![]() Now you’re thinking, “Oh boy, I really wanna re-watch it when I’m offline. It’s so catchy, you can’t stop watching it. ![]() If you want to take semi-accurate screenshots quickly with no external service dependency, html2canvas could be the right choice for you.įinally, if you're okay with outsourcing the technical implementation and the cost associated with it, a screenshot service might be the best option.Here’s the thing: you found a video online. If you need a pixel-perfect representation of what your user is looking at and don't mind the sometimes obtuse permissions popup, the getDisplayMedia API is a good place to start. Using a client-side solution, like html2canvas or the getDisplayMedia API means you don't have to manage any server infrastructure and generally the images are generated pretty quickly. Whether you're integrating screenshots to get feedback or for a critical feature in your application, you need to weigh up the pros and cons of each solution. Time - screenshot services can take multiple minutes to generate and return an image. Although it's quite cheap, if you're handling large volumes of screenshots, it could be expensive. For example, if the user has interacted with the page, or if they're authenticated, the screenshot service won't be able to render the same page for a screenshot.Ĭost - out of the three options, this is the only one that comes with a cost. Not stateful - the screenshot might not be what the user sees. If you're happy to, projects like PhantomJS and services like SauceLabs are a good place to start. Robust APIs - the services are used by many people and facilitate large volumes of requests.Infrastructure - you don't need to maintain the infrastructure to manage the process of taking a screenshot. Post processing - services can handle post processing too, offering the flexibility to generate images in different file types, sizes, quality and more. That screenshot is then saved to the local filesystem - or you can return it in the request. The above example takes a request like /screenshot?url= and then uses the url2png library to generate a screenshot. Html2canvas(screenshotTarget).then( ( canvas) => ).pipe(fs.createWriteStream( 'screenshot.png')) The example below generates a screenshot and opens it in the window as an image. Under certain restrictions, the canvas element can generate a data URI of the contents inside (as a base64 string). The idea is pretty simple - you capture the DOM (HTML of the page) when you want to generate a screenshot, and you pass that DOM into an HTML canvas. Later investigation revealed Google uses a very similar technique to automatically generate screenshots of users providing feedback, proving the implementation scales, and is robust enough for large products. ![]() #Screen grabber chrome code#After he made the code public, he updated his answer with the original idea that is html2canvas. ![]() Niklas von Hertzen answered a StackOverflow question in 2011 saying it's possible to put the DOM of the page into an HTML canvas and use it to generate a screenshot. Using html2canvas for client-side screenshots Here are three ways you can automatically capture screenshots for your users: 1. ![]() If you're hosting the screenshots yourself, you want to make sure they take up as little space as possible, which in turn ensures you spend as little as possible. #Screen grabber chrome how to#Most users probably won't know how to resize or optimize the quality of the screenshot either. For example, they could upload it to somewhere like Dropbox or email it to you. Then they need to know what to do with it. First, they need to know the keyboard shortcut (which is different from macOS to Windows). Companies like Google use them for getting feedback from users, products like BugHerd use screenshots as a core part of their product and they're great for generating data exports (like charts).Īsking users to take a screenshot of what they're looking at introduces a lot of friction. Screenshots can be a very valuable and important part of your JavaScript application. #Screen grabber chrome download#Let's take a look at three different ways you can take screenshots, and then how you can use them by sending them to a server or letting the user download the image. Taking screenshots in-browser (or 'client-side') is all about tradeoffs - there's no perfect solution for every situation. ![]()
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