Hoff 737: session timeout continue form

[Rhodine-orleans-lindsay]

What?

• Create session timeout warning for forms. This ticket is for forms that do not use the save and return feature, so the user will either stay on the page or exit the form but if they exit the form, their information will not be saved. - HOFF-737
• This is modelled of off the NHS IHS form (which leverages hof) (see code repo here) and the govuk design system backlog issue for timeout warnings (see code repo here)

  Why?

• To comply with accessibility requirements

  How?

• configure session timeout warning functionality in frontend/themes/gov-uk/client-js/session-timeout-dialog.js
• add frontend/template-partials/partials/session-timeout-warning.html
• amend frontend/template-partials/partials/page.html to include session timeout warning in pages with forms.
• add styling for session timeout warning
• add exit form button to session timeout warning dialog which resets session and goes to the exit page.
• create session timeout warning component to make exit page and session timeout warning dialog content customisable
• add session timeout warning component readme
• amend confirmation page so it doesn't show popup
• sandbox changes

  Testing?

• added tests for session timeout warning component and sessionDialog functions
• tests passing locally
• beta version tested in services locally and on branch

Anything Else? (optional)

• amended pr template name so it will be picked up
• PR for documentation can be found in hof-guide - https://github.com/UKHomeOfficeForms/hof-guide/pull/22/files
• Demo can be tried on the HOF Demo app

Check list

• [ ] I have reviewed my own pull request for linting issues (e.g. adding new lines)
• [ ] I have written tests (if relevant)
• [ ] I have created a JIRA number for my branch
• [ ] I have created a JIRA number for my commit
• [ ] I have followed the chris beams method for my commit https://cbea.ms/git-commit/ here is an example commit
• [ ] Ensure drone builds are green especially tests
• [ ] I will squash the commits before merging

Screenshots (optional)

Default Session timeout warning

Default exit page after user clicks 'Exit this form'

[sulthan-ahmed]

Nice work I haven't yet reviewed the code. I noticed you linked to a 2018 govuk issues link and with some discussion. It would be interesting to get a view point across government about the design with input from UCD after you've approved and merged your work.