https://youexec.com/assets/javascripts/landing/sticky-url-params.js?20260531

1
2// Check if something is empty
3function isEmpty(str) {
4    return !str || 0 === str.length;
5}
6
7// List of invalid parameters to not make sticky like wistia, 404 etc
8var invalidParams = ["v", "wtime", "offset", "reversePaginate", "seek_to_second_number", "404"];
9
10$(document).ready(function () {
11
12    // Add alert codes param key to the invalid params list
13    if (typeof acKey !== 'undefined' && !isEmpty(acKey)) {
14        invalidParams.push(acKey);
15    }
16
17    // Add search query param key to the invalid params list
18    if (typeof sqKey !== 'undefined' && !isEmpty(sqKey)) {
19        invalidParams.push(sqKey);
20    }
21
22    // Init
23    initParameterSticky();
24});
25
26/**
27 * Initializes sticky parameters for the page.
28 * - Retrieves current URL query parameters excluding the "invalidParams"
29 * - Builds a new query string with updated parameters.
30 * - Updates all internal links on the page, adding or updating their query parameters.
31 *   This includes handling existing query parameters in links to avoid duplicates.
32 *   If both the page URL and anchor link have same param key, we give priority to anchor one
33 */
34function initParameterSticky() {
35
36    // Retrieve query string of parameters from the current page's URL
37    var pageQs = window.location.search;
38    var pageParams = getQueryParams(pageQs);
39
40    // Encode email once before the loop (skip if already encoded)
41    if (typeof emailKey !== 'undefined' && !isEmpty(pageParams[emailKey]) && !isBase64UrlEncoded(pageParams[emailKey])) {
42        pageParams[emailKey] = base64UrlEncode(pageParams[emailKey]);
43    }
44
45    // Get all links on the page
46    var ye_links = document.getElementsByTagName("a");
47
48    // Loop through all the links on the page
49    for (var i = 0; i < ye_links.length; i++) {
50        var ye_link = ye_links[i];
51
52        // Skip links without href attribute
53        if (!ye_link.hasAttribute('href') || !ye_link.href) {
54            continue;
55        }
56
57        // Skip certain types of links
58        if (
59            ye_link.getAttribute('href').startsWith("#") ||
60            ye_link.href.startsWith("tel:") ||
61            ye_link.href.startsWith("sms:") ||
62            ye_link.href.startsWith("mailto:")
63        ) {
64            continue;
65        }
66
67        // Parse existing query parameters in the link
68        var linkUrl = new URL(ye_link.href, window.location.origin);
69        var linkParams = getQueryParams(linkUrl.search);
70
71        // Add page params to this link
72        for (var key in pageParams) {
73
74            // Skip invalid params
75            if (invalidParams.includes(key)) { continue; }
76
77           // Only add if the link doesn't already have this parameter
78            if (!(key in linkParams)) {
79                linkParams[key] = pageParams[key];
80            }
81        }
82
83        // Reconstruct the link's URL with updated query parameters
84        linkUrl.search = buildQueryString(linkParams);
85        ye_link.href = linkUrl.href;
86    }
87}
88
89// Used to convert query param to object
90function getQueryParams(query) {
91    const qs = query.replace(/^\?/, "");
92    const params = {};
93
94    if (!isEmpty(qs)) {
95        qs.split("&").forEach((param) => {
96            const [key, value] = param.split("=");
97            params[decodeURIComponent(key)] = decodeURIComponent(value);
98        });
99    }
100
101    return params;
102}
103
104// URL-safe Base64 encode to match Java's Base64.encodeBase64URLSafe (replaces + with -, / with _, and strips = padding)
105function base64UrlEncode(str) {
106    return btoa(str).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
107}
108
109// Returns true if the value is already Base64 URL-safe encoded (i.e. only contains valid Base64 URL-safe characters)
110function isBase64UrlEncoded(str) {
111    return /^[A-Za-z0-9\-_]+$/.test(str);
112}
113
114// Used to convert object to string query
115function buildQueryString(params) {
116    if (Object.keys(params).length === 0) { return ""; }
117    return Object.keys(params).map((key) => `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`).join("&");
118}