I want to have alert notification on logic hook.

You can just make the field required via Studio. Then you don't need a LogicHook

What if I have any custom error like 

if ($gender == "Male")
{

//Need to show alert message ("Customer ID empty")
}

How can we have alert notification in this scenario ?

You can implement custom Field Validation . It works like a charm.

Hi Gautam,

You cannot throw an alert using the logic hooks. Logic hooks are not meant for it. It allows you to append actions to system events such as when creating, editing and deleting records, etc. If you want to do any validation like this you have to extend your record view and create a view and write the code in js. Please go through this link as Andre Lopes suggested. 

Hope this helps.

Thank you

PK,

Senior Solution Engineer,

www.bhea.com

Data validations are configurable with the Logic Builder tool starting version 7.9

please check the posts:

1) https://sugarclub.sugarcrm.com/dev-club/f/questions-answers/4623/how-do-you-add-a-validationtask

2) https://sugarclub.sugarcrm.com/dev-club/f/questions-answers/4659/improve-task-contact-name-with-account-validation/23068