Html Angular 5 下拉菜单

Angular 5 dropdown menu

提问by Mr. Toast

Angular 5 I cant get the dropdown menu to display the "category", the category exsist in item.category and categories, and is the same. I've tried with ngModel and ngValue and just value and cant get it to work

Angular 5 我无法让下拉菜单显示“类别”，该类别存在于 item.category 和类别中，并且是相同的。我已经尝试过 ngModel 和 ngValue 并且只是价值并且无法让它工作

<td>
   <select [(ngModel)]="item.category">
        <option style="display:none">select a category</option>
        <option *ngFor="let item of categories" [ngValue]="item.category" value="item.category">{{item.category}}</option>
      </select>
    </td>

回答by Lonna

For me work like this:

对我来说，像这样工作：

<select [(ngModel)]="category" id="category">
   <option value="" disabled selected>select a category</option>
   <option *ngFor="let item of categories" [value]="item.category">{{item.category}}</option>
 </select>