https://www.nakheel.com/WebResource.axd?d=cEyaHB4L9TinzO2e3D0MeRGX…msrNMFbFKn5543hoEZ4OA0&t=638979472620000000

1(function () {
2    const submitBtnSelector = "button[type='submit'], input[type='submit']";
3    window.addEventListener('load', (event) => {
4        document.querySelectorAll(submitBtnSelector).forEach(i => {
5            i.addEventListener("click", (event) => {
6                event.preventDefault();
7                const btn = event.target;
8                if (btn.getAttribute('disabled') === 'disabled')
9                    return;
10                btn.setAttribute('disabled', 'disabled');
11                setAntiforgeryTokens().then(() => {
12                    const form = btn.closest('form');
13                    form.requestSubmit(btn);
14                    btn.removeAttribute('disabled');
15                }, err => {
16                    console.log('Antiforgery token retrieval failed: ' + err);
17                    btn.removeAttribute('disabled');
18                });
19            }, false);
20        });
21    });
22
23    function setAntiforgeryTokens() {
24        return new Promise((resolve, reject) => {
25            const service = document.querySelector("input[name='antiCsrfService'").value;
26            const headerName = document.querySelector("input[name='antiCsrfCustomHeaderName'").value;
27            let xhr = new XMLHttpRequest();
28            xhr.open('GET', service);
29            xhr.setRequestHeader(headerName, 'true')
30            xhr.responseType = 'json';
31            xhr.onload = function () {
32                const response = xhr.response;
33                if (response != null) {
34                    const token = response.Value;
35                    document.querySelectorAll("input[name='sf_antiforgery']").forEach(i => i.value = token);
36                    resolve();
37                }
38                else {
39                    reject();
40                }
41            };
42            xhr.onerror = function () { reject(); };
43            xhr.send();
44        });
45    }
46})();