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Angular - commonly needed directives and services

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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.io/license */ import { Directive, Input, IterableDiffers, TemplateRef, ViewContainerRef, ɵRuntimeError as RuntimeError } from '@angular/core'; import * as i0 from "@angular/core"; const NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode; /** * @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/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/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 `<li>` element. * * ``` * <li *ngFor="let item of items; index as i; trackBy: trackByFn">...</li> * ``` * * The shorthand form expands into a long form that uses the `ngForOf` selector * on an `<ng-template>` element. * The content of the `<ng-template>` element is the `<li>` element that held the * short-form directive. * * Here is the expanded version of the short-form example. * * ``` * <ng-template ngFor let-item [ngForOf]="items" let-i="index" [ngForTrackBy]="trackByFn"> * <li>...</li> * </ng-template> * ``` * * 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/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/structural-directives#one-per-element). * * @usageNotes * * ### Local variables * * `NgForOf` provides exported values that can be aliased to local variables. * For example: * * ``` * <li *ngFor="let user of users; index as i; first as isFirst"> * {{i}}/{{users.length}}. {{user}} <span *ngIf="isFirst">default</span> * </li> * ``` * * The following exported values can be aliased to local variables: * * - `$implicit: T`: The value of the individual items in the iterable (`ngForOf`). * - `ngForOf: NgIterable<T>`: 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 `<input>` 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/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/structural-directives) * @ngModule CommonModule * @publicApi */ export class NgForOf { constructor(_viewContainer, _template, _differs) { this._viewContainer = _viewContainer; this._template = _template; this._differs = _differs; this._ngForOf = null; this._ngForOfDirty = true; this._differ = null; } /** * The value of the iterable expression, which can be used as a * [template input variable](guide/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 `TrackByFunction` */ set ngForTrackBy(fn) { if (NG_DEV_MODE && fn != null && typeof fn !== 'function') { // TODO(vicb): use a log service once there is a public one available if (console && console.warn) { console.warn(`trackBy must be a function, but received ${JSON.stringify(fn)}. ` + `See https://angular.io/api/common/NgForOf#change-propagation for more information.`); } } this._trackByFn = fn; } get ngForTrackBy() { return this._trackByFn; } /** * A reference to the template that is stamped out for each item in the iterable. * @see [template reference variable](guide/template-reference-variables) */ set ngForTemplate(value) { // TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1 // The current type is too restrictive; a template that just uses index, for example, // should be acceptable. if (value) { this._template = value; } } /** * Applies the changes when needed. * @nodoc */ ngDoCheck() { if (this._ngForOfDirty) { this._ngForOfDirty = false; // React on ngForOf changes only once all inputs have been initialized const value = this._ngForOf; if (!this._differ && value) { if (NG_DEV_MODE) { try { // CAUTION: this logic is duplicated for production mode below, as the try-catch // is only present in development builds. this._differ = this._differs.find(value).create(this.ngForTrackBy); } catch { let errorMessage = `Cannot find a differ supporting object '${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; } } NgForOf.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: NgForOf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }, { token: i0.IterableDiffers }], target: i0.ɵɵFactoryTarget.Directive }); NgForOf.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.1.0", type: NgForOf, isStandalone: true, selector: "[ngFor][ngForOf]", inputs: { ngForOf: "ngForOf", ngForTrackBy: "ngForTrackBy", ngForTemplate: "ngForTemplate" }, ngImport: i0 }); i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: NgForOf, decorators: [{ type: Directive, args: [{ selector: '[ngFor][ngForOf]', standalone: true, }] }], ctorParameters: function () { return [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }, { type: i0.IterableDiffers }]; }, propDecorators: { ngForOf: [{ type: Input }], ngForTrackBy: [{ type: Input }], ngForTemplate: [{ type: Input }] } }); 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.io/license\n */\n\nimport {Directive, DoCheck, EmbeddedViewRef, Input, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDiffers, NgIterable, TemplateRef, TrackByFunction, ViewContainerRef, ɵRuntimeError as RuntimeError} from '@angular/core';\n\nimport {RuntimeErrorCode} from '../errors';\n\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || !!ngDevMode;\n\n/**\n * @publicApi\n */\nexport class NgForOfContext<T, U extends NgIterable<T> = NgIterable<T>> {\n  constructor(public $implicit: T, public ngForOf: U, public index: number, public count: number) {}\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/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/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/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/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/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/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/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 `TrackByFunction`\n   */\n  @Input()\n  set ngForTrackBy(fn: TrackByFunction<T>) {\n    if (NG_DEV_MODE && fn != null && typeof fn !== 'function') {\n      // TODO(vicb): use a log service once there is a public one available\n      if (<any>console && <any>console.warn) {\n        console.warn(\n            `trackBy must be a function, but received ${JSON.stringify(fn)}. ` +\n            `See https://angular.io/api/common/NgForOf#change-propagation for more information.`);\n      }\n    }\n    this._trackByFn = fn;\n  }\n\n  get ngForTrackBy(): TrackByFunction<T> {\n    return this._trackByFn;\n  }\n\n  private _ngForOf: U|undefined|null = null;\n  private _ngForOfDirty: boolean = true;\n  private _differ: IterableDiffer<T>|null = null;\n  // TODO(issue/24571): remove '!'.\n  private _trackByFn!: TrackByFunction<T>;\n\n  constructor(\n      private _viewContainer: ViewContainerRef,\n      private _template: TemplateRef<NgForOfContext<T, U>>, private _differs: IterableDiffers) {}\n\n  /**\n   * A reference to the template that is stamped out for each item in the iterable.\n   * @see [template reference variable](guide/template-reference-variables)\n   */\n  @Input()\n  set ngForTemplate(value: TemplateRef<NgForOfContext<T, U>>) {\n    // TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1\n    // The current type is too restrictive; a template that just uses index, for example,\n    // should be acceptable.\n    if (value) {\n      this._template = value;\n    }\n  }\n\n  /**\n   * Applies the changes when needed.\n   * @nodoc\n   */\n  ngDoCheck(): void {\n    if (this._ngForOfDirty) {\n      this._ngForOfDirty = false;\n      // React on ngForOf changes only once all inputs have been initialized\n      const value = this._ngForOf;\n      if (!this._differ && value) {\n        if (NG_DEV_MODE) {\n          try {\n            // CAUTION: this logic is duplicated for production mode below, as the try-catch\n            // is only present in development builds.\n            this._differ = this._differs.find(value).create(this.ngForTrackBy);\n          } catch {\n            let errorMessage = `Cannot find a differ supporting object '${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        (item: IterableChangeRecord<T>, adjustedPreviousIndex: number|null,\n         currentIndex: number|null) => {\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, new NgForOfContext<T, U>(item.item, this._ngForOf!, -1, -1),\n                currentIndex === null ? undefined : currentIndex);\n          } else if (currentIndex == null) {\n            viewContainer.remove(\n                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    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>>(dir: NgForOf<T, U>, ctx: any):\n      ctx is NgForOfContext<T, U> {\n    return true;\n  }\n}\n\nfunction applyViewChange<T>(\n    view: EmbeddedViewRef<NgForOfContext<T>>, record: IterableChangeRecord<T>) {\n  view.context.$implicit = record.item;\n}\n\nfunction getTypeName(type: any): string {\n  return type['name'] || typeof type;\n}\n"]}