【问题标题】：How to initialize an Angular Material Datepicker input form field?如何初始化 Angular Material Datepicker 输入表单域？
【发布时间】：2019-12-01 18:11:47
【问题描述】：

我正在尝试格式化我的日期选择器。我不知道路。我尝试插入一个我不知道如何使用但从 Internet 复制的 moment.js 库。现在我的日期选择器返回一个对象时刻，我不知道如何格式化它。

组件

this.form = this.fb.group({
  deliveryDate: [this.deliveryDate], // i try to set here instead this.delieryDate null or moment() or everythink.....
  address: [null, [Validators.required, Validators.minLength(5)]],
  phone: [null, [Validators.minLength(9),Validators.maxLength(19)]],
  city: [null, [Validators.required, Validators.minLength(5)]],
  data: this.fb.array([this.createContact()])
});

模板

<mat-form-field>
  <input matInput [matDatepicker]="picker" placeholder="Izaberite datum narudzbe"
      formControlName="deliveryDate">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

【问题讨论】：

标签： angular datepicker angular-material

【解决方案1】：

为Angular Material Datepicker 设置初始日期的最简单方法是在构造表单控件时设置初始日期值。

组件

import {Component} from '@angular/core';
import {FormBuilder, FormControl, Validators} from '@angular/forms';

@Component({
  selector: 'app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  deliveryForm = this.fb.group({
    deliveryDate: [new Date()],
    address: [null, [Validators.required, Validators.minLength(5)]],
    phone: [null, [Validators.minLength(9),Validators.maxLength(19)]],
    city: [null, [Validators.required, Validators.minLength(5)]]
  });

  constructor(private fb: FormBuilder) { }
}

HTML 模板

<form [formGroup]="deliveryForm">
  <mat-form-field>
    <input matInput [matDatepicker]="picker" placeholder="Izaberite datum narudzbe"
         formControlName="deliveryDate">
    <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
    <mat-datepicker #picker></mat-datepicker>
  </mat-form-field>

  <mat-form-field>
    <input matInput formControlName="address" placeholder="Address"
      autocomplete="address-line1">
  </mat-form-field>

  <mat-form-field>
    <input matInput formControlName="phone" placeholder="Phone number"
      autocomplete="tel-national">
  </mat-form-field>

  <mat-form-field>
    <input matInput formControlName="city" placeholder="City" autocomplete="address-level2">
  </mat-form-field>
</form>

结果表格

【讨论】：