We're using SharePoint online, I've created a custom list, item is save and close per item. Is there such a thing as saving and adding another item (redirecting you to the add item again). Without clicking the add item again.
You could add the following code to your NewForm.aspx page:
It will redirect you to the newform.aspx page each time you save, though. So if you no longer want to add a new item, you have to click cancel. In my opinion, it's probably better to use quick edit (in most situations).