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How to Create a Custom Multiple Selection Dropdown Checklist with Checkboxes in HTML, CSS, and JavaScript?
How to Create a Custom Multiple Selection Dropdown Checklist with Checkboxes in HTML, CSS, and JavaScript?
Nov 17, 2024 am 02:12 AM
Creating Multiple Selection Dropdown Checklists
When creating a dropdown list, it's often desirable to allow users to select multiple options. Using HTML, this can be achieved by employing checkboxes within the dropdown options.
Conventional Dropdown with Checkboxes:
When adding checkboxes to a dropdown list without additional code, the checkboxes appear in front of the dropdown field. To change this, a more advanced approach is required.
Implementing a Custom Dropdown Checklist:
The following code snippet demonstrates how to create a custom dropdown checklist:
<div>
.dropdown-check-list {
display: inline-block;
}
.dropdown-check-list .anchor {
position: relative;
cursor: pointer;
display: inline-block;
padding: 5px 50px 5px 10px;
border: 1px solid #ccc;
}
.dropdown-check-list .anchor:after {
position: absolute;
content: "";
border-left: 2px solid black;
border-top: 2px solid black;
padding: 5px;
right: 10px;
top: 20%;
-moz-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
-o-transform: rotate(-135deg);
-webkit-transform: rotate(-135deg);
transform: rotate(-135deg);
}
.dropdown-check-list .anchor:active:after {
right: 8px;
top: 21%;
}
.dropdown-check-list ul.items {
padding: 2px;
display: none;
margin: 0;
border: 1px solid #ccc;
border-top: none;
}
.dropdown-check-list ul.items li {
list-style: none;
}
.dropdown-check-list.visible .anchor {
color: #0094ff;
}
.dropdown-check-list.visible .items {
display: block;
}
var checkList = document.getElementById('list1');
checkList.getElementsByClassName('anchor')[0].onclick = function(evt) {
if (checkList.classList.contains('visible'))
checkList.classList.remove('visible');
else
checkList.classList.add('visible');
};
Explanation:
- HTML: The HTML structure creates a basic dropdown with an anchor element representing the dropdown header and an unordered list containing the dropdown options with checkboxes.
- CSS: The CSS styles define the layout and appearance of the dropdown, including the checkbox styling and the display behavior of the dropdown options.
- JavaScript: The JavaScript code handles the opening and closing of the dropdown options when the anchor element is clicked.
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