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google-maps - 从 Angular 2 服务设置谷歌地图 API key

转载 作者:太空狗 更新时间:2023-10-29 17:57:19 25 4
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我在 Angular 2 应用程序中使用 sebastine google map。我知道 AgmCoreModule.forRoot({ apiKey: "xxxxxxxx"}) 可用于设置 API key ,但我需要从我的 @component 中的 Angular 服务设置 API key 是否可能......需要帮助。

最佳答案

您可能需要更新提供一个像这样的自定义提供程序 { provide: MapsAPILoader, useClass: CustomLazyAPIKeyLoader } 在您导入 AgmCoreModule 的地方。

并在 CustomLazyAPIKeyLoader 类中覆盖加载方法。

import { Injectable, Inject } from '@angular/core';
import { Http, Response, Headers, RequestOptions } from '@angular/http';
import { MapsAPILoader, LAZY_MAPS_API_CONFIG, LazyMapsAPILoaderConfigLiteral, GoogleMapsScriptProtocol } from 'angular2-google-maps/core';
import { DocumentRef, WindowRef } from 'angular2-google-maps/core/utils/browser-globals';

@Injectable()
export class CustomLazyAPIKeyLoader extends MapsAPILoader {
private _scriptLoadingPromise: Promise<void>;
private _config: LazyMapsAPILoaderConfigLiteral;
private _windowRef: WindowRef;
private _documentRef: DocumentRef;

constructor( @Inject(LAZY_MAPS_API_CONFIG) config: any, w: WindowRef, d: DocumentRef, private http: Http) {
super();
this._config = config || {};
this._windowRef = w;
this._documentRef = d;
}

load(): Promise<void> {
if (this._scriptLoadingPromise) {
return this._scriptLoadingPromise;
}

const script = this._documentRef.getNativeDocument().createElement('script');
script.type = 'text/javascript';
script.async = true;
script.defer = true;
const callbackName: string = `angular2GoogleMapsLazyMapsAPILoader`;

this.http.get("getKey")
.subscribe((res: any) => {
this._config.apiKey = res._body;
script.src = this._getScriptSrc(callbackName);
this._documentRef.getNativeDocument().body.appendChild(script);
});

this._scriptLoadingPromise = new Promise<void>((resolve: Function, reject: Function) => {
(<any>this._windowRef.getNativeWindow())[callbackName] = () => { console.log("loaded"); resolve(); };

script.onerror = (error: Event) => { reject(error); };
});


return this._scriptLoadingPromise;
}

private _getScriptSrc(callbackName: string): string {
let protocolType: GoogleMapsScriptProtocol =
(this._config && this._config.protocol) || GoogleMapsScriptProtocol.HTTPS;
let protocol: string;

switch (protocolType) {
case GoogleMapsScriptProtocol.AUTO:
protocol = '';
break;
case GoogleMapsScriptProtocol.HTTP:
protocol = 'http:';
break;
case GoogleMapsScriptProtocol.HTTPS:
protocol = 'https:';
break;
}

const hostAndPath: string = this._config.hostAndPath || 'maps.googleapis.com/maps/api/js';
const queryParams: { [key: string]: string | Array<string> } = {
v: this._config.apiVersion || '3',
callback: callbackName,
key: this._config.apiKey,
client: this._config.clientId,
channel: this._config.channel,
libraries: this._config.libraries,
region: this._config.region,
language: this._config.language
};
const params: string =
Object.keys(queryParams)
.filter((k: string) => queryParams[k] != null)
.filter((k: string) => {
// remove empty arrays
return !Array.isArray(queryParams[k]) ||
(Array.isArray(queryParams[k]) && queryParams[k].length > 0);
})
.map((k: string) => {
// join arrays as comma seperated strings
let i = queryParams[k];
if (Array.isArray(i)) {
return { key: k, value: i.join(',') };
}
return { key: k, value: queryParams[k] };
})
.map((entry: { key: string, value: string }) => { return `${entry.key}=${entry.value}`; })
.join('&');
return `${protocol}//${hostAndPath}?${params}`;
}
}

 this.http.get("getKey")
.subscribe((res: any) => {
this._config.apiKey = res._body;
script.src = this._getScriptSrc(callbackName);
this._documentRef.getNativeDocument().body.appendChild(script);
});

以上代码将使其异步。

关于google-maps - 从 Angular 2 服务设置谷歌地图 API key ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42777296/

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