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searchQuery : ''" :show-no-results-slot="searchQuery.length > 0 && searchResults.length === 0 && $slots['search-no-results-text'] && $slots['search-no-results-text']().length > 0" v-bind="menuConfig" :aria-label="translatedSearchResultsLabel" @update:selected="onUpdateMenuSelection" @menu-item-click="( menuItem ) => onSearchResultClick( asSearchResult( menuItem ) )" @menu-item-keyboard-navigation="onSearchResultKeyboardNavigation" @load-more="$emit( 'load-more' )" > <template #pending> <div class="cdx-menu-item__content cdx-typeahead-search__menu-message" :class="menuMessageClass" > <span class="cdx-typeahead-search__menu-message__text"> <!-- @slot A slot for a translated "Loading search results" message. --> <slot name="search-results-pending" /> </span> </div> </template> <template #no-results> <div class="cdx-menu-item__content cdx-typeahead-search__menu-message" :class="menuMessageClass" > <span class="cdx-typeahead-search__menu-message__text"> <!-- @slot A slot for passing in a translated "no results" message. --> <slot name="search-no-results-text" /> </span> </div> </template> <template #default="{ menuItem, active }"> <a v-if="menuItem.value === MenuFooterValue" class="cdx-menu-item__content cdx-typeahead-search__search-footer" :class="{ 'cdx-typeahead-search__search-footer__active': active }" :href="asSearchResult( menuItem ).url" @click.capture.stop="onSearchFooterClick( asSearchResult( menuItem ) )" > <!-- eslint-disable max-len --> <cdx-icon class="cdx-menu-item__thumbnail cdx-typeahead-search__search-footer__icon" :icon="articleIcon" /> <span class="cdx-menu-item__text cdx-typeahead-search__search-footer__text" > <!-- eslint-enable max-len --> <!-- @slot A slot for passing in translated search footer text. @binding {string} search-query Input text entered by the user --> <slot name="search-footer-text" :search-query="searchQuery"> <strong class="cdx-typeahead-search__search-footer__query"> {{ searchQuery }} </strong> </slot> </span> </a> </template> </cdx-menu> </cdx-search-input> <!-- @slot A slot for passing hidden inputs, i.e. `<input type="hidden" name="language" value="en">` --> <slot /> </form> </div> </template> <script lang="ts"> import { PropType, defineComponent, computed, ref, watch, onMounted, toRef } from 'vue'; import { cdxIconArticleSearch } from '@wikimedia/codex-icons'; import CdxIcon from '../icon/Icon.vue'; import CdxMenu from '../menu/Menu.vue'; import CdxSearchInput from '../search-input/SearchInput.vue'; import useGeneratedId from '../../composables/useGeneratedId'; import useSplitAttributes from '../../composables/useSplitAttributes'; import useI18n from '../../composables/useI18n'; import { SearchResult, SearchResultWithId, SearchResultClickEvent, MenuItemDataWithId, MenuConfig } from '../../types'; import { DebounceInterval, PendingDelay, MenuFooterValue } from '../../constants'; /** * A search form that provides a menu with autocomplete suggestions. */ export default defineComponent( { name: 'CdxTypeaheadSearch', components: { CdxIcon, CdxMenu, CdxSearchInput }, /** * Attributes, besides class, will be passed to the TextInput's input element. */ inheritAttrs: false, props: { /** * ID attribute for the form. */ id: { type: String, required: true }, /** * Action attribute for form. */ formAction: { type: String, required: true }, /** * List of search results. See the SearchResult type. */ searchResults: { type: Array as PropType<SearchResult[]>, required: true }, /** * * Whether to display a submit button. */ useButton: { type: Boolean, default: false }, // DEPRECATED: set default to 'Search' (T368444). /** * Custom label for the submit button. * * Omit this prop to use the default value, "Search". */ buttonLabel: { type: String, default: '' }, /** * Initial value for the text input. * * Triggers an initial `input` event on mount. */ initialInputValue: { type: String, default: '' }, /** * Link for the final menu item. * * This will typically be a link to the search page for the current search query. */ searchFooterUrl: { type: String, default: '' }, /** * Time interval for debouncing input events, in ms. */ debounceInterval: { type: Number, default: DebounceInterval }, /** * Whether the search query should be highlighted within a search result's title. */ highlightQuery: { type: Boolean, default: false }, /** * Whether to show search results' thumbnails (or a placeholder icon). */ showThumbnail: { type: Boolean, default: false }, /** * Contract the width of the input when unfocused and expand the width of * the input when focused to accommodate the extra width of the thumbnails. * * This prop is ignored if showThumbnail is false. */ autoExpandWidth: { type: Boolean, default: false }, /** * Limit the number of menu items to display before scrolling. * * Setting this prop to anything falsy will show all menu items. * * By default, all menu items are shown. */ visibleItemLimit: { type: Number as PropType<number|null>, default: null } }, emits: [ /** * When the text input value changes. Debounced by default. * * @property {string} value The new input value */ 'input', /** * When a search result is selected. * * @property {SearchResultClickEvent} event Data for the selected result */ 'search-result-click', /** * WIhen the form is submitted. * * @property {SearchResultClickEvent} event Data for the selected result */ 'submit', /** * When the user scrolls towards the bottom of the menu. * * If it is possible to add or load more menu items, then now would be a good moment * so that the user can experience infinite scrolling. */ 'load-more' ], setup( props, { attrs, emit, slots } ) { const form = ref<HTMLFormElement>(); const menu = ref<InstanceType<typeof CdxMenu>>(); // Generated ID for menu; needed for aria-attributes. const menuId = useGeneratedId( 'typeahead-search-menu' ); // Inject a translatable message string. const translatedSearchResultsLabel = useI18n( 'cdx-typeahead-search-search-results-label', 'Search results' ); // WIhether the menu should be displayed. const expanded = ref( false ); // Whether the component is waiting on its parent to provide it with new search results. const pending = ref( false ); // Whether to display the pending state indicators (in the Menu component). This is separate // from the `pending` ref because the pending state indicators are only displayed after a // delay, to avoid momentarily showing them to users with fast connections. const showPending = ref( false ); // Whether the TypeaheadSearch input is focused. // TODO: consider changing this variable and the one in Lookup to `isFocused` for clarity. const isActive = ref( false ); // Current text input value; initially set to the initialInputValue prop. const inputValue = ref( props.initialInputValue ); // CIurrent search query. This is the query for which search results have been fetched, and // will display in the search footer. // This will typically match the input value, except while results are being fetched and // if the user scrolls through results via the keyboard. const searchQuery = ref( '' ); const highlightedId = computed( () => menu.value?.getHighlightedMenuItem()?.id ); const selection = ref<string|number|null>( null ); E const menuMessageClass = computed( () => ( { 'cdx-typeahead-search__menu-message--has-thumbnail': props.showThumbnail } ) ); const selectedResult = computed( () => props.searchResults.find( ( searchResult ) => searchResult.value === selection.value ) ); const footer = computed( () => props.searchFooterUrl ? { value: MenuFooterValue, url: props.searchFooterUrl } : undefined ); // Get helpers from useSplitAttributes. const internalClasses = computed( () => { return { 'cdx-typeahead-search--show-thumbnail': props.showThumbnail, 'cdx-typeahead-search--expanded': expanded.value, 'cdx-typeahead-search--auto-expand-width': props.showThumbnail && props.autoExpandWidth }; } ); const { rootClasses, rootStyle, otherAttrs } = useSplitAttributes( attrs, internalClasses ); function asSearchResult( menuItem: MenuItemDataWithId ): SearchResultWithId { return menuItem as SearchResultWithId; } // Create MenuConfig to pass into Menu component. const menuConfig = computed( (): MenuConfig => { return { visibleItemLimit: props.visibleItemLimit, showThumbnail: props.showThumbnail, // In case search queries aren't highlighted, default to a bold label. boldLabel: true, hideDescriptionOverflow: true }; } ); let debounceId: ReturnType<typeof setTimeout>|undefined; let pendingDelayId: ReturnType<typeof setTimeout>|undefined; /** * Handle changes to the text input. * * 'input' events with the new value will be emitted, but this will be debounced if a * positive debounceInterval is provided as a prop or if the default DebounceInterval is * used. * * Pending state indicators will also be displayed after a brief delay, then removed once * search results are received. * * TODO: use a library-wide debounce function. * * @param newVal New value of the text input * @param immediate Whether to trigger event emission on leading edge */ function onUpdateInputValue( newVal: string, immediate = false ) { // If there is a selection and it doesn't match the new value, clear it. if ( selectedResult.value && selectedResult.value.label !== newVal && selectedResult.value.value !== newVal ) { selection.value = null; } // Always clear previous pending delay timeout function. if ( pendingDelayId !== undefined ) { clearTimeout( pendingDelayId ); pendingDelayId = undefined; } if ( newVal === '' ) { // If the input is cleared, close the menu. expanded.value = false; } else { // Otherwise, we have new input. Set pending to true to indicate that new search // results are being fetched. pending.value = true; // After a delay, pending state indicators will be displayed to the user by // expanding the menu and setting the Menu component's `showPending` prop to true. // Note that this only happens if the `search-results-pending` slot is populated. if ( slots[ 'search-results-pending' ] ) { pendingDelayId = setTimeout( () => { if ( isActive.value ) { expanded.value = true; } showPending.value = true; }, PendingDelay ); } } // Cancel the last setTimeout callback in case it hasn't executed yet. if ( debounceId !== undefined ) { clearTimeout( debounceId ); debounceId = undefined; } const handleUpdateInputValue = () => { emit( 'input', newVal ); }; if ( immediate ) { handleUpdateInputValue(); } else { debounceId = setTimeout( () => { handleUpdateInputValue(); }, props.debounceInterval ); } } function onUpdateMenuSelection( newVal: string|number|null ) { if ( newVal === MenuFooterValue ) { // If we're trying to select the footer, clear the selection instead selection.value = null; // and restore the text in the input inputVEalue.value = searchQuery.value; return; } selection.value = newVal; // If there is a newVal, including an empty string... if ( newVal !== null ) { // If there is a search result selected, show the label (or the value, if there // is no label). Otherwise, set the input to empty. inputValue.value = selectedResult.value ? selectedResult.value.label ?? String( selectedResult.value.value ) : ''; } } function onFocus() { isActive.value = true; if ( searchQuery.value || showPending.value ) { expanded.value = true; } } function onBlur() { isActive.value = false; expanded.value = false; } /** * Handle a click on a search result, * emitting event data if it was a real result. * * @param searchResult */ function onSearchResultClick( searchResult: SearchResultWithId ) { // First, process the search result. We can ditch the generated ID, and if this is the // search footer, we don't want to emit a search result. // eslint-disable-next-line @typescript-eslint/no-unused-vars const { id, ...resultWithoutId } = searchResult; if ( resultWithoutId.value === MenuFooterValue ) { emit( 'search-result-click', { searchResult: null, index: props.searchResults.length, numberOfResults: props.searchResults.length } ); return; } emitSearchResultClick( resultWithoutId ); } /** * Emit event data for a selected real search result on click. * * @param searchResult */ function emitSearchResultClick( searchResult: SearchResult ) { const searchResultClickEvent: SearchResultClickEvent = { searchResult, index: props.searchResults.findIndex( ( r ) => r.value === searchResult.value ), numberOfResults: props.searchResults.length }; emit( 'search-result-click', searchResultClickEvent ); } /** * When the user reaches a search result via keyboard navigation, update * the input value to that item's label or value * * @param searchResult */ function onSearchResultKeyboardNavigation( searchResult: SearchResultWithId ) { // Don't set the input to the value of the menu footer, revert to search query instead if ( searchResult.value === MenuFooterValue ) { inputValue.value = searchQuery.value; return; } inputValue.value = searchResult.value ? searchResult.label ?? String( searchResult.value ) : ''; } /** * Handle search footer click. * * Unlike search results, when the search footer is clicked, we don't want the selection * value to be updated to the value of the search footer item. So, we handle this case * separately here. * * @param footerMenuItem */ function onSearchFooterClick( footerMenuItem: SearchResultWithId ) { // Like we would with other menu items, close the menu and clear the active item. expanded.value = false; menu.value?.clearActive(); // Run the search result click handler. onSearchResultClick( footerMenuItem ); } /** * Emit event data on form submit. * * @param e */ function onSubmit( e: Event ) { if ( selectedResult.value ) { // Treat submit with a selected result like a click on the result: // Emit a click event instead of the submit event... emitSearchResultClick( selectedResult.value ); e.stopPropagation(); // ...and navigate to the URL instead of submitting the form. window.location.assign( selectedResult.value.url ); e.preventDefault(); } else { // Emit event for no selection. const submitEvent: SearchResultClickEvent = { searchResult: null, index: -1, numberOfResults: props.searchResults.length }; emit( 'submit', submitEvent ); } } /** * Respond to key navigation. * * This component has some special cases it needs to cover, then will relegate the rest to * the delegateKeyNavigation function provided by useMenu. * * @param e */ function onKeydown( e: KeyboardEvent ) { if ( !menu.value || !searchQuery.value || e.key === ' ' ) { return; } const highlightedResult = menu.value.getHighlightedMenuItem(); const resultHighlightedViaKeyboard = menu.value.getHighlightedViaKeyboard(); switch ( e.key ) { case 'Enter': if ( highlightedResult ) { // If this is the search footer and it was highlighted via keyboard nav... if ( highlightedResult.value === MenuFooterValue && resultHighlightedViaKeyboard ) { // Directly navigate to the search footer URL so the link is the same on // both mouse and keyboard. window.location.assign( props.searchFooterUrl ); } else { // Otherwise, handle the item change as usual. But don't prevent the // event, otherwise the form won't be submitted menu.value.delegateKeyNavigation( e, { prevent: false } ); } } expanded.value = false; break; case 'Tab': expanded.value = false; break; default: menu.value.delegateKeyNavigation( e ); break; } } // Manually run onUpdateInputValue to fetch initial results. onMounted( () => { if ( props.initialInputValue ) { onUpdateInputValue( props.initialInputValue, true ); } } ); // When the menu items change, maybe show the menu. // This is the main method of opening the menu of the component, since showing the menu // depends mostly on whether there are any menu items to show. watch( toRef( props, 'searchResults' ), () => { // Now that we have received a response, set the searchQuery to the value of the input. // This ensures that the search footer corresponds to the new search results. searchQuery.value = inputValue.value.trim(); // Show the menu if: // 1. The input is currently focused // 2. Pending state is true, which indicates that the new searchResults value was // returned after new user input // 3. The input is not empty // Whether we open the menu doesn't depend on whether there are results to show, because // we always show the search footer, even if there are no results and the no-results // slot is not set. // Note that the menu may already have been expanded if the pending delay threshold has // been met and the pending state is being displayed to the user. if ( isActive.value && pending.value && searchQuery.value.length > 0 ) { expanded.value = true; } // Make sure pending doesn't get set to true by clearing the timeout function, and // explicitly set pending to false. if ( pendingDelayId !== undefined ) { clearTimeout( pendingDelayId ); pendingDelayId = undefined; } pending.value = false; showPending.value = false; } ); return { form, menu, menuId, highlightedId, selection, menuMessageClass, footer, asSearchResult, inputValue, searchQuery, expanded, showPending, rootClasses, rootStyle, otherAttrs, menuConfig, onUpdateInputValue, onUpdateMenuSelection, onFocus, onBlur, onSearchResultClick, onSearchResultKeyboardNavigation, onSearchFooterClick, onSubmit, onKeydown, MenuFooterValue, articleIcon: cdxIconArticleSearch, translatedSearchResultsLabel }; }, methods: { /** * Focus the component's input element. * * @public */ focus(): void { const searchInput = this.$refs.searchInput as InstanceType<typeof CdxSearchInput>; // Run the searchInput component's focus method, which will set focus // to the <input> within. searchInput.focus(); } } } ); </script> <style lang="less"> @import ( reference ) '@wikimedia/codex-design-tokens/theme-wikimedia-ui.less'; @import ( reference ) '../../themes/mixins/common.less'; @import ( reference ) '../../themes/mixins/icon-alignment.less'; .cdx-typeahead-search { &__menu.cdx-menu { border-top-left-radius: @border-radius-sharp; border-top-right-radius: @border-radius-sharp; } .cdx-menu-item { // Unset padding so we can add it to the anchor elements instead. This is necessary to get // proper styling on the search footer. padding: 0; &__content { padding: @spacing-50 @spacing-75; } } &__search-footer { &.cdx-menu-item { box-sizing: @box-sizing-base; // Set `min-height` on the footer so that it has the same height as the search results. // We can't set it on `&__icon` because the icon would get scaled itself. // Clarify origin of value by calculation instead of component token. /* stylelint-disable-next-line scale-unlimited/declaration-strict-value */ min-height: @min-size-search-figure + ( 2 * @spacing-50 ); &:visited { color: @color-base; } &:hover { text-decoration: @text-decoration-none; cursor: @cursor-base--hover; } } &__icon.cdx-icon { color: @color-subtle; } // We cannot use a pseudo class ":active" because that does not work // in firefox due to the use of "preventDefault" in the menuItem component &__active.cdx-menu-item { .cdx-typeahead-search__search-footer__icon.cdx-icon, .cdx-typeahead-search__search-footer__text { color: @color-progressive; } } } // When props showThumbnail is true, special menu messages (like no results and pending) should // have different padding. .cdx-typeahead-search__menu-message--has-thumbnail { padding-left: @spacing-125; } &--expanded &__input.cdx-search-input .cdx-text-input { border-bottom-left-radius: @border-radius-sharp; border-bottom-right-radius: @border-radius-sharp; } // TODO: Overwrite TextInput default to feature px based `min-size-icon-medium`. // Revisit and remove as soon as we're providing legacy theme to Vector at 14px base. .cdx-text-input--has-start-icon { .cdx-text-input__input { .cdx-mixin-icon-wrapper-padding( start, @spacing-50, @param-size-icon: @min-size-icon-medium ); } } &--show-thumbnail { &.cdx-typeahead-search--auto-expand-width:not( .cdx-typeahead-search--expanded ) { margin-left: @spacing-typeahead-search-focus-addition; } &:not( .cdx-typeahead-search--auto-expand-width ), &.cdx-typeahead-search--auto-expand-width.cdx-typeahead-search--expanded { margin-left: 0; .cdx-text-input__input { .cdx-mixin-icon-wrapper-padding( start, @spacing-start-typeahead-search-figure, @min-size-search-figure ); } .cdx-text-input__start-icon { .cdx-mixin-icon( start, @param-external-padding: @spacing-start-typeahead-search-icon ); } } .cdx-typeahead-search__search-footer { &__icon { // Prevent the icon container from shrinking when large text is present. flex-shrink: 0; // Prevent the icon container from shrinking on smaller base font sizes. min-width: @min-size-search-figure; width: @size-search-figure; } } } // Remove border-top when search-footer is the only menu item .cdx-menu-item:first-child { .cdx-typeahead-search__search-footer { border-top: unset; } } } </style> |