Tips for setting or patching multiple values in an ngselect within a reactive form

I am facing an issue with my ng select feature that allows users to select multiple languages. However, upon binding multiple selected values in the ng select, empty tags are being displayed. I have included my code below. **When editing, I want to display the saved language tags on the ng select, but it is currently showing empty tags. Any assistance would be greatly appreciated. I am using a reactive form**

HTML

 <ng-select class="w-100" [multiple]="true"   [hideSelected]="true" placeholder="Please Select Language"
            formControlName="language" [bindValue]="language.id"  [bindLabel]="language.name" 
            >
            <ng-option *ngFor="let language of languages" [value]="language.id">{{language.name}}</ng-option>
          </ng-select>

Typescript

this.form.patchValue({ language: this.editData.teacherProfile.teacherProfile.language })

Data is retrieving in this form "language": [ { "_id": "5fb79cdd34ec021e64c2413e", "name": "English", "id": "5fb79cdd34ec021e64c2413e" }, { "_id": "5fb7996034ec021e64c2412a", "name": "Arabic", "id": "5fb7996034ec021e64c2412a" } ],

angulartypescriptangular-materialangular-ngselect

Answer №1

Ensure that the value you are assigning to the field is included in the available options

For example, if the select dropdown options include ids like 2, 3, 4, make sure to assign one of these values so that it will be displayed correctly

In this scenario, when sharing data with a specific structure, gather all ids into an array

languageID = [2, 3, 4, 5]

and then apply this array directly to the field using patchValue method

this.form.patchValue({ languageid: this.languageID })

Answer №2

ng-select receives input from an array, specifically an array consisting of IDs rather than objects.

To address this, you can write code like:

myForm.get('language').setValue(
               language.map(x=>x.id)
)

This example demonstrates how to extract a specific property, 'id', using the map method to create a new array.

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