display a notice if bower dependencies fail to load for the checkup page

3 years ago · e5df9cb730
parent 404b89eb28
commit e5df9cb730
2 changed files with 18 additions and 0 deletions
--- a/www/checkup/dependency-warning.js
+++ b/www/checkup/dependency-warning.js
@ -0,0 +1,17 @@
+(function () { 
+    var first = true;
+    window.addEventListener('error', function (ev) {
+        if (!ev) { return; }
+        var srcElement = ev.srcElement;
+        if (!srcElement) { return; }
+        var nodeName = srcElement.nodeName;
+        if (nodeName !== 'SCRIPT') { return; }
+        var src = srcElement.src;
+        if (!/\/bower_components\/.*/.test(src)) { return; }
+        if (first) {
+            document.write(`<p>It's possible that this server's administrators forgot to install its client-side dependencies with 'bower update'.</p>`);
+            first = false;
+        }
+        document.write(`<p>Failed to load <code>${src}</code>.</p>`);
+    }, true);
+}());
--- a/www/checkup/index.html
+++ b/www/checkup/index.html
@ -3,6 +3,7 @@
 <head>
    <meta content="text/html; charset=utf-8" http-equiv="content-type"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+    <script type="text/javascript" src="/checkup/dependency-warning.js?ver=1.0.0"></script>
    <script data-bootload="main.js" data-main="/common/boot.js" src="/bower_components/requirejs/require.js"></script>
 </head>
 <body>