Bootstrap modal form in v4

[admoore]

I have a form within a modal which sends an email...
While it works in Bootstrap 3, in v4 I get a javascript console error:

Uncaught TypeError: $.ajax is not a function

Any help on resolving appreciated very much.
TIA,
-allen_m

The function:

<script>
function submitContactForm(){
    var reg = /^[A-Z0-9._%+-]+@([A-Z0-9-]+\.)+[A-Z]{2,4}$/i;
    var name = $('#inputName').val();
    var email = $('#inputEmail').val();
    var message = $('#inputMessage').val();
    if(name.trim() === '' ){
        alert('Please enter your name.');
        $('#inputName').focus();
        return false;
    }else if(email.trim() === '' ){
        alert('Please enter your email.');
        $('#inputEmail').focus();
        return false;
    }else if(email.trim() !== '' && !reg.test(email)){
        alert('Please enter valid email.');
        $('#inputEmail').focus();
        return false;
    }else if(message.trim() === '' ){
        alert('Please enter your message.');
        $('#inputMessage').focus();
        return false;
    }else{
        $.ajax({
            type:'POST',
            url:'./include/sendEmail.php',
            data:'contactFrmSubmit=1&name='+name+'&email='+email+'&message='+message,
            beforeSend: function () {
                $('.submitBtn').attr("disabled","disabled");
                $('.modal-body').css('opacity', '.5');
            },
            success:function(msg){
                if(msg == 'ok'){
                    $('#inputName').val('');
                    $('#inputEmail').val('');
                    $('#inputMessage').val('');
                    $('.statusMsg').html('<span style="color:green;">Message sent.</p>');
                }else{
                    $('.statusMsg').html('<span style="color:red;">An error occurred, please try again.</span>');
                }
                $('.submitBtn').removeAttr("disabled");
                $('.modal-body').css('opacity', '');
            }
        });
    }
}
</script>

 

[admoore]

SOLVED...

Had to change to FULL jQuery cdn instead of slim build...