How to remove the "rate" button if the rating has already been left from this ip?

Question

JavaScript

Hello.

How to remove the "rate" button if the rating has already been left from this ip?

Answer 1

Write to the database not only +1 to the rating, but create a separate rating table and write the IP of everyone who "rated G" there.
When evaluating, check for entries with the given IP in the table.

Answer 2

In addition to the streetflush described above, when loading the page (forming it in php), check whether the user with this ip voted for this news. If yes - do not download the button. If not, download.