How send form using AJAX on clicked Finish button?

[lc1000bkycm]

This code not working. I don't know where is mistake?

function onFinishCallback(obj, context) {
        if(validateAllSteps()){
            $.ajax({
                type: "POST",
                url: 'register.php',
                data: $('#trainer-register').serialize(),
                dataType: 'json',
                cache: false,
                success: function(response) 
                {

                }
            }); 

       }
    }