Angular2 template html loop array to return true of false

Question

Example:

I have the following Object:

{
  "Person": {
    "Name": {},
    "Hobbies": {
      "0": {
        "Description:Soccer": {},
        "IsActive:false": {}
      },
      "1": {
        "Description:Hockey": {},
        "IsActive:false": {}
      },
      "2": {
        "Description:Tennis": {},
        "IsActive:true": {}
      }
    }
  }
}

I would like to loop through the array and check wether any hobby is active. If so it should return true, and display an image.

<img [src]="Person.Hobbies != null ? './images/hobby.png' : ''"/>

I would like the image to only show one time.

Is that possible using html?

Iancovici · Accepted Answer · 2017-07-26 15:02:38Z

1

You can loop with ngFor, to show all in array.

<img [src]='./images/hobby.png' *ngFor="let hobby in Person.Hobbies"> </img >

then add an ngIf condition for each hobby in the list if there's any specific reason you only want to show a subset.

Example

<div *ngFor="let hobby in Person.Hobbies">
  <img *ngIf="hobby.IsActive"  [src]='./images/hobby.png'>
</div>

answered Jul 26, 2017 at 15:02

Iancovici

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1 Comment

Maniac_1979 Over a year ago

Thank you. Exactly what I was looking for.

Explosion Pills · Accepted Answer · 2017-07-26 15:05:08Z

0

I would set a property in your Component

<img *ngIf="showHobbyImg">

this.showHobbyImg = false;

const hobbies = this.person.Person.Hobbies;
for (key in hobbies) {
  if (hobbies["IsActive:true"]) {
    this.showHobbyImg = true;
    break;
  }
}

If you're using lodash you could simplify this a bit:

this.showHobbyImg = _.some(this.person.Person.Hobbies, ['IsActive:true', {}]);

answered Jul 26, 2017 at 15:05

Explosion Pills

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