JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="field_results"/><br>

<input type="checkbox" value="1">1<br>
<input type="checkbox" value="2">2<br>
<input type="checkbox" value="3">3

JavaScript

$(document).ready(function(){
    $(":checkbox").on('click', function() {
        if($(':checkbox:checked')) {
            var fields = $(":checkbox").val();
            jQuery.each( fields, function( i, field ) {
               $('#field_results').val($('#field_results').val() + field.value + " ");        
            });        
        }
    });
});