Angular 2 提交后如何清除表单？

我有一些带有模板的简单 Angular 2 组件。提交后如何清除表单和所有字段？我无法重新加载页面。 设置数据后date.setValue('')场依然touched.

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

@Component({
    selector: 'loading-form',
    templateUrl: 'app/loadings/loading-form.component.html',
    directives: [FORM_DIRECTIVES]
})

export class LoadingFormComponent {
    private form:ControlGroup;
    private date:Control;
    private capacity:Control;

    constructor(private _loadingsService:LoadingsService, fb:FormBuilder) {
        this.date = new Control('', Validators.required);
        this.capacity = new Control('', Validators.required);
        this.form = fb.group({
            'date': this.date,
            'capacity': this.capacity
        });
    }

    onSubmit(value:any):void {
        //send some data to backend
    }
}

加载表单.component.html

<div class="card card-block">
    <h3 class="card-title">Loading form</h3>

    <form (ngSubmit)="onSubmit(form.value)" [ngFormModel]="form">
        <fieldset class="form-group" [class.has-danger]="!date.valid && date.touched">
            <label class="form-control-label" for="dateInput">Date</label>
            <input type="text" class="form-control form-control-danger form-control-success" id="dateInput"
                   min="0" placeholder="Enter loading date"
                   [ngFormControl]="form.controls['date']">
        </fieldset>
        <fieldset class="form-group" [class.has-danger]="!capacity.valid && capacity.touched">
            <label class="form-control-label" for="capacityInput">Capacity</label>
            <input type="number" class="form-control form-control-danger form-control-success" id="capacityInput"
                   placeholder="Enter capacity"
                   [ngFormControl]="form.controls['capacity']">
        </fieldset>
        <button type="submit" class="btn btn-primary" [disabled]="!form.valid">Submit
        </button>
    </form>
</div>

也可以看看https://angular.io/docs/ts/latest/guide/reactive-forms.html https://angular.io/docs/ts/latest/guide/reactive-forms.html（“重置表单标志”部分）

>=RC.6

RC.6中应该支持更新表单模型。创建一个新的表单组并分配给myForm

[formGroup]="myForm"

也将得到支持（https://github.com/angular/angular/pull/11051#issuecomment-243483654 https://github.com/angular/angular/pull/11051#issuecomment-243483654)

>=RC.5

form.reset();

在新的表单模块中（>= RC.5）NgForm has a reset()方法，还支持表单reset event. https://github.com/angular/angular/blob/6fd5bc075d70879c487c0188f6cd5b148e72a4dd/modules/%40angular/forms/src/directives/ng_form.ts#L179 https://github.com/angular/angular/blob/6fd5bc075d70879c487c0188f6cd5b148e72a4dd/modules/%40angular/forms/src/directives/ng_form.ts#L179

这将起作用：

onSubmit(value:any):void {
  //send some data to backend
  for(var name in form.controls) {
    (<Control>form.controls[name]).updateValue('');
    /*(<FormControl>form.controls[name]).updateValue('');*/ this should work in RC4 if `Control` is not working, working same in my case
    form.controls[name].setErrors(null);
  }
}

也可以看看

• https://github.com/angular/angular/issues/6196 https://github.com/angular/angular/issues/6196
• https://github.com/angular/angular/issues/6169 https://github.com/angular/angular/issues/6169
• https://github.com/angular/angular/issues/4933 https://github.com/angular/angular/issues/4933
• https://github.com/angular/angular/issues/4914 https://github.com/angular/angular/issues/4914
• https://github.com/angular/angular/issues/6371 https://github.com/angular/angular/issues/6371