forms.js

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);
	});
  }
  
  /*An array containing all the country names in the world:*/
  var airports = ["کرمان","سیستان و بلوچستان","خراسان جنوبی","فارس","خراسان رضوی","اصفهان","سمنان","یزد","هرمزگان","خوزستان","آذربایجان شرقی","آذربایجان غربی","کردستان","مرکزی","خراسان شمالی","لرستان","کرمانشاه","مازندران","بوشهر","گلستان","ایلام","همدان","زنجان","اردبیل","چهارمحال","قزوین","کهگیلویه","گیلان","تهران","قم","البرز"
  ];
  /*initiate the autocomplete function on the "myInput" element, and pass along the countries array as possible autocomplete values:*/
  autocomplete(document.getElementById("myInput"), airports);
  autocomplete(document.getElementById("myInput2"), airports);