angularjs – 角度2动态嵌套形式

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基本上我想创建一个嵌套对象的动态表单,如下图所示:

>付款在模型上的数组中
>我们应该能够根据需要添加/删除支付.
>表单应该同步底层的表单控件和模型
>支付的数量是任意的,应该从模型加载到表单中

在Angular 2中,没有可以找到如何做到这一点的工作实例,尽管这在Angular 1中真的很容易做到.

以下是我的原始问题,我已经更新了解以澄清(见上文):

首先,我只想指出,我知道Angular 2 rc.2的新版本刚刚在几天前发布.因此,创建动态嵌套表单的代码可能已经更改了一些,但没有足够的文档来证明这一点.

在Angular 2的最新版本中(我目前正在使用rc.1,但计划更新到rc.2),我需要创建一个这样的表单(伪代码):

<form [ngFormModel]="form" (ngSubmit)="onSubmit()">
  <input type="text" ngControl="name">

  <div *ngFor="let expense for expenses; let i = index;" control-group="expenses">
    <input type="text" ngControl="expense.amount" [(ngModel)]="myModel.expenses[i].amount"> 
    <input type="checkBox" ngControl="expense.final" [(ngModel)]="myModel.expenses[i].final"> 
  </div>

  <a class="button" (click)="addExpenseControl()">Add</a>
  <a class="button" (click)="deleteExpenseControl()">Delete</a>
</form>

所以上面的伪代码不行,但老实说由于缺乏文档,我无法弄清楚如何连线这样的东西.有一些关于嵌套ControlGroup的教程,但是这不符合这种情况,因为我们需要能够动态添加删除控制组,并且我还需要能够与模型进行同步.

我发现这个plunkr这里由Angular团队提供,它允许将控件添加到窗体中 – 但是这不是添加/删除ControlGroup,而是使用ControlArray,我不知道这是否适用于此?

我非常熟悉使用更新的基于模型的Angular 2形式,但是我正在抓住资源,以便正确嵌套它们(动态地),并将这个嵌套数据绑定到主窗体模型中.在视图中如何引用嵌套控件?上面的伪代码是否接近?我会发布我的控制器的代码,但老实说,我不知道从哪里开始嵌套费用(ControlGroup?)上面…

我不得不自己解决这个问题,因为在Angular 2中,表单看起来还在变化,我没有看到任何类似的例子(尽管它似乎是一个很常见的用例).

Here is a plunkr工作示例使用Angular2 RC3.

我正在使用从this document更新的Angular 2表单代码.

app.component.ts(包含表单):

import { Component } from '@angular/core';
import {REACTIVE_FORM_DIRECTIVES,FormControl,FormGroup,FormArray} from '@angular/forms';

@Component({
  selector: 'my-app',templateUrl: 'app/app.html',directives: [REACTIVE_FORM_DIRECTIVES],providers:  []
})
export class AppComponent {
  form: FormGroup;
  myModel:any;

  constructor() {
    // initializing a model for the form to keep in sync with. 
    // usually you'd grab this from a backend API
    this.myModel = {
      name: "Joanna Jedrzejczyk",payOffs: [
        {amount: 111.11,date: "Jan 1,2016",final: false},{amount: 222.22,date: "Jan 2,final: true}
        ]
    }

    // initialize form with empty FormArray for payOffs
    this.form = new FormGroup({
      name: new FormControl(''),payOffs: new FormArray([])
    });

    // now we manually use the model and push a FormGroup into the form's FormArray for each PayOff
    this.myModel.payOffs.forEach( 
      (po) => 
        this.form.controls.payOffs.push(this.createPayOffFormGroup(po))
    );
  }

  createPayOffFormGroup(payOffObj) {
    console.log("payOffObj",payOffObj);
    return new FormGroup({
      amount: new FormControl(payOffObj.amount),date: new FormControl(payOffObj.date),final: new FormControl(payOffObj.final)
    });
  }

  addPayOff(event) {
    event.preventDefault(); // ensure this button doesn't try to submit the form
    var emptyPayOff = {amount: null,date: null,final: false};

    // add pay off to both the model and to form controls because I don't think Angular has any way to do this automagically yet
    this.myModel.payOffs.push(emptyPayOff);
    this.form.controls.payOffs.push(this.createPayOffFormGroup(emptyPayOff));
    console.log("Added New Pay Off",this.form.controls.payOffs)
  }

  deletePayOff(index:number) {
    // delete payoff from both the model and the FormArray
    this.myModel.payOffs.splice(index,1);
    this.form.controls.payOffs.removeAt(index);
  }
}

请注意,我手动将新的FormGroup对象推送到Form.Array对象中的form.controls.payOffs数组中.

app.html(包含表单html):

<form (ngSubmit)="onSubmit()" [formGroup]="form">

    <label>Name</label>
    <input type="text" formControlName="name" [(ngModel)]="myModel.name" placeholder="Name">

    <p>Pay Offs</p>
    <table class="simple-table">
      <tr>
        <th>Amount</th>
        <th>Date</th>
        <th>Final?</th>
        <th></th>
      </tr>
    <tbody>
      <tr *ngFor="let po of form.find('payOffs').controls; let i = index">
        <td>
          <input type="text" size=10 [formControl]="po.controls.amount" [(ngModel)]="myModel.payOffs[i].amount">
        </td>
        <td>
          <input type="text" [formControl]="po.controls.date" [(ngModel)]="myModel.payOffs[i].date">
        </td>
        <td>
          <input type="checkBox" [formControl]="po.controls.final" [(ngModel)]="myModel.payOffs[i].final">
        </td>
        <td>
          <button (click)="deletePayOff(i)" style="color: white; background: rgba(255,.5)">x</button>
        </td>
      </tr>
    </tbody>
    <tr>
      <td colspan="4" style="text-align: center; padding: .5em;">
        <button (click)="addPayOff($event)" style="color: white; background: rgba(0,150,1)">Add Pay Off</button>
      </td>
    </tr>
    </table>

  </form>

在html表单中,我将表单链接到输入的模型,如下所示:

... [formControl]="po.controls.amount" [(ngModel)]="myModel.payOffs[i].amount" ...
原文链接:/angularjs/142537.html

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