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Canvas#toDataURL() returns image data url string with quotes included

See original GitHub issue

Canvas#toDataURL() returns a string like "\"data:image/png;base64,iVB...\"".

It seems caused by the payload being JSON.stringify() at web view side: https://github.com/iddan/react-native-canvas/blob/master/src/webview.js#L88 and get returned directly at React Native side: https://github.com/iddan/react-native-canvas/blob/master/src/Canvas.js#L76

Issue Analytics

State:
Created 4 years ago
Reactions:5
Comments:8 (1 by maintainers)

Top GitHub Comments

6reactions

fabiancookcommented, Jul 7, 2019

Please can we document this as it isn’t the same signature as what is on the web.

Because of me just ignoring the quotes when I read them in the console, I didn’t notice the extra quotes D: Took me a while to figure out that one.

1reaction

mikepjcommented, Nov 24, 2021

I just ran into this issue after spending a few hours debugging. I worked around it by replacing the quotes in the string returned:

imageData = await canvas.toDataURL();
imageData = imageData.replace(/^"|"$/g, ``);

I’m not sure what the best solution is here. Singling out the toDataURL call when choosing whether to stringify the response message in the code @rocwind linked above doesn’t feel right.