https://mbbs-in-bangladesh.in/utmProvider.js

1document.addEventListener("DOMContentLoaded", function () {
2
3    const STORAGE_KEY = "persistQuery";
4
5    if (location.search) {
6
7        const current = new URLSearchParams(location.search);
8        const utm = new URLSearchParams();
9
10        current.forEach((v, k) => {
11            if (
12                k.startsWith("utm_") ||
13                k === "autm_id" ||
14                k === "gclid" ||
15                k === "fbclid"
16            ) {
17                utm.set(k, v);
18            }
19        });
20
21        if (utm.toString()) {
22            sessionStorage.setItem(STORAGE_KEY, utm.toString());
23        }
24
25    } else {
26        sessionStorage.removeItem(STORAGE_KEY);
27        return;
28    }
29
30    const saved = sessionStorage.getItem(STORAGE_KEY);
31    if (!saved) return;
32
33    document.querySelectorAll("a[href]").forEach(function(link){
34
35        let href = link.getAttribute("href");
36
37        if(
38            !href ||
39            href.startsWith("#") ||
40            href.startsWith("javascript:") ||
41            href.startsWith("mailto:") ||
42            href.startsWith("tel:")
43        ){
44            return;
45        }
46
47        const url = new URL(href, location.origin);
48
49        const params = new URLSearchParams(saved);
50
51        params.forEach((v,k)=>{
52            if(!url.searchParams.has(k)){
53                url.searchParams.set(k,v);
54            }
55        });
56
57        link.href = url.pathname + "?" + url.searchParams.toString();
58    });
59
60});