Html file attachment?

I'm writing a web page (PHP / html / css), and I would like to get my users to enter a lot of data, always composed of the same information: day, hour, title, details, class. To do this, I need fields <table>with <input>, but with an additional function that looks like a spreadsheet, and that users can copy-paste (blocks) rows and move rows around, since they will often need to enter a lot of similar data.

I want to reinvent the wheel again if I have to write it from scratch. How am I best to do this? Is there any standard package (e.g. in javascript) that allows such functions?

Note. I do not need any spreadsheet functions (formulas, etc.), just copy / paste / move to the input. Thus, a complete package of spreadsheets is likely to be redundant as well as cluttering up the interface.