The following code works perfectly to display the autocomplete options in an HTML form field:
function fruitautocomplete(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 fruitlist = [
"Apple",
"Mango",
"Pear",
"Banana",
"Berry"
];
/*initiate the autocomplete function on the "myFruitList" element, and pass along the fruit array as possible autocomplete values:*/
autocomplete(document.getElementById("myFruitList"), fruitlist);
* {
box-sizing: border-box;
}
body {
background-color: #f1f1f1;
}
#regForm {
background-color: #ffffff;
margin: 10px auto;
font-family: Raleway;
padding: 10px;
width: 90%;
min-width: 300px;
}
h1 {
text-align: center;
}
input {
padding: 10px;
width: 100%;
font-size: 17px;
font-family: Raleway;
border: 1px solid #aaaaaa;
}
/* Mark input boxes that gets an error on validation: */
input.invalid {
background-color: #ffdddd;
}
/* Hide all steps by default: */
.tab {
display: none;
}
button {
background-color: #04AA6D;
color: #ffffff;
border: none;
padding: 10px 20px;
font-size: 17px;
font-family: Raleway;
cursor: pointer;
}
button:hover {
opacity: 0.8;
}
#prevBtn {
background-color: #bbbbbb;
}
/* Make circles that indicate the steps of the form: */
.step {
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbbbbb;
border: none;
border-radius: 50%;
display: inline-block;
opacity: 0.5;
}
.step.active {
opacity: 1;
}
/* Mark the steps that are finished and valid: */
.step.finish {
background-color: #04AA6D;
}
<form id="regForm" action="/submit_page.php">
<h1>Your Nutrition Needs:</h1>
<div class="tab">Your Fruit:
<p class="autocomplete">
<input id="myFruitList" type="text" name="fruit" placeholder="Start typing your fruit name"></p>
</div>
</form>
I think you are looking for functionality which is on the "Symbol" field of the form on this page: https://zerodha.com/margin-calculator/SPAN/
It has the standard drop-down, when cursor place it shows all possible entries (1) plus a search box, it does anywhere string search match (2), and may be (3) is also available. Check its source code to see if that helps.
Thank you
I managed to find a simple answer, and its a moral obligation on my part to post it for everyone's benefit :-)
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.full.min.js"></script>
<hr>
<select class="js-example-basic-single" name="state">
<option value="AL">Alabama</option>
<option value="NY">New York</option>
<option value="WY">Wyoming</option>
</select>
<script>
$(document).ready(function() {
$('.js-example-basic-single').select2();
});
</script>
For more details, check https://select2.org/ documentation
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