I need hide a view when some GET param exists. It should be hidden like if you insert 'Global: Null' in contextual filter(It hides view if no results). This view placed in panel*
I tried to find the solution but failed. How to do this?
You just have to specify a validation criteria in a contextual filter, could be Global:null as you said. Then choose the action you want to take when validation fails. You can implement your validation logic in PHP, preferably inside a function in your code and you just call it from the view. Hope that helps.
I am guessing you are adding it as a block to a specific path. If yes, follow the steps below: