https://www.cloudbolt.io/wp-content/themes/cloudbolt/assets/js/helper/check-loaded-script.js?ver=6ab2c2030e6af

1/**
2 * Mark/store the script as fully loaded in a global variable.
3 * @param src URL of the script
4 */
5function markScriptFullyLoaded(src) {
6  if(typeof window.scriptLoadMap !== "undefined")
7    window.scriptLoadMap[src] = true;
8  else {
9    window.scriptLoadMap = [];
10    window.scriptLoadMap[src] = true;
11  }
12}
13
14/**
15 * Returns true if the script has been added to the page
16 * @param src URL of the script
17 */
18function isScriptAdded(src) {
19  return Boolean(document.querySelector('script[src="' + src + '"]'));
20}
21
22/**
23 * Returns true if the script has been fully loaded
24 * @param src URL of the script
25 */
26function isScriptFullyLoaded(src) {
27  if(typeof window.scriptLoadMap !== "undefined")
28    return window.scriptLoadMap[src];
29  else
30    return false;
31}
32
33/**
34 * Load a script.
35 * @param src URL of the script
36 * @param onLoadCallback Callback function when the script is fully loaded
37 * @param onLoadErrorCallback Callback function when the script fails to load
38 * @param retryCount How many times retry laoding the script? (Not implimented here. Logic goes into js.onerror function)
39 */
40function loadScript(src, onLoadCallback, onLoadErrorCallback, retryCount) {
41  if (!src) return;
42
43  // Check if the script is already loaded
44  if (isScriptAdded(src)) {
45    // If script already loaded successfully, trigger the callback function
46    if (onLoadCallback) onLoadCallback();
47
48    console.warn("Script already loaded. Skipping: ", src);
49    return;
50  }
51
52  // Loading the script...
53  const js = document.createElement("script");
54  js.src = src;
55
56  js.onload = () => {
57    markScriptFullyLoaded(src);
58
59    // Optional callback on script load
60    if (onLoadCallback) onLoadCallback();
61  };
62
63  js.onerror = () => {
64    // Remove the script node (to be able to try again later)
65    const js2 = document.querySelector('script[src="' + src + '"]');
66    js2.parentNode.removeChild(js2);
67
68    // Optional callback on script load failure
69    if (onLoadErrorCallback) onLoadErrorCallback();
70  };
71
72  document.head.appendChild(js);
73
74}