如何观看除特定控件之外的所有FormControls ValueChanges?

问题描述

我有一个表格，只要控制输入值发生变化，它就会进行计算.

I have a form that do a computation whenever a control input value changes.

这是我的 form_group 外观:

form_group = this.fb.group({
    control1: [],
    control2: [],
    control3: [],
    ...
    control10: [],
});

我可以通过 form_group.valueChanges 观察到所有控件的值变化，并进行计算.但是我想排除一些不需要执行此操作的控件.

I can detect all controls value changes via form_group.valueChanges observable, and do a computation. However i want to exclude some of the control that doesn't need to do such an action.

但是总有一种方法不检测特定控件上的更改吗?

编写 form_group.get('controlN').valueChanges 并在那里进行计算非常麻烦.我的表单中有5个或更多控件.

It is very burdensome to write a form_group.get('controlN').valueChanges and do a computation there. I have 5 or more controls in my form.

推荐答案

您可以像这样将单个valueChanges Observables合并为一个:

You can merge individual valueChanges Observables into one like so :

Observable.merge(
    [ control1.valueChanges,
      control2.valueChanges ]
  ).subscribe(() => {
    // do your computation
  });

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