How to use Checkbox inside Select Option using JavaScript ?

Given an HTML document and the task is to add the Checkbox inside select option using JavaScript.

Approach:

  • Create a select element that shows “Select options” and also create a div that contains CheckBoxes and style that using CSS.
  • Add javaScript functionality which is called when the user clicks on div that contains the select element.

Syntax:

function showCheckboxes() {
    var checkboxes = document.getElementById("checkBoxes");

    if (show) {
        checkboxes.style.display = "block";
        show = false;
    } else {
        checkboxes.style.display = "none";
        show = true;
    }
}

Complete code:

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<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to use Checkbox inside Select 
        Option using JavaScript?
    </title>
  
    <style>
        h1 {
            color: green;
        }
  
        .multipleSelection {
            width: 300px;
            background-color: #BCC2C1;
        }
  
        .selectBox {
            position: relative;
        }
  
        .selectBox select {
            width: 100%;
            font-weight: bold;
        }
  
        .overSelect {
            position: absolute;
            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
        }
  
        #checkBoxes {
            display: none;
            border: 1px #8DF5E4 solid;
        }
  
        #checkBoxes label {
            display: block;
        }
  
        #checkBoxes label:hover {
            background-color: #4F615E;
        }
    </style>
</head>
  
<body>
    <h1>GEEKSFORGEEKS</h1>
  
    <h2>Use CheckBox inside Select Option</h2>
  
    <form>
        <div class="multipleSelection">
            <div class="selectBox" 
                onclick="showCheckboxes()">
                <select>
                    <option>Select options</option>
                </select>
                <div class="overSelect"></div>
            </div>
  
            <div id="checkBoxes">
                <label for="first">
                    <input type="checkbox" id="first" />
                    checkBox1
                </label>
                  
                <label for="second">
                    <input type="checkbox" id="second" />
                    checkBox2
                </label>
                <label for="third">
                    <input type="checkbox" id="third" />
                    checkBox3
                </label>
                <label for="fourth">
                    <input type="checkbox" id="fourth" />
                    checkBox4
                </label>
            </div>
        </div>
    </form>
  
    <script>
        var show = true;
  
        function showCheckboxes() {
            var checkboxes = 
                document.getElementById("checkBoxes");
  
            if (show) {
                checkboxes.style.display = "block";
                show = false;
            } else {
                checkboxes.style.display = "none";
                show = true;
            }
        }
    </script>
</body>
  
</html>

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Output:

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