Calculate age from a date

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Calculate age from a date

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1

How can I calculate the age from a date?

This is my code, when I run it I get undefined in the field that I want the age to appear.

<div class="row">
  <div class="small-6 columns">
    <label>Edad</label>
  </div>
  <div class="small-2 columns">
    <input readonly type="text" [value]="CalculateAge()">
  </div>
</div>

import {
  Component,
  OnInit,
  Input
} from '@angular/core';
import {
  DatosDTO
} from '../../dto/datos'

@Component({
  selector: 'app-datos-personales',
  templateUrl: './datos-personales.component.html',
  styleUrls: ['./datos-personales.component.css']
})
export class DatosPersonalesComponent implements OnInit {
  @Input()
  datosDTO: DatosDTO;

  public age: number;

  constructor() {}

  ngOnInit() {
    this.datosDTO = new DatosDTO();
  }
  CalculateAge(): void {
    if (this.datosDTO.datosPersonales.fechaNacimiento) {
      var timeDiff = Math.abs(Date.now() - this.datosDTO.datosPersonales.fechaNacimiento);
      this.age = Math.ceil((timeDiff / (1000 * 3600 * 24)) / 365);
    }
  }
}

export class DatosPersona {
    tipoIdentificacion: string = "";
    numeroIdentificacion: string = "";
    nombres: string = "";
    apellidos: string = "";
    fechaNacimiento: number;
}

typescript angularjs-2.0

asked by EDWARD FABIAN TAPIERO GOMEZ 02.06.2017 в 20:53

source

3 answers

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score 0 · Answer 1

I think the problem is that your CalculateAge() function does not return the age value to be binded to input

A possible correction would be

CalculateAge(): number {
    if (this.datosDTO.datosPersonales.fechaNacimiento) {
        var timeDiff = Math.abs(Date.now() - this.datosDTO.datosPersonales.fechaNacimiento);
        return Math.ceil((timeDiff / (1000 * 3600 * 24)) / 365);
    } else {
        return null;
    }
}

score 0 · Answer 2

You can take your PersonData class and create a calculated variable (a function that is used as a variable) that makes that calculation.

export class DatosPersona {

  tipoIdentificacion: string = "";
  numeroIdentificacion: string = "";
  nombres: string = "";
  apellidos: string = "";
  fechaNacimiento: number;
  get edad(): number {
    return ~~((Date.now() - this.fechaNacimiento || Date.now()) / (24 * 3600 * 365.25 * 1000));
  }

}

Then you can use it like this:

this.datosDTO.datosPersonales.edad

score 0 · Answer 3

Make sure that the function returns a data of type number instead of void .

Instead of var use let or const .

I added a else to return a 0 , so I make sure that I always function I returned a number.

CalculateAge(): number {
    if (this.datosDTO.datosPersonales.fechaNacimiento) {
        let timeDiff = Math.abs(Date.now() - <any>this.datosDTO.datosPersonales.fechaNacimiento);
        return Math.ceil((timeDiff / (1000 * 3600 * 24)) / 365);
    } else {
        return 0;
    }
}

This is my proposal which works with Date objects and I use operations that I can perform with dates. I also use a getter function that is responsible for returning a data of numeric type.

get CalculateAge(): number {
    const today: Date = new Date();
    const birthDate: Date = new Date(this.datosDTO.datosPersonales.fechaNacimiento);
    let age: number = today.getFullYear() - birthDate.getFullYear();
    const month: number = today.getMonth() - birthDate.getMonth();
    if (month < 0 || (month === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    return age;
}