@angular/common
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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, TemplateRef, ViewContainerRef, ɵstringify as stringify } from '@angular/core';
import * as i0 from "@angular/core";
/**
* A structural directive that conditionally includes a template based on the value of
* an expression coerced to Boolean.
* When the expression evaluates to true, Angular renders the template
* provided in a `then` clause, and when false or null,
* Angular renders the template provided in an optional `else` clause. The default
* template for the `else` clause is blank.
*
* A [shorthand form](guide/structural-directives#asterisk) of the directive,
* `*ngIf="condition"`, is generally used, provided
* as an attribute of the anchor element for the inserted template.
* Angular expands this into a more explicit version, in which the anchor element
* is contained in an `<ng-template>` element.
*
* Simple form with shorthand syntax:
*
* ```
* <div *ngIf="condition">Content to render when condition is true.</div>
* ```
*
* Simple form with expanded syntax:
*
* ```
* <ng-template [ngIf]="condition"><div>Content to render when condition is
* true.</div></ng-template>
* ```
*
* Form with an "else" block:
*
* ```
* <div *ngIf="condition; else elseBlock">Content to render when condition is true.</div>
* <ng-template #elseBlock>Content to render when condition is false.</ng-template>
* ```
*
* Shorthand form with "then" and "else" blocks:
*
* ```
* <div *ngIf="condition; then thenBlock else elseBlock"></div>
* <ng-template #thenBlock>Content to render when condition is true.</ng-template>
* <ng-template #elseBlock>Content to render when condition is false.</ng-template>
* ```
*
* Form with storing the value locally:
*
* ```
* <div *ngIf="condition as value; else elseBlock">{{value}}</div>
* <ng-template #elseBlock>Content to render when value is null.</ng-template>
* ```
*
* @usageNotes
*
* The `*ngIf` directive is most commonly used to conditionally show an inline template,
* as seen in the following example.
* The default `else` template is blank.
*
* {@example common/ngIf/ts/module.ts region='NgIfSimple'}
*
* ### Showing an alternative template using `else`
*
* To display a template when `expression` evaluates to false, use an `else` template
* binding as shown in the following example.
* The `else` binding points to an `<ng-template>` element labeled `#elseBlock`.
* The template can be defined anywhere in the component view, but is typically placed right after
* `ngIf` for readability.
*
* {@example common/ngIf/ts/module.ts region='NgIfElse'}
*
* ### Using an external `then` template
*
* In the previous example, the then-clause template is specified inline, as the content of the
* tag that contains the `ngIf` directive. You can also specify a template that is defined
* externally, by referencing a labeled `<ng-template>` element. When you do this, you can
* change which template to use at runtime, as shown in the following example.
*
* {@example common/ngIf/ts/module.ts region='NgIfThenElse'}
*
* ### Storing a conditional result in a variable
*
* You might want to show a set of properties from the same object. If you are waiting
* for asynchronous data, the object can be undefined.
* In this case, you can use `ngIf` and store the result of the condition in a local
* variable as shown in the following example.
*
* {@example common/ngIf/ts/module.ts region='NgIfAs'}
*
* This code uses only one `AsyncPipe`, so only one subscription is created.
* The conditional statement stores the result of `userStream|async` in the local variable `user`.
* You can then bind the local `user` repeatedly.
*
* The conditional displays the data only if `userStream` returns a value,
* so you don't need to use the
* safe-navigation-operator (`?.`)
* to guard against null values when accessing properties.
* You can display an alternative template while waiting for the data.
*
* ### Shorthand syntax
*
* The shorthand syntax `*ngIf` expands into two separate template specifications
* for the "then" and "else" clauses. For example, consider the following shorthand statement,
* that is meant to show a loading page while waiting for data to be loaded.
*
* ```
* <div class="hero-list" *ngIf="heroes else loading">
* ...
* </div>
*
* <ng-template #loading>
* <div>Loading...</div>
* </ng-template>
* ```
*
* You can see that the "else" clause references the `<ng-template>`
* with the `#loading` label, and the template for the "then" clause
* is provided as the content of the anchor element.
*
* However, when Angular expands the shorthand syntax, it creates
* another `<ng-template>` tag, with `ngIf` and `ngIfElse` directives.
* The anchor element containing the template for the "then" clause becomes
* the content of this unlabeled `<ng-template>` tag.
*
* ```
* <ng-template [ngIf]="heroes" [ngIfElse]="loading">
* <div class="hero-list">
* ...
* </div>
* </ng-template>
*
* <ng-template #loading>
* <div>Loading...</div>
* </ng-template>
* ```
*
* The presence of the implicit template object has implications for the nesting of
* structural directives. For more on this subject, see
* [Structural Directives](guide/structural-directives#one-per-element).
*
* @ngModule CommonModule
* @publicApi
*/
export class NgIf {
constructor(_viewContainer, templateRef) {
this._viewContainer = _viewContainer;
this._context = new NgIfContext();
this._thenTemplateRef = null;
this._elseTemplateRef = null;
this._thenViewRef = null;
this._elseViewRef = null;
this._thenTemplateRef = templateRef;
}
/**
* The Boolean expression to evaluate as the condition for showing a template.
*/
set ngIf(condition) {
this._context.$implicit = this._context.ngIf = condition;
this._updateView();
}
/**
* A template to show if the condition expression evaluates to true.
*/
set ngIfThen(templateRef) {
assertTemplate('ngIfThen', templateRef);
this._thenTemplateRef = templateRef;
this._thenViewRef = null; // clear previous view if any.
this._updateView();
}
/**
* A template to show if the condition expression evaluates to false.
*/
set ngIfElse(templateRef) {
assertTemplate('ngIfElse', templateRef);
this._elseTemplateRef = templateRef;
this._elseViewRef = null; // clear previous view if any.
this._updateView();
}
_updateView() {
if (this._context.$implicit) {
if (!this._thenViewRef) {
this._viewContainer.clear();
this._elseViewRef = null;
if (this._thenTemplateRef) {
this._thenViewRef =
this._viewContainer.createEmbeddedView(this._thenTemplateRef, this._context);
}
}
}
else {
if (!this._elseViewRef) {
this._viewContainer.clear();
this._thenViewRef = null;
if (this._elseTemplateRef) {
this._elseViewRef =
this._viewContainer.createEmbeddedView(this._elseTemplateRef, this._context);
}
}
}
}
/**
* Asserts the correct type of the context for the template that `NgIf` will render.
*
* The presence of this method is a signal to the Ivy template type-check compiler that the
* `NgIf` structural directive renders its template with a specific context type.
*/
static ngTemplateContextGuard(dir, ctx) {
return true;
}
}
NgIf.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: NgIf, deps: [{ token: i0.ViewContainerRef }, { token: i0.TemplateRef }], target: i0.ɵɵFactoryTarget.Directive });
NgIf.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.0.1", type: NgIf, selector: "[ngIf]", inputs: { ngIf: "ngIf", ngIfThen: "ngIfThen", ngIfElse: "ngIfElse" }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: NgIf, decorators: [{
type: Directive,
args: [{ selector: '[ngIf]' }]
}], ctorParameters: function () { return [{ type: i0.ViewContainerRef }, { type: i0.TemplateRef }]; }, propDecorators: { ngIf: [{
type: Input
}], ngIfThen: [{
type: Input
}], ngIfElse: [{
type: Input
}] } });
/**
* @publicApi
*/
export class NgIfContext {
constructor() {
this.$implicit = null;
this.ngIf = null;
}
}
function assertTemplate(property, templateRef) {
const isTemplateRefOrNull = !!(!templateRef || templateRef.createEmbeddedView);
if (!isTemplateRefOrNull) {
throw new Error(`${property} must be a TemplateRef, but received '${stringify(templateRef)}'.`);
}
}
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The default\n * template for the `else` clause is blank.\n *\n * A [shorthand form](guide/structural-directives#asterisk) of the directive,\n * `*ngIf=\"condition\"`, is generally used, provided\n * as an attribute of the anchor element for the inserted template.\n * Angular expands this into a more explicit version, in which the anchor element\n * is contained in an `<ng-template>` element.\n *\n * Simple form with shorthand syntax:\n *\n * ```\n * <div *ngIf=\"condition\">Content to render when condition is true.</div>\n * ```\n *\n * Simple form with expanded syntax:\n *\n * ```\n * <ng-template [ngIf]=\"condition\"><div>Content to render when condition is\n * true.</div></ng-template>\n * ```\n *\n * Form with an \"else\" block:\n *\n * ```\n * <div *ngIf=\"condition; else elseBlock\">Content to render when condition is true.</div>\n * <ng-template #elseBlock>Content to render when condition is false.</ng-template>\n * ```\n *\n * Shorthand form with \"then\" and \"else\" blocks:\n *\n * ```\n * <div *ngIf=\"condition; then thenBlock else elseBlock\"></div>\n * <ng-template #thenBlock>Content to render when condition is true.</ng-template>\n * <ng-template #elseBlock>Content to render when condition is false.</ng-template>\n * ```\n *\n * Form with storing the value locally:\n *\n * ```\n * <div *ngIf=\"condition as value; else elseBlock\">{{value}}</div>\n * <ng-template #elseBlock>Content to render when value is null.</ng-template>\n * ```\n *\n * @usageNotes\n *\n * The `*ngIf` directive is most commonly used to conditionally show an inline template,\n * as seen in the following  example.\n * The default `else` template is blank.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfSimple'}\n *\n * ### Showing an alternative template using `else`\n *\n * To display a template when `expression` evaluates to false, use an `else` template\n * binding as shown in the following example.\n * The `else` binding points to an `<ng-template>`  element labeled `#elseBlock`.\n * The template can be defined anywhere in the component view, but is typically placed right after\n * `ngIf` for readability.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfElse'}\n *\n * ### Using an external `then` template\n *\n * In the previous example, the then-clause template is specified inline, as the content of the\n * tag that contains the `ngIf` directive. You can also specify a template that is defined\n * externally, by referencing a labeled `<ng-template>` element. When you do this, you can\n * change which template to use at runtime, as shown in the following example.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfThenElse'}\n *\n * ### Storing a conditional result in a variable\n *\n * You might want to show a set of properties from the same object. If you are waiting\n * for asynchronous data, the object can be undefined.\n * In this case, you can use `ngIf` and store the result of the condition in a local\n * variable as shown in the following example.\n *\n * {@example common/ngIf/ts/module.ts region='NgIfAs'}\n *\n * This code uses only one `AsyncPipe`, so only one subscription is created.\n * The conditional statement stores the result of `userStream|async` in the local variable `user`.\n * You can then bind the local `user` repeatedly.\n *\n * The conditional displays the data only if `userStream` returns a value,\n * so you don't need to use the\n * safe-navigation-operator (`?.`)\n * to guard against null values when accessing properties.\n * You can display an alternative template while waiting for the data.\n *\n * ### Shorthand syntax\n *\n * The shorthand syntax `*ngIf` expands into two separate template specifications\n * for the \"then\" and \"else\" clauses. For example, consider the following shorthand statement,\n * that is meant to show a loading page while waiting for data to be loaded.\n *\n * ```\n * <div class=\"hero-list\" *ngIf=\"heroes else loading\">\n *  ...\n * </div>\n *\n * <ng-template #loading>\n *  <div>Loading...</div>\n * </ng-template>\n * ```\n *\n * You can see that the \"else\" clause references the `<ng-template>`\n * with the `#loading` label, and the template for the \"then\" clause\n * is provided as the content of the anchor element.\n *\n * However, when Angular expands the shorthand syntax, it creates\n * another `<ng-template>` tag, with `ngIf` and `ngIfElse` directives.\n * The anchor element containing the template for the \"then\" clause becomes\n * the content of this unlabeled `<ng-template>` tag.\n *\n * ```\n * <ng-template [ngIf]=\"heroes\" [ngIfElse]=\"loading\">\n *  <div class=\"hero-list\">\n *   ...\n *  </div>\n * </ng-template>\n *\n * <ng-template #loading>\n *  <div>Loading...</div>\n * </ng-template>\n * ```\n *\n * The presence of the implicit template object has implications for the nesting of\n * structural directives. For more on this subject, see\n * [Structural Directives](guide/structural-directives#one-per-element).\n *\n * @ngModule CommonModule\n * @publicApi\n */\n@Directive({selector: '[ngIf]'})\nexport class NgIf<T = unknown> {\n  private _context: NgIfContext<T> = new NgIfContext<T>();\n  private _thenTemplateRef: TemplateRef<NgIfContext<T>>|null = null;\n  private _elseTemplateRef: TemplateRef<NgIfContext<T>>|null = null;\n  private _thenViewRef: EmbeddedViewRef<NgIfContext<T>>|null = null;\n  private _elseViewRef: EmbeddedViewRef<NgIfContext<T>>|null = null;\n\n  constructor(private _viewContainer: ViewContainerRef, templateRef: TemplateRef<NgIfContext<T>>) {\n    this._thenTemplateRef = templateRef;\n  }\n\n  /**\n   * The Boolean expression to evaluate as the condition for showing a template.\n   */\n  @Input()\n  set ngIf(condition: T) {\n    this._context.$implicit = this._context.ngIf = condition;\n    this._updateView();\n  }\n\n  /**\n   * A template to show if the condition expression evaluates to true.\n   */\n  @Input()\n  set ngIfThen(templateRef: TemplateRef<NgIfContext<T>>|null) {\n    assertTemplate('ngIfThen', templateRef);\n    this._thenTemplateRef = templateRef;\n    this._thenViewRef = null;  // clear previous view if any.\n    this._updateView();\n  }\n\n  /**\n   * A template to show if the condition expression evaluates to false.\n   */\n  @Input()\n  set ngIfElse(templateRef: TemplateRef<NgIfContext<T>>|null) {\n    assertTemplate('ngIfElse', templateRef);\n    this._elseTemplateRef = templateRef;\n    this._elseViewRef = null;  // clear previous view if any.\n    this._updateView();\n  }\n\n  private _updateView() {\n    if (this._context.$implicit) {\n      if (!this._thenViewRef) {\n        this._viewContainer.clear();\n        this._elseViewRef = null;\n        if (this._thenTemplateRef) {\n          this._thenViewRef =\n              this._viewContainer.createEmbeddedView(this._thenTemplateRef, this._context);\n        }\n      }\n    } else {\n      if (!this._elseViewRef) {\n        this._viewContainer.clear();\n        this._thenViewRef = null;\n        if (this._elseTemplateRef) {\n          this._elseViewRef =\n              this._viewContainer.createEmbeddedView(this._elseTemplateRef, this._context);\n        }\n      }\n    }\n  }\n\n  /** @internal */\n  public static ngIfUseIfTypeGuard: void;\n\n  /**\n   * Assert the correct type of the expression bound to the `ngIf` input within the template.\n   *\n   * The presence of this static field is a signal to the Ivy template type check compiler that\n   * when the `NgIf` structural directive renders its template, the type of the expression bound\n   * to `ngIf` should be narrowed in some way. For `NgIf`, the binding expression itself is used to\n   * narrow its type, which allows the strictNullChecks feature of TypeScript to work with `NgIf`.\n   */\n  static ngTemplateGuard_ngIf: 'binding';\n\n  /**\n   * Asserts the correct type of the context for the template that `NgIf` will render.\n   *\n   * The presence of this method is a signal to the Ivy template type-check compiler that the\n   * `NgIf` structural directive renders its template with a specific context type.\n   */\n  static ngTemplateContextGuard<T>(dir: NgIf<T>, ctx: any):\n      ctx is NgIfContext<Exclude<T, false|0|''|null|undefined>> {\n    return true;\n  }\n}\n\n/**\n * @publicApi\n */\nexport class NgIfContext<T = unknown> {\n  public $implicit: T = null!;\n  public ngIf: T = null!;\n}\n\nfunction assertTemplate(property: string, templateRef: TemplateRef<any>|null): void {\n  const isTemplateRefOrNull = !!(!templateRef || templateRef.createEmbeddedView);\n  if (!isTemplateRefOrNull) {\n    throw new Error(`${property} must be a TemplateRef, but received '${stringify(templateRef)}'.`);\n  }\n}\n"]}