Angular - 如何将多个"valueChanges"可观察量组合成一个

Question

如何将以下订阅合并为一个？

    this.form.get("type").valueChanges.subscribe(() => {
        this.calcFinalTransports();
    })
    this.form.get("departure").valueChanges.subscribe(() => {
        this.calcFinalTransports();
    })
    this.form.get("destination").valueChanges.subscribe(() => {
        this.calcFinalTransports();
    })
    this.form.get("stations").valueChanges.subscribe(() => {
        this.calcFinalTransports();
    })

Answer 1

您有几个选择,具体取决于您期望的输出.您可能想阅读这篇文章:

• 学习将RxJs序列与超级直观的交互式图表相结合

如果您只是想在任何值更改使用时收到通知merge:

import {merge} from "rxjs/observable/merge";

merge(
    this.form.get("type").valueChanges,
    this.form.get("departure").valueChanges,
    this.form.get("destination").valueChanges
    this.form.get("stations").valueChanges
).subscribe(() => this.calcFinalTransports());