@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, Host, Input, TemplateRef, ViewContainerRef } from '@angular/core';
export class SwitchView {
constructor(_viewContainerRef, _templateRef) {
this._viewContainerRef = _viewContainerRef;
this._templateRef = _templateRef;
this._created = false;
}
create() {
this._created = true;
this._viewContainerRef.createEmbeddedView(this._templateRef);
}
destroy() {
this._created = false;
this._viewContainerRef.clear();
}
enforceState(created) {
if (created && !this._created) {
this.create();
}
else if (!created && this._created) {
this.destroy();
}
}
}
/**
* @ngModule CommonModule
*
* @description
* The `[ngSwitch]` directive on a container specifies an expression to match against.
* The expressions to match are provided by `ngSwitchCase` directives on views within the container.
* - Every view that matches is rendered.
* - If there are no matches, a view with the `ngSwitchDefault` directive is rendered.
* - Elements within the `[NgSwitch]` statement but outside of any `NgSwitchCase`
* or `ngSwitchDefault` directive are preserved at the location.
*
* @usageNotes
* Define a container element for the directive, and specify the switch expression
* to match against as an attribute:
*
* ```
* <container-element [ngSwitch]="switch_expression">
* ```
*
* Within the container, `*ngSwitchCase` statements specify the match expressions
* as attributes. Include `*ngSwitchDefault` as the final case.
*
* ```
* <container-element [ngSwitch]="switch_expression">
* <some-element *ngSwitchCase="match_expression_1">...</some-element>
* ...
* <some-element *ngSwitchDefault>...</some-element>
* </container-element>
* ```
*
* ### Usage Examples
*
* The following example shows how to use more than one case to display the same view:
*
* ```
* <container-element [ngSwitch]="switch_expression">
* <!-- the same view can be shown in more than one case -->
* <some-element *ngSwitchCase="match_expression_1">...</some-element>
* <some-element *ngSwitchCase="match_expression_2">...</some-element>
* <some-other-element *ngSwitchCase="match_expression_3">...</some-other-element>
* <!--default case when there are no matches -->
* <some-element *ngSwitchDefault>...</some-element>
* </container-element>
* ```
*
* The following example shows how cases can be nested:
* ```
* <container-element [ngSwitch]="switch_expression">
* <some-element *ngSwitchCase="match_expression_1">...</some-element>
* <some-element *ngSwitchCase="match_expression_2">...</some-element>
* <some-other-element *ngSwitchCase="match_expression_3">...</some-other-element>
* <ng-container *ngSwitchCase="match_expression_3">
* <!-- use a ng-container to group multiple root nodes -->
* <inner-element></inner-element>
* <inner-other-element></inner-other-element>
* </ng-container>
* <some-element *ngSwitchDefault>...</some-element>
* </container-element>
* ```
*
* @publicApi
* @see `NgSwitchCase`
* @see `NgSwitchDefault`
* @see [Structural Directives](guide/structural-directives)
*
*/
export class NgSwitch {
constructor() {
this._defaultUsed = false;
this._caseCount = 0;
this._lastCaseCheckIndex = 0;
this._lastCasesMatched = false;
}
set ngSwitch(newValue) {
this._ngSwitch = newValue;
if (this._caseCount === 0) {
this._updateDefaultCases(true);
}
}
/** @internal */
_addCase() {
return this._caseCount++;
}
/** @internal */
_addDefault(view) {
if (!this._defaultViews) {
this._defaultViews = [];
}
this._defaultViews.push(view);
}
/** @internal */
_matchCase(value) {
const matched = value == this._ngSwitch;
this._lastCasesMatched = this._lastCasesMatched || matched;
this._lastCaseCheckIndex++;
if (this._lastCaseCheckIndex === this._caseCount) {
this._updateDefaultCases(!this._lastCasesMatched);
this._lastCaseCheckIndex = 0;
this._lastCasesMatched = false;
}
return matched;
}
_updateDefaultCases(useDefault) {
if (this._defaultViews && useDefault !== this._defaultUsed) {
this._defaultUsed = useDefault;
for (let i = 0; i < this._defaultViews.length; i++) {
const defaultView = this._defaultViews[i];
defaultView.enforceState(useDefault);
}
}
}
}
NgSwitch.decorators = [
{ type: Directive, args: [{ selector: '[ngSwitch]' },] }
];
NgSwitch.propDecorators = {
ngSwitch: [{ type: Input }]
};
/**
* @ngModule CommonModule
*
* @description
* Provides a switch case expression to match against an enclosing `ngSwitch` expression.
* When the expressions match, the given `NgSwitchCase` template is rendered.
* If multiple match expressions match the switch expression value, all of them are displayed.
*
* @usageNotes
*
* Within a switch container, `*ngSwitchCase` statements specify the match expressions
* as attributes. Include `*ngSwitchDefault` as the final case.
*
* ```
* <container-element [ngSwitch]="switch_expression">
* <some-element *ngSwitchCase="match_expression_1">...</some-element>
* ...
* <some-element *ngSwitchDefault>...</some-element>
* </container-element>
* ```
*
* Each switch-case statement contains an in-line HTML template or template reference
* that defines the subtree to be selected if the value of the match expression
* matches the value of the switch expression.
*
* Unlike JavaScript, which uses strict equality, Angular uses loose equality.
* This means that the empty string, `""` matches 0.
*
* @publicApi
* @see `NgSwitch`
* @see `NgSwitchDefault`
*
*/
export class NgSwitchCase {
constructor(viewContainer, templateRef, ngSwitch) {
this.ngSwitch = ngSwitch;
ngSwitch._addCase();
this._view = new SwitchView(viewContainer, templateRef);
}
/**
* Performs case matching. For internal use only.
*/
ngDoCheck() {
this._view.enforceState(this.ngSwitch._matchCase(this.ngSwitchCase));
}
}
NgSwitchCase.decorators = [
{ type: Directive, args: [{ selector: '[ngSwitchCase]' },] }
];
NgSwitchCase.ctorParameters = () => [
{ type: ViewContainerRef },
{ type: TemplateRef },
{ type: NgSwitch, decorators: [{ type: Host }] }
];
NgSwitchCase.propDecorators = {
ngSwitchCase: [{ type: Input }]
};
/**
* @ngModule CommonModule
*
* @description
*
* Creates a view that is rendered when no `NgSwitchCase` expressions
* match the `NgSwitch` expression.
* This statement should be the final case in an `NgSwitch`.
*
* @publicApi
* @see `NgSwitch`
* @see `NgSwitchCase`
*
*/
export class NgSwitchDefault {
constructor(viewContainer, templateRef, ngSwitch) {
ngSwitch._addDefault(new SwitchView(viewContainer, templateRef));
}
}
NgSwitchDefault.decorators = [
{ type: Directive, args: [{ selector: '[ngSwitchDefault]' },] }
];
NgSwitchDefault.ctorParameters = () => [
{ type: ViewContainerRef },
{ type: TemplateRef },
{ type: NgSwitch, decorators: [{ type: Host }] }
];
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Include `*ngSwitchDefault` as the final case.\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *    <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n * ...\n *    <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * ### Usage Examples\n *\n * The following example shows how to use more than one case to display the same view:\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *   <!-- the same view can be shown in more than one case -->\n *   <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *   <some-element *ngSwitchCase=\"match_expression_2\">...</some-element>\n *   <some-other-element *ngSwitchCase=\"match_expression_3\">...</some-other-element>\n *   <!--default case when there are no matches -->\n *   <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * The following example shows how cases can be nested:\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *       <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *       <some-element *ngSwitchCase=\"match_expression_2\">...</some-element>\n *       <some-other-element *ngSwitchCase=\"match_expression_3\">...</some-other-element>\n *       <ng-container *ngSwitchCase=\"match_expression_3\">\n *         <!-- use a ng-container to group multiple root nodes -->\n *         <inner-element></inner-element>\n *         <inner-other-element></inner-other-element>\n *       </ng-container>\n *       <some-element *ngSwitchDefault>...</some-element>\n *     </container-element>\n * ```\n *\n * @publicApi\n * @see `NgSwitchCase`\n * @see `NgSwitchDefault`\n * @see [Structural Directives](guide/structural-directives)\n *\n */\n@Directive({selector: '[ngSwitch]'})\nexport class NgSwitch {\n  // TODO(issue/24571): remove '!'.\n  private _defaultViews!: SwitchView[];\n  private _defaultUsed = false;\n  private _caseCount = 0;\n  private _lastCaseCheckIndex = 0;\n  private _lastCasesMatched = false;\n  private _ngSwitch: any;\n\n  @Input()\n  set ngSwitch(newValue: any) {\n    this._ngSwitch = newValue;\n    if (this._caseCount === 0) {\n      this._updateDefaultCases(true);\n    }\n  }\n\n  /** @internal */\n  _addCase(): number {\n    return this._caseCount++;\n  }\n\n  /** @internal */\n  _addDefault(view: SwitchView) {\n    if (!this._defaultViews) {\n      this._defaultViews = [];\n    }\n    this._defaultViews.push(view);\n  }\n\n  /** @internal */\n  _matchCase(value: any): boolean {\n    const matched = value == this._ngSwitch;\n    this._lastCasesMatched = this._lastCasesMatched || matched;\n    this._lastCaseCheckIndex++;\n    if (this._lastCaseCheckIndex === this._caseCount) {\n      this._updateDefaultCases(!this._lastCasesMatched);\n      this._lastCaseCheckIndex = 0;\n      this._lastCasesMatched = false;\n    }\n    return matched;\n  }\n\n  private _updateDefaultCases(useDefault: boolean) {\n    if (this._defaultViews && useDefault !== this._defaultUsed) {\n      this._defaultUsed = useDefault;\n      for (let i = 0; i < this._defaultViews.length; i++) {\n        const defaultView = this._defaultViews[i];\n        defaultView.enforceState(useDefault);\n      }\n    }\n  }\n}\n\n/**\n * @ngModule CommonModule\n *\n * @description\n * Provides a switch case expression to match against an enclosing `ngSwitch` expression.\n * When the expressions match, the given `NgSwitchCase` template is rendered.\n * If multiple match expressions match the switch expression value, all of them are displayed.\n *\n * @usageNotes\n *\n * Within a switch container, `*ngSwitchCase` statements specify the match expressions\n * as attributes. Include `*ngSwitchDefault` as the final case.\n *\n * ```\n * <container-element [ngSwitch]=\"switch_expression\">\n *   <some-element *ngSwitchCase=\"match_expression_1\">...</some-element>\n *   ...\n *   <some-element *ngSwitchDefault>...</some-element>\n * </container-element>\n * ```\n *\n * Each switch-case statement contains an in-line HTML template or template reference\n * that defines the subtree to be selected if the value of the match expression\n * matches the value of the switch expression.\n *\n * Unlike JavaScript, which uses strict equality, Angular uses loose equality.\n * This means that the empty string, `\"\"` matches 0.\n *\n * @publicApi\n * @see `NgSwitch`\n * @see `NgSwitchDefault`\n *\n */\n@Directive({selector: '[ngSwitchCase]'})\nexport class NgSwitchCase implements DoCheck {\n  private _view: SwitchView;\n  /**\n   * Stores the HTML template to be selected on match.\n   */\n  @Input() ngSwitchCase: any;\n\n  constructor(\n      viewContainer: ViewContainerRef, templateRef: TemplateRef<Object>,\n      @Host() private ngSwitch: NgSwitch) {\n    ngSwitch._addCase();\n    this._view = new SwitchView(viewContainer, templateRef);\n  }\n\n  /**\n   * Performs case matching. For internal use only.\n   */\n  ngDoCheck() {\n    this._view.enforceState(this.ngSwitch._matchCase(this.ngSwitchCase));\n  }\n}\n\n/**\n * @ngModule CommonModule\n *\n * @description\n *\n * Creates a view that is rendered when no `NgSwitchCase` expressions\n * match the `NgSwitch` expression.\n * This statement should be the final case in an `NgSwitch`.\n *\n * @publicApi\n * @see `NgSwitch`\n * @see `NgSwitchCase`\n *\n */\n@Directive({selector: '[ngSwitchDefault]'})\nexport class NgSwitchDefault {\n  constructor(\n      viewContainer: ViewContainerRef, templateRef: TemplateRef<Object>,\n      @Host() ngSwitch: NgSwitch) {\n    ngSwitch._addDefault(new SwitchView(viewContainer, templateRef));\n  }\n}\n"]}