WIP focus setting for modal open and close

[iamjolly]

For @ryanwoldatwork and @iamjolly to pair on.

Relates to #480

Things to do:

• Set focus on modal div when opened
• Set focus back to touchpoints button when modal is closed
• Confirm listener for esc keypress to run the handleDialogClose function.
• Trap focus in modal when opened - see Using JavaScript to trap focus in an element for more info
• Test with keyboard only and with screen reader to confirm everything works as expected.

Note: This is a vanilla JS approach to adding accessibility to the modal. A next effort should involve looking at ways for touchpoints to use the USWDS modal component per #481.

[ryanwoldatwork]

thanks @iamjolly!!

[ryanwoldatwork]

paired today and check a few boxes here

[cannandev]

Hey @iamjolly @ryanwoldatwork I'm working on a project that would implement Touchpoints on childcare.gov. Wanted to check in on the status of this update. Thanks in advance!

[ryanwoldatwork]

hi @cannandev - the path forward is pretty clear. Hoping to knock this out late next week.

[mharvey]

@iamjolly , @ryanwoldatwork : Could you please provide a status update on this? Thanks!