without form tag field value serialize in javascript code example

Example 1: jquery form serialize object

$(function(){
  $('form').on('submit', function(e){
    e.preventDefault();
    $(this).serializeObject().done(function(o){
      if(window.console) console.log(o);
      var j = JSON.stringify(o);
      alert(j);
      //window.open("data:image/png;base64," + o.userfile.data);
    });
  });
});

Example 2: get serialize data javascript

// HTML
<form id="myForm" name="myForm">
  <div>
    <label for="username">Enter name:</label>
    <input type="text" id="username" name="username">
  </div>
  <button type="button" onclick="clickMe()">Click</button>
</form>

// JS
function clickMe(){
  let myForm = document.getElementById('myForm');
  let formData = new FormData(myForm);
  console.log(formData.get('username'));
}