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Selected Reading
How to create a filter list with JavaScript?
JavaScript filter lists allow users to search and filter through data dynamically. This is commonly used for search functionality in websites and applications.
Complete HTML Example
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
* {
box-sizing: border-box;
}
.searchInput {
width: 100%;
font-size: 16px;
padding: 12px 20px 12px 40px;
border: 2px solid grey;
margin-bottom: 12px;
}
.animalUL {
list-style-type: none;
padding: 0;
margin: 0;
}
.animalUL li a {
border-top: 1px solid rgb(0, 0, 0);
margin-top: -1px;
background-color: #f6f6f6;
padding: 12px;
text-decoration: none;
font-size: 18px;
color: black;
display: block;
}
.animalUL li a:hover:not(.header) {
background-color: #eee;
}
</style>
</head>
<body>
<h1>Filter List Example</h1>
<input type="text" class="searchInput" onkeyup="filterFunction()" placeholder="Search for animals" title="Type in a name"/>
<ul class="animalUL">
<li><a href="#">Cat</a></li>
<li><a href="#">Cheetah</a></li>
<li><a href="#">Dog</a></li>
<li><a href="#">Giraffe</a></li>
<li><a href="#">Lion</a></li>
<li><a href="#">Leopard</a></li>
<li><a href="#">Llama</a></li>
</ul>
<script>
function filterFunction() {
var input, filter, ul, li, a, i, value;
input = document.querySelector(".searchInput");
filter = input.value.toUpperCase();
ul = document.querySelector(".animalUL");
li = ul.getElementsByTagName("li");
for (i = 0; i < li.length; i++) {
a = li[i].getElementsByTagName("a")[0];
value = a.textContent || a.innerText;
if (value.toUpperCase().indexOf(filter) > -1) {
li[i].style.display = "";
} else {
li[i].style.display = "none";
}
}
}
</script>
</body>
</html>
How It Works
The filter function performs these steps:
- Get input value: Retrieves the search term and converts to uppercase for case-insensitive matching
- Loop through list items: Iterates through each <li> element in the list
- Extract text content: Gets the text from each list item using textContent or innerText
- Match and display: Shows items containing the search term, hides others
Modern ES6 Version
<script>
function filterList() {
const input = document.querySelector('.searchInput');
const filter = input.value.toLowerCase();
const items = document.querySelectorAll('.animalUL li');
items.forEach(item => {
const text = item.textContent.toLowerCase();
item.style.display = text.includes(filter) ? '' : 'none';
});
}
document.querySelector('.searchInput').addEventListener('input', filterList);
</script>
Key Features
- Real-time filtering: Results update as user types
- Case-insensitive: Matches regardless of letter case
- Partial matching: Finds items containing the search term
- DOM manipulation: Uses display property to show/hide items
Output
The filter list displays all animals initially. When you type in the search box, only matching animals remain visible:
Conclusion
JavaScript filter lists provide an intuitive way to search through data. The key is using string methods like indexOf() or includes() with DOM manipulation to show/hide matching elements dynamically.
Updated on: 2026-03-15T23:18:59+05:30
595 Views
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