Question

我正在尝试使用使用新角度CLI创建的Angular2项目中的FB SDK。我创建了以下服务来初始化Facebook库，添加了fbsdk类型和所有编译但我无法从项目中的任何位置访问FB全局变量但是“winwow.fbAsyncInit”函数。我可以完美地从控制台检查FB对象，但无法从NG2代码访问它。 ¿想知道问题可能在哪里？

$array = array("a", "b", "c", "d");
$result = "";
foreach ($array as $a)
{
   if ($result != "") { $result .= " & "; }
   $result .= $a;
}
// $result = "a & b & c & d"

Answer 1

密钥是在this.zone.run(callback)的调用中包装回调并将其重新插入Angular 2生命周期。

我在服务构造函数中初始化SDK，与立即加载相比可能会引入一些延迟。尚未找到解决方法。

我还没有决定一旦初始化或包装方法我是否会提供FB的访问者，我会留给你。

@Injectable()
export class FbsdkService {
    public ready = new BehaviorSubject<boolean>(false);

    constructor(
        private zone: NgZone) {
        this.loadSdkAsync(() => {
            FB.init({
                appId: "XXXXXXXXXXX",
                status: false,
                xfbml: false,
                version: "v2.7"
            });
            this.ready.next(true);
        });
    }

    loadSdkAsync(callback: () => void) {
        window.fbAsyncInit = () => this.zone.run(callback);
        // Load the Facebook SDK asynchronously
        const s = "script";
        const id = "facebook-jssdk";
        var js, fjs = document.getElementsByTagName(s)[0];
        if (document.getElementById(id)) return;
        js = document.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/en_US/sdk.js";
        fjs.parentNode.insertBefore(js, fjs)
    }
}

Answer 2

我有类似的问题，这个来源帮助了我很多 - Building CrossPlatform Desktop Applications with Electron

import { Injectable, NgZone } from '@angular/core';
import { BehaviorSubject } from "rxjs/Rx";
import { Http } from '@angular/http';

declare var FB: any;

@Injectable()
export class FbsdkService {
    public ready = new BehaviorSubject<boolean>(false);
    public endpointBase = 'http://graph.facebook.com';
    constructor(private zone: NgZone, private http: Http) {
    }

    public loadSdk() {
        this.loadAsync(() => { });
    }

    public loadAsync(callback: () => void) {
        window.fbAsyncInit = () => this.zone.run(callback);

        const s = "script";
        const id = "facebook-jssdk";
        var js: any, fjs = document.getElementsByTagName(s)[0];
        if (document.getElementById(id)) return;
        js = document.createElement(s);
        js.id = id;
        js.src = "//connect.facebook.net/en_US/sdk.js";
        fjs.parentNode.insertBefore(js, fjs);
    }

    public getLoginStatus() {
        FB.getLoginStatus((response: any) => { console.log(response); });
    }

    public getProfile() {
        return new Promise((resolve, reject) => {
            let fields = [
                "id", "name", "email", "cover", "birthday"
            ];
            FB.api(`/me?fields=${fields.toString()}`, (response: any) => {
                resolve(response);
            });
        });
    }

}

如何从Angular2服务访问FB global？

2 个答案: