patchValue 和 { emitEvent: false } 触发 Angular 4 表单组上的 valueChanges [英] patchValue with { emitEvent: false } triggers valueChanges on Angular 4 formgroup

问题描述

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:

I have a formbuilder group and am listening for changes with valueChanges and triggering a save function followed by refresh function on the form:

 this.ticketForm.valueChanges.debounceTime(1000).distinctUntilChanged()
 .subscribe(data => {
   this.saveTicket();
   this.refreshTicket();
 })

然后我重新加载表单并将数据重新分配到带有 patchValue 的表单字段(以及页面上的其他地方，尤其是更改日志)，例如:

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.:

    this.ticketForm.patchValue(ticket, { emitEvent: false });

然而，这会导致表单保存的无限循环，尽管emitEvent : false.

however, this causes an infinite loop of saves of the form despite emitEvent : false.

这是 Angular 4/Ionic 3 的错误还是我的误解?

Is this an Angular 4/Ionic 3 bug or a misunderstanding on my part?

推荐答案

尝试以这种方式添加 onlySelf: true 和 emitEvent: false :

Try adding onlySelf: true along with the emitEvent: false in this way:

this.ticketForm.patchValue(ticket, {emitEvent: false, onlySelf: true});

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