| <html> | |
| <head> | |
| <title>Html-Qrcode Demo</title> | |
| <body> | |
| <div id="qr-reader" style="width:500px"></div> | |
| <div id="qr-reader-results"></div> | |
| </body> | |
| <script src="https://raw.githubusercontent.com/mebjas/html5-qrcode/master/minified/html5-qrcode.min.js"></script> | |
| <script src="html5-qrcode-demo.js"></script> | |
| </head> | |
| </html> |
| function docReady(fn) { | |
| // see if DOM is already available | |
| if (document.readyState === "complete" || document.readyState === "interactive") { | |
| // call on next available tick | |
| setTimeout(fn, 1); | |
| } else { | |
| document.addEventListener("DOMContentLoaded", fn); | |
| } | |
| } | |
| docReady(function() { | |
| var resultContainer = document.getElementById('qr-reader-results'); | |
| var lastResult, countResults = 0; | |
| var html5QrcodeScanner = new Html5QrcodeScanner( | |
| "qr-reader", { fps: 10, qrbox: 250 }); | |
| function onScanSuccess(decodedText, decodedResult) { | |
| if (decodedText !== lastResult) { | |
| ++countResults; | |
| lastResult = decodedText; | |
| console.log(`Scan result = ${decodedText}`, decodedResult); | |
| resultContainer.innerHTML += `<div>[${countResults}] - ${decodedText}</div>`; | |
| // Optional: To close the QR code scannign after the result is found | |
| html5QrcodeScanner.clear(); | |
| } | |
| } | |
| // Optional callback for error, can be ignored. | |
| function onScanError(qrCodeError) { | |
| // This callback would be called in case of qr code scan error or setup error. | |
| // You can avoid this callback completely, as it can be very verbose in nature. | |
| } | |
| html5QrcodeScanner.render(onScanSuccess, onScanError); | |
| }); |
@secure-slikroad there has been a feature request around this - mebjas/html5-qrcode#65
Just today I have sent a PR to add this support - mebjas/html5-qrcode#104
Once its merged (version 1.2.1) once can request the browser to open the front camera or back camera directly.
That said, this support is being added to Html5Qrcode class and not the Html5QrcodeScanner class. I'd recommend adding a comment to mebjas/html5-qrcode#65 on how you desire the user experience to be - based on response from different users I'll try to design a scalable way to handle this in the scanner code as well.
How do I make the scanner to auto redirect the browser after decoding the qr?
@mwambajoshua for now, you can do this
function validURL(str) {
var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
'((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
'(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
'(\\#[-a-z\\d_]*)?$','i'); // fragment locator
return !!pattern.test(str);
}
function onScanSuccess(qrCodeMessage) {
if (validURL(qrCodeMessage)) {
window.location.href = qrCodeMessage;
}
}
var html5QrcodeScanner = new Html5QrcodeScanner(
"qr-reader", { fps: 10, qrbox: 250 });
html5QrcodeScanner.render(onScanSuccess);
I tried on Chrome and Firefox on Windows10, Chrome and Firefox on Ubuntu, Chrome on Android. I guess it is because of server settings, since it is working on localhost also
Hi, same problem," unable to query supported devices" on AWS, How can you solve this?
how do i style this
because I'm using it in one of my clients apps and was wondering how to make (no offence meant hear) not so ugly
@mebjas plz read the above
@Haz-MatPLz - Html5QrcodeScanner is meant to provide a simple UI experience for QR code scanning. If you want to use your own UI, use Html5Qrcode library which provides all the necessary APIs to build so.
I'm glad that I was able to find this sample and opted for the end-to-end scanner. Is there a way to turn off the camera (from scanning to idle again) if it doesn't successfully scan for a certain amount of time?
not working on iOS, permissions denied.
edit: the website needs to be on HTTPS
Does anyone know whether there is any possible solution to change the default width of video from 300px? Though I have set the width of div to 100%, video and canvas width of 300px is being overridden and video is getting cornered to the left. I want to know whether there is any possible way to adjust this width?
@matiazar If I recall correctly this can be achieved when you use the
Html5Qrcodedirectly. In the demo I have consciously added logic for request permission every time - to both show demo and I think user should have control.But at the API level, the permission is needed only once* (...)
Thanks for this great applicaction. I am using this qr reader in a pc with a webcam to read qrcodes, open urls from qr´s, and back again to the qr reader. So I would like to know if is possible to avoid give permissions again and also click in "start scanning" button. In this way, qr reader will be scanning automatically.
Please let me know if this is possible and how i can achieve it. Thanks in advance
Hi, I am trying to use in Blazor with the following code:
Blazor Page:
<div style="width: auto" id="reader"></div>' @code {
protected override async Task OnAfterRenderAsync(bool firstRender)
{
if (firstRender) await _jsRuntime.InvokeVoidAsync("Html5QrCode", DotNetObjectReference.Create(this));
await base.OnAfterRenderAsync(firstRender);
}
}
`
Js:
`function Html5QrCode () {
var html5QrCode = new Html5Qrcode("reader");
Html5Qrcode.getCameras().then(devices => {
if (devices && devices.length) {
var cameraId = devices[1].id;
alert("cameraId: " + cameraId);
html5QrCode.start(
cameraId,
{
fps: 10, // Optional frame per seconds for qr code scanning
qrbox: 250 // Optional if you want bounded box UI
},
qrCodeMessage => {
// do something when code is read
alert(qrCodeMessage);
},
errorMessage => {
// parse error, ignore it.
// alert(errorMessage);
})
.catch(err => {
// Start failed, handle it.
});
}
}).catch(err => {
// handle err
alert(err);
});
};`
I can read the camera id, but then I have the following error:
Cannot set property 'innerHTML' of null
thanks,
João Sousa
when i run code on phone it's show
error :- unable to query supported devices
Please Help Sir
HI,
You code works super good. Anyway I need some help.
When I scanned the QR code, scanner was shutted down and give me a result from the scan.
Can I after this add some button like "Start a new scan" or "Scan another code"? Because now, when I want a new scan, I must reload the whole page..
Thanks,
Dominik
Nice QR code reader.. but...
Does anyone know what permissions you need to add to Android Studio to get this to work within an Android app (as a webview)? I've added the camera and write external permissions.. but within the app it says "NotAllowedError: Permission denied". Though if I load up the url within Chrome it works fine. (The url is https)
Thanks.
In your site demo, in addition to qrcode, I can also scan barcodes. But when I transfer the source code to my project, it only reads qrcode but does not read barcodes
Hi Everyone,
I am facing the issue with Html5Qrcode availability in global scope in my react typescript app. i am following this article (https://simbathesailor.dev/qrcode-scan-web-reactjs/) to implement as Hook in my react-typescript app, could you please help me to fix this issue. how can i declare in .d.ts file.
What exactly you want to say in below comment
// eslint-disable-next-line
const html5qrCodeScanner = new Html5Qrcode(qrcodeMountNodeID);
How can i fix this issue, i am not getting Html5Qrcode in global scope event after following the complete steps ?
Please help
Hi Guys I have a lovely working example setup including some customisations of redirecting the user to a page with variables gathered from the QR code for processing, but I'm still stuck on how to enforce the rear camera...
Posted my general question here but could do with some input
https://stackoverflow.com/questions/67538983/navigator-mediadevices-getusermedia-reverse-camera-list-order-show-only-rear
I think the issue is I am using the simple version and applying my custom js inside resultContainer.innerHTML += and I need to be using the (start) method / PRO method instead, however I cant find any examples of this method?
@mebjas do you have any thoughts
Thanks
This routine is working for my needs and I have my code in there to process the qrCodeMessage and the .clear() does clear it however wipes the widget completely from the body. What's the procedure to stop scanning once you have success and stop the video feed etc as if you hit the stop button on the demo? I want to scan the code, stop video feed etc, process the message then be able to scan a new code. I can't seem to figure out how to start it again after the .clear() without refreshing the page.
function onScanSuccess(qrCodeMessage) {
// handle on success condition with the decoded message
html5QrcodeScanner.clear();
// ^ this will stop the scanner (video feed) and clear the scan area.
}
In your site demo, in addition to qrcode, I can also scan barcodes. But when I transfer the source code to my project, it only reads qrcode but does not read barcodes
Yes i too couldnt scan anything except QR
@Reza-kavian @Jalil-Irfan - Try latest version of the library (v2.0.9), it should read different formats listed in the readme.
Hi mebjas
I found the one problem, I ecoded "1" to QR code, and this what I can't scan, it can't decode. Can you tell me where in the library I can see if I can fix it, thank you!
Hi mebjas,
I am more or less new to web development. I tried your example but I get error:
scan:57 Uncaught ReferenceError: Html5QrcodeScanner is not defined
I have put in Handlebars layout:
<script src="https://unpkg.com/html5-qrcode" type="text/javascript">
and in handlebars view this:
QR Code Scanner
I know it must be some 'basic' problem... Can you help?
hi mebjas, I tried using all ur format, but anytime I display it on browser(localhost) everything is always blank....no camera showing
Good evening. Is there a way to set it on image reader by default instead of scan first?
I seem to have an issue when the qrcode scanner is kept in between the
. When the scanner starts it prompts the permission with REQUEST CAMERA PERMISSIONS button. but since the button is not having any type"button" attribute by default, it is posting the form automatically which is unintended. how can the type="button" be added to prevent it? Thanks
@mwambajoshua for now, you can do this
function validURL(str) { var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string '(\\#[-a-z\\d_]*)?$','i'); // fragment locator return !!pattern.test(str); } function onScanSuccess(qrCodeMessage) { if (validURL(qrCodeMessage)) { window.location.href = qrCodeMessage; } } var html5QrcodeScanner = new Html5QrcodeScanner( "qr-reader", { fps: 10, qrbox: 250 }); html5QrcodeScanner.render(onScanSuccess);
@mebjas how can i add this script only the back camara? html5QrcodeScanner.render({ facingMode: { exact:"environment" } }, onScanSuccess); i cant :(
Hello mebjas, i have try your code and tryin on android phone and iphone, thats working perfecly. Thats great.
When we request permission camera, why always front camera to be the first selection.
Can we make to use "back camera" as the default camera ?