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PiperOrigin-RevId: 702520489
googlecolab · Dec 14, 2024 · 68d05d7 · 68d05d7
1 parent cfe2b56
commit 68d05d7
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Showing 2 changed files with 40 additions and 2 deletions.
diff --git a/help.html b/help.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<html lang="en">
+  <head>
+    <title>Open in Colab</title>
+    <style>
+      body {
+        width: 20rem;
+      }
+    </style>
+  </head>
+  <body>
+    <p>
+      This page is not supported.
+    </p>
+    <p>
+      <a href="https://chromewebstore.google.com/detail/open-in-colab/iogfkhleblhcpcekbiedikdehleodpjo"
+          target="_blank" aria-label="Open in Colab (opens in new tab)">
+        Open in Colab
+      </a>
+      supports GitHub-hosted .ipynb files.
+    </p>
+  </body>
+</html>
diff --git a/service_worker.ts b/service_worker.ts
@@ -17,21 +17,35 @@
 
 import {githubToColabUrl} from './parse';
 
+// Details for calls to chrome.action.setPopup; see
+// https://developer.chrome.com/docs/extensions/reference/api/action#method-setPopup.
+const EMPTY_POPUP = {
+  popup: ''
+};
+const HELP_POPUP = {
+  popup: 'help.html'
+};
+
 // This listener is called when the user clicks the extension icon.
 //
 // If the current URL matches a Jupyter notebook hosted on github.com or on
 // gist.github.com, this function will open a new tab and load the notebook into
 // Colab.
-chrome.action.onClicked.addListener((tab: chrome.tabs.Tab) => {
+chrome.action.onClicked.addListener(async (tab: chrome.tabs.Tab) => {
   if (!tab.url) {
     console.warn('Open in Colab was invoked without a URL.');
     return;
   }
   const colabUrl = githubToColabUrl(tab.url);
   if (!colabUrl) {
+    // Set and show a helpful popup page when the extension icon is clicked on
+    // an invalid URL, then unset it in case the next click is valid.
+    await chrome.action.setPopup(HELP_POPUP);
+    await chrome.action.openPopup();
+    await chrome.action.setPopup(EMPTY_POPUP);
     console.warn(`Current page (${
         tab.url}) is not recognized as a GitHub-hosted notebook.`);
     return;
   }
-  chrome.tabs.create({'url': colabUrl});
+  await chrome.tabs.create({'url': colabUrl});
 });