get More informatio about submit event : https://api.jquery.com/submit/

<form id="uploadForm">
<input type="text" name="test">
<button type="submit">Upload</button>
</form>
<script>
$('#uploadForm').on('submit', function(e) {
    e.preventDefault(); // Prevent normal form submission
    var formData = new FormData(this);
    $.ajax({
        url: 'upload.php',
        type: 'POST',
        data: formData,
        contentType: false,
        processData: false,
        success: function(response) {
            $('#resultDiv').html(response);
        },
        error: function(xhr) {
            alert('Upload failed');
        }
    });
});
</script>
<div id="resultDiv"></div>