Angular2 ngClass not working

Question

I want to add a class with condition but it is not working

    <tr *ngFor="let time of times; let i = index">
        <td [ngClass]="{'red-time':checkInvalid(time['Proles Arrive'])}">{{time['Proles Arrive']}}</td>
</tr>

This is in my HTML

  checkInvalid(entry: string){ 
console.log("This is the entry:"  + entry);
    return entry === 'Invalid Entry';
  }

But the class is never added, even though when i log the entry it says "Invalid Entry"

Even when i use "[ngClass]="{'red-time':true}" its still not adding the class.

Any suggestions please?

Answer 1

更改条件如下

<td [ngClass]="{'red-time':checkInvalid(time['Proles Arrive'])==true}">{{time['Proles Arrive']}}</td>