How to Dynamically Populate Select Options in Ionic 2 using JSON Data

I am currently working on dynamically populating an ion-select dropdown with a JSON object.

This is how my HTML component is structured:

<ion-item [hidden]="editOptions.isEditing">
  <ion-note stacked color="primary">{{label}}</ion-note>
  <ion-note class="inline-edit"> {{value}}&nbsp;</ion-note>
</ion-item>
<ion-item [hidden]="!editOptions.isEditing">
  <ion-label stacked color="primary">{{label}}</ion-label>

  <ion-select [(ngModel)]="value" [selectOptions]="additionalData" [required]="required" [name]="value">
    <!--<ion-option>None</ion-option>-->
  </ion-select>
</ion-item>

However, when I try to populate the select options in my calling code, I face the issue of not having any examples in their documentation.

additionalData = {
  title: 'Pizza Toppings',
  subTitle: 'Select your toppings',
  mode: 'md'
};

I am looking for a way to add my options to this select without using *ngFor directly in the HTML. My preference would be to pass them like this:

additionalData = {
  title: 'Pizza Toppings',
  subTitle: 'Select your toppings',
  mode: 'md'
  options: [{id:1, description:'Pepperoni'}]
};

Answer №1

When using the [selectOptions], it is important to create an iterable out of your JSON object and utilize *ngFor (see documentation).

Example of *ngFor:

An efficient method for accessing object keys and values involves utilizing Object.keys, as recommended in this response provided below.

@Component({
  selector: 'my-page',
  templateURL: 'my-page.html
})

export class MyPage {
    // Making use of Object.keys
    objectKeys = Object.keys;
    value = { option1: 'foo', option2: 'bar' };  

    constructor(){}
}

HTML

...  
    <ion-select [(ngModel)]="value" [required]="true" [name]="value">
        <ion-option *ngFor="let option of objectKeys(value)">
            {{ value[option] }}
        </ion-option>
    </ion-select>
...

By following this approach, there is no need to create a custom pipe that essentially duplicates the same functionality.

Answer №2

Maybe you have experimented with...

<ion-select [selectOptions]="{
  title: 'Ice Cream Flavors',
  subTitle: 'Choose your favorite flavor',
  mode: 'ios'
   }">
</ion-select>

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