如何在运行时更改Angular Material Datepicker格式 [英] How to change Angular Material Datepicker format in run-time
问题描述
我正在使用具有 Material 设计的 Angular 应用程序,并且正在使用 Moment.js 来解析和格式化日期.
I'm working on an Angular App with Material Design, and I'm using Moment.js to parse and format dates.
在我的其中一个页面中,我有一个材料的日期选择器.我已经按照材料的指导方针使Datepicker与moment
对象一起工作,而不是在本机Date
对象上工作.
In one of my pages I have a Material's Datepicker. I have followed the material's guide-lines to make the Datepicker work with moment
object - instead on the native Date
object.
我也设法以某种格式在日期选择器中显示日期.但是,此格式在组件的提供程序中进行了硬编码. 如何根据用户偏好在运行时更改格式?
Also I managed to display the Date in the Datepicker in a certain format. But this format in hard coded in the Component's providers. How can I change the format during run-time, according to the user preferences?
我已经安装了npm的软件包:
I've installed npm's packages:
$ npm i moment -S
$ npm i @angular/material-moment-adapter -S
// app.module.ts
import { MatMomentDateModule } from '@angular/material-moment-adapter'
...
@NgModule({
imports: [
MatMomentDateModule,
...
// demo.component.ts
import * as moment from 'moment';
import { MAT_DATE_FORMATS } from '@angular/material/core';
const MY_FORMATS = {
parse: {
dateInput: 'LL',
},
display: {
dateInput: 'LL',
monthYearLabel: 'MMM YYYY',
dateA11yLabel: 'LL',
monthYearA11yLabel: 'MMMM YYYY',
},
};
@Component({
selector: 'app-demo',
templateUrl: './demo.component.html',
styleUrls: ['./demo.component.scss'],
providers: [
{ provide: MAT_DATE_FORMATS, useValue: MY_FORMATS },
],
})
export class DemoComponent {
public dateVal = moment();
}
// demo.component.html
<mat-form-field>
<input matInput [matDatepicker]="myDatePicker" [(ngModel)]="dateVal">
<mat-datepicker-toggle matSuffix [for]="myDatePicker"></mat-datepicker-toggle>
<mat-datepicker #myDatePicker></mat-datepicker>
</mat-form-field>
如您所见,日期格式是在组件的提供程序中定义的.如何在运行时更改它?
As you can see, the date-format is defined in the Component's providers. How can I change this in run-time?
可以在此处找到一个工作示例:
https://stackblitz.com/angular/mgaargebgpd?file=app %2Fdatepicker-formats-example.ts
A working example could be found here:
https://stackblitz.com/angular/mgaargebgpd?file=app%2Fdatepicker-formats-example.ts
推荐答案
好,所以我终于找到了一种在运行时更改mat-date-picker
格式的方法(文档完全没有帮助).
OK, so I finally find a way to change the mat-date-picker
format during run-time (the documentation didn't help at all).
您可能已经有这样的服务,如果没有,则应创建一个服务,以便可以将日期格式控制在一个位置.
You probable already have a service like this, if no you should create one, so you could control the date-formatting in one place.
// date-time.service
import { Injectable } from '@angular/core';
import * as moment from 'moment';
@Injectable({ providedIn: 'root' })
export class DateTimeService
{
public getFormat(): string
{
return "DD-MM-YYYY"; // add you own logic here
}
public getLocale(): string
{
return "he-IL"; // add you own logic here
}
}
步骤2-创建一个 CustomDateAdapter ,它将负责在运行时解析日期
Step #2 - Create a CustomDateAdapter, that will be responsible for parsing the date during run-time
// customDateAdapter.ts
import { Injectable } from '@angular/core';
import { MomentDateAdapter } from '@angular/material-moment-adapter';
import * as moment from 'moment';
import { DateTimeService } from './date-time.service';
@Injectable()
export class CustomDateAdapter extends MomentDateAdapter
{
constructor(private _dateTimeService: DateTimeService)
{
super('en-US'); // set default locale
}
public format(date: moment.Moment, displayFormat: string): string
{
const locale = this._dateTimeService.getLocale();
const format = this._dateTimeService.getFormat();
return date.locale(locale).format(format);
}
}
请注意:" CustomDateAdapter "是常规类,而不是组件.尽管我们正在为该课程注入服务.为此,我们需要将@Injectable()
装饰器添加到"CustomDateAdapter"中,并在app.module.ts
中进行一些灯光更改.
Please Notice: That "CustomDateAdapter" is a regular class, and not a component. Although we are injecting a service to this class. To achieve this we need to add the @Injectable()
decorator to the "CustomDateAdapter", and make some light changes in the app.module.ts
.
// app.module.ts
import { DateAdapter, MatNativeDateModule } from '@angular/material';
import { MatMomentDateModule } from '@angular/material-moment-adapter'
import { CustomDateAdapter } from './<some-path>/customDateAdapter';
@NgModule({
imports:
[
MatNativeDateModule,
MatMomentDateModule
],
providers:
[
CustomDateAdapter, // so we could inject services to 'CustomDateAdapter'
{ provide: DateAdapter, useClass: CustomDateAdapter }, // Parse MatDatePicker Format
]
})
export class AppModule { /* ... */ }
P.S
请注意,问题中的代码(来自"demo.component.ts")不再相关.
P.S
Please notice that the code from the question (from the "demo.component.ts") isn't relevant any more.
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