Adding ShadowDom support.

[travist]

Description

This change allows for this library to work within a Shadow Dom
If you have this library embedded within a shadow dom, it will not work
Fixes:

• Possible fix for Shadow DOM retargeting #819
• Shadow dom event target issues #805

Screenshots (if appropriate)

Types of changes

This adds a new configuration where you can pass the shadowRoot as a configuration. If you this configuration, then this will work in a shadow dom like so.

var shadowRoot = document.getElementById('wrapper').attachShadow({ mode: 'open' });
var choices = new Choices({
  shadowRoot: shadowRoot
});

• Chore (tooling change or documentation change)
• Refactor (non-breaking change which maintains existing functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[no-creative-name]

What's the status of this PR @travist?

[kozi]

Is there a chance that this request will be merged or what still needs to be done?

[karansantani]

I'm running into a similar issue. Trying to isolate the styles for the component using formio selector using Shadow Dom. Choices.js does not seem to work.
@travist Do you have any idea if this PR will be merged in the near future?

[DeekshithRajBasa]

Hello, @travist. I saw that the current version of Formio has modifications to the choice js within it; how do I make this work with Angular shadow DOM?
I'm stuck since I don't know how to make it work with Angular using the code you gave in the readme file.

var shadowRoot = document.getElementById('wrapper').attachShadow({ mode: 'open' });
var choices = new Choices({
  shadowRoot: shadowRoot
});

Thanks in advance.

[mariolinguito]

My workaround can be helpful for someone: #805

[verena-ifx]

is there any update on this?