How to Build a Tag Input Field Component for React App

How to Build a Tag Input Field Component for React App

In this React tutorial, you'll learn how to build a tag input field component for your React app

Ever wonder how to build a tag input field component for your React app? Here’s a quick tutorial to show you how.

First, let’s start with a visual representation of the markup that we are going to implement. We need a container wrapping both tags and an input field. As we add more tags, the input field is forced further to the right, which gives the feeling of adding the tags into the input field.

Tags to the Right of the Input Field

A pseudo markup corresponding to the visualization above would be something like the following.

<div className="container">
  {tags.map((tag) => <div>{tag}</div>)}
  <input/>
</div>

At this point, it is clear that we need a state variable to store the entered tags, as well as another state variable to control the input field. input and tags states will be empty string and empty array by default respectively.

const [input, setInput] = useState('');
const [tags, setTags] = useState([]);

The next thing we need is to listen to changes on the input field so that we can set the input state and create a logic to populate the tags state when a certain key is pressed. Let’s assume we want to separate the tags with comma key, so when that key is pressed, we will push the content of input state as a new value to tags array.

To do that, we need to use onChange and onKeyDown events. So now our markup changes a little bit with the new attributes added:

<div className="container">
  {tags.map((tag) => <div className="tag">{tag}</div>)}
  <input
    value={input}
    placeholder="Enter a tag"
    onKeyDown={onKeyDown}
    onChange={onChange}
  />
</div>

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