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1. #SCREEN GRABBER FOR GOOGLE CHROME HOW TO#
2. #SCREEN GRABBER FOR GOOGLE CHROME INSTALL#
3. #SCREEN GRABBER FOR GOOGLE CHROME CODE#

#SCREEN GRABBER FOR GOOGLE CHROME HOW TO#

You’ll also find more information there on how to use this new ability with Twilio Video to screen share during a video call.ĭo you have an interesting use case for screen capture in browsers? Drop me your ideas or any questions in the comments below.Capture visible content of a tab, a region of a web page, or the whole page as a PNG image. For a more robust version, check out the screen capture guide in the Twilio docs. We have implemented a very minimal version of the required extension to get access to screen capture.

#SCREEN GRABBER FOR GOOGLE CHROME CODE#

With that knowledge check out how to use the code for both Chrome and Firefox to build a screen sharing video chat application with Twilio Video. If you didn’t write all that code down, you can also check out the results in this GitHub repo.Įverything we have done here is very specific to the Chrome browser, but it turns out you can get access to screen capture in Firefox too. Open up the page, click on the “Get the screen” button and choose the screen, window or tab you want to share. If you have another method you use to serve static files on localhost you can use that too. Get started by creating directory called chrome within your project directory and inside that a new HTML page called index.html. In another post we’ll look into using the stream in a video chat so we can share our screen remotely. We’ll show that in a element on a web page for now. We’ll need that in the next part.įor the rest of this post we’re going to see how to use our new extension to get access to capture our screen. Once it’s uploaded you will want to take a note of your extension ID. From the dialog, navigate to the directory you saved the extension in and select the whole directory.

#SCREEN GRABBER FOR GOOGLE CHROME INSTALL#

Then, to install the extension you need to check the “Developer mode” box and then choose “Load unpacked extension.”. Just open up the extensions settings page by typing chrome://extensions into the address bar of the browser. Installing an extension that you’re working on in Chrome to test is nice and easy. Now we need to install it before we can use it. This is all we need to write for this version of our extension.

In order to let us use the sendResponse function asynchronously we also need to return true at the end of the listener function. Finally, we need to pass a callback that will be called once the function returns a streamId for the stream we asked for access to. We also pass the tab that sent the message to the extension. These can be “screen”, “window”, “tab”, or “audio” and we’ll pass them through from the web page in the message we send. We need to pass an array of sources to capture. Once this event fires, we then need to use to pop up the screen sharing choice. When our listener gets called it receives three arguments, the message we send from our page, a runtime.MessageSender object and a function we can use at most once to send a message back to the page. onMessageExternal is fired when a message is received from outside the extension so we need to listen to it. The extension manifestĬreate a new directory in which to build our application, a directory for the extension itself, and the files manifest.json and extension.js.Ĭntime is the API we use to respond to events external to the extension as well as return other details about the extension itself. It consists of two parts: a manifest.json file that describes the extension and the script we want to run, which we’ll call extension.js. The extension we are going to build is very simple. Let’s write an extension that will give access to screen capture and then show the results of that on the page.

Chrome extensions have extended permissions and APIs that allow access to resources that regular JavaScript on the page cannot. Well, in Chrome we can write a extension which will give us access to the screen, application windows, and browser tabs.

Screen sharing on the web has many security concerns for the end user, so the browsers are handling this feature with concern. There is a draft spec for a getDisplayMedia method but no browser has implemented it yet.