The current issue I am facing is that the option disabled with value="null" selected is not being shown on the screen. Instead, it should display as "Choose User Types"

https://i.sstatic.net/JqZ7O.png

<select class="form-control" id="ddSelectaTopic"
    onchange="if(this.value==='') {this.style.color='#999'} else {this.style.color='#333'}" [(ngModel)]="user_type_id"
    (change)="TypeChange($event.target.value,access_id)" [disabled]="access_id == 1 || !access_id">
    <option disabled [value]="null" selected>Choose User Types</option>
    <option *ngFor="let type of UserTypes; let i = index" [attr.value]="type.id" [attr.selected]="i == 0 ? true : null">
        <span *ngIf="access_id">{{type.name}}</span>
    </option>
    <option value="newType">New User Type</option>
</select>

Attempting to modify the disabled value to null selected results in the "Choose User Types" not being displayed.

angulartypescript

Answer №1

To assign a value of null to a select option, utilize [ngValue]="null". Using [value]="null" will result in Angular always binding the value as a string. Consequently, when the comparison is executed, a string value will be compared to null, which will always evaluate as false. This discrepancy may explain why your option is not being selected.

<option disabled [ngValue]="0" selected>Choose User Types</option>
<option *ngFor="let type of UserTypes; let i = index" [ngValue]="type.id">
  <span>{{type.name}}</span>
</option>

Answer №2

For displaying the message "Choose User Types", make use of value="" instead of [value]="null"

<select class="form-control" id="ddSelectaTopic"
    onchange="if(this.value==='') {this.style.color='#999'} else {this.style.color='#333'}" [(ngModel)]="user_type_id"
    (change)="TypeChange($event.target.value,access_id)" [disabled]="access_id == 1 || !access_id">
    <option disabled value="" selected>Choose User Types</option>
    <option *ngFor="let type of UserTypes; let i = index" [attr.value]="type.id" [attr.selected]="i == 0 ? true : null">
        <span *ngIf="access_id">{{type.name}}</span>
    </option>
    <option value="newType">New User Type</option>
</select>

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