Angular Material custom datepicker format throws error “format.replace is not a function”

问题

I am working on customising the date to the dd-mmm-yyy ie for eg 12-Feb-2019, working using the angular material 6 and this is my code, I have not used a replace function but yet get this error

The component file content

 import { MomentDateAdapter ,MatMomentDateModule } from '@angular/material-moment-adapter';
    import {DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE} from '@angular/material/core';
    import {MatDatepicker} from '@angular/material/datepicker';
    import {default as _rollupMoment, Moment} from 'moment';
    import * as _moment from 'moment';
export class MyDateAdapter extends NativeDateAdapter {
    // constructor() {
    //  super('en-US');
    // }

    format(date: Date, displayFormat: Object): string {
        if (displayFormat == "input") {
            let day = date.getDate();
            let month = date.getMonth() + 1;
            let year = date.getFullYear();
            return this._to2digit(day) + '/' + this._to2digit(month) + '/' + year;
        } else {
            return date.toDateString();
        }
    }

    private _to2digit(n: number) {
        return ('00' + n).slice(-2);
    } 


 }
    export const MY_FORMATS = {
        parse: {
          dateInput: 'LL',
        },
        display: {
            // dateInput: { month: 'short', year: 'numeric', day: 'numeric' },
            dateInput: 'input',
            monthYearLabel: {year: 'numeric', month: 'short'},
            dateA11yLabel: {year: 'numeric', month: 'long', day: 'numeric'},
            monthYearA11yLabel: {year: 'numeric', month: 'long'},
        }
      };

And the HTML part

<div class="col-lg-4 m-form__group-sub">
                                            <mat-form-field class="example-full-width" appearance="outline">
                                                <mat-label>Invoice Date</mat-label>
                                                <input matInput [min]="minDate" [max]="maxDate" [matDatepicker]="picker1" placeholder="Choose a date" formControlName="inv_date">
                                                <mat-datepicker-toggle matSuffix [for]="picker1"></mat-datepicker-toggle>
                                                <mat-datepicker #picker1></mat-datepicker>
                                            </mat-form-field>
                                        </div>

回答1:

To have the UTC material datepicker behavior and specific date format:

Install @angular/material-moment-adapter and make sure moment lib also installed.
Import MatMomentDateModule.
Add { provide: MAT_MOMENT_DATE_ADAPTER_OPTIONS, useValue: { useUtc: true }} to providers array of your module.
Optional. To override the display value in a datepicker, set a locale using: { provide: MAT_DATE_LOCALE, useValue: 'en-GB' } to have globally dd/M/yyyy format visually for the material datepicker

Starting from now, the material datepicker will work with UTC. Output of datepicker will be also UTC without adjustments for a time-zone.

For very advanced cases, go with a custom DateAdapter implementation and DateFormats instead of everything above. {provide: DateAdapter, useClass: MyDateAdapter}, {provide: MAT_DATE_FORMATS, useValue: MY_DATE_FORMATS}

For additional info, look at material API docs

回答2:

In my case, I've checked the file webpack:///./node_modules/@angular/material/esm5/datepicker.es5.js line 1630 and when I received a Moment date object as value, I had format.replace error.

I used the NativeDateAdapter from angular/core on my custom component and the error disappeared (I'm overriding in my app.module with MomentDateAdapter).

In your case, I think you can try to return a replace function from your own format function.

回答3:

just import MatMomentDateModule in the app.module.ts after install angular material

回答4:

Faced the same issue with angular/material 10. Importing MatNativeDateModule solved the issue on my side.

import { MatNativeDateModule } from '@angular/material/core';

来源：https://stackoverflow.com/questions/54867168/angular-material-custom-datepicker-format-throws-error-format-replace-is-not-a

标签

angular6

date-format

angular-material-6