Question

添加自定义验证时，出现如下错误：错误TypeError：无法读取html文件中未定义的属性“ get”，因为我使用了以下验证错误：

我的代码如下：

form: FormGroup;

  ngOnInit()  {

    this.form = this.fb.group({
      test1: [ '', [ Validators.required ] ],
      test2: [''],
      test3: [''],
    }, {
      validator: this.testValidation('test1', 'test2')
    });
  }



function testValidation(test1: string, test2: string) {
  return (group: FormGroup): {[key: string]: any} => {
  let test1 = group.controls[test1];
  let test2 = group.controls[test2];

  if (test1.value !== test2.value) {
  return {
    failTest: true
  };
}
  <form [formGroup]="form" (ngSubmit)="submit()">
    <input type="text" class="form-control" formControlName="test1" >
    <div *ngIf="form.get('test1').hasError('required')>Error1</div>
    <input type="text" class="form-control" formControlName="test2" >
    <div *ngIf="form.get('test2').hasError('failTest')>Error2</div>
 </form>

为什么我在行中出错：

<div *ngIf="form.get('test1').hasError('required')>Error1</div>

Answer 1

以这种方式尝试。

Java Object

查看完整的文档。点击here

Answer 2

尝试：

组件ts：

export class AppComponent implements OnInit {
  form: FormGroup; //define here

  constructor(private fb:FormBuilder){ //initialize in constructor

    this.form = this.fb.group({
    test1: [ '', [ Validators.required ] ],
    test2: [''],
    test3: [''],
  }, {
    validator: this.testValidation('test1', 'test2')
  });
  }

  ngOnInit(){}

  testValidation(test1: string, test2: string) {

    return (group: FormGroup): {[key: string]: any} => {
    let test1 = group.controls['test1'];
    let test2 = group.controls['test2'];

    if (test1.value !== test2.value) {
    return {
      failTest: true
        };
      }
    }
  }
}

html：

<form [formGroup]="form" (ngSubmit)="submit()">
    <input type="text" class="form-control" formControlName="test1" >
    <div *ngIf="form.get('test1').hasError('required')">Error1</div>
    <input type="text" class="form-control" formControlName="test2" >
    <div *ngIf="form.get('test2').hasError('failTest')">Error2</div>
</form>

工作DEMO

表单错误无法读取未定义的属性“ get”

2 个答案: