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Angular2 如何以编程方式获取 APP_BASE_HREF?

转载 作者:太空狗 更新时间:2023-10-29 17:05:47 25 4
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如何以编程方式获取 APP_BASE_HREF?

我的 app.module.ts 中有这个(APP_BASE='/'):

{
provide: APP_BASE_HREF,
useValue: '<%= APP_BASE %>'
},

我正在尝试:

import { APP_BASE_HREF } from '@angular/common'; 
...
console.debug(APP_BASE_HREF.toString());

在控制台中我得到:

Token appBaseHref

我需要得到:

http://localhost:5555/

最佳答案

感谢 @Günter Zöchbauer 的这些回答:

...我拼凑了一个这样的方法:


index.html

<!DOCTYPE html>
<html lang="en-us">
<head>
<base href="/" />
<meta charset="utf-8" />
<title>Testing APP_BASE_HREF</title>
<link rel="icon" type="image/png" href="favicon.ico" sizes="16x16" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body>
<app-root></app-root>
</body>
</html>

app.module.ts

import { APP_BASE_HREF, PlatformLocation } from "@angular/common";
import { AppComponent } from "./app.component";

/**
* This function is used internal to get a string instance of the `<base href="" />` value from `index.html`.
* This is an exported function, instead of a private function or inline lambda, to prevent this error:
*
* `Error encountered resolving symbol values statically.`
* `Function calls are not supported.`
* `Consider replacing the function or lambda with a reference to an exported function.`
*
* @param platformLocation an Angular service used to interact with a browser's URL
* @return a string instance of the `<base href="" />` value from `index.html`
*/
export function getBaseHref(platformLocation: PlatformLocation): string {
return platformLocation.getBaseHrefFromDOM();
}

@NgModule({
declarations: [
AppComponent
],
providers: [
{
provide: APP_BASE_HREF,
useFactory: getBaseHref,
deps: [PlatformLocation]
}
],
bootstrap: [
AppComponent
]
})
export class AppModule { }

app.component.ts

import { Component, OnInit, Inject } from "@angular/core";
import { APP_BASE_HREF } from "@angular/common";

@Component({
selector: "app-root",
templateUrl: "./app.component.html",
styleUrls: ["./app.component.scss"]
})
export class AppComponent implements OnInit {

constructor(@Inject(APP_BASE_HREF) private baseHref: string) {
console.log(`APP_BASE_HREF is ${this.baseHref}`);
}

ngOnInit(): void {
}
}

app.component.spec.ts

import { TestBed, ComponentFixture, async } from "@angular/core/testing";
import { APP_BASE_HREF } from "@angular/common";

describe("AppComponent", () => {

let component: AppComponent,
fixture: ComponentFixture<AppComponent>;

// configuring dependencies
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [
AppComponent
],
providers: [
{
provide: APP_BASE_HREF,
useValue: "/"
}
]
}).compileComponents();
}));

// getting component
beforeEach(() => {
fixture = TestBed.createComponent(AppComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});

// tests
it("should create the app", async(() => {
const app: any = fixture.debugElement.componentInstance;
expect(app).toBeTruthy();
}));
});

然后你可以做这样的事情:

  1. npm 开始

APP_BASE_HREF will equal the default value set in index.html

  1. npm run build --base-href/foobar/

APP_BASE_HREF will equal the value passed to the base-href flag

关于Angular2 如何以编程方式获取 APP_BASE_HREF?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39287444/

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