JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="name"/>
  <input type="text" id="number"/>
  <button id="getvalue">Get value</button>

JavaScript

$(document).ready( function(){
     
    $('#getvalue').click( function() {
       
        var nameVal = $('#name').val();
        var numVal = $('#number').val();
        
        if(nameVal == '' || numVal == ''){
            alert('Inputs are empty.');
        }else{
        	alert('Name is ' + nameVal + ' and Number is ' + numVal);
        }
     
    });
});