class {
    onInput(input) {
        this.state = {
            counter: 1
        }
    }

    increment() {
        this.state.counter++;
    }
}

<div>
    <input type='text'
        placeholder="What are you looking for?"
        tabindex=1
        class='input'
        autocomplete='off'
        key='searchInput'>

    <button type='button' class='btn btn-search'></button>
</div>