https://hpmedical.com.bo/modules/vgmpagos/views/js/vgmpagos.js

1function setWaitLoader() {
2    var vgmpagosWaitMessage = document.getElementById("vgmpagosWaitMessage");
3    if (vgmpagosWaitMessage) {
4        vgmpagosWaitMessage.style.display = "inline-block";
5    }
6}
7function loadPaymentHandle() {
8    var bodyId = document.body.id;
9    if ((bodyId == "checkout")) {
10        console.log("bodyId: " + bodyId);
11        var buttons = document.getElementsByTagName("button");
12        for (var i = 0; i < buttons.length; i++) {
13            if (buttons[i].type == "submit") {
14                window.addEventListener('beforeunload', function (e) { setWaitLoader(); });
15                console.log("setWaitLoader listener set");
16                break;
17            }
18        }
19    }
20}
21window.addEventListener("load", loadPaymentHandle, false);