Using Angular Material, I implemented a multiple selection feature.
<mat-form-field>
<mat-select placeholder="Toppings" [formControl]="toppings" multiple>
<mat-option *ngFor="let topping of toppingList" [value]="topping">{{topping}}</mat-option>
</mat-select>
</mat-form-field>
I am looking to set some options to either true or false based on my needs, but I am not sure how to do so.
Before: https://i.sstatic.net/jc8af.png After: https://i.sstatic.net/GAjzU.png
When retrieving a response from an API, it will be received asynchronously.
To handle this situation, you can utilize the setValue method on either your FormControl or FormGroup instance to establish default values.
An example of how this could be implemented is shown below:
import { Component } from '@angular/core';
import { FormControl } from '@angular/forms';
import { DataService } from './data.service';
@Component({
selector: 'select-multiple-example',
templateUrl: 'select-multiple-example.html',
styleUrls: ['select-multiple-example.css'],
})
export class SelectMultipleExample {
toppingList: string[] = [
'Extra cheese',
'Mushroom',
'Onion',
'Pepperoni',
'Sausage',
'Tomato'
];
selectedByDefault;
toppings: FormControl;
constructor(private dataService: DataService) {}
ngOnInit() {
this.toppings = new FormControl(this.selectedByDefault);
this.dataService.selectedValues$
.subscribe(values => this.toppings.setValue(values));
}
}
For further reference, here is a Functional Sample on StackBlitz.
An easy solution is to set default values for your form by specifying which values you want to appear as "checked" when initializing your FormGroup. Make sure that the values match exactly for it to work correctly.
Check out this functional stackblitz demo -->
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