我有这样的代码:Angular2观察到的流* ngFor
objs = []
getObjs() {
let counter = 0
this.myService.getObjs()
.map((obj) => {
counter = counter > 5 ? 0 : counter;
obj.col = counter;
counter++;
return view
})
.subscribe((obj) => {
console.log(obj);
this.objs = obj;
// I tried this too :
// this.zone.run(() => {
// this.objs.push(obj);
// });
}
, (err)=> console.warn('error in stream', err));
}
this.myService.getObjs是听一个SSE事件流。这里的代码,以防万一:
getObjs(){
var es = new EventSource(this.API + '/stream');
return Observable.create((observer: any) => {
es.onmessage = (event) => {
let msg = JSON.parse(event.data)[0];
if(msg === "complete"){
console.log("received 'complete' signal from server");
es.close();
observer.complete();
}
observer.next(msg);
};
});
}
我在ngOnInit中调用此方法。然后我希望模板在事件到达后立即更新。模板:
<div class="col-md-2">
<thumbnail-dirictive [v]="view" *ngFor="let obj of (objs | column: 0)"></orbit-thumbnail>
</div>
现在,这个日志如预期。流事件到达并被记录。没有发生的事情是该模板没有按顺序更新,即:先来先服务。
我知道我可以传递流作为命名变量,并在模板中使用异步管道,我也尝试传递toArray()方法并获得所有值,一旦他们都到达(我期望在完成回调观察者),我也尝试减少到一个数组缓冲区,其中objs连接到最后,但没有得到任何幸运... 任何人都可以发布一个流的不正常的工作示例到一个ngFor?
编辑1(阐明角版): package.js:
{
"dependencies": {
"@angular/common": "2.0.0",
"@angular/compiler": "2.0.0",
"@angular/core": "2.0.0",
"@angular/forms": "2.0.0",
"@angular/http": "2.0.0",
"@angular/platform-browser": "2.0.0",
"@angular/platform-browser-dynamic": "2.0.0",
"@angular/router": "3.0.0",
"@angular/router-deprecated": "2.0.0-rc.2",
"@angular/upgrade": "2.0.0"
}
}
编辑2(列管码,在应用模块注册):
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({name: 'column'})
export class columnPipe implements PipeTransform {
transform(views, col: number): Array {
return views.filter((view) => {
return view.col === col;
});
}
}
如果使用异步管道,它必须提供数组流。 – 2016-09-23 14:26:16
@torazaburo异步管道没有解决问题。 – Francisco
你从地图而不是'obj'返回“视图”? – BeaverusIV