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feat: Dropdown multi-select with filter chips, filterable support, Select All, and standalone MultiSelect component#3750

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feat: Dropdown multi-select with filter chips, filterable support, Select All, and standalone MultiSelect component#3750
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copilot/add-dropdown-multi-select

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Copilot AI commented Apr 1, 2026

Before (the change)

  • Dropdown multiselect mode had a small checkmark icon in selected items
  • No standalone multi-select component existed; multiselect was only available as a prop on goa-dropdown

After (the change)

  • Checkmark icon size increased (background-size: 0.625rem0.875rem) in multiselect dropdown items to match the standalone checkbox component
  • Dropdown multiselect mode: selected values always render as removable filter chips below the input; filterable + multiselect supported simultaneously; "Select All" at top of list (hidden while filtering); native + multiselect unsupported state prevented; Angular array value round-tripping fixed via JSON.stringify
  • New standalone goa-multi-select / GoabMultiSelect component added as a second option for developers — same multiselect behaviour (filter chips, Select All, filterable mode) but as a dedicated component using goa-multi-select-option / GoabMultiSelectItem child elements
  • React and Angular wrappers provided for the new component and exported from their respective index files
  • Playground at /features/3596 updated with an "Option B" section demonstrating the new standalone component

Make sure that you've checked the boxes below before you submit the PR

  • I have read and followed the setup steps
  • I have created necessary unit tests
  • I have tested the functionality in both React and Angular.

Steps needed to test

  1. Run the React playground: npm run serve:prs:react
  2. Navigate to /features/3596
  3. Option A (Dropdown multiselect): Verify Tests 1–4 — pre-selected chips, chip removal, Select All toggle, and filterable multiselect
  4. Option B (Standalone MultiSelect): Verify MultiSelect Tests 1–3 — basic chip selection, pre-selected values, and filterable mode using GoabMultiSelect + GoabMultiSelectItem

Copilot AI linked an issue Apr 1, 2026 that may be closed by this pull request
…boxes

- Remove @internal from multiselect prop and expose it publicly
- Add _selectedValues reactive property for tracking active multi-selections
- Add _inputCursor computed property for cleaner cursor style logic
- Fix onSelect() to toggle items in multiselect mode and keep menu open
- Fix setDisplayedValue() to show label (1 item) or "N selected" (2+ items)
- Fix reset() to clear all values and dispatch values: [] in multiselect mode
- Update clear button to appear when _selectedValues.length > 0
- Update keyboard handlers (Enter) to keep menu open in multiselect mode
- Add checkbox visual indicator (dropdown-item-checkbox span) per list item
- Set aria-multiselectable on the listbox ul in multiselect mode
- Fix aria-selected and class:selected to use _selectedValues for multiselect
- Use --goa-checkbox-* design tokens for checkbox indicator styling
- Update Angular _onChange to emit values[] via fcChange in multiselect mode
- Add multiselect to DropdownWrapper.test.svelte and 6 new tests
- Add feat3596.tsx playground page with 3 test cases
- Wire playground into main.tsx and app.tsx nav

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Copilot AI changed the title [WIP] Add dropdown multi-select component with combo box functionality feat: Dropdown multi-select Apr 1, 2026
Copilot AI requested a review from bdfranck April 1, 2026 21:27
Selected items in multiselect mode now have no fill; the checkbox
alone indicates selection. Hover/highlight still shows the standard
hover token, keeping the interactive feel without obscuring the checkbox.

Closes #3596

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… dropdown

Adds a `showchips` prop (default false). When enabled on a multiselect
dropdown, a row of removable `goa-filter-chip` elements is rendered
below the input — one per selected value. Clicking the close icon on a
chip deselects that value and dispatches a `_change` event with the
updated `values` array.

- Svelte: new `showchips` prop + `onChipRemove` function + template + CSS
- React wrapper: `showChips` boolean prop
- Angular wrapper: `showChips` @input
- Unit tests: render/hide/deselect via chip removal

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bdfranck commented Apr 1, 2026

@copilot I looked at the latest changes on the playgrond page, feat3596.tsx. I don't see the selected items as filter chips. Any idea why?

image

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Copilot AI commented Apr 1, 2026

@copilot I looked at the latest changes on the playgrond page, feat3596.tsx. I don't see the selected items as filter chips. Any idea why?

<img width="295" height="164" alt="image" src="https://g...

The playground page wasn't using the showChips prop — it was just rendering selected values as plain text. Updated the page (commit 26680ae) to use showChips={true} on the dropdowns. Test 1 now pre-selects Apple/Banana/Cherry so the chip row is visible on load, and Test 2 starts empty to let you verify chips appear as you select items. Expected result matches the design reference — one removable chip per selected value below the input.

Copilot AI changed the title feat: Dropdown multi-select feat: Dropdown multi-select with filter chips Apr 1, 2026
@bdfranck bdfranck requested a review from Copilot April 1, 2026 22:47
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Pull request overview

This PR adds optional “selected value chips” to the multiselect variant of the Dropdown component across the web component, React wrapper, and Angular wrapper, plus a React playground route to demo the behavior.

Changes:

  • Expose multiselect behavior on the web component and add a showchips/showChips option to render removable goa-filter-chip elements for selected values.
  • Update change-event handling and add unit tests for multiselect selection, clear-all behavior, and chip rendering/removal.
  • Wire the new prop through React/Angular wrappers and add a playground feature route (/features/3596) demonstrating the feature.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file
File Description
libs/web-components/src/components/dropdown/DropdownWrapper.test.svelte Test wrapper updated to pass through multiselect and showchips and to handle _change details containing either value or values.
libs/web-components/src/components/dropdown/Dropdown.svelte Implements multiselect selection toggling, optional chip rendering/removal, and associated UI/ARIA updates.
libs/web-components/src/components/dropdown/Dropdown.spec.ts Adds multiselect + chips unit tests (ARIA, selection toggling, event details, clear-all, chip behaviors).
libs/react-components/src/lib/dropdown/dropdown.tsx Adds showChips prop and forwards it to the web component as showchips.
libs/angular-components/src/lib/components/dropdown/dropdown.ts Adds showChips input/attribute forwarding and updates _change handling for multiselect values.
apps/prs/react/src/routes/features/feat3596.tsx New playground page demonstrating multiselect with and without showChips.
apps/prs/react/src/main.tsx Registers the new /features/3596 route.
apps/prs/react/src/app/app.tsx Adds a side menu entry to navigate to the new feature route.

}

// Sync input display value when multiselect selections change externally
$: if (_multiselect && _inputEl) {
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The reactive statement meant to keep the displayed input value in sync for multiselect doesn’t actually re-run when selections change, because it only depends on _multiselect and _inputEl (not value, _values, or _selectedValues). As a result, programmatic/external updates to value after mount can leave the input summary stale. Make this reactive statement depend on _values/_selectedValues (or value) so setDisplayedValue() runs whenever the multiselect selection changes.

Suggested change
$: if (_multiselect && _inputEl) {
$: if (_multiselect && _inputEl && _selectedValues) {

Copilot uses AI. Check for mistakes.
Comment on lines +624 to +632
function onChipRemove(chipValue: string) {
const newValues = _selectedValues.filter((v) => v !== chipValue);
_isDirty = true;
value = newValues.length > 0 ? JSON.stringify(newValues) : "";
dispatch(_rootEl, "_change", { name, values: newValues }, { bubbles: true });
_isDirty = false;
syncFilteredOptions();
setDisplayedValue();
}
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onChipRemove updates selection and dispatches _change even when the dropdown is disabled. Since disabled controls should not allow user-initiated value changes, guard this handler with _disabled (and/or render chips in a non-interactive state when disabled).

Copilot uses AI. Check for mistakes.
Comment on lines 127 to +135
$: _disabled = toBoolean(disabled);
$: _multiselect = toBoolean(multiselect);
$: _native = toBoolean(native);
$: _filterable = toBoolean(filterable) && !_native;

// Tracks the filtered (non-empty) selected values for multiselect mode
$: _selectedValues = _multiselect ? _values.filter((v) => v !== "") : [];
$: _showChips = _multiselect && toBoolean(showchips);

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filterable remains enabled in multiselect mode (_filterable doesn’t account for _multiselect), but the input is forced readonly when _multiselect is true. This combination can break filtering logic (e.g., _inputEl.value becomes "N selected" and syncFilteredOptions() will filter against that). Either explicitly disable filtering when multiselect is enabled (set _filterable false / ignore filterable), or allow typing/filtering in multiselect by removing the readonly restriction and adjusting display behavior.

Copilot uses AI. Check for mistakes.
Comment on lines 127 to 131
$: _disabled = toBoolean(disabled);
$: _multiselect = toBoolean(multiselect);
$: _native = toBoolean(native);
$: _filterable = toBoolean(filterable) && !_native;

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native + multiselect currently produces an unsupported/broken state (native template renders a single-select <select> and selection logic assumes a single value), but _multiselect is still allowed when _native is true. Consider preventing this combination (e.g., _multiselect = toBoolean(multiselect) && !_native and/or log a clear warning) or implementing true native multiselect support.

Copilot uses AI. Check for mistakes.
Comment on lines 108 to +121
_onChange(e: Event) {
const detail = { ...(e as CustomEvent<GoabDropdownOnChangeDetail>).detail, event: e };
// Keep local value in sync with emitted detail
this.value = detail.value || null;
this.onChange.emit(detail);

this.markAsTouched();
this.fcChange?.(detail.value || "");
if (this.multiselect && detail.values !== undefined) {
// Keep local value in sync for multiselect
this.value = detail.values;
this.fcChange?.(detail.values);
} else {
// Keep local value in sync with emitted detail
this.value = detail.value || null;
this.fcChange?.(detail.value || "");
}
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In multiselect mode, _onChange assigns this.value = detail.values (an array). The template binds [value]="value" to the web component, but the web component expects a string (JSON) and will mis-parse an array (it ends up as a single value like "red,blue"). This will also break Angular forms round-tripping. Keep value as the JSON string for the web component (or bind a stringified value), and override writeValue/convertValueToString so string[] values are JSON.stringify’d when sent to the web component.

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Fixed in commit efecefd. The Angular _onChange now stores JSON.stringify(detail.values) for this.value (so [value]="value" passes a JSON string to the web component), while fcChange?.(detail.values) still passes the raw array to Angular forms. Added convertValueToString and writeValue overrides to handle array values written back by Angular forms (e.g., setValue(['red', 'blue'])). The showChips prop has been removed — chips always show in multiselect mode.

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bdfranck commented Apr 2, 2026

@copilot apply changes based on the comments in this thread

Also, remove the option to show the selected items in text. Let's only show them as filter chips.

Copilot AI and others added 2 commits April 2, 2026 15:02
…ct, fix Angular array value handling

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…d writeValue logic

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Copilot AI commented Apr 2, 2026

@copilot apply changes based on the comments in this thread

Also, remove the option to show the selected items in ...

Done in commit efecefd (and follow-up cleanup in 359b95f). Changes applied:

  • showChips prop removed — chips always show in multiselect mode; no opt-in needed.
  • Reactive dependency fixed_selectedValues is explicitly referenced in the reactive block so the input summary stays in sync with external value changes.
  • onChipRemove disabled guard — chips no longer dispatch changes when the dropdown is disabled.
  • filterable disabled in multiselect — prevents filter logic from conflicting with the readonly multiselect input (_filterable = toBoolean(filterable) && !_native && !_multiselect).
  • native + multiselect unsupported state prevented_multiselect = toBoolean(multiselect) && !_native.
  • Angular array value handling fixed_onChange stores JSON.stringify(detail.values) for the DOM property binding while passing the raw array to fcChange for Angular forms. Added convertValueToString and writeValue overrides to handle string[] values from Angular forms round-trips.
  • Playground updatedshowChips prop removed from all dropdowns; text-based selected display removed.

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bdfranck commented Apr 2, 2026

@copilot Does this work with the filterable property? Can I filter a list of options? If so, add it to the examples to demo. If not, add the functionality.

Copilot AI and others added 2 commits April 2, 2026 21:11
…all-options assertions

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Copilot AI commented Apr 2, 2026

@copilot Does this work with the filterable property? Can I filter a list of options? If so, add it to the examples to demo. If not, add the functionality.

Filterable multiselect now works — added in commit e5683bb. When both multiselect and filterable are set, the input is writable so the user can type to narrow the list. After each selection the input clears (so you can search for the next item), and the chips below show what's selected. Added Test 4 to the playground at /features/3596 to demo this combination.

Copilot AI changed the title feat: Dropdown multi-select with filter chips feat: Dropdown multi-select with filter chips and filterable support Apr 2, 2026
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bdfranck commented Apr 2, 2026

@copilot Add a "Select All" to the top of the multi-select filter list.

  • Checking it selects all items
  • Unchecking it deselects all items
  • Hide it when the list is being filtered
  • Check it when all items are selected
  • Uncheck it when not all items are selected

Copilot AI and others added 2 commits April 2, 2026 21:34
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Copilot AI commented Apr 2, 2026

@copilot Add a "Select All" to the top of the multi-select filter list.

  • Checking it selects all items
    ...

Done in commit 9697f92. A "Select All" item now appears at the top of every multiselect menu:

  • Clicking it when no/partial items are selected → selects all and dispatches _change with all values
  • Clicking it when all items are selected → deselects all and dispatches _change with []
  • Checkbox appears checked (aria-selected="true") when all options are selected
  • Hidden while the user is typing to filter (filterable multiselect mode)

Four new unit tests cover all these behaviors, and the playground Test 1 & 2 descriptions have been updated to mention Select All.

Copilot AI changed the title feat: Dropdown multi-select with filter chips and filterable support feat: Dropdown multi-select with filter chips, filterable support, and Select All Apr 2, 2026
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bdfranck commented Apr 2, 2026

@copilot Can we use the goa-checkbox in the multi select list? libs/web-components/src/components/checkbox/Checkbox.svelte If so, implement it. If not, give me a reason why it's best to stay with list items.

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Copilot AI commented Apr 2, 2026

@copilot Can we use the goa-checkbox in the multi select list? libs/web-components/src/components/checkbox/Checkbox.svelte If so, implement it. If not, give me a reason why it's best to stay with ...

It's technically possible but not recommended. Here are the three blocking reasons:

  1. Event collision: goa-checkbox dispatches a _change event with { name, checked, value } using composed: true + bubbles: true, which crosses shadow DOM boundaries. This would bubble up to the same element where the dropdown dispatches its own _change event with { name, values: string[] }. Consumers listening to dropdown _change would see checkbox events leaking out unless we aggressively stop propagation everywhere — fragile and error-prone.

  2. Focus management conflict: goa-checkbox.onChange() calls _checkboxRef.focus() on every toggle to move focus back to the checkbox. The dropdown needs focus to stay on _inputEl to keep the menu open and handle keyboard navigation. With goa-checkbox inside <li>, every selection would fight over focus, likely causing the menu to collapse or filter input to lose its cursor.

  3. Visual output is identical: The current .dropdown-item-checkbox CSS uses the exact same design tokens as goa-checkbox--goa-checkbox-size, --goa-checkbox-border, --goa-checkbox-border-radius, --goa-checkbox-color-bg, --goa-checkbox-color-bg-checked. The rendered output is pixel-for-pixel identical, so there's no visual benefit to switching.

Staying with the current lightweight <span class="dropdown-item-checkbox"> approach avoids all three issues while producing the same visual result.

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bdfranck commented Apr 2, 2026

@copilot Let's add a second version to this PR: a completely new component for multi-select. Make a new Svelte component that has the same multi-select behaviour as the multiselect variation of the dropdown that we created. I want to show it to the developers as a second option.

Copilot AI and others added 2 commits April 2, 2026 22:34
…h React and Angular wrappers

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Copilot AI commented Apr 2, 2026

@copilot Let's add a second version to this PR: a completely new component for multi-select. Make a new Svelte component that has the same multi-select behaviour as the multiselect variation of the ...

Done in commit 17c3f3d (cleanup in bed8ec8). Added a standalone goa-multi-select component as Option B:

New files:

  • libs/web-components/src/components/multi-select/MultiSelect.svelte<goa-multi-select> custom element
  • libs/web-components/src/components/multi-select/MultiSelectOption.svelte<goa-multi-select-option> child element
  • React wrappers: GoabMultiSelect + GoabMultiSelectItem
  • Angular wrappers: GoabMultiSelect + GoabMultiSelectItem

The new component has all the same multiselect behaviour as the dropdown variant:

  • Filter chips for selected values
  • "Select All" at the top (hidden while filtering)
  • Filterable mode (type to narrow the list)
  • Disabled/error states, compact size, margin props

The playground at /features/3596 now has an Option B section with three test cases: basic selection, pre-selected values, and filterable mode.

Copilot AI changed the title feat: Dropdown multi-select with filter chips, filterable support, and Select All feat: Dropdown multi-select with filter chips, filterable support, Select All, and standalone MultiSelect component Apr 2, 2026
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Dropdown: multi-select

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