JSFiddle - React, Tailwind, and code Playground

HTML

<select name="" id="myId">
  <option value="city1">город1</option>
  <option value="city2">город2</option>
</select>

<input type="text" id="inputId">

JavaScript

$(function() {
  var elem = $('#myId'),
  		inputT = $('#inputId');
  elem.on('change', function(e) {
   updateVal($(this));
  });
  
  function updateVal($this) {
  	var elemV = $this.val();
   	var elemT = $this.find('option:checked').text();
    inputT.val( 'val: ' + elemV + ', text: ' + elemT );
  }
  updateVal(elem);
  
})