JSFiddle - React, Tailwind, and code Playground

by Ting-Yuan Chang

HTML

<input type="text" class="inputCheck">
<input type="text" class="inputCheck">

JavaScript

var elements = document.querySelectorAll(".inputCheck");

for(var index=0;index< elements.length; ++index) {
  elements[index].addEventListener("keypress", function(event) {
    var keychar = String.fromCharCode(event.keyCode);
    var testStr = this.value + keychar;
    if(! /^\d+\.?\d?$/.test(testStr))
      event.preventDefault();
  })
}