JSFiddle - React, Tailwind, and code Playground

by joshkrz

HTML

<input id="UserName"></input>

JavaScript

$("input#UserName").on({
  keydown: function(e) {
    if (e.which === 32)
      return false;
  },
  change: function() {
    this.value = this.value.replace(/\s/g, "");
  }
});