Tag input field

Tag input fields have become a common feature in modern web applications. They allow users to add multiple tags to a form or search field. While this all might sound complicated, it's actually fairly simple to implement with React.

Starting with the component's props, we'll only need to store the initial tags array in a state variable. Then, using Array.prototype.map(), we'll render the list of tags. The addTagData method will be called when the user presses the Enter key, and the removeTagData method will be called when the user clicks the delete icon in the tag.

.tag-input {
  display: flex;
  flex-wrap: wrap;
  min-height: 48px;
  padding: 0 8px;
  border: 1px solid #d6d8da;
  border-radius: 6px;
}

.tag-input input {
  flex: 1;
  border: none;
  height: 46px;
  font-size: 14px;
  padding: 4px 0 0;
}

.tag-input input:focus {
  outline: transparent;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  margin: 8px 0 0;
}

.tag {
  width: auto;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  padding: 0 8px;
  font-size: 14px;
  list-style: none;
  border-radius: 6px;
  margin: 0 8px 8px 0;
  background: #0052cc;
}

.tag-title {
  margin-top: 3px;
}

.tag-close-icon {
  display: block;
  width: 16px;
  height: 16px;
  line-height: 16px;
  text-align: center;
  font-size: 14px;
  margin-left: 8px;
  color: #0052cc;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
}

const TagInput = ({ tags }) => {
  const [tagData, setTagData] = React.useState(tags);

  const removeTagData = indexToRemove => {
    setTagData([...tagData.filter((_, index) => index !== indexToRemove)]);
  };

  const addTagData = event => {
    if (event.target.value !== '') {
      setTagData([...tagData, event.target.value]);
      event.target.value = '';
    }
  };

  return (
    <div className="tag-input">
      <ul className="tags">
        {tagData.map((tag, index) => (
          <li key={index} className="tag">
            <span className="tag-title">{tag}</span>
            <span
              className="tag-close-icon"
              onClick={() => removeTagData(index)}
            >
              x
            </span>
          </li>
        ))}
      </ul>
      <input
        type="text"
        onKeyUp={event => (event.key === 'Enter' ? addTagData(event) : null)}
        placeholder="Press enter to add a tag"
      />
    </div>
  );
};

ReactDOM.createRoot(document.getElementById('root')).render(
  <TagInput tags={['Nodejs', 'MongoDB']} />
);