Html open camera scan qr code
The barcode and QR code have modernized our shopping and searching experience. Customers carrying smartphones can now pick up a product anywhere in the world, scan its barcode or its QR code using one of the many free phone apps and find out its lowest price as well as where it can be bought. Show
Companies like Walmart and Amazon have embraced this technique to draw customers to their online and offline stores using their phone app. Other companies like Fedex and UPS allow customers to scan the codes on packages using a phone app, instead of needing to manually type in long lists of characters. If the users of your mobile website have a need to type in long codes like activation codes, or they like to look up specific products on your website based on a model number printed in a magazine or advertisement, then you too can take advantage of QR codes to eliminate the frustration of tiny keyboards and spare them the need to double check for errors. QR Code Scanning with Your Mobile WebsiteYou don’t need a native phone app to scan QR codes. It’s quite simple to create your own QR code reader. Your website running on a smartphone equipped with a camera and running a little JavaScript can do the same trick. Here’s a demo of a QR code scanner that works not only on Mobile but also in most modern devices. All you need is a camera and a QR code to scan. If you don’t have a QR code handy, here’s one that shows the first eight digits of Pi. Creating the QR Code ReaderOur QR code reader will need some HTML and JavaScript but most importantly, a JavaScript library capable of interpreting the QR code. We’re not going to build that ourselves, because there are some great libraries out there doing this for us, so we don’t need to reinvent the wheel for our current purposes. Let’s begin by creating an Adding the HTMLWe’ll need some very simple HTML for this project. Add the following to your body tag:
As you can see, we have a wrapper container with a title, the QR icon image wrapped in an Outside the
container Adding StylesAdd the stylesheet to the head of our HTML:
Now we want to create the
Nothing fancy at all. We’ll leave everything centered with a big QR button in the middle and the result underneath. We’re using black and white like the QR codes. Including the Dependent JavaScript LibrariesThe secret to reading QR codes is math, and the substitute for math is open-source libraries. To read QR codes, we’ll be using the JavaScript port of the Java-based image processing library written by ZXing. The JavaScript version was ported by Lazar Laszlo. Because the JavaScript library consists of 17 files, we’ve taken the liberty of merging them into one file, wrapping the code in an anonymous function to prevent pollution of the global namespace and putting the file through Google Closure’s minifier to make the file size smaller. Some Minor Tweaks to the LibraryIn order to make the library more adaptable, we’ve added a few minor changes to the library’s output function to differentiate between a success response and an error response. Two important changes made were in qrcode.js, to these two lines:
These strings have been replaced by
Now I can detect in my callback function whether an error occurred, just by checking if the callback payload is an instance of
Those changes can be found in this fork of the library. Adding the Script TagTo use the library in our QR code reader, we first need to include it in our HTML using a regular script tag:
Treating It as an AppSomething we’ll need to do is tell mobile browsers that we don’t want to scale this site in
portrait mode. This can be achieved by adding the following meta tag within the
Adding the JavScriptNow we need to create the Let’s add some code to our new file:
At the top of this bit of code we get the Then we get the Then we get the relevant elements to show the results and interact with the app and, at the bottom, we declare the Next we’ll set the callback for our QR code reader. Add the following at the bottom of the file:
Here
we’re assigning the There are four other things going on here. First, we’re setting the Then, we’re getting all tracks from the stream
inside the Right after that, we’re making sure we display the This is all we need to handle the scanner response. Now we need to access the camera feed and set up a loop to draw the images in our canvas every frame. We also need another loop to scan for QR codes every x milliseconds. Scanning every frame would be a waste of resources, so we’re better off handling that in a separate loop where we can control the frequency in which we run the algorithm. We’ll do this in the
OK, let’s go through this. We’re calling the
getUserMedia function from the The At this point, we can Let’s define the
This is a classic frame-by-frame loop. We’re setting the hight and width of the Now let’s define the scan function:
Now, this is quite simple. We run the That’s all we need! Now let’s try the app. See the QR Code Reader in ActionHere’s the working project in codesandbox. Click on the QR button and show the camera some QR code to scan. Hold it in place for an instant and you’ll get your result. You’ll be surprised at how fast and smooth it is. ConclusionSo there we have it, your very own QR code reader for your mobile website. You can also use this from any platform, which makes it super dynamic and brings a lot of value to your customers. QR codes have been around for many years, and the image processing code written by ZXing was first ported to JavaScript almost nine years ago. It has stood the test of time so well that it still remains one of the fastest — if not the fastest — option out there for the Web. It’s also free an open source, which makes it even better. We hope you have fun coming up with something amazing! Downloadable Assets
External Links
How do I scan a QR code in HTML?QR Code scanner using HTML5 and Javascript. Clone the project and include the libraries.. Add a palceholder element in HTML.. Enumerate all available cameras. Sample code:. Once you have cameraId you can perform start/stop operations. Sample code: For stopping an ongoing scanning, just call. Sample implementation.. How do I scan a QR code to open a website?To access the URL on your smart device, click on the plugin icon, a QR code for the current page is shown on the screen. 3. Read the QR code with your smartphone and quickly access the URL in your device with minimal effort.
How do you open a QR code on a camera?Scan QR codes on Camera from Google. Open Camera from Google .. Choose an option to scan: To scan with the QR mode of Camera from Google, tap QR , and point your camera at a QR code. ... . To open a browser page, app, or payments app after a QR code is scanned, click the banner that appears.. Can we scan QR code with camera?You can scan QR codes on any Android device that has a camera, whether it's a smartphone or a tablet. And once you've scanned the code, you can open or share its URL (the website it points to) freely.
|