Angular 6 Reactive Forms Custom Validator 从默认数据中获取错误

Angular 6 Reactive Forms Custom Validator getting error shown from Default Data

我在 FormGroup 中有一个 FormArray,每个 FormArray 都有多个 FormGroup,并且可以动态添加它们。

我有一个自定义验证器,它检查每个 FormArray 中的所有数据以验证数据的重复。目前,它还在自己验证初始数据,这会引发错误。

有什么方法可以限制在检查初始数据时错误自己抛出吗?

添加新数据并与现有数据具有相同值时,它工作正常。

for (let assign of this.additionalAssign) {
      const fg = new FormGroup({
        "payRate": new FormControl(assign.jobRate, Validators.required),
        "position": new FormControl(assign.position, Validators.required),
        "location": new FormControl(assign.location, Validators.required),
        "department": new FormControl(assign.department, Validators.required)
      }); 
      fg.validator = this.jobDataValidator.bind(this);
      this.addPay.push(fg);
    }

验证者:

jobDataValidator(control: FormControl): {[s: string]: boolean} {
        let value = this.getJobLocDeptValidity(control);
        if(value.length > 0){
          return {'sameJobData': true};
        }
        return null;
      }

getJobLocDeptValidity(control: FormControl):any[] {
            let additionalAssignments = this.additionalAssignmentsForm.value.payArray;
            let test = additionalAssignments.filter(item =>  !!control.value.position && item.position ===              !control.value.location && item.location === control.value.location);
            return test;
          }

截图:

Stackblitz Url:https://stackblitz.com/edit/angular-custom-validator-defaultdata

为避免在原始数据上标记错误,您可以添加检查以确保表单控件是 dirty,这意味着用户已触摸它。

if(value.length > 0 && control.dirty){
      return {'sameJobData': true};
}