Question

请问我有什么主意，我对此demo有疑问
我想在视图中显示名称城市，然后发布id_city。该演示有效，但是如果我删除或添加项目，则此修补程序形式不起作用。

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)
  });

})

Answer 1

只需更改tis：

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

对此：

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

使用Angular 6补丁程序无法正常工作

1 个答案: