Vue.js listen for keypress example for Norcius

script.js

let app = new Vue({
    el: '#app',
    methods: {
        isAlpha: function (ch) {
            return /^[A-Z]$/i.test(ch);
        },
        checkForLetter(letter) {
            console.log(letter);
        }
    },
    mounted() {
        window.addEventListener('keypress', function (e) {
            if (this.isAlpha(event.key)) {
                this.checkForLetter(event.key.toUpperCase())
            }
        }.bind(this));
    }
});