What is the best way to modify the NgbDatePicker format in Angular 4 from YYYY-MM-DD to MM-DD-YYYY?

Hello, I am currently using ngbDatePicker with a format of YYYY-MM-DD and I have been trying to change it to MM/DD/YYYY without success.

Here is the HTML code:

    <div class="form-group datepicker">
      <label for="dob">Date of Birth*</label>
      <div class="row input-group">
        <input
          ngbDatepicker
          #d="ngbDatepicker"
          #dobF="ngModel"
          class="form-control input-underline input-lg"
          id="dob"
          [(ngModel)]="dateOfBirth"
          placeholder="mm-dd-yyyy"
          name="dp"
          [ngClass]="{
            invalid:
              (dobF.value === null || isString(dobF.value) || futureDate) && dobF.touched
          }"
          required
        />
        <div class="input-group-append">
          <button
            class="btn btn-outline-secondary calendar"
            (click)="d.toggle()"
            type="button"
          ></button>
        </div>
      </div>
      <div
        *ngIf="
          (dobF.value === null || isString(dobF.value)  || futureDate) && dobF.touched
        "
        class="error"
      >
        Please enter a valid date of birth.
      </div>
    </div>

Here is the TypeScript file code:

  public dateOfBirth: { year: number; month: number; day: number };

  public currentDate = moment().format("YYYY-MM-DD");

constructor(
private config: NgbDatepickerConfig
 ) {
// customize default values of datepickers used by this component tree
const currentDate = new Date();
  const day = currentDate.getDate();
   const month = currentDate.getMonth() + 1;
  const year = currentDate.getFullYear();

 this.config.minDate = {year: 1900, month: 1, day: 1};
 this.config.maxDate = {year, month, day};

 this.config.outsideDays = "hidden";
}

ngOninit() {

  this.subscriptions["patient"] = this.store
   .select("patient")
   .subscribe(data => {
    this.patient = Object.assign({}, this.patient, data);
    const dob = this.patient.Dob ? this.patient.Dob.split("-") : null;
    dob !== null
      ? (this.dateOfBirth = {
        year: Number(dob[0]),
        month: Number(dob[1]),
        day: Number(dob[2])
      })
      : (this.dateOfBirth = null);
  });
 }

ngAfterContentChecked() {
let currentDateObject = this.currentDate.split("-");
this.dobYear = Number(currentDateObject[0]);
this.dobMonth = Number(currentDateObject[1]);
this.dobDay = Number(currentDateObject[2]);
if (this.dateOfBirth) {
  this.futureDate = this.dateOfBirth.year > this.dobYear || (this.dateOfBirth.year == this.dobYear && this.dateOfBirth.month > this.dobMonth)
    || (this.dateOfBirth.year == this.dobYear && this.dateOfBirth.month == this.dobMonth && this.dateOfBirth.day > this.dobDay);
    }
  }

I have been unable to find any resources on how to change the format from YYYY/MM/DD to MM/DD/YYYY. Any help would be greatly appreciated. Thank you.

Answer №1

To customize the date format in your Angular application, you can create a custom parser formatter by extending NgbDateParserFormatter:

Here is an example for converting dates from dd/mm/yyyy to mm/dd/yyyy format. Simply adjust the parse() and format() functions accordingly:

Define the following class:

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

@Injectable()
export class NgbDateCustomParserFormatter extends NgbDateParserFormatter {
  parse(value: string): NgbDateStruct {
    // Implementation for parsing the input value
  }

  format(date: NgbDateStruct): string {
    // Implementation for formatting the date object
  }
}
// Helper functions for parsing and formatting

Update app.module.ts to use the custom provider:

import { NgbDateCustomParserFormatter } from "./YOURPATH/date-formatter.service";

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...
  ],
  providers: [
    ... , 
    { provide: NgbDateParserFormatter, useClass: NgbDateCustomParserFormatter }  // <-- Add this line
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}

Answer №2

To achieve the desired outcome, it is necessary to modify the file provided below. I have made adjustments to the code to ensure that the input field displays the date in the required format (DD-MM-YYYY).

ngb-date-parser-formatter.js

By applying the code below, you will obtain the DD-MM-YYYY Date format in the input field.

var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { padNumber, toInteger, isNumber } from '../util/util';
/**
 * Abstract type serving as a DI token for the service parsing and formatting dates for the NgbInputDatepicker
 * directive. A default implementation using the ISO 8601 format is provided, but you can provide another implementation
 * to use an alternative format.
 */
var NgbDateParserFormatter = (function () {
    function NgbDateParserFormatter() {
    }
    return NgbDateParserFormatter;
}());
export { NgbDateParserFormatter };
var NgbDateISOParserFormatter = (function (_super) {
    __extends(NgbDateISOParserFormatter, _super);
    function NgbDateISOParserFormatter() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    NgbDateISOParserFormatter.prototype.parse = function (value) {
        if (value) {
            var dateParts = value.trim().split('-');
            if (dateParts.length === 1 && isNumber(dateParts[0])) {
                return { year: toInteger(dateParts[0]), month: null, day: null };
            }
            else if (dateParts.length === 2 && isNumber(dateParts[0]) && isNumber(dateParts[1])) {
                return { year: toInteger(dateParts[0]), month: toInteger(dateParts[1]), day: null };
            }
            else if (dateParts.length === 3 && isNumber(dateParts[0]) && isNumber(dateParts[1]) && isNumber(dateParts[2])) {
                return { year: toInteger(dateParts[0]), month: toInteger(dateParts[1]), day: toInteger(dateParts[2]) };
            }
        }
        return null;
    };
    NgbDateISOParserFormatter.prototype.format = function (date) {
        return date ?
        (isNumber(date.day) ? padNumber(date.day) : '')+"-"+ (isNumber(date.month) ? padNumber(date.month) : '') +"-"+ date.year:'';
    };
    return NgbDateISOParserFormatter;
}(NgbDateParserFormatter));
export { NgbDateISOParserFormatter };
//# sourceMappingURL=ngb-date-parser-formatter.js.map

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Prepending the emulated prefix to Angular 6-7 ViewEncapsulation

Can we customize the tags generated when using ViewEncapsulation.Emulated in an Angular 2-7 component? Currently, it generates tags like [_ngContent-C0], but is there a way to add a custom string to the generated tag, such as [_ngContent-C0-myApp]? Thank ...

Execute a function multiple times within a loop

My task involves passing objects from an array to a function one at a time with a 1-second pause in between each item: async function CallingLabels() { if(id) { if(LabelNumbers) { LabelNumbers.forEach(async (Label) => { await ...

Utilize Javascript to extract and showcase JSON data fetched from a RESTful API

I'm attempting to use JavaScript to pull JSON data from a REST API and display it on a webpage. The REST call is functioning correctly in the Firefox console. function gethosts() { var xhttp = new XMLHttpRequest(); xhttp.open("GET", "https://10 ...

ng-map vm.positions fail to refresh

I am currently utilizing the ng-map directive in conjunction with AngularJS. I have implemented the code below to generate markers. I store latitude and longitude values for each marker in an array, much like the examples shown here. Upon inspecting the lo ...

Issues with grunt - Alert: Task "ngAnnotate:dist" has encountered an error. Proceed using --force option

Encountering an unexpected issue with a Grunt task that previously ran smoothly. The error message is as follows: Running "ngAnnotate:dist" (ngAnnotate) task Generating ".tmp/concat/scripts/scripts.js" from: ".tmp/concat/scripts/scripts.js"...ERROR >& ...

Using Vue 2 with Webpack works seamlessly for one application but encounters issues when used for another

I've been struggling with this problem for days now. I'm working on a project that consists of two single-page Vue applications or a two-page application as some might call it. These apps have common functionalities which have been extracted into ...

Node - A circular @import reference has been detected

Recently, I've dived into the world of JavaScript, node.js, and related technologies. My goal is to create a front-end development environment from scratch using tools like gulp, bower, browser sync, and various plugins. I've made significant pr ...

Inferring types in a generic function with multiple parameters

In my attempt to configure a generic with the parameter serving as the key of another object, I have found success using extends keyof when both types are provided as parameters to the function. However, I encountered an issue when the type that provides ...

Adjust the background color using jQuery to its original hue

While working on a webpage, I am implementing a menu that changes its background color upon being clicked using jQuery. Currently, my focus is on refining the functionality of the menu itself. However, I've encountered an issue - once I click on a men ...

Execute a grandchild function in Angular that triggers its grandparent function

I'm currently working with a component structure that looks like this: Component A -> Component B -> Component C Within the template of Component C, there is a button that triggers a function in the 'code behind' when clicked. My go ...

Waiting for an API call to complete before loading a specific path in REACT - how can this be achieved?

When using the axios post to request access to the application from the backend, the issue arises when axios returns undefined and then true or false. This leads to a problem in managing the private Route based on these responses. The question is, is axi ...

Automatically update button appearance upon reaching zero value using JavaScript

Whenever I click the button, the user's HP decreases until it reaches 0 and then the button changes. However, a peculiar issue arises when the userHealth hits zero - the button does not change immediately. An additional click is required for the butto ...

Leveraging JavaScript Variables with Android Development

How can I extract a JavaScript variable from a website and incorporate it into my code? I followed the steps in this guide to display the string in an alert message, but now I'm unsure how to use it outside of the alert. Any advice would be appreciate ...

Techniques for triggering JavaScript on elements that have been dynamically loaded via Ajax

When it comes to ensuring that a certain functionality works both when the document is ready and after an Ajax call, there are some considerations to keep in mind for optimal performance. An approach I found effective involves defining the desired code wi ...

Error message stating that the callback function was not triggered by the injected JSONP script in Angular

Currently, I am running an application on localhost://3000 using npm server. Here is the content of my services file: import {Injectable} from "@angular/core"; import {Jsonp} from "@angular/http"; import 'rxjs/add/operator/map'; @Injectable() ...

Displaying search results seamlessly on the same page without any need for reloading

I am looking to create a search engine that displays results without the need to refresh the page. I have come across using hash as a potential solution, but I don't have much knowledge about web programming. So far, with the help of tutorials, I have ...

Streaming large files with Node.js can lead to significant memory consumption and potential memory errors like OOM

My current project involves using node.js to download large files (300MB) from a server and then piping the response to a file write stream. While I have a good understanding of how pipes work in Node.js, I am encountering an issue where the memory usage o ...

Guide to placing the Drawer component beneath the AppBar in Material-UI

Exploring the capabilities of the Material UI drawer component, I'm looking to position the drawer below the appbar. My goal is to have the hamburger icon toggle the drawer open and closed when clicked: opening the drawer downwards without moving the ...

Angular 12 - Clicking on a tab that is already selected in mat-tab-link does not refresh the page

In my application, there is a navigation bar with multiple mat-tab-link elements. Each link corresponds to a specific page and clicking on it should load that page. However, I've noticed that clicking on a link that is already focused does not trigger ...

The absence of the 'profileStore' property is noticed in the '{}' type, which is necessary in the 'Readonly<AppProps>' type according to TypeScript error code ts(2741)

I'm currently using MobX React with TypeScript Why am I getting an error with <MainNote/>? Do I just need to set default props? https://i.stack.imgur.com/5L5bq.png The error message states: Property 'profileStore' is missing in typ ...