Stimulus converts the JS value name templateNonZero to a kebab-cased
attribute by splitting on each capital letter, giving
data-...-template-non-zero-value. Rails' dataset helper converts the
Ruby key :goal_contribution_preview_template_nonzero_value to
data-...-template-nonzero-value (no hyphen between non and zero).
Result: the Stimulus controller resolved templateNonzeroValue to ""
and the preview pane went blank as soon as the user typed an amount.
Renaming the JS value to templateNonzero closes the conversion gap.
Verified live via Playwright: at $500 the preview reads "Will bring
you to 28% saved ($13,750 of $50,000)."; at $40,000 it flips to
"Will reach your $50,000 target."
Add-contribution modal previously offered zero feedback on what the
typed amount would do to goal progress. Now renders "Currently X%
saved (Y of Z)." at rest and updates on each keystroke to
"Will bring you to X% saved (Y of Z)." or "Will reach your Z target."
when the contribution would close the gap.
- New goal_contribution_preview_controller.js consumes current balance
+ target + currency + three localized template strings as Stimulus
values. Intl.NumberFormat for currency formatting (locale-correct
out of the box; fallback to currencyValue prefix on environments
that don't support it).
- ERB form-level data-controller wires the values; amount input uses
amount_data: to thread the Stimulus target / action through the
money_field helper.
- Locale: goal_contributions.new.preview_{zero,nonzero,reached} with
{percent}, {current}, {newTotal}, {target} placeholders.
