in the if statement, even if the value is null, when I click the button, it is still deleting the item which is in the array. I would be happy if you guys help, I have no idea.
[1]:
here is the picture https://i.stack.imgur.com/0Pm5K.png
>Solution :
You need to remove comparison with null, I mean next:
if(dele){
....
} else {
alert('Put a value');
}