qrcode.js | QR code generator , supports Numeric | QRCode Processing library

The reason why you get an empty string back, even though you can see the src value in your dev tools, is that it takes a very short amount of time to generate the QR-Code.

So var base64 = document.getElementById("qr_neu").src;is called before the QR-Code is generated.

Here is a relevant issues on the qrcode.js repository: https://github.com/davidshimjs/qrcodejs/issues/160.

Here is the solution adapted to your code:

OK so I just need to move the js and min.js file in my static/src/js folder and add the code

Now the workerize method works!

I've originally tried workerize-loader + wasm-loader, and it works pretty well in the dev mode but once it is compiled, the prototype will not be added to the worker (suspecting it's a bug in workerize-loader because all workerized modules behave the same). This indeed turns out to be a bug in workerize-loader (see workerize-loader failed to work after compiling and Version 1.2.0 does not export function on worker instance in production mode). After upgrading to the workerize-loader 1.2.1, it works in both dev and prod code.

I have updated the Master repo: https://github.com/aeroxy/react-typescript-webassembly-starter.git

Please make sure to include the latest Qrcode.js from github link below: https://raw.githubusercontent.com/davidshimjs/qrcodejs/master/qrcode.min.js

Problem in your method was you where passing message.value , while message is not an object or selector it is normal variable string.

You can use Bootstrap Modal here. Just put

Here is how to use Bootstrap Modal - Bootstrap Modal

Try adding $('#qrcode').html(''); as the first item in the .click(function(){}

Like this:

Your logo does not appear because you export the data URL before the final canvas is created. Adding a logo to the QR code is an async process. Setting src of the image after the final canvas is created should fix the problem.

For example, using setTimeout (though it is not a good practice and I don't know if this library provides you with some callbacks).

However, since the logo is from the internet and not your domain, you may face a Tainted canvases may not be exported problem.

You can also read this. Tainted canvases may not be exported

Found a way to do this by inspecting the jsbn oldest version. The whole code is wrapped in anonymous function with the following ending:

I don't know c# but I think the error is in