Angular 2使用Promise/Observable中的值设置APP_BASE_HREF [英] Angular 2 Set APP_BASE_HREF with a value from a Promise / Observable

问题描述

我尝试使用异步rest调用中的值在"CoreModule"中设置APP_BASE_HREF. 我看不到如何完成此操作，因为Provide方法需要返回一个字符串.

I try to set the APP_BASE_HREF in the "CoreModule" with a value from a async rest call. I can't see how this is done, because the provide method needs to return a string.

例如:

@NgModule({
    imports: [
        ...
        HttpModule
    ],
    ...
    providers: [
        ...
        ...
        BackendRequestClass,
        { provide: APP_BASE_HREF, useFactory: () => () => return '/some/path', deps: [], multi: true }
    ],
});

但是当我需要Web服务中的值时，无法返回该字符串. 有什么想法可以做到吗?

but when I need the value from a webservice, I can't return the string. Any ideas how this could be done?

thx

推荐答案

我尝试了您的解决方案. 问题是，当时

I tried your solution. The problem is, that at the time

{ provide: APP_BASE_HREF, useFactory: (config) => config.appBaseHref, deps: [ConfigService] }

尚未设置config.appBaseHref. 当我调试代码时，看到APP_INITIALIZER是在APP_BASE_HREF

the config.appBaseHref is not set yet. When I debug the code I see, that the APP_INITIALIZER is executed after the provider from APP_BASE_HREF

这导致未设置BASE_HREF.

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