5

我正在尝试使用使用新的 Angular 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，一切都编译了，但我无法从项目中的任何地方访问 FB 全局变量，只能访问“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。¿ 知道问题可能出在哪里吗？

import { Injectable, OnInit } from '@angular/core'
import { FACEBOOK_APPID } from '../constants'

@Injectable()
export class fbService implements OnInit{
  constructor(){}
  ngOnInit(){
    if (!window.fbAsyncInit) {
        window.fbAsyncInit = function () {
            FB.init({
                appId: FACEBOOK_APPID,
                xfbml: false,
                version: 'v2.6'
            });
            FB.api("/me",null,()=>{})
            console.log(FB)
        };
    }
    this.initFB()           
}
initFB(){
  var js, id = 'facebook-jssdk', ref = document.getElementsByTagName('script')[0];
    if (document.getElementById(id)) {
        return;
    }
    js = document.createElement('script');
    js.id = id;
    js.async = true;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    ref.parentNode.insertBefore(js, ref);
}
getPost(page:string){
     FB.api(`/${page}/feed?limit=1`,null,(response)=>{console.log(response)})
}
}
4

2 回答 2

1

关键在于调用来this.zone.run(callback)包装回调并将其重新插入到 Angular 2 生命周期中。

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。还没有找到解决方法。

我还没有决定是否要为FB一旦初始化或包装方法提供访问器，我将把它留给你。

@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)
    }
}
于 2016-08-30T01:27:17.893 回答
1

我有类似的问题，这个来源帮助了我很多-使用 Electron 构建 CrossPlatform 桌面应用程序

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);
            });
        });
    }

}
于 2017-12-01T14:02:19.130 回答