模板解析错误 ngFor, FormArray

Question

我正在使用 ReactiveFormsModule 构建动态对象。我的主要模块是 app。然后我有一个子模块config。该组件有 ObjectConfigComponent 和 FieldConfigComponent.

我使用参考构建 here 文章中提到的 plunker 似乎有效。我无法运行我的。

这是我的代码。

export class CompositeObject {
    public fields: Field[];
}

export class Field {
    public name: string;
    public datatype: DataType;
}

export enum DataType {
    string = 1,
    number,
    date
}

ObjectConfigComponent:

import { Component, OnInit } from '@angular/core';
import { CompositeObject } from './../../models/compositeobject';
import { Validators, FormGroup, FormArray, FormBuilder } from '@angular/forms';

@Component({
    selector: 'objectconfig',
    templateUrl: 'objectconfig.component.html'
})
export class ObjectConfigComponent implements OnInit {
    public myForm: FormGroup;
    constructor(private _formbuilder: FormBuilder) { }

    public ngOnInit() {
        this.myForm = this._formbuilder.group({
            fields: this._formbuilder.array([
                this.initField(),
            ])
        });
     }

    public save(model: CompositeObject ) {
         console.log(model);
    }

    private initField() {
        // initialize our address
        return this._formbuilder.group({
            name: ['', Validators.required],
            datatype: ['string', Validators.required]
        });
    }

    private addField() {
    // add address to the list
        const control = <FormArray>this.myForm.controls['fields'];
        control.push(this.initField());
    }

    private removeField(i: number) {
    // remove address from the list
        const control = <FormArray>this.myForm.controls['fields'];
        control.removeAt(i);
    }
}

HTML:

<div class="row">
    <div class="well bs-component">
        <form [formGroup]="myForm" novalidate (ngSubmit)="save(myForm)">
            <!--fields-->
            <div formArrayName="fields">
                <div *ngFor="let field of myForm.controls.fields.controls; let i=index">
                    <div [formGroupName]="i">
                        <fieldform [group]="myForm.controls.fields.controls[i]"></fieldform>
                    </div>
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-10 col-lg-offset-2">
                    <button class="btn btn-link" (click)="addField()">Add another attribute</button>
                </div>
            </div>
            <div class="form-group">
                <div class="col-lg-10 col-lg-offset-2">
                    <button type="reset" class="btn btn-default">Cancel</button>
                    <button type="submit" class="btn btn-primary">Submit</button>
                </div>
            </div>
        </form>
    </div>
</div>

FieldFormComponent

import { Component, OnInit, Input } from '@angular/core';
import { FormGroup } from '@angular/forms';
@Component({
    selector: 'fieldform',
    templateUrl: 'fieldform.component.html'
})
export class FieldFormComponent implements OnInit {
    @Input('group')
    public fieldForm: FormGroup;
    constructor() { }

    ngOnInit() { }
}

HTML

<div [formGroup]="fieldForm">
     <!-- Angular assigns array index as group name by default 0, 1, 2, ... -->
    <div class="form-group">
        <!--name-->
        <label class="col-lg-2 control-label">Attribute</label>
        <div class="col-lg-4">
            <input class="form-control"  id="inputName-{{i}}" type="text" formControlName="name">
            <!--display error message if street is not valid-->
            <small [hidden]="fieldForm.controls.name.valid">
                name is required
            </small>
        </div>
        <!--datatype-->
        <div class="col-lg-4">
            <select class="form-control" formControlName="datatype">
                <option>string</option>
                <option>number</option>
                <option>date</option>
            </select>
        </div>
    </div>
</div>

我收到以下错误：

Error: Uncaught (in promise): Error: Template parse errors: Can't bind to 'ngForOf' since it isn't a known property of 'div'. ("
        <div formArrayName="fields">

            <div [ERROR ->]*ngFor="let field of myForm.controls.fields.controls; let i=index">

                <div [formGr"): ObjectConfigComponent@5:21 Property binding ngForOf not used by any directive on an embedded
template. Make sure that the property name is spelled correctly and all directives are listed in the "directives" section. ("
        <div formArrayName="fields">

            [ERROR ->]<div *ngFor="let field of myForm.controls.fields.controls; let i=index">

                <div [f"): ObjectConfigComponent@5:16

我做错了什么。

Answer 1

添加

imports: [CommonModule]

到包含您的组件的 @NgModule(...)。别忘了导入包：

import { CommonModule } from "@angular/common";

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