Ionic2中输入验证错误的CSS类

Question

当输入验证无法突出显示输入（红色）时，是否可以设置任何类？

Answer 1

这些类由Ionic添加到ion-input或ion-select元素：

State                          Class if true    Class if false
-----                          -------------    --------------
Control has been visited       ng-touched       ng-untouched
Control's value has changed    ng-dirty         ng-pristine
Control's value is valid       ng-valid         ng-invalid

因此，您可以使用ng-touched和ng-invalid在该字段中显示错误消息。