Angular 5 ngClass與if

Question

這是我在表中一行的代碼

  <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>

特定的ngClass代碼

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

如果該設備的onlineState處於“脫機”狀態， 我希望該行 highlight 該類。 device.onlineState either returns Online or Offline 。 如果onlineState為Online，則不應有一個類。

Answer 1

嘗試將ngClass放在方括號內，例如[ngClass] 。 有關更多詳細信息 。

回答：

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

如果要添加multiple classes ，可以執行以下操作：

選項1：

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

選項2：

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

Answer 2

您可以執行以下操作：

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

並且您已經必須執行[ngClass]而不是ngClass來允許表達式的執行。

Answer 3

ngClass是一個指令，它接受一個對象作為參數，以您的類的名稱作為屬性，而條件作為值，例如：

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

您可以添加多個這樣的類：

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

要么

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