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package.esm2022.src.directives.ng_for_of.mjs Maven / Gradle / Ivy

/**
 * @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 { Directive, Input, IterableDiffers, TemplateRef, ViewContainerRef, ɵRuntimeError as RuntimeError, } from '@angular/core';
import * as i0 from "@angular/core";
/**
 * @publicApi
 */
export class NgForOfContext {
    constructor($implicit, ngForOf, index, count) {
        this.$implicit = $implicit;
        this.ngForOf = ngForOf;
        this.index = index;
        this.count = count;
    }
    get first() {
        return this.index === 0;
    }
    get last() {
        return this.index === this.count - 1;
    }
    get even() {
        return this.index % 2 === 0;
    }
    get odd() {
        return !this.even;
    }
}
/**
 * A [structural directive](guide/directives/structural-directives) that renders
 * a template for each item in a collection.
 * The directive is placed on an element, which becomes the parent
 * of the cloned templates.
 *
 * The `ngForOf` directive is generally used in the
 * [shorthand form](guide/directives/structural-directives#asterisk) `*ngFor`.
 * In this form, the template to be rendered for each iteration is the content
 * of an anchor element containing the directive.
 *
 * The following example shows the shorthand syntax with some options,
 * contained in an `
` element.
 *
 * ```
 * 
...
 * ```
 *
 * The shorthand form expands into a long form that uses the `ngForOf` selector
 * on an `` element.
 * The content of the `` element is the `
` element that held the
 * short-form directive.
 *
 * Here is the expanded version of the short-form example.
 *
 * ```
 * 
 *   
...
 * 
 * ```
 *
 * Angular automatically expands the shorthand syntax as it compiles the template.
 * The context for each embedded view is logically merged to the current component
 * context according to its lexical position.
 *
 * When using the shorthand syntax, Angular allows only [one structural directive
 * on an element](guide/directives/structural-directives#one-per-element).
 * If you want to iterate conditionally, for example,
 * put the `*ngIf` on a container element that wraps the `*ngFor` element.
 * For further discussion, see
 * [Structural Directives](guide/directives/structural-directives#one-per-element).
 *
 * @usageNotes
 *
 * ### Local variables
 *
 * `NgForOf` provides exported values that can be aliased to local variables.
 * For example:
 *
 *  ```
 * 

 *    {{i}}/{{users.length}}. {{user}} default
 * 
 * ```
 *
 * The following exported values can be aliased to local variables:
 *
 * - `$implicit: T`: The value of the individual items in the iterable (`ngForOf`).
 * - `ngForOf: NgIterable`: The value of the iterable expression. Useful when the expression is
 * more complex then a property access, for example when using the async pipe (`userStreams |
 * async`).
 * - `index: number`: The index of the current item in the iterable.
 * - `count: number`: The length of the iterable.
 * - `first: boolean`: True when the item is the first item in the iterable.
 * - `last: boolean`: True when the item is the last item in the iterable.
 * - `even: boolean`: True when the item has an even index in the iterable.
 * - `odd: boolean`: True when the item has an odd index in the iterable.
 *
 * ### Change propagation
 *
 * When the contents of the iterator changes, `NgForOf` makes the corresponding changes to the DOM:
 *
 * * When an item is added, a new instance of the template is added to the DOM.
 * * When an item is removed, its template instance is removed from the DOM.
 * * When items are reordered, their respective templates are reordered in the DOM.
 *
 * Angular uses object identity to track insertions and deletions within the iterator and reproduce
 * those changes in the DOM. This has important implications for animations and any stateful
 * controls that are present, such as `` elements that accept user input. Inserted rows can
 * be animated in, deleted rows can be animated out, and unchanged rows retain any unsaved state
 * such as user input.
 * For more on animations, see [Transitions and Triggers](guide/animations/transition-and-triggers).
 *
 * The identities of elements in the iterator can change while the data does not.
 * This can happen, for example, if the iterator is produced from an RPC to the server, and that
 * RPC is re-run. Even if the data hasn't changed, the second response produces objects with
 * different identities, and Angular must tear down the entire DOM and rebuild it (as if all old
 * elements were deleted and all new elements inserted).
 *
 * To avoid this expensive operation, you can customize the default tracking algorithm.
 * by supplying the `trackBy` option to `NgForOf`.
 * `trackBy` takes a function that has two arguments: `index` and `item`.
 * If `trackBy` is given, Angular tracks changes by the return value of the function.
 *
 * @see [Structural Directives](guide/directives/structural-directives)
 * @ngModule CommonModule
 * @publicApi
 */
export class NgForOf {
    /**
     * The value of the iterable expression, which can be used as a
     * [template input variable](guide/directives/structural-directives#shorthand).
     */
    set ngForOf(ngForOf) {
        this._ngForOf = ngForOf;
        this._ngForOfDirty = true;
    }
    /**
     * Specifies a custom `TrackByFunction` to compute the identity of items in an iterable.
     *
     * If a custom `TrackByFunction` is not provided, `NgForOf` will use the item's [object
     * identity](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is)
     * as the key.
     *
     * `NgForOf` uses the computed key to associate items in an iterable with DOM elements
     * it produces for these items.
     *
     * A custom `TrackByFunction` is useful to provide good user experience in cases when items in an
     * iterable rendered using `NgForOf` have a natural identifier (for example, custom ID or a
     * primary key), and this iterable could be updated with new object instances that still
     * represent the same underlying entity (for example, when data is re-fetched from the server,
     * and the iterable is recreated and re-rendered, but most of the data is still the same).
     *
     * @see {@link TrackByFunction}
     */
    set ngForTrackBy(fn) {
        if ((typeof ngDevMode === 'undefined' || ngDevMode) && fn != null && typeof fn !== 'function') {
            console.warn(`trackBy must be a function, but received ${JSON.stringify(fn)}. ` +
                `See https://angular.io/api/common/NgForOf#change-propagation for more information.`);
        }
        this._trackByFn = fn;
    }
    get ngForTrackBy() {
        return this._trackByFn;
    }
    constructor(_viewContainer, _template, _differs) {
        this._viewContainer = _viewContainer;
        this._template = _template;
        this._differs = _differs;
        this._ngForOf = null;
        this._ngForOfDirty = true;
        this._differ = null;
    }
    /**
     * A reference to the template that is stamped out for each item in the iterable.
     * @see [template reference variable](guide/templates/variables#template-reference-variables)
     */
    set ngForTemplate(value) {
        // TODO(TS2.1): make TemplateRef>> once we move to TS v2.1
        // The current type is too restrictive; a template that just uses index, for example,
        // should be acceptable.
        if (value) {
            this._template = value;
        }
    }
    /**
     * Applies the changes when needed.
     * @nodoc
     */
    ngDoCheck() {
        if (this._ngForOfDirty) {
            this._ngForOfDirty = false;
            // React on ngForOf changes only once all inputs have been initialized
            const value = this._ngForOf;
            if (!this._differ && value) {
                if (typeof ngDevMode === 'undefined' || ngDevMode) {
                    try {
                        // CAUTION: this logic is duplicated for production mode below, as the try-catch
                        // is only present in development builds.
                        this._differ = this._differs.find(value).create(this.ngForTrackBy);
                    }
                    catch {
                        let errorMessage = `Cannot find a differ supporting object '${value}' of type '` +
                            `${getTypeName(value)}'. NgFor only supports binding to Iterables, such as Arrays.`;
                        if (typeof value === 'object') {
                            errorMessage += ' Did you mean to use the keyvalue pipe?';
                        }
                        throw new RuntimeError(-2200 /* RuntimeErrorCode.NG_FOR_MISSING_DIFFER */, errorMessage);
                    }
                }
                else {
                    // CAUTION: this logic is duplicated for development mode above, as the try-catch
                    // is only present in development builds.
                    this._differ = this._differs.find(value).create(this.ngForTrackBy);
                }
            }
        }
        if (this._differ) {
            const changes = this._differ.diff(this._ngForOf);
            if (changes)
                this._applyChanges(changes);
        }
    }
    _applyChanges(changes) {
        const viewContainer = this._viewContainer;
        changes.forEachOperation((item, adjustedPreviousIndex, currentIndex) => {
            if (item.previousIndex == null) {
                // NgForOf is never "null" or "undefined" here because the differ detected
                // that a new item needs to be inserted from the iterable. This implies that
                // there is an iterable value for "_ngForOf".
                viewContainer.createEmbeddedView(this._template, new NgForOfContext(item.item, this._ngForOf, -1, -1), currentIndex === null ? undefined : currentIndex);
            }
            else if (currentIndex == null) {
                viewContainer.remove(adjustedPreviousIndex === null ? undefined : adjustedPreviousIndex);
            }
            else if (adjustedPreviousIndex !== null) {
                const view = viewContainer.get(adjustedPreviousIndex);
                viewContainer.move(view, currentIndex);
                applyViewChange(view, item);
            }
        });
        for (let i = 0, ilen = viewContainer.length; i < ilen; i++) {
            const viewRef = viewContainer.get(i);
            const context = viewRef.context;
            context.index = i;
            context.count = ilen;
            context.ngForOf = this._ngForOf;
        }
        changes.forEachIdentityChange((record) => {
            const viewRef = viewContainer.get(record.currentIndex);
            applyViewChange(viewRef, record);
        });
    }
    /**
     * Asserts the correct type of the context for the template that `NgForOf` will render.
     *
     * The presence of this method is a signal to the Ivy template type-check compiler that the
     * `NgForOf` structural directive renders its template with a specific context type.
     */
    static ngTemplateContextGuard(dir, ctx) {
        return true;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: NgForOf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }, { token: i0.IterableDiffers }], target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.6", type: NgForOf, isStandalone: true, selector: "[ngFor][ngForOf]", inputs: { ngForOf: "ngForOf", ngForTrackBy: "ngForTrackBy", ngForTemplate: "ngForTemplate" }, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.6", ngImport: i0, type: NgForOf, decorators: [{
            type: Directive,
            args: [{
                    selector: '[ngFor][ngForOf]',
                    standalone: true,
                }]
        }], ctorParameters: () => [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }, { type: i0.IterableDiffers }], propDecorators: { ngForOf: [{
                type: Input
            }], ngForTrackBy: [{
                type: Input
            }], ngForTemplate: [{
                type: Input
            }] } });
// Also export the `NgForOf` class as `NgFor` to improve the DX for
// cases when the directive is used as standalone, so the class name
// matches the CSS selector (*ngFor).
export { NgForOf as NgFor };
function applyViewChange(view, record) {
    view.context.$implicit = record.item;
}
function getTypeName(type) {
    return type['name'] || typeof type;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.dev/license\n */\n\nimport {\n  Directive,\n  DoCheck,\n  EmbeddedViewRef,\n  Input,\n  IterableChangeRecord,\n  IterableChanges,\n  IterableDiffer,\n  IterableDiffers,\n  NgIterable,\n  TemplateRef,\n  TrackByFunction,\n  ViewContainerRef,\n  ɵRuntimeError as RuntimeError,\n} from '@angular/core';\n\nimport {RuntimeErrorCode} from '../errors';\n\n/**\n * @publicApi\n */\nexport class NgForOfContext<T, U extends NgIterable<T> = NgIterable<T>> {\n  constructor(\n    public $implicit: T,\n    public ngForOf: U,\n    public index: number,\n    public count: number,\n  ) {}\n\n  get first(): boolean {\n    return this.index === 0;\n  }\n\n  get last(): boolean {\n    return this.index === this.count - 1;\n  }\n\n  get even(): boolean {\n    return this.index % 2 === 0;\n  }\n\n  get odd(): boolean {\n    return !this.even;\n  }\n}\n\n/**\n * A [structural directive](guide/directives/structural-directives) that renders\n * a template for each item in a collection.\n * The directive is placed on an element, which becomes the parent\n * of the cloned templates.\n *\n * The `ngForOf` directive is generally used in the\n * [shorthand form](guide/directives/structural-directives#asterisk) `*ngFor`.\n * In this form, the template to be rendered for each iteration is the content\n * of an anchor element containing the directive.\n *\n * The following example shows the shorthand syntax with some options,\n * contained in an `<li>` element.\n *\n * ```\n * <li *ngFor=\"let item of items; index as i; trackBy: trackByFn\">...</li>\n * ```\n *\n * The shorthand form expands into a long form that uses the `ngForOf` selector\n * on an `<ng-template>` element.\n * The content of the `<ng-template>` element is the `<li>` element that held the\n * short-form directive.\n *\n * Here is the expanded version of the short-form example.\n *\n * ```\n * <ng-template ngFor let-item [ngForOf]=\"items\" let-i=\"index\" [ngForTrackBy]=\"trackByFn\">\n *   <li>...</li>\n * </ng-template>\n * ```\n *\n * Angular automatically expands the shorthand syntax as it compiles the template.\n * The context for each embedded view is logically merged to the current component\n * context according to its lexical position.\n *\n * When using the shorthand syntax, Angular allows only [one structural directive\n * on an element](guide/directives/structural-directives#one-per-element).\n * If you want to iterate conditionally, for example,\n * put the `*ngIf` on a container element that wraps the `*ngFor` element.\n * For further discussion, see\n * [Structural Directives](guide/directives/structural-directives#one-per-element).\n *\n * @usageNotes\n *\n * ### Local variables\n *\n * `NgForOf` provides exported values that can be aliased to local variables.\n * For example:\n *\n *  ```\n * <li *ngFor=\"let user of users; index as i; first as isFirst\">\n *    {{i}}/{{users.length}}. {{user}} <span *ngIf=\"isFirst\">default</span>\n * </li>\n * ```\n *\n * The following exported values can be aliased to local variables:\n *\n * - `$implicit: T`: The value of the individual items in the iterable (`ngForOf`).\n * - `ngForOf: NgIterable<T>`: The value of the iterable expression. Useful when the expression is\n * more complex then a property access, for example when using the async pipe (`userStreams |\n * async`).\n * - `index: number`: The index of the current item in the iterable.\n * - `count: number`: The length of the iterable.\n * - `first: boolean`: True when the item is the first item in the iterable.\n * - `last: boolean`: True when the item is the last item in the iterable.\n * - `even: boolean`: True when the item has an even index in the iterable.\n * - `odd: boolean`: True when the item has an odd index in the iterable.\n *\n * ### Change propagation\n *\n * When the contents of the iterator changes, `NgForOf` makes the corresponding changes to the DOM:\n *\n * * When an item is added, a new instance of the template is added to the DOM.\n * * When an item is removed, its template instance is removed from the DOM.\n * * When items are reordered, their respective templates are reordered in the DOM.\n *\n * Angular uses object identity to track insertions and deletions within the iterator and reproduce\n * those changes in the DOM. This has important implications for animations and any stateful\n * controls that are present, such as `<input>` elements that accept user input. Inserted rows can\n * be animated in, deleted rows can be animated out, and unchanged rows retain any unsaved state\n * such as user input.\n * For more on animations, see [Transitions and Triggers](guide/animations/transition-and-triggers).\n *\n * The identities of elements in the iterator can change while the data does not.\n * This can happen, for example, if the iterator is produced from an RPC to the server, and that\n * RPC is re-run. Even if the data hasn't changed, the second response produces objects with\n * different identities, and Angular must tear down the entire DOM and rebuild it (as if all old\n * elements were deleted and all new elements inserted).\n *\n * To avoid this expensive operation, you can customize the default tracking algorithm.\n * by supplying the `trackBy` option to `NgForOf`.\n * `trackBy` takes a function that has two arguments: `index` and `item`.\n * If `trackBy` is given, Angular tracks changes by the return value of the function.\n *\n * @see [Structural Directives](guide/directives/structural-directives)\n * @ngModule CommonModule\n * @publicApi\n */\n@Directive({\n  selector: '[ngFor][ngForOf]',\n  standalone: true,\n})\nexport class NgForOf<T, U extends NgIterable<T> = NgIterable<T>> implements DoCheck {\n  /**\n   * The value of the iterable expression, which can be used as a\n   * [template input variable](guide/directives/structural-directives#shorthand).\n   */\n  @Input()\n  set ngForOf(ngForOf: (U & NgIterable<T>) | undefined | null) {\n    this._ngForOf = ngForOf;\n    this._ngForOfDirty = true;\n  }\n  /**\n   * Specifies a custom `TrackByFunction` to compute the identity of items in an iterable.\n   *\n   * If a custom `TrackByFunction` is not provided, `NgForOf` will use the item's [object\n   * identity](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is)\n   * as the key.\n   *\n   * `NgForOf` uses the computed key to associate items in an iterable with DOM elements\n   * it produces for these items.\n   *\n   * A custom `TrackByFunction` is useful to provide good user experience in cases when items in an\n   * iterable rendered using `NgForOf` have a natural identifier (for example, custom ID or a\n   * primary key), and this iterable could be updated with new object instances that still\n   * represent the same underlying entity (for example, when data is re-fetched from the server,\n   * and the iterable is recreated and re-rendered, but most of the data is still the same).\n   *\n   * @see {@link TrackByFunction}\n   */\n  @Input()\n  set ngForTrackBy(fn: TrackByFunction<T>) {\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && fn != null && typeof fn !== 'function') {\n      console.warn(\n        `trackBy must be a function, but received ${JSON.stringify(fn)}. ` +\n          `See https://angular.io/api/common/NgForOf#change-propagation for more information.`,\n      );\n    }\n    this._trackByFn = fn;\n  }\n\n  get ngForTrackBy(): TrackByFunction<T> {\n    return this._trackByFn;\n  }\n\n  private _ngForOf: U | undefined | null = null;\n  private _ngForOfDirty: boolean = true;\n  private _differ: IterableDiffer<T> | null = null;\n  // TODO(issue/24571): remove '!'\n  // waiting for microsoft/typescript#43662 to allow the return type `TrackByFunction|undefined` for\n  // the getter\n  private _trackByFn!: TrackByFunction<T>;\n\n  constructor(\n    private _viewContainer: ViewContainerRef,\n    private _template: TemplateRef<NgForOfContext<T, U>>,\n    private _differs: IterableDiffers,\n  ) {}\n\n  /**\n   * A reference to the template that is stamped out for each item in the iterable.\n   * @see [template reference variable](guide/templates/variables#template-reference-variables)\n   */\n  @Input()\n  set ngForTemplate(value: TemplateRef<NgForOfContext<T, U>>) {\n    // TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1\n    // The current type is too restrictive; a template that just uses index, for example,\n    // should be acceptable.\n    if (value) {\n      this._template = value;\n    }\n  }\n\n  /**\n   * Applies the changes when needed.\n   * @nodoc\n   */\n  ngDoCheck(): void {\n    if (this._ngForOfDirty) {\n      this._ngForOfDirty = false;\n      // React on ngForOf changes only once all inputs have been initialized\n      const value = this._ngForOf;\n      if (!this._differ && value) {\n        if (typeof ngDevMode === 'undefined' || ngDevMode) {\n          try {\n            // CAUTION: this logic is duplicated for production mode below, as the try-catch\n            // is only present in development builds.\n            this._differ = this._differs.find(value).create(this.ngForTrackBy);\n          } catch {\n            let errorMessage =\n              `Cannot find a differ supporting object '${value}' of type '` +\n              `${getTypeName(value)}'. NgFor only supports binding to Iterables, such as Arrays.`;\n            if (typeof value === 'object') {\n              errorMessage += ' Did you mean to use the keyvalue pipe?';\n            }\n            throw new RuntimeError(RuntimeErrorCode.NG_FOR_MISSING_DIFFER, errorMessage);\n          }\n        } else {\n          // CAUTION: this logic is duplicated for development mode above, as the try-catch\n          // is only present in development builds.\n          this._differ = this._differs.find(value).create(this.ngForTrackBy);\n        }\n      }\n    }\n    if (this._differ) {\n      const changes = this._differ.diff(this._ngForOf);\n      if (changes) this._applyChanges(changes);\n    }\n  }\n\n  private _applyChanges(changes: IterableChanges<T>) {\n    const viewContainer = this._viewContainer;\n    changes.forEachOperation(\n      (\n        item: IterableChangeRecord<T>,\n        adjustedPreviousIndex: number | null,\n        currentIndex: number | null,\n      ) => {\n        if (item.previousIndex == null) {\n          // NgForOf is never \"null\" or \"undefined\" here because the differ detected\n          // that a new item needs to be inserted from the iterable. This implies that\n          // there is an iterable value for \"_ngForOf\".\n          viewContainer.createEmbeddedView(\n            this._template,\n            new NgForOfContext<T, U>(item.item, this._ngForOf!, -1, -1),\n            currentIndex === null ? undefined : currentIndex,\n          );\n        } else if (currentIndex == null) {\n          viewContainer.remove(adjustedPreviousIndex === null ? undefined : adjustedPreviousIndex);\n        } else if (adjustedPreviousIndex !== null) {\n          const view = viewContainer.get(adjustedPreviousIndex)!;\n          viewContainer.move(view, currentIndex);\n          applyViewChange(view as EmbeddedViewRef<NgForOfContext<T, U>>, item);\n        }\n      },\n    );\n\n    for (let i = 0, ilen = viewContainer.length; i < ilen; i++) {\n      const viewRef = <EmbeddedViewRef<NgForOfContext<T, U>>>viewContainer.get(i);\n      const context = viewRef.context;\n      context.index = i;\n      context.count = ilen;\n      context.ngForOf = this._ngForOf!;\n    }\n\n    changes.forEachIdentityChange((record: any) => {\n      const viewRef = <EmbeddedViewRef<NgForOfContext<T, U>>>viewContainer.get(record.currentIndex);\n      applyViewChange(viewRef, record);\n    });\n  }\n\n  /**\n   * Asserts the correct type of the context for the template that `NgForOf` will render.\n   *\n   * The presence of this method is a signal to the Ivy template type-check compiler that the\n   * `NgForOf` structural directive renders its template with a specific context type.\n   */\n  static ngTemplateContextGuard<T, U extends NgIterable<T>>(\n    dir: NgForOf<T, U>,\n    ctx: any,\n  ): ctx is NgForOfContext<T, U> {\n    return true;\n  }\n}\n\n// Also export the `NgForOf` class as `NgFor` to improve the DX for\n// cases when the directive is used as standalone, so the class name\n// matches the CSS selector (*ngFor).\nexport {NgForOf as NgFor};\n\nfunction applyViewChange<T>(\n  view: EmbeddedViewRef<NgForOfContext<T>>,\n  record: IterableChangeRecord<T>,\n) {\n  view.context.$implicit = record.item;\n}\n\nfunction getTypeName(type: any): string {\n  return type['name'] || typeof type;\n}\n"]}