nepal","Netherlands","Netherlands Antilles","New Caledonia","New Zealand","Nicaragua","Niger","Nigeria","North Korea","Norway","Oman","Pakistan","Palau","Palestine","Panama","Papua New Guinea","Paraguay","Peru","Philippines","Poland","Portugal","Puerto Rico","Qatar","Reunion","Romania","Russia","Rwanda","Saint Pierre & Miquelon","Samoa","San Marino","Sao Tome and Principe","Saudi Arabia","Senegal","Serbia","Seychelles","Sierra Leone","Singapore","Slovakia","Slovenia","Solomon Islands","Somalia","South Africa","South Korea","South Sudan","Spain","Sri Lanka","St Kitts & Nevis","St Lucia","St Vincent","Sudan","Suriname","Swaziland","Sweden","Switzerland","Syria","Taiwan","Tajikistan","Tanzania","Thailand","Timor L'Este","Togo","Tonga","Trinidad & Tobago","Tunisia","Turkey","Turkmenistan","Turks & Caicos","Tuvalu","Uganda","Ukraine","United Arab Emirates","United Kingdom","United States of America","Uruguay","Uzbekistan","Vanuatu","Vatican City","Venezuela","Vietnam","Virgin Islands (US)","Yemen","Zambia","Zimbabwe"];

function autocomplete(inp, arr) {   /*the autocomplete function takes two arguments,   the text field element and an array of possible autocompleted values:*/   var currentFocus;   /*execute a function when someone writes in the text field:*/   inp.addEventListener("input", function(e) {       var a, b, i, val = this.value;       /*close any already open lists of autocompleted values*/       closeAllLists();       if (!val) { return false;}       currentFocus = -1;       /*create a DIV element that will contain the items (values):*/       a = document.createElement("DIV");       a.setAttribute("id", this.id + "autocomplete-list");       a.setAttribute("class", "autocomplete-items");       /*append the DIV element as a child of the autocomplete container:*/       this.parentNode.appendChild(a);       /*for each item in the array...*/       for (i = 0; i < arr.length; i++) {         /*check if the item starts with the same letters as the text field value:*/         if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {           /*create a DIV element for each matching element:*/           b = document.createElement("DIV");           /*make the matching letters bold:*/           b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";           b.innerHTML += arr[i].substr(val.length);           /*insert a input field that will hold the current array item's value:*/           b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";           /*execute a function when someone clicks on the item value (DIV element):*/               b.addEventListener("click", function(e) {               /*insert the value for the autocomplete text field:*/               inp.value = this.getElementsByTagName("input")[0].value;               /*close the list of autocompleted values,               (or any other open lists of autocompleted values:*/               closeAllLists();           });           a.appendChild(b);         }       }   });   /*execute a function presses a key on the keyboard:*/   inp.addEventListener("keydown", function(e) {       var x = document.getElementById(this.id + "autocomplete-list");       if (x) x = x.getElementsByTagName("div");       if (e.keyCode == 40) {         /*If the arrow DOWN key is pressed,         increase the currentFocus variable:*/         currentFocus++;         /*and and make the current item more visible:*/         addActive(x);       } else if (e.keyCode == 38) { //up         /*If the arrow UP key is pressed,         decrease the currentFocus variable:*/         currentFocus--;         /*and and make the current item more visible:*/         addActive(x);       } else if (e.keyCode == 13) {         /*If the ENTER key is pressed, prevent the form from being submitted,*/         e.preventDefault();         if (currentFocus > -1) {           /*and simulate a click on the "active" item:*/           if (x) x[currentFocus].click();         }       }   });   function addActive(x) {     /*a function to classify an item as "active":*/     if (!x) return false;     /*start by removing the "active" class on all items:*/     removeActive(x);     if (currentFocus >= x.length) currentFocus = 0;     if (currentFocus < 0) currentFocus = (x.length - 1);     /*add class "autocomplete-active":*/     x[currentFocus].classList.add("autocomplete-active");   }   function removeActive(x) {     /*a function to remove the "active" class from all autocomplete items:*/     for (var i = 0; i < x.length; i++) {       x[i].classList.remove("autocomplete-active");     }   }   function closeAllLists(elmnt) {     /*close all autocomplete lists in the document,     except the one passed as an argument:*/     var x = document.getElementsByClassName("autocomplete-items");     for (var i = 0; i < x.length; i++) {       if (elmnt != x[i] && elmnt != inp) {       x[i].parentNode.removeChild(x[i]);     }   } } /*execute a function when someone clicks in the document:*/ document.addEventListener("click", function (e) {     closeAllLists(e.target); }); }