![]() ![]() Now it's time to start writing some JavaScript, firstly we are going to select the video element from the page we just created then check if there is a camera available that we can stream from if there is then start streaming to the video element. The autoplay attribute is needed to play our stream nothing will happen without autoplay. The width and height can be set to whatever you like for this example I'm setting them to 640px by 480px. We are going to use the id to select the element with our JavaScript code later on. The first thing we are going to do is very easy, creating the basic HTML all we are going to add for this example is a tag with an id and some other attributes, you can add more elements to make the layout more interesting we will be doing that in part 2 of this article. (Screenshot was taken May 2021) Let's Start Coding! Creating the basic HTML layout This information could change in the future check the MDN documentation and make sure this info is still up to date. This will run if it is not supported, here is a browser compatibility table to see supported browsers. To check if the browser supports this we can check compatibility with a simple if statement. (Screenshot was taken May 2021) Checking if the browser is compatibleĪs of now, the barcode detection API isn't supported by Firefox, Safari and by no surprise Internet Explorer, being that there are two big and very commonly used browsers that do not support this feature it would be best to first check if the users' browser supports it. This information could change in the future with more codes being added make sure to check the MDN documentation and make sure this info is still up to date. ![]() You also have the choice to make your scanner scan an array of different codes. Supported codes offered by the barcode detection APIĪs of now in 2021, there are thirteen codes that you can choose to detect so you can choose any number of these codes for your scanner to scan. These are some parts of the documentation that I believe could be helpful to know about before starting you can skip to the “Let's Start Coding” section of the article and come back to this later if you just want to start writing some code. This section of the article is just some things that could be useful to know about the API all this information can be found on the MDN documentation. Link to Part 2 (In Development) A Bit More about the Barcode Detection API This series will start quite basic and become more difficult towards the end having a good knowledge of JavaScript can help with understanding some parts of these articles as proxies and web components can be hard to wrap your head around at first.Īll the code is on my GitHub you may want to reference it for CSS if you want to make a carbon copy of this project I will be going over some of the CSS that makes the outlines around the barcodes possible but that's about it for CSS as this is more focused on the JavaScript than the styling of the page. In this part of the article, we will be creating the scanning functionality and learning how to access the camera to detect barcodes & QR codes in realtime in the next part of this article we will be learning how to create the outline around the code we are detecting/scanning and creating a previously scanned section that uses custom web components and proxies. We will be using the Barcode Detection API in JavaScript to make this possible if you have a quick look through the MDN documentation you'll see you are not just restricted to scanning QR codes. See what we are making How is it going to work? You can implement this into any framework you prefer using such as React, Vue, Angular and more. In this article, I'm going to show you how to create a Real-time QR code scanner with JavaScript using no libraries, frameworks, packages or node.js just plain vanilla JavaScript that runs on the browser. That is the scanner is active and is attached to the DOM.Using JavaScripts Built-In Barcode Detection API Returns true if scanner is actively scanning. Returns false if scanner was stopped, true otherwise. Smaller sizes, like 300px can be set to increase performance on The limit is applied to both width and height. Sets the maximum size of images captured from the webcam. setSnapImageMaxSize( snapImageMaxSizeInPixels ) The interval is returned in milliseconds. Returns the interval at which the scanner attempts to decode a qr code. Sets the interval at which the scanner attempts to decode a qr code. setScanInterval( scanIntervalMilliseconds ) Removes the scanner from the given htmlElementĭoes nothing If the scanner is not a child of htmlElement Scanner APIĪppends the scanner to the given htmlElement ![]()
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