@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 { Inject, Injectable, InjectionToken, Optional, ɵɵinject } from '@angular/core';
import { DOCUMENT } from '../dom_tokens';
import { PlatformLocation } from './platform_location';
import { joinWithSlash, normalizeQueryParams } from './util';
import * as i0 from "@angular/core";
import * as i1 from "./platform_location";
/**
* Enables the `Location` service to read route state from the browser's URL.
* Angular provides two strategies:
* `HashLocationStrategy` and `PathLocationStrategy`.
*
* Applications should use the `Router` or `Location` services to
* interact with application route state.
*
* For instance, `HashLocationStrategy` produces URLs like
* <code class="no-auto-link">http://example.com#/foo</code>,
* and `PathLocationStrategy` produces
* <code class="no-auto-link">http://example.com/foo</code> as an equivalent URL.
*
* See these two classes for more.
*
* @publicApi
*/
export class LocationStrategy {
historyGo(relativePosition) {
throw new Error('Not implemented');
}
}
LocationStrategy.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: LocationStrategy, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
LocationStrategy.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: LocationStrategy, providedIn: 'root', useFactory: provideLocationStrategy });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: LocationStrategy, decorators: [{
type: Injectable,
args: [{ providedIn: 'root', useFactory: provideLocationStrategy }]
}] });
export function provideLocationStrategy() {
// See #23917
const location = ɵɵinject(DOCUMENT).location;
return new PathLocationStrategy(ɵɵinject(PlatformLocation), location && location.origin || '');
}
/**
* A predefined [DI token](guide/glossary#di-token) for the base href
* to be used with the `PathLocationStrategy`.
* The base href is the URL prefix that should be preserved when generating
* and recognizing URLs.
*
* @usageNotes
*
* The following example shows how to use this token to configure the root app injector
* with a base href value, so that the DI framework can supply the dependency anywhere in the app.
*
* ```typescript
* import {Component, NgModule} from '@angular/core';
* import {APP_BASE_HREF} from '@angular/common';
*
* @NgModule({
* providers: [{provide: APP_BASE_HREF, useValue: '/my/app'}]
* })
* class AppModule {}
* ```
*
* @publicApi
*/
export const APP_BASE_HREF = new InjectionToken('appBaseHref');
/**
* @description
* A {@link LocationStrategy} used to configure the {@link Location} service to
* represent its state in the
* [path](https://en.wikipedia.org/wiki/Uniform_Resource_Locator#Syntax) of the
* browser's URL.
*
* If you're using `PathLocationStrategy`, you must provide a {@link APP_BASE_HREF}
* or add a `<base href>` element to the document.
*
* For instance, if you provide an `APP_BASE_HREF` of `'/my/app/'` and call
* `location.go('/foo')`, the browser's URL will become
* `example.com/my/app/foo`. To ensure all relative URIs resolve correctly,
* the `<base href>` and/or `APP_BASE_HREF` should end with a `/`.
*
* Similarly, if you add `<base href='/my/app/'/>` to the document and call
* `location.go('/foo')`, the browser's URL will become
* `example.com/my/app/foo`.
*
* Note that when using `PathLocationStrategy`, neither the query nor
* the fragment in the `<base href>` will be preserved, as outlined
* by the [RFC](https://tools.ietf.org/html/rfc3986#section-5.2.2).
*
* @usageNotes
*
* ### Example
*
* {@example common/location/ts/path_location_component.ts region='LocationComponent'}
*
* @publicApi
*/
export class PathLocationStrategy extends LocationStrategy {
constructor(_platformLocation, href) {
super();
this._platformLocation = _platformLocation;
this._removeListenerFns = [];
if (href == null) {
href = this._platformLocation.getBaseHrefFromDOM();
}
if (href == null) {
throw new Error(`No base href set. Please provide a value for the APP_BASE_HREF token or add a base element to the document.`);
}
this._baseHref = href;
}
/** @nodoc */
ngOnDestroy() {
while (this._removeListenerFns.length) {
this._removeListenerFns.pop()();
}
}
onPopState(fn) {
this._removeListenerFns.push(this._platformLocation.onPopState(fn), this._platformLocation.onHashChange(fn));
}
getBaseHref() {
return this._baseHref;
}
prepareExternalUrl(internal) {
return joinWithSlash(this._baseHref, internal);
}
path(includeHash = false) {
const pathname = this._platformLocation.pathname + normalizeQueryParams(this._platformLocation.search);
const hash = this._platformLocation.hash;
return hash && includeHash ? `${pathname}${hash}` : pathname;
}
pushState(state, title, url, queryParams) {
const externalUrl = this.prepareExternalUrl(url + normalizeQueryParams(queryParams));
this._platformLocation.pushState(state, title, externalUrl);
}
replaceState(state, title, url, queryParams) {
const externalUrl = this.prepareExternalUrl(url + normalizeQueryParams(queryParams));
this._platformLocation.replaceState(state, title, externalUrl);
}
forward() {
this._platformLocation.forward();
}
back() {
this._platformLocation.back();
}
getState() {
return this._platformLocation.getState();
}
historyGo(relativePosition = 0) {
this._platformLocation.historyGo?.(relativePosition);
}
}
PathLocationStrategy.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: PathLocationStrategy, deps: [{ token: i1.PlatformLocation }, { token: APP_BASE_HREF, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
PathLocationStrategy.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: PathLocationStrategy });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: PathLocationStrategy, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.PlatformLocation }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [APP_BASE_HREF]
}] }]; } });
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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 {Inject, Injectable, InjectionToken, OnDestroy, Optional, ɵɵinject} from '@angular/core';\n\nimport {DOCUMENT} from '../dom_tokens';\n\nimport {LocationChangeListener, PlatformLocation} from './platform_location';\nimport {joinWithSlash, normalizeQueryParams} from './util';\n\n/**\n * Enables the `Location` service to read route state from the browser's URL.\n * Angular provides two strategies:\n * `HashLocationStrategy` and `PathLocationStrategy`.\n *\n * Applications should use the `Router` or `Location` services to\n * interact with application route state.\n *\n * For instance, `HashLocationStrategy` produces URLs like\n * <code class=\"no-auto-link\">http://example.com#/foo</code>,\n * and `PathLocationStrategy` produces\n * <code class=\"no-auto-link\">http://example.com/foo</code> as an equivalent URL.\n *\n * See these two classes for more.\n *\n * @publicApi\n */\n@Injectable({providedIn: 'root', useFactory: provideLocationStrategy})\nexport abstract class LocationStrategy {\n  abstract path(includeHash?: boolean): string;\n  abstract prepareExternalUrl(internal: string): string;\n  abstract getState(): unknown;\n  abstract pushState(state: any, title: string, url: string, queryParams: string): void;\n  abstract replaceState(state: any, title: string, url: string, queryParams: string): void;\n  abstract forward(): void;\n  abstract back(): void;\n  historyGo?(relativePosition: number): void {\n    throw new Error('Not implemented');\n  }\n  abstract onPopState(fn: LocationChangeListener): void;\n  abstract getBaseHref(): string;\n}\n\nexport function provideLocationStrategy() {\n  // See #23917\n  const location = ɵɵinject(DOCUMENT).location;\n  return new PathLocationStrategy(\n      ɵɵinject(PlatformLocation as any), location && location.origin || '');\n}\n\n\n/**\n * A predefined [DI token](guide/glossary#di-token) for the base href\n * to be used with the `PathLocationStrategy`.\n * The base href is the URL prefix that should be preserved when generating\n * and recognizing URLs.\n *\n * @usageNotes\n *\n * The following example shows how to use this token to configure the root app injector\n * with a base href value, so that the DI framework can supply the dependency anywhere in the app.\n *\n * ```typescript\n * import {Component, NgModule} from '@angular/core';\n * import {APP_BASE_HREF} from '@angular/common';\n *\n * @NgModule({\n *   providers: [{provide: APP_BASE_HREF, useValue: '/my/app'}]\n * })\n * class AppModule {}\n * ```\n *\n * @publicApi\n */\nexport const APP_BASE_HREF = new InjectionToken<string>('appBaseHref');\n\n/**\n * @description\n * A {@link LocationStrategy} used to configure the {@link Location} service to\n * represent its state in the\n * [path](https://en.wikipedia.org/wiki/Uniform_Resource_Locator#Syntax) of the\n * browser's URL.\n *\n * If you're using `PathLocationStrategy`, you must provide a {@link APP_BASE_HREF}\n * or add a `<base href>` element to the document.\n *\n * For instance, if you provide an `APP_BASE_HREF` of `'/my/app/'` and call\n * `location.go('/foo')`, the browser's URL will become\n * `example.com/my/app/foo`. To ensure all relative URIs resolve correctly,\n * the `<base href>` and/or `APP_BASE_HREF` should end with a `/`.\n *\n * Similarly, if you add `<base href='/my/app/'/>` to the document and call\n * `location.go('/foo')`, the browser's URL will become\n * `example.com/my/app/foo`.\n *\n * Note that when using `PathLocationStrategy`, neither the query nor\n * the fragment in the `<base href>` will be preserved, as outlined\n * by the [RFC](https://tools.ietf.org/html/rfc3986#section-5.2.2).\n *\n * @usageNotes\n *\n * ### Example\n *\n * {@example common/location/ts/path_location_component.ts region='LocationComponent'}\n *\n * @publicApi\n */\n@Injectable()\nexport class PathLocationStrategy extends LocationStrategy implements OnDestroy {\n  private _baseHref: string;\n  private _removeListenerFns: (() => void)[] = [];\n\n  constructor(\n      private _platformLocation: PlatformLocation,\n      @Optional() @Inject(APP_BASE_HREF) href?: string) {\n    super();\n\n    if (href == null) {\n      href = this._platformLocation.getBaseHrefFromDOM();\n    }\n\n    if (href == null) {\n      throw new Error(\n          `No base href set. Please provide a value for the APP_BASE_HREF token or add a base element to the document.`);\n    }\n\n    this._baseHref = href;\n  }\n\n  /** @nodoc */\n  ngOnDestroy(): void {\n    while (this._removeListenerFns.length) {\n      this._removeListenerFns.pop()!();\n    }\n  }\n\n  override onPopState(fn: LocationChangeListener): void {\n    this._removeListenerFns.push(\n        this._platformLocation.onPopState(fn), this._platformLocation.onHashChange(fn));\n  }\n\n  override getBaseHref(): string {\n    return this._baseHref;\n  }\n\n  override prepareExternalUrl(internal: string): string {\n    return joinWithSlash(this._baseHref, internal);\n  }\n\n  override path(includeHash: boolean = false): string {\n    const pathname =\n        this._platformLocation.pathname + normalizeQueryParams(this._platformLocation.search);\n    const hash = this._platformLocation.hash;\n    return hash && includeHash ? `${pathname}${hash}` : pathname;\n  }\n\n  override pushState(state: any, title: string, url: string, queryParams: string) {\n    const externalUrl = this.prepareExternalUrl(url + normalizeQueryParams(queryParams));\n    this._platformLocation.pushState(state, title, externalUrl);\n  }\n\n  override replaceState(state: any, title: string, url: string, queryParams: string) {\n    const externalUrl = this.prepareExternalUrl(url + normalizeQueryParams(queryParams));\n    this._platformLocation.replaceState(state, title, externalUrl);\n  }\n\n  override forward(): void {\n    this._platformLocation.forward();\n  }\n\n  override back(): void {\n    this._platformLocation.back();\n  }\n\n  override getState(): unknown {\n    return this._platformLocation.getState();\n  }\n\n  override historyGo(relativePosition: number = 0): void {\n    this._platformLocation.historyGo?.(relativePosition);\n  }\n}\n"]}