Resize item and add new item

[farFara99]

Hi sorry if this question sounds too stupid .
Im a beginner i just need to know how to create function to resize the item and add new item

[farFara99]

Sorry was rushing yesterday so i posted this without further explanation.
Attached codes above are the codes im trying to implement in muuri grid and creating a method to handle the event . What am I doing wrong with the codes ? missing something ? please guide and correct me. thank you