带if的角5 ngClass

Question

这是表中一行的代码

  <tr class="user-item" *ngFor="let device of group.devices" (click)="$event.stopPropagation()" ngClass="device.onlineState == 'Offline' ? 'highlight' : 'highlight2'">
    <td class="qkFix">{{ device.deviceId }}</td>
    <td class="qkFix">{{ device.alias }}</td>
    <td class="qkFix" *ngIf="device.onlineState == 'Online'" ngClass="colorOnline">{{ device.onlineState }}
      <span class="dotOnline"></span>
    </td>
    <td class="qkFix" *ngIf="device.onlineState == 'Offline'" ngClass="colorOffline">{{ device.onlineState }}
      <span class="dotOffline"></span>
    </td>
    <td class="qkFix">
      <button type="button" class="btn btn-default btn-xs" (click)="$event.stopPropagation(); showDevice(device); editDeviceDialog()">
        <i class="material-icons">{{ (auth.hasPermissions(['update-devices'], true)) ? 'edit' : 'open_in_new'}}</i>
      </button>
      <button [disabled]="!(auth.hasPermissions(['delete-devices'], true))" type="button" class="btn btn-default btn-xs" (click)="$event.stopPropagation();deleteDevice(device)">
        <i *ngIf="(auth.hasPermissions(['delete-devices'], true))" class="material-icons" (click)="$event.stopPropagation();deleteDevice(device)">delete</i>
        <i *ngIf="!(auth.hasPermissions(['delete-devices'], true))" class="material-icons" (click)="$event.stopPropagation()">delete</i>
      </button>
      <button *ngIf="device.onlineState == 'Online'" [disabled]="!(auth.hasPermissions(['remote-control'], true))" type="button" class="btn btn-default btn-xs" (click)="$event.stopPropagation(); remoteSession(device)">
        <i *ngIf="(auth.hasPermissions(['remote-control'], true))" (click)="$event.stopPropagation();remoteSession(device)" class="material-icons">swap_horiz</i>
        <i *ngIf="!(auth.hasPermissions(['remote-control'], true))" (click)="$event.stopPropagation()" class="material-icons">swap_horiz</i>
      </button>
    </td>
  </tr>

专用ngClass码

ngClass="device.onlineState == 'Offline' ? 'highlight' : 'highlight2'"

，我希望行具有类 highlight ，如果该设备的onlineState是脱机的。 device.onlineState either returns Online or Offline。如果onlineState是联机的，就不应该有一个类.

Answer 1

尝试将ngClass放在括号中，即[ngClass]。想了解更多细节。

答案：

 [ngClass]="device.onlineState == 'Offline' ? 'highlight' : 'highlight2'"

如果要添加multiple classes，可以这样做：

option1:

 [ngClass]="condition ? 'class1 class2 class3' : 'class4 class5 class6'"

Option2:

[ngClass]="{'class1': condition1, 'class2': Condition2}"

Answer 2

你可以这样做：

  [class.highlight]="device.onlineState == 'Offline'"

您已经必须执行[ngClass]而不是ngClass来允许表达式的执行。

Answer 3

ngClass是一个指令，它以类的名称作为属性值和条件作为值，接受对象作为参数，例如：

[ngClass]="{'highlight': device.onlineState === 'Offline'}"

您可以添加这样的多个类：

[ngClass]="{'highlight other-class': device.onlineState === 'Offline'}"

或

[ngClass]="{'highlight': device.onlineState === 'Offline', 'other-class': condition}"