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/**
* @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.dev/license
*/
import {assertInInjectionContext} from '../di';
import {ProviderToken} from '../di/provider_token';
import {
createMultiResultQuerySignalFn,
createSingleResultOptionalQuerySignalFn,
createSingleResultRequiredQuerySignalFn,
} from '../render3/queries/query_reactive';
import {Signal} from '../render3/reactivity/api';
function viewChildFn<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {read?: ProviderToken<ReadT>; debugName?: string},
): Signal<ReadT | undefined> {
ngDevMode && assertInInjectionContext(viewChild);
return createSingleResultOptionalQuerySignalFn<ReadT>(opts);
}
function viewChildRequiredFn<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {read?: ProviderToken<ReadT>; debugName?: string},
): Signal<ReadT> {
ngDevMode && assertInInjectionContext(viewChild);
return createSingleResultRequiredQuerySignalFn<ReadT>(opts);
}
/**
* Type of the `viewChild` function. The viewChild function creates a singular view query.
*
* It is a special function that also provides access to required query results via the `.required`
* property.
*
* @publicApi
* @docsPrivate Ignored because `viewChild` is the canonical API entry.
*/
export interface ViewChildFunction {
/**
* Initializes a view child query. Consider using `viewChild.required` for queries that should
* always match.
*
* @publicAPI
*/
<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT | undefined>;
<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
debugName?: string;
},
): Signal<LocatorT | undefined>;
/**
* Initializes a view child query that is expected to always match an element.
*
* @publicAPI
*/
required: {
<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
debugName?: string;
},
): Signal<LocatorT>;
<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT>;
};
}
/**
* Initializes a view child query.
*
* Consider using `viewChild.required` for queries that should always match.
*
* @usageNotes
* Create a child query in your component by declaring a
* class field and initializing it with the `viewChild()` function.
*
* ```angular-ts
* @Component({template: '<div #el></div><my-component #cmp />'})
* export class Card {
* divEl = viewChild<ElementRef>('el'); // Signal<ElementRef|undefined>
* divElRequired = viewChild.required<ElementRef>('el'); // Signal<ElementRef>
* cmp = viewChild(MyComponent); // Signal<MyComponent|undefined>
* cmpRequired = viewChild.required(MyComponent); // Signal<MyComponent>
* }
* ```
*
* @publicApi 19.0
* @initializerApiFunction
* @see [Referencing component children with queries](guide/components/queries)
* @see [Required queries](guide/components/queries#required-queries)
*/
export const viewChild: ViewChildFunction = (() => {
// Note: This may be considered a side-effect, but nothing will depend on
// this assignment, unless this `viewChild` constant export is accessed. It's a
// self-contained side effect that is local to the user facing `viewChild` export.
(viewChildFn as any).required = viewChildRequiredFn;
return viewChildFn as typeof viewChildFn & {required: typeof viewChildRequiredFn};
})();
export function viewChildren<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {debugName?: string},
): Signal<ReadonlyArray<LocatorT>>;
export function viewChildren<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadonlyArray<ReadT>>;
/**
* Initializes a view children query.
*
* Query results are represented as a signal of a read-only collection containing all matched
* elements.
*
* @usageNotes
* Create a children query in your component by declaring a
* class field and initializing it with the `viewChildren()` function.
*
* ```ts
* @Component({...})
* export class TestComponent {
* divEls = viewChildren<ElementRef>('el'); // Signal<ReadonlyArray<ElementRef>>
* }
* ```
*
* @initializerApiFunction
* @publicApi 19.0
* @see [Referencing component children with queries](guide/components/queries)
* @see [Required queries](guide/components/queries#required-queries)
*/
export function viewChildren<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
read?: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadonlyArray<ReadT>> {
ngDevMode && assertInInjectionContext(viewChildren);
return createMultiResultQuerySignalFn<ReadT>(opts);
}
export function contentChildFn<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT | undefined> {
ngDevMode && assertInInjectionContext(contentChild);
return createSingleResultOptionalQuerySignalFn<ReadT>(opts);
}
function contentChildRequiredFn<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT> {
ngDevMode && assertInInjectionContext(contentChildren);
return createSingleResultRequiredQuerySignalFn<ReadT>(opts);
}
/**
* Type of the `contentChild` function.
*
* The contentChild function creates a singular content query. It is a special function that also
* provides access to required query results via the `.required` property.
*
* @publicApi 19.0
* @docsPrivate Ignored because `contentChild` is the canonical API entry.
*/
export interface ContentChildFunction {
/**
* Initializes a content child query.
*
* Consider using `contentChild.required` for queries that should always match.
* @publicAPI
*/
<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: undefined;
debugName?: string;
},
): Signal<LocatorT | undefined>;
<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
descendants?: boolean;
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT | undefined>;
/**
* Initializes a content child query that is always expected to match.
*/
required: {
<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: undefined;
debugName?: string;
},
): Signal<LocatorT>;
<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
descendants?: boolean;
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadT>;
};
}
/**
* Initializes a content child query. Consider using `contentChild.required` for queries that should
* always match.
*
* @usageNotes
* Create a child query in your component by declaring a
* class field and initializing it with the `contentChild()` function.
*
* ```ts
* @Component({...})
* export class Card {
* headerEl = contentChild<ElementRef>('h'); // Signal<ElementRef|undefined>
* headerElElRequired = contentChild.required<ElementRef>('h'); // Signal<ElementRef>
* header = contentChild(MyHeader); // Signal<MyHeader|undefined>
* headerRequired = contentChild.required(MyHeader); // Signal<MyHeader>
* }
* ```
*
* NOTE: By default `descendants` is `true` which means the query will traverse all descendants in the same template.
*
* @initializerApiFunction
* @publicApi 19.0
*
* @See [Content queries](guide/components/queries#content-queries)
*/
export const contentChild: ContentChildFunction = (() => {
// Note: This may be considered a side-effect, but nothing will depend on
// this assignment, unless this `viewChild` constant export is accessed. It's a
// self-contained side effect that is local to the user facing `viewChild` export.
(contentChildFn as any).required = contentChildRequiredFn;
return contentChildFn as typeof contentChildFn & {required: typeof contentChildRequiredFn};
})();
export function contentChildren<LocatorT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: undefined;
debugName?: string;
},
): Signal<ReadonlyArray<LocatorT>>;
export function contentChildren<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts: {
descendants?: boolean;
read: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadonlyArray<ReadT>>;
/**
* Initializes a content children query.
*
* Query results are represented as a signal of a read-only collection containing all matched
* elements.
*
* @usageNotes
* Create a children query in your component by declaring a
* class field and initializing it with the `contentChildren()` function.
*
* ```ts
* @Component({...})
* export class TestComponent {
* headerEl = contentChildren<ElementRef>('h'); // Signal<ReadonlyArray<ElementRef>>
* }
* ```
*
* Note: By default `descendants` is `false` which means the query will not traverse all descendants in the same template.
*
* @initializerApiFunction
* @publicApi 19.0
* @see [Referencing component children with queries](guide/components/queries)
* @see [Content queries](guide/components/queries#content-queries)
*/
export function contentChildren<LocatorT, ReadT>(
locator: ProviderToken<LocatorT> | string,
opts?: {
descendants?: boolean;
read?: ProviderToken<ReadT>;
debugName?: string;
},
): Signal<ReadonlyArray<ReadT>> {
return createMultiResultQuerySignalFn<ReadT>(opts);
}