如何将项目附加到 Observable [英] How can I append items to Observable

问题描述

如何将项目附加到 Observable?

这是一些代码:

 this.logEntries = this.controllerService.getLog(this.controller.remoteID, this.skip, this.max);

        this.logEntries.subscribe(a => {
            this.allLogEntries.add(this.logEntries)
        });

这是他们的声明:

 logEntries: Observable<Log[]>;
    allLogEntries: Observable<Log[]> = Observable.empty<Log[]>();

我想将项目附加到 allLogEntries，因为它们是从 Web 服务获取的.我该怎么做?

I want to append items to allLogEntries as they are being fetched from the web service. How do I do this?

推荐答案

也许 scan 操作符可能会让您感兴趣.这是一个示例:

Perhaps the scan operator could interest you. Here is a sample:

obs.startWith([])
 .scan((acc,value) => acc.concat(value))
 .subscribe((data) => {
   console.log(data);
 });

查看此问题了解更多详情:

See this question for more details:

• Angular 2实时"更新对象.

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