Please! 2 function simple but useful

Sorry for my english
1:I need a function that when user click on food(Put it in to cart)
Lets admin to decide a JS or something like that
what i need is when user pick some food on their phone, my website will be send an alert messagebox to tell them”$FOODNAME already in your cart,you can checkout ….!@#&*^!@#*^)”

thanks for your time to read my english!!!!
and thanks again for your great plugin..i really love it and going to make some bigs on it

2:also i need a function that for Admin to setup a time for every/any food..like rice=12:00-7:00only soup=6:00-11:00only…i hope you understading what i’m saying hahaha (Better Meal Sizes for every food too)
thanks…thanks..thanks…

https://ww.wp.xz.cn/plugins/wppizza/