How to Create Dropdown List with Autocomplete Options in HTML with Video Demo

Hello friend! Today we learn together about difference between Simple Dropdown List and Dropdown List with Autocomplete Search in HTML with code examples and video tutorial in Khmer!

Watch Video Tutorial (Khmer)

Watch video first to see step-by-step how to build autocomplete dropdown in HTML:

1. Difference: <select> vs <datalist>

• Simple Dropdown (<select>) : User can only click and pick one item from fixed list. Read our guide on Everything about Dropdown List in HTML.
• Autocomplete Dropdown (<datalist>) : User can type any letter, and HTML will filter matching suggestions automatically while user typing! Read the official MDN Datalist Documentation.

2. Simple Dropdown List using <select> Tag

Here is standard dropdown box code:

<label for="browser-select">Choose your browser:</label>
<select id="browser-select" name="browser">
  <option value="chrome">Chrome</option>
  <option value="firefox">Firefox</option>
  <option value="safari">Safari</option>
  <option value="edge">Edge</option>
</select>

Rendered Output Preview:

3. Dropdown List with Autocomplete using <datalist> Tag

Here is how you build autocomplete dropdown with <input> and <datalist>:

<!-- Step 1: Create input box with list attribute -->
<label for="browser-choice">Choose or type a browser:</label>
<input
  list="browsers"
  id="browser-choice"
  name="browser"
  placeholder="Type to search browser..."
/>

<!-- Step 2: Create datalist box with ID matching list attribute -->
<datalist id="browsers">
  <option value="Chrome">
  <option value="Firefox">
  <option value="Safari">
  <option value="Microsoft Edge">
  <option value="Opera">
  <option value="Brave">
</datalist>

Rendered Output Preview (Try typing inside box!):

Tips & Tricks for Autocomplete Dropdown

Here are super helpful tips to remember when using <datalist>:

Tip 1: ID and List Attribute MUST Match Exactly!

The list attribute value inside <input list="browsers"> MUST be 100% same as id="browsers" inside <datalist id="browsers">. If spelling is different, autocomplete will not pop up!

Tip 2: Add placeholder for Good User Experience

Always add placeholder="Type to search..." on the <input> element so user immediately knows they can type text inside box!

Tip 3: User Can Type Custom Value Too!

Unlike <select> tag which locks user choice, <datalist> allows user to choose from list OR type their own new custom text value if their option is missing.

💡 Next Lesson: Build interactive form logic with How to Create Simple Calculator in HTML Without JavaScript!

Happy coding! Practice writing both tags in VS Code editor to master HTML forms!