Changing the ngbDatepicker input template

user_2404112 0
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I'm working on an app that's using this example:

https://stackblitz.com/angular/rynxmynlykl

What I want is to display the selected date in a different format. Instead of yyyy-mm-dd, I want mm/dd/yyyy. The placeholder is easy enough to change but I'm having trouble finding what I'm looking for in the docs (https://ng-bootstrap.github.io/#/components/datepicker/api).

The ngModel accepts an object which contains year, month, and day. Datepicker then formats it to the above format.

The closest answer I found is here but is now out of date (How to change model structure of angular powered bootstrap ngbDatepicker).

Has anyone run across this scenario before?

ng-bootstrap angular
1 Answers

As mentioned in the DatePicker documentation, you can provide a custom version of the NgbDateParserFormatter. See this stackblitz for a demo.

The following code for the parser/formatter is adapted from this GitHubGist by Niels Robin-Aubertin:

import { Injectable } from "@angular/core";
import { NgbDateParserFormatter, NgbDateStruct } from "@ng-bootstrap/ng-bootstrap";

@Injectable()
export class CustomDateParserFormatter extends NgbDateParserFormatter {

  parse(value: string): NgbDateStruct {
    if (value) {
      const dateParts = value.trim().split('/');
      if (dateParts.length === 1 && this.isNumber(dateParts[0])) {
        return { year: this.toInteger(dateParts[0]), month: null, day: null };
      } else if (dateParts.length === 2 && this.isNumber(dateParts[0]) && this.isNumber(dateParts[1])) {
        return { year: this.toInteger(dateParts[1]), month: this.toInteger(dateParts[0]), day: null };
      } else if (dateParts.length === 3 && this.isNumber(dateParts[0]) && this.isNumber(dateParts[1]) && this.isNumber(dateParts[2])) {
        return { year: this.toInteger(dateParts[2]), month: this.toInteger(dateParts[0]), day: this.toInteger(dateParts[1]) };
      }
    }
    return null;
  }

  format(date: NgbDateStruct): string {
    let stringDate: string = "";
    if (date) {
      stringDate += this.isNumber(date.month) ? this.padNumber(date.month) + "/" : "";
      stringDate += this.isNumber(date.day) ? this.padNumber(date.day) + "/" : "";
      stringDate += date.year;
    }
    return stringDate;
  }

  private padNumber(value: number) {
    if (this.isNumber(value)) {
      return `0${value}`.slice(-2);
    } else {
      return "";
    }
  }

  private isNumber(value: any): boolean {
    return !isNaN(this.toInteger(value));
  }

  private toInteger(value: any): number {
    return parseInt(`${value}`, 10);
  }
}

The date parser/formatter is added to the providers in the module:

import { NgbDateParserFormatter, ... } from '@ng-bootstrap/ng-bootstrap';
import { CustomDateParserFormatter } from "./datepicker-formatter";

@NgModule({
  ...
  providers: [{ provide: NgbDateParserFormatter, useClass: CustomDateParserFormatter }]
})
export class AppModule { }
user_10099220
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