材料成分波斯日期选择器角度为2

Question

Angular2 Material Component有一个DatePicker,以默认格式显示日期.

并且仅支持"fa-IR"本地更改.

如何格式化以显示波斯日期？

Answer 1

以下步骤应该有所帮助:

1:在module.ts中加载所有必需的模块:

import { MatDatepickerModule, NativeDateAdapter, DateAdapter, MAT_DATE_FORMATS,MAT_DATE_LOCALE} from '@angular/material';

2:使用NPM安装jalali-moment:

 npm install jalali-moment

3:将jalali日期导入您的应用:

import * as moment from 'jalali-moment';

如果使用system.js,则必须在system.config.js中声明它以运行app

4:编写自定义类以覆盖默认日期格式机制

export class CustomDateAdapter extends NativeDateAdapter {
  constructor(matDateLocale: string) {
    super(matDateLocale, new Platform());
  }
  format(date: Date, displayFormat: object): string {
    var faDate = moment(date.toDateString()).locale('fa').format('YYYY/MM/DD');
    return faDate;
  }
}

5:编写一个定义自定义日期格式的常量

const MY_DATE_FORMATS = {
  parse: {
    dateInput: { month: 'short', year: 'numeric', day: 'numeric' }
  },
  display: {
    dateInput: 'input',
    monthYearLabel: { year: 'numeric', month: 'short' },
    dateA11yLabel: { year: 'numeric', month: 'long', day: 'numeric' },
    monthYearA11yLabel: { year: 'numeric', month: 'long' }
  }
}

6:MatDatepickerModule必须加入你的@NgModule.编辑您的提供商部分,@NgModule向您的应用介绍添加的课程:

@NgModule({
  imports: [
    MatDatepickerModule,
  ],
  providers: [
    { provide: MAT_DATE_LOCALE, useValue: 'fa-IR' },
    { provide: DateAdapter, useClass: CustomDateAdapter, deps: [MAT_DATE_LOCALE] },
    { provide: MAT_DATE_FORMATS, useValue: MY_DATE_FORMATS }
  ],
})

7:将日期选择器添加到您的html页面:

<mat-form-field>
  <input #dateInput matInput [matDatepicker]="picker" [(ngModel)]="date" (change)="dateChange($event,dateInput,picker)" placeholder="?????? ?????">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

8:当用户手动更改日期输入时,还要正确地弹出显示日期,你必须将下面的代码和方法添加到ts文件中,你将你的datepicker控件放到它的html文件或模板中

添加以下mothod来处理输入更改事件

 public dateChange(event: any, dateInput: any,picker:any) {
    var faDate = dateInput.value;
    moment.locale('fa');
    var enDateMomentFormat  = moment(faDate).locale('en');
    var enDate = new Date(enDateMomentFormat.toLocaleString());
    picker._validSelected = enDate;
    picker.startAt = enDate;
}

由于datepicker显示的日期有问题,我强制编辑material.umd.js来纠正它.在地址:node_modules/@angular/material/bundles/material.umd.js在行:10947 <==>你也可以搜索"MatMonthView.prototype._createWeekCells ="编辑结束行的功能如下

let displayValue = ariaLabel.split('/')[2];
this._weeks[this._weeks.length - 1]
    .push(new MatCalendarCell(i + 1, Number(displayValue), ariaLabel, enabled));