JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text' id='email_address'>
<input type='text' id='password'>
<input type='button' value='go' id='dostuff'>

JavaScript

$('#dostuff').click(function(){
    var email_address = $("#email_address").val(); 
    var password =  $("#password").val();
    
    var postData = {
      'email' : email_address,
      'password' : password,
      'html' : 'PASS'
    };
    
    $.post('/echo/html/', postData, function(data){
        //This should be JSON preferably. but can't get it to work on jsfiddle
        //Depending on what your controller returns you can change the action
        if (data == 'PASS') { 
            alert('login pased');
        } else {
            alert('login failed');
        }
    });
});