如何使用 Angular 以数组形式设置值 [英] How to set value in array form with Angular

问题描述

我想像这样在数组中设置值:

I want to set value in array like this:

this.form.controls[name].setValue('name')

但我正在处理数组形式，即使我明确传递数组索引，这也不起作用

but I am working with array forms, and this is not working, even if I pass an array index explicitly

例如，这是我的表单数组，我想做的是在函数中设置值

for example, this is my form array and I want to do is to set value in a function

user: FormGroup;
users: FormGroup;

constructor(private fb: FormBuilder) {}
ngOnInit() {
  this.user = this.buildGroup();
  this.users = this.fb.group({
    data: this.fb.array([this.user])
  });
}
get fData() {
  return this.users.get('data') as FormArray;
}
buildGroup() {
  return this.fb.group({
    name: ['', [Validators.required, Validators.minLength(2)]],
    account: this.fb.group({
      email: ['', Validators.required],
      confirm: ['', Validators.required]
    })
  });
}
setValue(index) {
  // This doesn't work
  this.fData[index].controls[name].setValue('name')
}
onSubmit() {
  this.fData.push(this.buildGroup());
  const {valid, value} = this.fData;
  console.log(valid, value);
}

推荐答案

对于数组，需要使用 setControl.像这样:

For arrays, you need to use setControl. Something like this:

    this.productForm = this.fb.group({
        productName: ['', [Validators.required,
                           Validators.minLength(3),
                           Validators.maxLength(50)]],
        productCode: ['', Validators.required],
        starRating: ['', NumberValidators.range(1, 5)],
        tags: this.fb.array([]),
        description: ''
    });

    ...

    // Update the data on the form
    this.productForm.patchValue({
        productName: this.product.productName,
        productCode: this.product.productCode,
        starRating: this.product.starRating,
        description: this.product.description
    });
    this.productForm.setControl('tags', this.fb.array(this.product.tags || []));

这篇关于如何使用 Angular 以数组形式设置值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！