Question

使用带表单的ngFormModel指令时遇到了一些问题它说“TypeError：无法在form_one中读取未定义的属性'验证者'（我从NG-BOOK 2教程编写此代码但它不起作用！）

import {Component} from 'angular2/core'
import {
  FORM_DIRECTIVES,
  FormBuilder,
  ControlGroup,
  Validators
} from 'angular2/common'

@Component({
  selector: 'demo-form-sku-builder',
  directives: [FORM_DIRECTIVES],
  template: `
  <div class="ui raised segment">
    <h2 class="ui header">Demo Form: Sku with FormBuilder</h2>
    <form class="ui form"
      [ngFormModel]="myForm"
      (ngSubmit)="onSubmit(myForm.value)">
      <div class="field">
        <label for="skuInput">SKU</label>
        <input type="text"
          id="skuInput"
          placeholder="SKU"
          [ngFormControl]="myForm.controls['sku']">
      </div>

      <button type="submit" class="ui button">Submit</button>
    </form>
  </div>
  `
})
export class DemoFormSkuBuilder {

  contructor (formBuilder) {
      this.myForm = formBuilder.group({
        'sku': ['', Validators.required]
      })
  }

  onSubmit(value) {
    console.log("you submitted value: ", value);
  }
}

编辑：（@ Thierry Templier）

contructor (formBuilder) {
    this.fb = formBuilder;
    this.myForm = this.fb.group({
      'sku': ['', Validators.required]
    })
  }

  static get parameters() {
    return [[FormBuilder]];
  }

我的图书馆：

import 'es6-shim';
import 'reflect-metadata';
import 'zone.js/dist/zone-microtask'
import 'rxjs/Rx'
import 'es6-promise'

Answer 1

您需要在组件中定义表单控件：

import {FormBuilder} from 'angular2/common';

@Component({
  (...)
})
export class DemoFormSkuBuilder {
  contructor (private fb:FormBuilder) {
    this.form_one = this.fb.group({
      (...)
    });
  }
}

您可以查看本文以获取更多详细信息，请参阅＆＃34;使用现有控件＆＃34;

部分

实现Angular2表单超越基础 - http://restlet.com/blog/2016/02/11/implementing-angular2-forms-beyond-basics-part-1/

修改

如果要在ES6中注入，则需要定义静态getter参数：

import {FormBuilder} from 'angular2/common'; @Component({ (...) }) export class DemoFormSkuBuilder { contructor (fb) { this.fb = fb; this.form_one = this.fb.group({ (...) }); } static get parameters() { return [[FormBuilder]]; } }

这是一个描述这种方法的工作人员：https://plnkr.co/edit/ymSUUCvG5NFvmCGqzj2r?p=preview。

看到这个问题：

How to Inject Angular2 Http service into es6/7 Class?

使用ngFormModel（ES6）时，angular2无法读取未定义的属性'validator'

1 个答案: