How to make a field mandatory inside the widget on change of a field value in widget ?

[bala_1312]

there is  a drop down field in a widget so when the values will be changing then i need to make  a input type ="text" field mandatory , how to achieve that please advise .

Thanks!

[Priyanka0402]

Hello@debo jyoti , 

Use Catalog client script.

Thank you.

[bala_1312]

Hi @Priyanka0402 ,

But its a widget variable right which is created from html ? its not  present in catalog variables .