@angular/common
Version:
Angular - commonly needed directives and services
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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 { Directive, Input, IterableDiffers, TemplateRef, ViewContainerRef } 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/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/built-in-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 futher discussion, see
* [Structural Directives](guide/built-in-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 ((typeof ngDevMode === 'undefined' || ngDevMode) && 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 ${JSON.stringify(fn)}. ` +
`See https://angular.io/api/common/NgForOf#change-propagation for more information.`);
}
}
this._trackByFn = fn;
}
get ngForTrackBy() {
return this._trackByFn;
}
/**
* A reference to the template that is stamped out for each item in the iterable.
* @see [template reference variable](guide/template-reference-variables)
*/
set ngForTemplate(value) {
// TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1
// The current type is too restrictive; a template that just uses index, for example,
// should be acceptable.
if (value) {
this._template = value;
}
}
/**
* Applies the changes when needed.
*/
ngDoCheck() {
if (this._ngForOfDirty) {
this._ngForOfDirty = false;
// React on ngForOf changes only once all inputs have been initialized
const value = this._ngForOf;
if (!this._differ && value) {
try {
this._differ = this._differs.find(value).create(this.ngForTrackBy);
}
catch (_a) {
throw new Error(`Cannot find a differ supporting object '${value}' of type '${getTypeName(value)}'. NgFor only supports binding to Iterables such as Arrays.`);
}
}
}
if (this._differ) {
const changes = this._differ.diff(this._ngForOf);
if (changes)
this._applyChanges(changes);
}
}
_applyChanges(changes) {
const insertTuples = [];
changes.forEachOperation((item, adjustedPreviousIndex, currentIndex) => {
if (item.previousIndex == null) {
// NgForOf is never "null" or "undefined" here because the differ detected
// that a new item needs to be inserted from the iterable. This implies that
// there is an iterable value for "_ngForOf".
const view = this._viewContainer.createEmbeddedView(this._template, new NgForOfContext(null, this._ngForOf, -1, -1), currentIndex === null ? undefined : currentIndex);
const tuple = new RecordViewTuple(item, view);
insertTuples.push(tuple);
}
else if (currentIndex == null) {
this._viewContainer.remove(adjustedPreviousIndex === null ? undefined : adjustedPreviousIndex);
}
else if (adjustedPreviousIndex !== null) {
const view = this._viewContainer.get(adjustedPreviousIndex);
this._viewContainer.move(view, currentIndex);
const tuple = new RecordViewTuple(item, view);
insertTuples.push(tuple);
}
});
for (let i = 0; i < insertTuples.length; i++) {
this._perViewChange(insertTuples[i].view, insertTuples[i].record);
}
for (let i = 0, ilen = this._viewContainer.length; i < ilen; i++) {
const viewRef = this._viewContainer.get(i);
viewRef.context.index = i;
viewRef.context.count = ilen;
viewRef.context.ngForOf = this._ngForOf;
}
changes.forEachIdentityChange((record) => {
const viewRef = this._viewContainer.get(record.currentIndex);
viewRef.context.$implicit = record.item;
});
}
_perViewChange(view, record) {
view.context.$implicit = record.item;
}
/**
* 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.decorators = [
{ type: Directive, args: [{ selector: '[ngFor][ngForOf]' },] }
];
NgForOf.ctorParameters = () => [
{ type: ViewContainerRef },
{ type: TemplateRef },
{ type: IterableDiffers }
];
NgForOf.propDecorators = {
ngForOf: [{ type: Input }],
ngForTrackBy: [{ type: Input }],
ngForTemplate: [{ type: Input }]
};
class RecordViewTuple {
constructor(record, view) {
this.record = record;
this.view = view;
}
}
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} from '@angular/core';\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/built-in-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 futher discussion, see\n * [Structural Directives](guide/built-in-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({selector: '[ngFor][ngForOf]'})\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 ((typeof ngDevMode === 'undefined' || ngDevMode) && 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 ${JSON.stringify(fn)}. ` +\n            `See https://angular.io/api/common/NgForOf#change-propagation for more information.`);\n      }\n    }\n    this._trackByFn = fn;\n  }\n\n  get ngForTrackBy(): TrackByFunction<T> {\n    return this._trackByFn;\n  }\n\n  private _ngForOf: U|undefined|null = null;\n  private _ngForOfDirty: boolean = true;\n  private _differ: IterableDiffer<T>|null = null;\n  // TODO(issue/24571): remove '!'.\n  private _trackByFn!: TrackByFunction<T>;\n\n  constructor(\n      private _viewContainer: ViewContainerRef,\n      private _template: TemplateRef<NgForOfContext<T, U>>, private _differs: IterableDiffers) {}\n\n  /**\n   * A reference to the template that is stamped out for each item in the iterable.\n   * @see [template reference variable](guide/template-reference-variables)\n   */\n  @Input()\n  set ngForTemplate(value: TemplateRef<NgForOfContext<T, U>>) {\n    // TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1\n    // The current type is too restrictive; a template that just uses index, for example,\n    // should be acceptable.\n    if (value) {\n      this._template = value;\n    }\n  }\n\n  /**\n   * Applies the changes when needed.\n   */\n  ngDoCheck(): void {\n    if (this._ngForOfDirty) {\n      this._ngForOfDirty = false;\n      // React on ngForOf changes only once all inputs have been initialized\n      const value = this._ngForOf;\n      if (!this._differ && value) {\n        try {\n          this._differ = this._differs.find(value).create(this.ngForTrackBy);\n        } catch {\n          throw new Error(`Cannot find a differ supporting object '${value}' of type '${\n              getTypeName(value)}'. NgFor only supports binding to Iterables such as Arrays.`);\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 insertTuples: RecordViewTuple<T, U>[] = [];\n    changes.forEachOperation(\n        (item: IterableChangeRecord<any>, 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            const view = this._viewContainer.createEmbeddedView(\n                this._template, new NgForOfContext<T, U>(null!, this._ngForOf!, -1, -1),\n                currentIndex === null ? undefined : currentIndex);\n            const tuple = new RecordViewTuple<T, U>(item, view);\n            insertTuples.push(tuple);\n          } else if (currentIndex == null) {\n            this._viewContainer.remove(\n                adjustedPreviousIndex === null ? undefined : adjustedPreviousIndex);\n          } else if (adjustedPreviousIndex !== null) {\n            const view = this._viewContainer.get(adjustedPreviousIndex)!;\n            this._viewContainer.move(view, currentIndex);\n            const tuple = new RecordViewTuple(item, <EmbeddedViewRef<NgForOfContext<T, U>>>view);\n            insertTuples.push(tuple);\n          }\n        });\n\n    for (let i = 0; i < insertTuples.length; i++) {\n      this._perViewChange(insertTuples[i].view, insertTuples[i].record);\n    }\n\n    for (let i = 0, ilen = this._viewContainer.length; i < ilen; i++) {\n      const viewRef = <EmbeddedViewRef<NgForOfContext<T, U>>>this._viewContainer.get(i);\n      viewRef.context.index = i;\n      viewRef.context.count = ilen;\n      viewRef.context.ngForOf = this._ngForOf!;\n    }\n\n    changes.forEachIdentityChange((record: any) => {\n      const viewRef =\n          <EmbeddedViewRef<NgForOfContext<T, U>>>this._viewContainer.get(record.currentIndex);\n      viewRef.context.$implicit = record.item;\n    });\n  }\n\n  private _perViewChange(\n      view: EmbeddedViewRef<NgForOfContext<T, U>>, record: IterableChangeRecord<any>) {\n    view.context.$implicit = record.item;\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\nclass RecordViewTuple<T, U extends NgIterable<T>> {\n  constructor(public record: any, public view: EmbeddedViewRef<NgForOfContext<T, U>>) {}\n}\n\nfunction getTypeName(type: any): string {\n  return type['name'] || typeof type;\n}\n"]}