wp_ajax_modal_swal_and_loading_overlay.js

    $('.mail-box-2').click(function(event){
        $('.modal_historique_id').val($(this).data("historique_id"));
    });

    $('#historique_send').click( function(event){
        $.LoadingOverlay("show");
        var email = $('.historique-custom-input').val();
        // var historique_id = $("#envelope").data("historique_id")
        var historique_id = $('.modal_historique_id').val();
        event.preventDefault();
       $.ajax({
           url: WCP_Ajax.ajaxurl,
           type: 'POST',
           data: {
                action: 'send_history_email',
                email: email,
                historique_id: historique_id,
            },
       })
       .done(function(response) {
            $.LoadingOverlay("hide");
            $('#mailModal').modal('toggle');
            if (response.success == false) {
                swal("Sorry!", response.data.message , "error");
            }
            else {
                swal("Great!", response.data.message, "success");
            }
            
       })
    });