使用在AngularJS中动态构建的表中的输入验证行

I've been struggling on the solution to the following problem. I have a table in which every row is build dynamically by ngRepeat. Every row has four columns and in every column there is an input element. My question is - how can I validate these four input fields and show the row in red if at least one of this four inputs is invalid.I've been struggling on the solution to the fol