JSFiddle - React, Tailwind, and code Playground
JavaScript
function addListItem(event) {
if(event.which == 13){
var text = $("#new-text").val();
$("#todolist").append('<li><input type="checkbox" class="done"/>'+text+'<button class="delete">Delete</button></li>');
$("#new-text").val('');
}
$(function() {
$("#add").on('keypress' , addListItem(this));
}