typescript patchValue 和 { emitEvent: false } 触发 Angular 4 表单组上的 valueChanges
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patchValue with { emitEvent: false } triggers valueChanges on Angular 4 formgroup
提问by larpo
I have a formbuilder group and am listening for changes with valueChanges and triggering a save function followed by refresh function on the form:
我有一个 formbuilder 组，正在监听 valueChanges 的更改并触发保存功能，然后是表单上的刷新功能：
this.ticketForm.valueChanges.debounceTime(1000).distinctUntilChanged()
.subscribe(data => {
this.saveTicket();
this.refreshTicket();
})
I am then reloading the form and repatching the data to form fields (and elsewhere on the page, particularly a change log) with patchValue, e.g.:
然后我重新加载表单并使用 patchValue 将数据重新分配到表单字段（以及页面上的其他地方，尤其是更改日志），例如：
this.ticketForm.patchValue(ticket, { emitEvent: false });
however, this causes an infinite loop of saves of the form despite emitEvent : false.
然而，尽管有emitEvent : false，这会导致表单保存的无限循环。
Is this an Angular 4/Ionic 3 bug or a misunderstanding on my part?
这是 Angular 4/Ionic 3 的错误还是我的误解？
回答by Lakshay
Try adding onlySelf: truealong with the emitEvent: falsein this way:
试着增加onlySelf: true与一起emitEvent: false以这种方式：
this.ticketForm.patchValue(ticket, {emitEvent: false, onlySelf: true});
回答by Wei Lun
As a workaround, i add skip to rxjs pipe
作为一种解决方法，我将跳过添加到 rxjs 管道
this.form.valueChanges
.pipe(skip(1)).subscribe();
