How to using sweet alert in codeigniter

I want to make validation form login user when form validation error show error form controller to view codeigniter ? anyone can help me

Can you try to rephrase that ? I have no idea what you're actually trying to do and I have a feeling a few other people will struggle trying to decipher that too.

Something about doing something after the form validation?

Codeigniter is simply one of the tools you need to learn to be a successful developer. Always add more tools to your coding arsenal!