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<div
ref="rootElement"
class="cdx-lookup"
:class="rootClasses"
:style="rootStyle"
>
<cdx-text-input
ref="textInput"
v-model="inputValue"
v-bind="otherAttrs"
class="cdx-lookup__input"
role="combobox"
autocomplete="off"
aria-autocomplete="list"
:aria-controls="menuId"
:aria-expanded="expanded"
:aria-activedescendant="highlightedId"
:disabled="computedDisabled"
:status="status"
@update:model-value="onUpdateInput"
@change="$event => $emit( 'change', $event )"
@focus="onInputFocus"
@blur="onInputBlur"
@keydown="onKeydown"
/>
<cdx-menu
:id="menuId"
ref="menu"
v-model:selected="modelWrapper"
v-model:expanded="expanded"
:menu-items="menuItems"
v-bind="menuConfig"
@load-more="$emit( 'load-more' )"
>
<template #default="{ menuItem }">
<!--
@slot Display of an individual item in the menu
@binding {MenuItemData} menu-item The current menu item
-->
<slot name="menu-item" :menu-item="menuItem" />
</template>
<template #no-results>
<!--
@slot Message to show if there are no results to display.
-->
<slot name="no-results" />
</template>
</cdx-menu>
</div>
</template>
<script lang="ts">
import {
defineComponent,
PropType,
Ref,
ComponentPublicInstance,
ref,
toRef,
computed,
watch
} from 'vue';
import CdxMenu from '../menu/Menu.vue';
import CdxTextInput from '../text-input/TextInput.vue';
import useGeneratedId from '../../composables/useGeneratedId';
import useModelWrapper from '../../composables/useModelWrapper';
import useSplitAttributes from '../../composables/useSplitAttributes';
import useFieldData from '../../composables/useFieldData';
import useFloatingMenu from '../../composables/useFloatingMenu';
import { MenuItemData, MenuConfig, ValidationStatusType } from '../../types';
import { ValidationStatusTypes } from '../../constants';
import { makeStringTypeValidator } from '../../utils/stringTypeValidator';
const statusValidator = makeStringTypeValidator( ValidationStatusTypes );
/**
* A predictive text input with a dropdown menu of items.
*/
export default defineComponent( {
name: 'CdxLookup',
components: {
CdxMenu,
CdxTextInput
},
/**
* We want the input to inherit attributes, not the root element.
*/
inheritAttrs: false,
props: {
/**
* Value of the current selection.
*
* Must be bound with `v-model:selected`.
*
* The property should be initialized to `null` rather than using a falsy value.
*/
selected: {
type: [ String, Number, null ] as PropType<string|number|null>,
required: true
},
/**
* Menu items.
*/
menuItems: {
type: Array as PropType<MenuItemData[]>,
required: true
},
/**
* Initial value of the text input.
*/
initialInputValue: {
type: [ String, Number ] as PropType<string|number>,
default: ''
},
/**
* Whether the entire component is disabled.
*/
disabled: {
type: Boolean,
default: false
},
/**
* Configuration for various menu features. All properties default to false.
*
* See the MenuConfig type.
*/
menuConfig: {
type: Object as PropType<MenuConfig>,
default: () => {
return {} as MenuConfig;
}
},
/**
* `status` property of the TextInput component
*/
status: {
type: String as PropType<ValidationStatusType>,
default: 'default',
validator: statusValidator
}
},
emits: [
/**
* When the selected value changes.
*
* @property {string | number | null} selected The new selected value
*/
'update:selected',
/**
* 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',
/**
* When the text input value changes.
*
* @property {string | number} value The new value
*/
'input',
/**
* When an input value change is committed by the user (e.g. on blur)
*
* @property {Event} event
*/
'change',
/**
* When the input comes into focus
*
* @property {FocusEvent} event
*/
'focus',
/**
* When the input loses focus
*
* @property {FocusEvent} event
*/
'blur'
],
setup: ( props, { emit, attrs, slots } ) => {
// Set up local reactive data
const rootElement = ref<HTMLDivElement>();
const textInput = ref<InstanceType<typeof CdxTextInput>>();
const menu = ref<InstanceType<typeof CdxMenu>>();
const menuId = useGeneratedId( 'lookup-menu' );
const pending = ref( false );
const expanded = ref( false );
const isActive = ref( false );
const initialMenuItems = ref( props.menuItems );
const { computedDisabled } = useFieldData( toRef( props, 'disabled' ) );
const selectedProp = toRef( props, 'selected' );
const modelWrapper = useModelWrapper( selectedProp, emit, 'update:selected' );
const selectedMenuItem = computed( () =>
props.menuItems.find( ( item ) => item.value === props.selected )
);
const highlightedId = computed( () => menu.value?.getHighlightedMenuItem()?.id );
// This should not be reactive, so we just read the initial value.
const inputValue = ref( props.initialInputValue );
const internalClasses = computed( () => {
return {
'cdx-lookup--disabled': computedDisabled.value,
'cdx-lookup--pending': pending.value
};
} );
// Get helpers from useSplitAttributes.
const {
rootClasses,
rootStyle,
otherAttrs
} = useSplitAttributes( attrs, internalClasses );
/**
* Handle TextInput model value changes.
*
* @param newVal
*/E
function onUpdateInput( newVal: string|number ) {
// If there is a selection and it doesn't match the new value, clear it.
if (
seleEctedMenuItem.value &&
selectedMenuItem.value.label !== newVal &&
selectedMenuItem.value.value !== newVal
) {
modelWrapper.value = null;
}
// If the input is cleared, close the menu (unless there were initial menu items, as
// the parent component may want to show them again when the input is cleared.
if ( newVal === '' && initialMenuItems.value.length === 0 ) {
expanded.value = false;
pending.value = false;
} else {
// If there is a value, set pending to true.
pending.value = true;
}
emit( 'input', newVal );
}
/**
* On focus, maybe open the menu.
*
* @param event The focus event
*/
function onInputFocus( event: FocusEvent ) {
isActive.value = true;
// One reason to open the menu on focus is if there is input (i.e. the input value is
// not null nor an empty string). Store whether this is the case in this variable.
const hasInput = inputValue.value !== null && inputValue.value !== '';
// Another reason to open the menu on focus is if there are either menu items to show
// or a "no results" message. Store whether this is the case in this variable.
const hasMenuItems = !!( props.menuItems.length > 0 || slots[ 'no-results' ] );
// The menu is open on focus when there are menu items and either an input value or
// initial menu items passed in, e.g. suggested options.
if ( hasMenuItems && ( hasInput || initialMenuItems.value.length > 0 ) ) {
expanded.value = true;
}
emit( 'focus', event );
}
/**
* On blur, close the menu
*
* @param event The focus event
*/
function onInputBlur( event: FocusEvent ) {
isActive.value = false;
expanded.value = false;
emit( 'blur', event );
}
/**
* Conditionally handle key navigation of the menu.
*
* For this component, the user should only be able to use key navigation to open the menu
* if there are menu items (or no-results slot content) to display.
*
* The space key should always do its default function of adding a space character,
* and doesn't open the menu.
*
* @param e
*/
function onKeydown( e: KeyboardEvent ) {
if ( !menu.value ||
computedDisabled.value ||
props.menuItems.length === 0 && !slots[ 'no-results' ] ||
e.key === ' ' ) {
return;
}
menu.value.delegateKeyNavigation( e );
}
useFloatingMenu( textInput as Ref<ComponentPublicInstance>, menu );
// When a new value is selected, update the input value to match.
watch( selectedProp, ( newVal ) => {
// If there is a newVal, including an empty string...
if ( newVal !== null ) {
// If there is a menu item selected, use the label (or the value, if there is no
// label). Otherwise, use an empty string.
const selectedValue = selectedMenuItem.value ?
( selectedMenuItem.value.label ?? selectedMenuItem.value.value ) :
'';
if ( inputValue.value !== selectedValue ) {
// Make sure that the input matches what was selected
inputValue.value = selectedValue;
// We emit the new value to make sure that the menu is filtered correctly
emit( 'input', inputValue.value );
}
}
} );
// When the menu items change, maybe show the menu.
// This is the main method of opening the menu of the Lookup component, since showing
// the menu depends mostly on whether there are any items to show.
watch( toRef( props, 'menuItems' ), ( newVal ) => {
// Show the menu under certain conditions.
if (
// Only show the menu if we were in the pending state (meaning this menuItems change
// was in response to user input) and the menu is still focused
isActive.value && pending.value && (
// Show the menu if there are either menu items or no-results content to show
newVal.length > 0 || slots[ 'no-results' ]
)
) {
expanded.value = true;
}
// Hide the menu if there are no menu items and no no-results content
if ( newVal.length === 0 && !slots[ 'no-results' ] ) {
expanded.value = false;
}
// Clear the pending state
pending.value = false;
} );
return {
rootElement,
textInput,
menu,
menuId,
highlightedId,
inputValue,
modelWrapper,
expanded,
computedDisabled,
onInputBlur,
rootClasses,
rootStyle,
otherAttrs,
onUpdateInput,
onInputFocus,
onKeydown
};
}
} );
</script>
<style lang="less">
@import ( reference ) '@wikimedia/codex-design-tokens/theme-wikimedia-ui.less';
@import ( reference ) '../../themes/mixins/pending-state.less';
.cdx-lookup {
position: relative;
box-sizing: @box-sizing-base;
vertical-align: middle;
&--pending .cdx-text-input .cdx-text-input__input {
.cdx-mixin-pending-state();
}
// Overrides when used within a Dialog component
.cdx-dialog & {
// The menu is positioned relative to the dialog backdrop, not the triggering element.
position: static;
}
}
</style>
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