在Google中验证,使用Angular2.
首先,在HTML中,我加载谷歌API库：
//index.html
//...
<script>
var googleApiClientReady = function() {
ng2Gauth.googleApiClientReady(gapi);
}
</script>
<script src="https://apis.google.com/js/client.js?onload=googleApiClientReady"></script>
//...
在Angular2服务之后,我处理谷歌身份验证数据并发出事件通知组件,如果谷歌api准备好了：
//google auth service .ts
import {Injectable,EventEmitter} from 'angular2/core';
@Injectable()
export class GoogleAuthService {
isGoogleApiReady: EventEmitter<boolean>;
constructor() {
window['ng2Gauth'] = this; //is it correct way?
this.isGoogleApiReady = new EventEmitter;
}
//it fires from outside of Angular scope
public googleApiClientReady(gapi){
this.gapi.auth.init( () => {
this.isGapiReady.emit(true);
})
};
//...
在这里,在组件中,我选中复选框,或禁用按钮,并执行其他模板操作.
//gauth component
import {Component} from 'angular2/core';
import {GauthService} from './gauth.service';
@Component({
selector: 'gauth',template: `<input type="checkBox" [(ngModel)]="isReady"> Api ready
export class GauthComponent {
constructor (private _gauthService:GauthService) {
_gauthService.isGoogleApiReady.subscribe( (flag) => this.gapiOnReady(flag) )
public isReady = false
gapiOnReady(flag: boolean) { //it fires,this.isReady = true; //but not affect on template correctly
console.log('gapi loaded')
this._gauthService.checkAuth();
}
}
看起来所有应该都可以工作但是浏览器中存在奇怪的错误(Chrome,FF) – 如果页面加载在活动浏览器的选项卡上 – 看起来没有任何反应 – 复选框没有检查,如果我在浏览器加载页面时打开其他选项卡,全部没关系.
怎么解决？是Angular bug还是我做错了？
解决方法
将NgZone注入组件并使用zone.run()初始化库代码,这样库代码使用区域修补异步API,Angular知道何时需要运行更改检测
var googleApiClientReady;
constructor(private zone: NgZone) {
}
public googleApiClientReady(gapi){
zone.run(function () {
this.gapi.auth.init( () => {
this.isGapiReady.emit(true);
})
});
}
和
gapiOnReady(flag: boolean) {
zone.run(function() {
this.isReady = true; //but not affect on template correctly
console.log('gapi loaded')
this._gauthService.checkAuth();
});
}
