JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="onlyBinary" id='onlyBinary'>

JavaScript

var bindEvent = function( element, type, eventHandler ) {
  if ( element.addEventListener ) {
    element.addEventListener( type, eventHandler, false );
  } else if ( element.attachEvent ) {
    element.attachEvent( "on" + type, eventHandler );    
  }
};

bindEvent(document.getElementById('onlyBinary'), "keypress", function (event) {   
  if (event.which != 49 && event.which != 48) {
    event.preventDefault();
  }
});