在HTML / Bootstrap / angular2中的动态填充下拉列表中预选择前代内容

Question

I'm facing the issue to preselect an entry in a dynamic populated dropdown.

It's about a filed for choosing a language. The possible languages are populated dynamically. I want to have a preselected value as a hint, which is not included in this list. Eg "Choose language"

Here is my code what I thougt it might work:

<select id="languageSelection" class="form-control" [(ngModel)]="selectedLanguage" (ngModelChange)="onLanguageChange($event)">
    <option selected disabled hidden>Choose language</option>
    <option class="" *ngFor="let l of languages" [ngValue]="l">{{l}}</option>
</select>

I get the list of the languages, but there is a language preselected. If I remove the "hidden"-tag the "Choose language" appears grayed out in the list. But a language is preselected, too.

Thank you in advance!

Answer 1

[(ngModel)] is overriding the selected attribute. A workaround would be to set a predefined value to your variable selectedLanguage , and use that in the options as default value, so for example:

TS:

selectedLanguage = 0;

HTML:

<select id="languageSelection" class="form-control" [(ngModel)]="selectedLanguage" (ngModelChange)="onLanguageChange($event)">
    <option [disabled]="true" value="0">Choose Language</option>
    <option class="" *ngFor="let l of languages" [ngValue]="l">{{l}}</option>
</select>

That should do it :)