How to Create an AutoComplete Form using HTML, CSS and Java Script

Learn How to Create an AutoComplete Form using HTML, CSS and Java Script

Step 1) Add HTML:

<!--Make sure the form has the autocomplete function switched off:-->
<form autocomplete="off" action="/action_page.php">
  <div class="autocomplete" style="width:300px;">
    <input id="myInput" type="text" name="myCountry" placeholder="Country">
  </div>
  <input type="submit">
</form>

Step 2) Create a JavaScript Array:

var countries = ["Afghanistan","Albania","Algeria","Andorra","Angola","Anguilla","Antigua &amp; Barbuda","Argentina","Armenia","Aruba","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bangladesh","Barbados","Belarus","Belgium","Belize","Benin","Bermuda","Bhutan","Bolivia","Bosnia &amp; 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 &amp; 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 &amp; Nevis","St Lucia","St Vincent","Sudan","Suriname","Swaziland","Sweden","Switzerland","Syria","Taiwan","Tajikistan","Tanzania","Thailand","Timor L'Este","Togo","Tonga","Trinidad &amp; Tobago","Tunisia","Turkey","Turkmenistan","Turks &amp; 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"];

Step 3) Add CSS:

The container must have a “relative” positioning.

* { box-sizing: border-box; }
body {
  font: 16px Arial;
}
.autocomplete {
  /*the container must be positioned relative:*/
  position: relative;
  display: inline-block;
}
input {
  border: 1px solid transparent;
  background-color: #f1f1f1;
  padding: 10px;
  font-size: 16px;
}
input[type=text] {
  background-color: #f1f1f1;
  width: 100%;
}
input[type=submit] {
  background-color: DodgerBlue;
  color: #fff;
}
.autocomplete-items {
  position: absolute;
  border: 1px solid #d4d4d4;
  border-bottom: none;
  border-top: none;
  z-index: 99;
  /*position the autocomplete items to be the same width as the container:*/
  top: 100%;
  left: 0;
  right: 0;
}
.autocomplete-items div {
  padding: 10px;
  cursor: pointer;
  background-color: #fff;
  border-bottom: 1px solid #d4d4d4;
}
.autocomplete-items div:hover {
  /*when hovering an item:*/
  background-color: #e9e9e9;
}
.autocomplete-active {
  /*when navigating through the items using the arrow keys:*/
  background-color: DodgerBlue !important;
  color: #ffffff;
}

Step 4) Add JavaScript:

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);
});
}

Step 5) Initiate the Autocomplete Effect on “myInput”:

 <script>
autocomplete(document.getElementById("myInput"), countries);
</script>

Complete code would look like this:

<br /> See the Pen <a href="https://codepen.io/adaptabiz/pen/WNoRjVd">WNoRjVd</a> by adaptabiz<br /> (<a href="https://codepen.io/adaptabiz">@adaptabiz</a>) on <a href="https://codepen.io">CodePen</a>.<br />

How to Create an AutoComplete Form using HTML, CSS and Java Script

How to add Typing Effect / Type Writer Effect to your text Using JavaScript

By Richard / June 5, 2022

How to add Typing Effect / Type Writer Effect to your text Using JavaScript Step 1) Add HTML: <h1>Typewriter</h1>...

How to Create a full screen video background using HTML, CSS

By Richard / May 22, 2022

Learn How to Create a full screen video background using HTML, CSS Adding HTML <div class="videobg"> <video src="https://adaptabiz.com/wp-content/uploads/2021/05/Pexels-Videos-1234162.mp4" loop muted...

How to Create an Off-Canvas Menu / Side Bar Navigation

By Richard / April 29, 2022

How to Create an Off-Canvas Menu / Side Bar Navigation Step 1) Add HTML: <div id="mySidenav" class="sidenav"> <a href="javascript:void(0)" class="closebtn"...

How To Create a Coming Soon Page / Maintenance Page Using HTML, CSS and JavaScript

By Richard / April 19, 2022

How To Create a Coming Soon Page / Maintenance Page Using HTML, CSS and JavaScript Step 1 : Adding...

How to Create Weight Converter using HTML and JavaScript

By Richard / April 2, 2022

How to Create Weight Converter using HTML and JavaScript For Converting Pounds to Kilogram Adding HTML : <h2>Weight Converter Pound...

How to create a Scroll indicator with CSS and JavaScript

By Richard / February 19, 2022

How to create a Scroll indicator with CSS and JavaScript Step 1) Add HTML: <div class="header"> <h2>Scroll Indicator</h2> <div...

How to Convert Color image to Black & White using CSS Filter ( Color to Grayscale)

By Richard / February 15, 2022

Many a times, there is necessity of converting Color image into Black and White or Grayscale. Here in this very...

How to Create a JavaScript Countdown Timer

By Richard / February 4, 2022

There are many a times, when you’re going to need a countdown clock for your project. You may have an...

How to Create an Avatar image with CSS

By Richard / January 20, 2022

How to Create an Avatar image with CSS Step 1) Add HTML: <h2>How to create Avatar Images with CSS</h2> <img...

How to Change Background Images on Scroll with CSS.

By Richard / January 13, 2022

How to Change Background Images on Scroll with CSS. Step 1) Add HTML: <div class="bg-image img1"></div> <div class="bg-image img2"></div>...