How to send data from the calculator on the site?

Question

PHP

In general, the site has a calculator in the form of a table.
We enter the data, we see the final cost.
The cost using a script is written to the p tag with the article_cost class,
how can this cost be sent to the mail?

Answer 1

In browser:

<p class="article_cost" id="test">213</p>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>


<script>
alert($(".article_cost").html());

$.post(
  "/ajaxtest.php",
  {
   calculated: $(".article_cost").html()
  },
  onAjaxSuccess
);
</script>

On server:

$f=fopen("log.txt","a");
fwrite($f,$_POST['calculated']);

Answer 2

Send to the server (POST request directly or via AJAX), and from the server - already to the mail.
It won't work without a server.

Answer 3

FormData + XMLHttpRequest (ajax), or fetch, or something similar.
Examples: https://developer.mozilla.org/en-US/docs/Web/API/F...