使用Angular 6补丁程序无法正常工作 [英] Patch form doesn't work well using Angular 6

问题描述

您能问我任何想法吗，我在演示
我想在视图中显示名称城市，然后发布id_city.该演示有效，但如果我删除或添加项目，则此修补程序形式不起作用.

can you ask me any idea please, I have a problem in this demo
I want to show name city in view, and post id_city. This demo works, but if I remove or add items this patch form doesn't work.

我有这个控制权:

city_id: this.client.forEach(x => {

  x.city_id.forEach(cid => {
    //this.formData.push(new FormControl(x.city_id))
    let control = new FormControl(cid, Validators.required);
    (<FormArray>this.myform.controls['city_id']).push(control);

    setTimeout(()=>{
      let cityName = this.city.find(c=> c.city_id == cid).name;
      control.patchValue(cityName, {onlySelf: true, emitEvent:true});
    },100)
  });

})

推荐答案

只需更改tis:

(onSelectionChange)="updateFormProducts($event, item.name, 'city_id', i)"

对此:

(onSelectionChange)="updateFormProducts($event, item.city_id, 'city_id', i)"

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