JSFiddle - React, Tailwind, and code Playground

HTML

Transporte : <input type="text" id="transporte" value="">
<button id="btnSend" onclick="javascript:checkValue();">Send</button>

JavaScript

function checkValue() {    
  var _transporteNode = document.getElementById("transporte");
  if(_transporteNode) {      
      _transporteNode.value = _transporteNode.value || 0;
  }
}