Angular binding and date validation - a powerful combination!

Question

Angular binding and date validation - a powerful combination!

Facing an issue with date properties in Angular. For instance, here is the Model I am working with:

export class Model{
dateFrom Date;
dateTo Date;
}

In my Create view, I have the following setup:

<input type="date" [(ngModel)] = "model.dateFrom">
<input type="date" [(ngModel)] = "model.dateTo">

<button type="button" (click)="save()"></button>

Within my typescriptFile, there is a function:

public save(){
   if(model.dateFrom > model.dateTo){
          //Display Error Message
   }
}

The issue lies in model.dateFrom and model.dateTo being recognized as strings instead of Dates! I require several date comparisons before sending the data to .net web api. How can I convert string to date? How can I make Angular binding return a date type? What are the best practices for date validations in Angular projects???

I previously used moment.js for date validations in Jquery projects, but seeking advice for Angular project.

Your insights are appreciated!

javascript angular typescript

Answer 1

Answer №1

// Converting a string to a date in JavaScript

new Date('2017-08-24 00:00:00');  // returns true and the date in UTC format
new Date('2017-08-24 00:00');     // returns true and the full date with minutes
new Date('2017-08-24 00');        // returns false as it needs seconds

new Date('2017-08 00:00');        // returns true, setting day to 01
new Date('2017 00:00');           // returns true, setting month and day to January 1

Angular uses Typescript

Typescript is converted into Javascript

So Angular ultimately runs on Javascript

If you need date validations in an Angular project,

Consider using moment.js

Answer 2

// Converting a string to a date in JavaScript

new Date('2017-08-24 00:00:00');  // returns true and the date in UTC format
new Date('2017-08-24 00:00');     // returns true and the full date with minutes
new Date('2017-08-24 00');        // returns false as it needs seconds

new Date('2017-08 00:00');        // returns true, setting day to 01
new Date('2017 00:00');           // returns true, setting month and day to January 1

Angular uses Typescript

Typescript is converted into Javascript

So Angular ultimately runs on Javascript

If you need date validations in an Angular project,

Consider using moment.js

Answer 3

Answer №2

When it comes to handling date formats for APIs, the key factor is understanding what format the API expects. In Javascript, date objects are calculated based on a time value measured in milliseconds since 1 January 1970 UTC. [1]

If you find yourself frequently working with dates and parsing them, I highly recommend utilizing tools like momentjs. Working with dates in JavaScript can often feel like navigating a maze filled with unexpected traps.

Momentjs offers a user-friendly API that simplifies date operations:

let dateA = moment('01/01/2016', 'MM/DD/YYYY');
let dateB = moment('01/01/2017', 'MM/DD/YYYY');
// You can easily perform operations between the variables
dateB.diff(dateA, 'years') // returns 1

Answer 4

When it comes to handling date formats for APIs, the key factor is understanding what format the API expects. In Javascript, date objects are calculated based on a time value measured in milliseconds since 1 January 1970 UTC. [1]

If you find yourself frequently working with dates and parsing them, I highly recommend utilizing tools like momentjs. Working with dates in JavaScript can often feel like navigating a maze filled with unexpected traps.

Momentjs offers a user-friendly API that simplifies date operations:

let dateA = moment('01/01/2016', 'MM/DD/YYYY');
let dateB = moment('01/01/2017', 'MM/DD/YYYY');
// You can easily perform operations between the variables
dateB.diff(dateA, 'years') // returns 1

Angular binding and date validation - a powerful combination!

Answer №1

Answer №2

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