only load custom.js if present

Author: netbymatt

server/scripts/custom.sample.js

@@ -2,13 +2,24 @@
 // it is intended to allow for customizations that do not get published back to the git repo
 // for example, changing the logo
 
-// start running after all content is loaded
-document.addEventListener('DOMContentLoaded', () => {
+const customTask = () => {
 	// get all of the logo images
 	const logos = document.querySelectorAll('.logo img');
 	// loop through each logo
 	logos.forEach((elem) => {
 		// change the source
 		elem.src = 'my-custom-logo.gif';
 	});
+};
+
+// start running after all content is loaded, or immediately if page content is already loaded
+if (document.readyState === 'loading') {
+	// Loading hasn't finished yet
+	document.addEventListener('DOMContentLoaded', customTask);
+} else {
+	// `DOMContentLoaded` has already fired
+	customTask();
+}
+document.addEventListener('DOMContentLoaded', () => {
+
 });

server/scripts/index.mjs

@@ -9,6 +9,7 @@ import settings from './modules/settings.mjs';
 
 document.addEventListener('DOMContentLoaded', () => {
 	init();
+	getCustomCode();
 });
 
 const categories = [
@@ -413,3 +414,15 @@ const fullScreenResizeCheck = () => {
 	// store state of fullscreen element for next change detection
 	fullScreenResizeCheck.wasFull = !!document.fullscreenElement;
 };
+
+const getCustomCode = async () => {
+	// fetch the custom file and see if it returns a 200 status
+	const response = await fetch('scripts/custom.js', { method: 'HEAD' });
+	if (response.ok) {
+		// add the script element to the page
+		const customElem = document.createElement('script');
+		customElem.src = 'scripts/custom.js';
+		customElem.type = 'text/javascript';
+		document.body.append(customElem);
+	}
+};

views/index.ejs

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!DOCTYPE html>
 
 <html lang="en" xmlns="http://www.w3.org/1999/xhtml">
 
@@ -20,7 +20,6 @@
   <script type="text/javascript" src="resources/data.min.js?_=<%=production%>"></script>
   <script type="text/javascript" src="resources/vendor.min.js?_=<%=production%>"></script>
   <script type="text/javascript" src="resources/ws.min.js?_=<%=production%>"></script>
-  <script type="text/javascript" src="scripts/custom.js?_=<%=production%>"></script>
   <% } else { %>
   <link rel="stylesheet" type="text/css" href="styles/main.css" />
   <script type="text/javascript" src="scripts/vendor/auto/jquery.js"></script>
@@ -45,14 +44,10 @@
   <script type="module" src="scripts/modules/radar.mjs"></script>
   <script type="module" src="scripts/modules/settings.mjs"></script>
 	<script type="module" src="scripts/index.mjs"></script>
-	<script type="text/javascript" src="scripts/custom.js"></script>
   <!-- data -->
   <script type="text/javascript" src="scripts/data/travelcities.js"></script>
   <script type="text/javascript" src="scripts/data/regionalcities.js"></script>
   <script type="text/javascript" src="scripts/data/stations.js"></script>
-
-  <script type="text/javascript" src="scripts/custom.js"></script>
-
   <% } %>
 
 </head>