JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id='my_text'>

CSS

#my_text {
    border: 1px solid black;
    
    
}

JavaScript

(function(){
  var text = document.getElementById("my_text"),
      testText;
      text.onkeyup          =  function testKey(){
         var testText       =  text.value;
          if(testText*1 + 0  !=  text.value){
            text.value      = testText.substring(0, testText.length - 1) 
            
          }
    
    
    
    
      }


})()