PHP避免长时间加载导致的重复

Question

I have a site where you can submit data into the db. Everything works fine but sometimes when I click to submit it takes long time. I noticed that some people try to click submit a couple of times while it is still loading and this way they insert the same entry more times in the database.

What is the solution for this problem?

Answer 1

You can disable the button after the user submitted the form.

Here is a SO question/answer whith an example:
Disable button after submit with jQuery

If you don't use jQuery already you might use a vanilla js solution instead.