@angular/material
Version:
Angular Material
616 lines • 91.3 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Directionality } from '@angular/cdk/bidi';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { DOWN_ARROW, ENTER, ESCAPE, TAB, UP_ARROW } from '@angular/cdk/keycodes';
import { Overlay, OverlayConfig, } from '@angular/cdk/overlay';
import { _getShadowRoot } from '@angular/cdk/platform';
import { TemplatePortal } from '@angular/cdk/portal';
import { ViewportRuler } from '@angular/cdk/scrolling';
import { DOCUMENT } from '@angular/common';
import { ChangeDetectorRef, Directive, ElementRef, forwardRef, Host, Inject, InjectionToken, Input, NgZone, Optional, ViewContainerRef, } from '@angular/core';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
import { _countGroupLabelsBeforeOption, _getOptionScrollPosition, MatOptionSelectionChange, } from '@angular/material/core';
import { MAT_FORM_FIELD, MatFormField } from '@angular/material/form-field';
import { defer, fromEvent, merge, of as observableOf, Subject, Subscription } from 'rxjs';
import { delay, filter, map, switchMap, take, tap } from 'rxjs/operators';
import { MatAutocomplete } from './autocomplete';
import { MatAutocompleteOrigin } from './autocomplete-origin';
/**
* The following style constants are necessary to save here in order
* to properly calculate the scrollTop of the panel. Because we are not
* actually focusing the active item, scroll must be handled manually.
*/
/** The height of each autocomplete option. */
export const AUTOCOMPLETE_OPTION_HEIGHT = 48;
/** The total height of the autocomplete panel. */
export const AUTOCOMPLETE_PANEL_HEIGHT = 256;
/** Injection token that determines the scroll handling while the autocomplete panel is open. */
export const MAT_AUTOCOMPLETE_SCROLL_STRATEGY = new InjectionToken('mat-autocomplete-scroll-strategy');
/** @docs-private */
export function MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY(overlay) {
return () => overlay.scrollStrategies.reposition();
}
/** @docs-private */
export const MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY_PROVIDER = {
provide: MAT_AUTOCOMPLETE_SCROLL_STRATEGY,
deps: [Overlay],
useFactory: MAT_AUTOCOMPLETE_SCROLL_STRATEGY_FACTORY,
};
/**
* Provider that allows the autocomplete to register as a ControlValueAccessor.
* @docs-private
*/
export const MAT_AUTOCOMPLETE_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => MatAutocompleteTrigger),
multi: true
};
/**
* Creates an error to be thrown when attempting to use an autocomplete trigger without a panel.
* @docs-private
*/
export function getMatAutocompleteMissingPanelError() {
return Error('Attempting to open an undefined instance of `mat-autocomplete`. ' +
'Make sure that the id passed to the `matAutocomplete` is correct and that ' +
'you\'re attempting to open it after the ngAfterContentInit hook.');
}
export class MatAutocompleteTrigger {
constructor(_element, _overlay, _viewContainerRef, _zone, _changeDetectorRef, scrollStrategy, _dir, _formField, _document, _viewportRuler) {
this._element = _element;
this._overlay = _overlay;
this._viewContainerRef = _viewContainerRef;
this._zone = _zone;
this._changeDetectorRef = _changeDetectorRef;
this._dir = _dir;
this._formField = _formField;
this._document = _document;
this._viewportRuler = _viewportRuler;
this._componentDestroyed = false;
this._autocompleteDisabled = false;
/** Whether or not the label state is being overridden. */
this._manuallyFloatingLabel = false;
/** Subscription to viewport size changes. */
this._viewportSubscription = Subscription.EMPTY;
/**
* Whether the autocomplete can open the next time it is focused. Used to prevent a focused,
* closed autocomplete from being reopened if the user switches to another browser tab and then
* comes back.
*/
this._canOpenOnNextFocus = true;
/** Stream of keyboard events that can close the panel. */
this._closeKeyEventStream = new Subject();
/**
* Event handler for when the window is blurred. Needs to be an
* arrow function in order to preserve the context.
*/
this._windowBlurHandler = () => {
// If the user blurred the window while the autocomplete is focused, it means that it'll be
// refocused when they come back. In this case we want to skip the first focus event, if the
// pane was closed, in order to avoid reopening it unintentionally.
this._canOpenOnNextFocus =
this._document.activeElement !== this._element.nativeElement || this.panelOpen;
};
/** `View -> model callback called when value changes` */
this._onChange = () => { };
/** `View -> model callback called when autocomplete has been touched` */
this._onTouched = () => { };
/**
* Position of the autocomplete panel relative to the trigger element. A position of `auto`
* will render the panel underneath the trigger if there is enough space for it to fit in
* the viewport, otherwise the panel will be shown above it. If the position is set to
* `above` or `below`, the panel will always be shown above or below the trigger. no matter
* whether it fits completely in the viewport.
*/
this.position = 'auto';
/**
* `autocomplete` attribute to be set on the input element.
* @docs-private
*/
this.autocompleteAttribute = 'off';
this._overlayAttached = false;
/** Stream of autocomplete option selections. */
this.optionSelections = defer(() => {
if (this.autocomplete && this.autocomplete.options) {
return merge(...this.autocomplete.options.map(option => option.onSelectionChange));
}
// If there are any subscribers before `ngAfterViewInit`, the `autocomplete` will be undefined.
// Return a stream that we'll replace with the real one once everything is in place.
return this._zone.onStable
.asObservable()
.pipe(take(1), switchMap(() => this.optionSelections));
});
this._scrollStrategy = scrollStrategy;
}
/**
* Whether the autocomplete is disabled. When disabled, the element will
* act as a regular input and the user won't be able to open the panel.
*/
get autocompleteDisabled() { return this._autocompleteDisabled; }
set autocompleteDisabled(value) {
this._autocompleteDisabled = coerceBooleanProperty(value);
}
ngAfterViewInit() {
const window = this._getWindow();
if (typeof window !== 'undefined') {
this._zone.runOutsideAngular(() => window.addEventListener('blur', this._windowBlurHandler));
}
}
ngOnChanges(changes) {
if (changes['position'] && this._positionStrategy) {
this._setStrategyPositions(this._positionStrategy);
if (this.panelOpen) {
this._overlayRef.updatePosition();
}
}
}
ngOnDestroy() {
const window = this._getWindow();
if (typeof window !== 'undefined') {
window.removeEventListener('blur', this._windowBlurHandler);
}
this._viewportSubscription.unsubscribe();
this._componentDestroyed = true;
this._destroyPanel();
this._closeKeyEventStream.complete();
}
/** Whether or not the autocomplete panel is open. */
get panelOpen() {
return this._overlayAttached && this.autocomplete.showPanel;
}
/** Opens the autocomplete suggestion panel. */
openPanel() {
this._attachOverlay();
this._floatLabel();
}
/** Closes the autocomplete suggestion panel. */
closePanel() {
this._resetLabel();
if (!this._overlayAttached) {
return;
}
if (this.panelOpen) {
// Only emit if the panel was visible.
this.autocomplete.closed.emit();
}
this.autocomplete._isOpen = this._overlayAttached = false;
if (this._overlayRef && this._overlayRef.hasAttached()) {
this._overlayRef.detach();
this._closingActionsSubscription.unsubscribe();
}
// Note that in some cases this can end up being called after the component is destroyed.
// Add a check to ensure that we don't try to run change detection on a destroyed view.
if (!this._componentDestroyed) {
// We need to trigger change detection manually, because
// `fromEvent` doesn't seem to do it at the proper time.
// This ensures that the label is reset when the
// user clicks outside.
this._changeDetectorRef.detectChanges();
}
}
/**
* Updates the position of the autocomplete suggestion panel to ensure that it fits all options
* within the viewport.
*/
updatePosition() {
if (this._overlayAttached) {
this._overlayRef.updatePosition();
}
}
/**
* A stream of actions that should close the autocomplete panel, including
* when an option is selected, on blur, and when TAB is pressed.
*/
get panelClosingActions() {
return merge(this.optionSelections, this.autocomplete._keyManager.tabOut.pipe(filter(() => this._overlayAttached)), this._closeKeyEventStream, this._getOutsideClickStream(), this._overlayRef ?
this._overlayRef.detachments().pipe(filter(() => this._overlayAttached)) :
observableOf()).pipe(
// Normalize the output so we return a consistent type.
map(event => event instanceof MatOptionSelectionChange ? event : null));
}
/** The currently active option, coerced to MatOption type. */
get activeOption() {
if (this.autocomplete && this.autocomplete._keyManager) {
return this.autocomplete._keyManager.activeItem;
}
return null;
}
/** Stream of clicks outside of the autocomplete panel. */
_getOutsideClickStream() {
return merge(fromEvent(this._document, 'click'), fromEvent(this._document, 'touchend'))
.pipe(filter(event => {
// If we're in the Shadow DOM, the event target will be the shadow root, so we have to
// fall back to check the first element in the path of the click event.
const clickTarget = (this._isInsideShadowRoot && event.composedPath ? event.composedPath()[0] :
event.target);
const formField = this._formField ? this._formField._elementRef.nativeElement : null;
const customOrigin = this.connectedTo ? this.connectedTo.elementRef.nativeElement : null;
return this._overlayAttached && clickTarget !== this._element.nativeElement &&
(!formField || !formField.contains(clickTarget)) &&
(!customOrigin || !customOrigin.contains(clickTarget)) &&
(!!this._overlayRef && !this._overlayRef.overlayElement.contains(clickTarget));
}));
}
// Implemented as part of ControlValueAccessor.
writeValue(value) {
Promise.resolve(null).then(() => this._setTriggerValue(value));
}
// Implemented as part of ControlValueAccessor.
registerOnChange(fn) {
this._onChange = fn;
}
// Implemented as part of ControlValueAccessor.
registerOnTouched(fn) {
this._onTouched = fn;
}
// Implemented as part of ControlValueAccessor.
setDisabledState(isDisabled) {
this._element.nativeElement.disabled = isDisabled;
}
_handleKeydown(event) {
const keyCode = event.keyCode;
// Prevent the default action on all escape key presses. This is here primarily to bring IE
// in line with other browsers. By default, pressing escape on IE will cause it to revert
// the input value to the one that it had on focus, however it won't dispatch any events
// which means that the model value will be out of sync with the view.
if (keyCode === ESCAPE) {
event.preventDefault();
}
if (this.activeOption && keyCode === ENTER && this.panelOpen) {
this.activeOption._selectViaInteraction();
this._resetActiveItem();
event.preventDefault();
}
else if (this.autocomplete) {
const prevActiveItem = this.autocomplete._keyManager.activeItem;
const isArrowKey = keyCode === UP_ARROW || keyCode === DOWN_ARROW;
if (this.panelOpen || keyCode === TAB) {
this.autocomplete._keyManager.onKeydown(event);
}
else if (isArrowKey && this._canOpen()) {
this.openPanel();
}
if (isArrowKey || this.autocomplete._keyManager.activeItem !== prevActiveItem) {
this._scrollToOption();
}
}
}
_handleInput(event) {
let target = event.target;
let value = target.value;
// Based on `NumberValueAccessor` from forms.
if (target.type === 'number') {
value = value == '' ? null : parseFloat(value);
}
// If the input has a placeholder, IE will fire the `input` event on page load,
// focus and blur, in addition to when the user actually changed the value. To
// filter out all of the extra events, we save the value on focus and between
// `input` events, and we check whether it changed.
// See: https://connect.microsoft.com/IE/feedback/details/885747/
if (this._previousValue !== value) {
this._previousValue = value;
this._onChange(value);
if (this._canOpen() && this._document.activeElement === event.target) {
this.openPanel();
}
}
}
_handleFocus() {
if (!this._canOpenOnNextFocus) {
this._canOpenOnNextFocus = true;
}
else if (this._canOpen()) {
this._previousValue = this._element.nativeElement.value;
this._attachOverlay();
this._floatLabel(true);
}
}
/**
* In "auto" mode, the label will animate down as soon as focus is lost.
* This causes the value to jump when selecting an option with the mouse.
* This method manually floats the label until the panel can be closed.
* @param shouldAnimate Whether the label should be animated when it is floated.
*/
_floatLabel(shouldAnimate = false) {
if (this._formField && this._formField.floatLabel === 'auto') {
if (shouldAnimate) {
this._formField._animateAndLockLabel();
}
else {
this._formField.floatLabel = 'always';
}
this._manuallyFloatingLabel = true;
}
}
/** If the label has been manually elevated, return it to its normal state. */
_resetLabel() {
if (this._manuallyFloatingLabel) {
this._formField.floatLabel = 'auto';
this._manuallyFloatingLabel = false;
}
}
/**
* Given that we are not actually focusing active options, we must manually adjust scroll
* to reveal options below the fold. First, we find the offset of the option from the top
* of the panel. If that offset is below the fold, the new scrollTop will be the offset -
* the panel height + the option height, so the active option will be just visible at the
* bottom of the panel. If that offset is above the top of the visible panel, the new scrollTop
* will become the offset. If that offset is visible within the panel already, the scrollTop is
* not adjusted.
*/
_scrollToOption() {
const index = this.autocomplete._keyManager.activeItemIndex || 0;
const labelCount = _countGroupLabelsBeforeOption(index, this.autocomplete.options, this.autocomplete.optionGroups);
if (index === 0 && labelCount === 1) {
// If we've got one group label before the option and we're at the top option,
// scroll the list to the top. This is better UX than scrolling the list to the
// top of the option, because it allows the user to read the top group's label.
this.autocomplete._setScrollTop(0);
}
else {
const newScrollPosition = _getOptionScrollPosition(index + labelCount, AUTOCOMPLETE_OPTION_HEIGHT, this.autocomplete._getScrollTop(), AUTOCOMPLETE_PANEL_HEIGHT);
this.autocomplete._setScrollTop(newScrollPosition);
}
}
/**
* This method listens to a stream of panel closing actions and resets the
* stream every time the option list changes.
*/
_subscribeToClosingActions() {
const firstStable = this._zone.onStable.asObservable().pipe(take(1));
const optionChanges = this.autocomplete.options.changes.pipe(tap(() => this._positionStrategy.reapplyLastPosition()),
// Defer emitting to the stream until the next tick, because changing
// bindings in here will cause "changed after checked" errors.
delay(0));
// When the zone is stable initially, and when the option list changes...
return merge(firstStable, optionChanges)
.pipe(
// create a new stream of panelClosingActions, replacing any previous streams
// that were created, and flatten it so our stream only emits closing events...
switchMap(() => {
const wasOpen = this.panelOpen;
this._resetActiveItem();
this.autocomplete._setVisibility();
if (this.panelOpen) {
this._overlayRef.updatePosition();
// If the `panelOpen` state changed, we need to make sure to emit the `opened`
// event, because we may not have emitted it when the panel was attached. This
// can happen if the users opens the panel and there are no options, but the
// options come in slightly later or as a result of the value changing.
if (wasOpen !== this.panelOpen) {
this.autocomplete.opened.emit();
}
}
return this.panelClosingActions;
}),
// when the first closing event occurs...
take(1))
// set the value, close the panel, and complete.
.subscribe(event => this._setValueAndClose(event));
}
/** Destroys the autocomplete suggestion panel. */
_destroyPanel() {
if (this._overlayRef) {
this.closePanel();
this._overlayRef.dispose();
this._overlayRef = null;
}
}
_setTriggerValue(value) {
const toDisplay = this.autocomplete && this.autocomplete.displayWith ?
this.autocomplete.displayWith(value) :
value;
// Simply falling back to an empty string if the display value is falsy does not work properly.
// The display value can also be the number zero and shouldn't fall back to an empty string.
const inputValue = toDisplay != null ? toDisplay : '';
// If it's used within a `MatFormField`, we should set it through the property so it can go
// through change detection.
if (this._formField) {
this._formField._control.value = inputValue;
}
else {
this._element.nativeElement.value = inputValue;
}
this._previousValue = inputValue;
}
/**
* This method closes the panel, and if a value is specified, also sets the associated
* control to that value. It will also mark the control as dirty if this interaction
* stemmed from the user.
*/
_setValueAndClose(event) {
if (event && event.source) {
this._clearPreviousSelectedOption(event.source);
this._setTriggerValue(event.source.value);
this._onChange(event.source.value);
this._element.nativeElement.focus();
this.autocomplete._emitSelectEvent(event.source);
}
this.closePanel();
}
/**
* Clear any previous selected option and emit a selection change event for this option
*/
_clearPreviousSelectedOption(skip) {
this.autocomplete.options.forEach(option => {
if (option != skip && option.selected) {
option.deselect();
}
});
}
_attachOverlay() {
if (!this.autocomplete) {
throw getMatAutocompleteMissingPanelError();
}
// We want to resolve this once, as late as possible so that we can be
// sure that the element has been moved into its final place in the DOM.
if (this._isInsideShadowRoot == null) {
this._isInsideShadowRoot = !!_getShadowRoot(this._element.nativeElement);
}
let overlayRef = this._overlayRef;
if (!overlayRef) {
this._portal = new TemplatePortal(this.autocomplete.template, this._viewContainerRef);
overlayRef = this._overlay.create(this._getOverlayConfig());
this._overlayRef = overlayRef;
// Use the `keydownEvents` in order to take advantage of
// the overlay event targeting provided by the CDK overlay.
overlayRef.keydownEvents().subscribe(event => {
// Close when pressing ESCAPE or ALT + UP_ARROW, based on the a11y guidelines.
// See: https://www.w3.org/TR/wai-aria-practices-1.1/#textbox-keyboard-interaction
if (event.keyCode === ESCAPE || (event.keyCode === UP_ARROW && event.altKey)) {
this._resetActiveItem();
this._closeKeyEventStream.next();
// We need to stop propagation, otherwise the event will eventually
// reach the input itself and cause the overlay to be reopened.
event.stopPropagation();
event.preventDefault();
}
});
this._viewportSubscription = this._viewportRuler.change().subscribe(() => {
if (this.panelOpen && overlayRef) {
overlayRef.updateSize({ width: this._getPanelWidth() });
}
});
}
else {
// Update the trigger, panel width and direction, in case anything has changed.
this._positionStrategy.setOrigin(this._getConnectedElement());
overlayRef.updateSize({ width: this._getPanelWidth() });
}
if (overlayRef && !overlayRef.hasAttached()) {
overlayRef.attach(this._portal);
this._closingActionsSubscription = this._subscribeToClosingActions();
}
const wasOpen = this.panelOpen;
this.autocomplete._setVisibility();
this.autocomplete._isOpen = this._overlayAttached = true;
// We need to do an extra `panelOpen` check in here, because the
// autocomplete won't be shown if there are no options.
if (this.panelOpen && wasOpen !== this.panelOpen) {
this.autocomplete.opened.emit();
}
}
_getOverlayConfig() {
return new OverlayConfig({
positionStrategy: this._getOverlayPosition(),
scrollStrategy: this._scrollStrategy(),
width: this._getPanelWidth(),
direction: this._dir
});
}
_getOverlayPosition() {
const strategy = this._overlay.position()
.flexibleConnectedTo(this._getConnectedElement())
.withFlexibleDimensions(false)
.withPush(false);
this._setStrategyPositions(strategy);
this._positionStrategy = strategy;
return strategy;
}
/** Sets the positions on a position strategy based on the directive's input state. */
_setStrategyPositions(positionStrategy) {
// Note that we provide horizontal fallback positions, even though by default the dropdown
// width matches the input, because consumers can override the width. See #18854.
const belowPositions = [
{ originX: 'start', originY: 'bottom', overlayX: 'start', overlayY: 'top' },
{ originX: 'end', originY: 'bottom', overlayX: 'end', overlayY: 'top' }
];
// The overlay edge connected to the trigger should have squared corners, while
// the opposite end has rounded corners. We apply a CSS class to swap the
// border-radius based on the overlay position.
const panelClass = 'mat-autocomplete-panel-above';
const abovePositions = [
{ originX: 'start', originY: 'top', overlayX: 'start', overlayY: 'bottom', panelClass },
{ originX: 'end', originY: 'top', overlayX: 'end', overlayY: 'bottom', panelClass }
];
let positions;
if (this.position === 'above') {
positions = abovePositions;
}
else if (this.position === 'below') {
positions = belowPositions;
}
else {
positions = [...belowPositions, ...abovePositions];
}
positionStrategy.withPositions(positions);
}
_getConnectedElement() {
if (this.connectedTo) {
return this.connectedTo.elementRef;
}
return this._formField ? this._formField.getConnectedOverlayOrigin() : this._element;
}
_getPanelWidth() {
return this.autocomplete.panelWidth || this._getHostWidth();
}
/** Returns the width of the input element, so the panel width can match it. */
_getHostWidth() {
return this._getConnectedElement().nativeElement.getBoundingClientRect().width;
}
/**
* Resets the active item to -1 so arrow events will activate the
* correct options, or to 0 if the consumer opted into it.
*/
_resetActiveItem() {
this.autocomplete._keyManager.setActiveItem(this.autocomplete.autoActiveFirstOption ? 0 : -1);
}
/** Determines whether the panel can be opened. */
_canOpen() {
const element = this._element.nativeElement;
return !element.readOnly && !element.disabled && !this._autocompleteDisabled;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
var _a;
return ((_a = this._document) === null || _a === void 0 ? void 0 : _a.defaultView) || window;
}
}
MatAutocompleteTrigger.decorators = [
{ type: Directive, args: [{
selector: `input[matAutocomplete], textarea[matAutocomplete]`,
host: {
'class': 'mat-autocomplete-trigger',
'[attr.autocomplete]': 'autocompleteAttribute',
'[attr.role]': 'autocompleteDisabled ? null : "combobox"',
'[attr.aria-autocomplete]': 'autocompleteDisabled ? null : "list"',
'[attr.aria-activedescendant]': '(panelOpen && activeOption) ? activeOption.id : null',
'[attr.aria-expanded]': 'autocompleteDisabled ? null : panelOpen.toString()',
'[attr.aria-owns]': '(autocompleteDisabled || !panelOpen) ? null : autocomplete?.id',
'[attr.aria-haspopup]': '!autocompleteDisabled',
// Note: we use `focusin`, as opposed to `focus`, in order to open the panel
// a little earlier. This avoids issues where IE delays the focusing of the input.
'(focusin)': '_handleFocus()',
'(blur)': '_onTouched()',
'(input)': '_handleInput($event)',
'(keydown)': '_handleKeydown($event)',
},
exportAs: 'matAutocompleteTrigger',
providers: [MAT_AUTOCOMPLETE_VALUE_ACCESSOR]
},] }
];
MatAutocompleteTrigger.ctorParameters = () => [
{ type: ElementRef },
{ type: Overlay },
{ type: ViewContainerRef },
{ type: NgZone },
{ type: ChangeDetectorRef },
{ type: undefined, decorators: [{ type: Inject, args: [MAT_AUTOCOMPLETE_SCROLL_STRATEGY,] }] },
{ type: Directionality, decorators: [{ type: Optional }] },
{ type: MatFormField, decorators: [{ type: Optional }, { type: Inject, args: [MAT_FORM_FIELD,] }, { type: Host }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] },
{ type: ViewportRuler }
];
MatAutocompleteTrigger.propDecorators = {
autocomplete: [{ type: Input, args: ['matAutocomplete',] }],
position: [{ type: Input, args: ['matAutocompletePosition',] }],
connectedTo: [{ type: Input, args: ['matAutocompleteConnectedTo',] }],
autocompleteAttribute: [{ type: Input, args: ['autocomplete',] }],
autocompleteDisabled: [{ type: Input, args: ['matAutocompleteDisabled',] }]
};
//# 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