React-jsonschema-form: [MS IE 11] Object doesn't support property or method 'assign'

[vasili4]

Description

[MS IE 11] Object doesn't support property or method 'assign'

Steps to Reproduce

1. Open any MS Internet Explorer (I used IE 11)
2. Open playground https://mozilla-services.github.io/react-jsonschema-form/
   

   Expected behavior

Form is shown

Actual behavior

SCRIPT438: Object doesn't support property or method 'assign'

Version

branch gh-pages

[vasili4]

possible solution https://www.npmjs.com/package/object-assign

[n1k0]

The build files ensure a polyfill for Object.assign is bundled through babel. If you're producing your own custom builds, it's up to you to install the right polyfills targeting the right platforms in your project.

[n1k0]

Wait. You say _branch gh-pages_, that means the playground doesn't work on IE 11? I'm reopening.

[n1k0]

I'm really surprised as the bundle.js file clearly shows a polyfill being defined in the source.

Can you confirm this is happening with the playground hosted at http://mozilla-services.github.io/react-jsonschema-form/? (hint: I don't have a Windows machine at hand)

[n1k0]

We could also load polyfill.io polyfills by default in the playground.

[vasili4]

https://developer.microsoft.com/en-us/microsoft-edge/tools/screenshots/#https://mozilla-services.github.io/react-jsonschema-form/

Confirm, it's for github playground only

[vasili4]

Looks like some cases were not transformed

[NaomiN]

I got the same issue as well as problems with find and findIndex methods for arrays. What should be my code in IE instead?

[n1k0]

As mentioned in https://github.com/mozilla-services/react-jsonschema-form/issues/206#issuecomment-220165629 you could load specific polyfills for IE. Didn't that work for you?

[NaomiN]

I am not sure how should I do that and will it work for other people? In the meantime I already implemented workaround.

[n1k0]

Just add <script src="//cdn.polyfill.io/v2/polyfill.min.js"></script> to your html document.

[sbinder]

n1k0,

Adding the CDN polyfill above causes:

SCRIPT5022:  Exception thrown and not caught
polyfills.bundle.js (830,34)

[n1k0]

Does this happen on https://mozilla-services.github.io/react-jsonschema-form/ as well?

[maryrios1]

try this https://github.com/aspnet/JavaScriptServices/wiki/Supporting-Internet-Explorer-11-(or-older)