Validations in dynamically added rows using anjularjs

Question

Hi,

In dynamically added rows i need validations

Please look at my screenshot 

 https://ibb.co/Svx85jQ

coming to my requirement i have one form  

1)For example if we want to add one more new row at that time i need to display validation messages in all item rows and alert message

2)At last i have one save button if we try to save item rows with out entereing item rows 

I need to display alert message please fill one item row

Could kindly any one help me'