angular - 自 Angular/Material 从 5 升级到 6 以来，自定义 native 日期适配器不再起作用

Question

我的 Angular 5 应用程序中有一个自定义日期适配器:

import {NativeDateAdapter} from "@angular/material";
import {Injectable} from "@angular/core";

@Injectable()
export class CustomDateAdapter extends NativeDateAdapter {

    parse(value: any): Date | null {
        if ((typeof value === 'string') && (value.indexOf('/') > -1)) {
            const str = value.split('/');
            return new Date(Number(str[2]), Number(str[1])-1, Number(str[0]), 12);
        }
        const timestamp = typeof value === 'number' ? value : Date.parse(value);
        return isNaN(timestamp) ? null : new Date(timestamp);
    }

    format(date: Date, displayFormat: Object): string {
        return date.getFullYear() + "-" + (date.getMonth() + 1).toString().padStart(2, '0') + "-" + date.getDate().toString().padStart(2, '0');
    }

}

在app.module.ts中定义

@NgModule({
    imports: [...],
    declarations: [...],
    providers: [
        ...,
        { provide: DateAdapter, useClass: CustomDateAdapter }
    ],
    bootstrap: [
        AppComponent
    ]
})
export class AppModule {}

它工作得很好，但是当将 Angular/Material 升级到版本 6 时它停止了。这是我现在遇到的错误:

ERROR TypeError: Cannot read property 'TRIDENT' of undefined
    at new NativeDateAdapter (native-date-adapter.ts:83)
    at new CustomDateAdapter (custom.date.adapter.ts:5)
    at _createClass (ng_module.ts:171)
    at _createProviderInstance$1 (ng_module.ts:143)
    at resolveNgModuleDep (ng_module.ts:104)
    at NgModuleRef_.get (refs.ts:502)
    at resolveDep (provider.ts:416)
    at createClass (provider.ts:276)
    at createDirectiveInstance (provider.ts:135)
    at createViewNodes (view.ts:303)

我遇到了类似的问题CustomeDateAdapter in Angular Material 6并尝试了推荐的修复，包括构造函数

constructor(matDateLocale: string) {
    super(matDateLocale, new Platform());
}

现在它会产生以下错误:

ERROR Error: StaticInjectorError(AppModule)[DateAdapter -> String]: 
  StaticInjectorError(Platform: core)[DateAdapter -> String]: 
    NullInjectorError: No provider for String!
    at NullInjector.get (injector.ts:35)
    at resolveToken (injector.ts:332)
    at tryResolveToken (injector.ts:274)
    at StaticInjector.get (injector.ts:154)
    at resolveToken (injector.ts:332)
    at tryResolveToken (injector.ts:274)
    at StaticInjector.get (injector.ts:154)
    at resolveNgModuleDep (ng_module.ts:124)
    at _createClass (ng_module.ts:173)
    at _createProviderInstance$1 (ng_module.ts:143)

知道如何让它再次工作吗？

Answer 1

我使用 MomentDateAdapter 和自定义日期格式解决了这个问题。

import {NgModule} from "@angular/core";
import {AppComponent} from "./app.component";
import {DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE} from "@angular/material";
import {MomentModule} from "ngx-moment";
import {MomentDateAdapter} from '@angular/material-moment-adapter';

export const ISO_FORMAT = {
    parse: {
        dateInput: 'LL',
    },
    display: {
        dateInput: 'YYYY-MM-DD',
        monthYearLabel: 'MMM YYYY',
        dateA11yLabel: 'LL',
        monthYearA11yLabel: 'MMMM YYYY',
    },
};

@NgModule({
    imports: [
        MomentModule,
        ...
    ],
    declarations: [
        AppComponent,
        ...
    ],
    providers: [
        {provide: DateAdapter, useClass: MomentDateAdapter, deps: [MAT_DATE_LOCALE]},
        {provide: MAT_DATE_FORMATS, useValue: ISO_FORMAT},
        ...
    ],
    bootstrap: [
        AppComponent
    ]
})

export class AppModule {}