Ajax :: POST Method And Send - Store The Search Terms In A Database

I too have a problem with Ajax POST method and Send. I have set up a Site Search using the Google Ajax Search API, and it works fine. The search term is stored in the variable (?) query. Just to make sure, I have set up a new variable (searchTerm) to read the value of query, and a temporary Alert box shows that this variable does indeed contain the search term.

I want to store the search terms in a database so I can see what people are searching for. So I set up a POST method to send the searchTerm to a php file, which uses if (isset($_POST['searchTerm'])) to obtain the searchTerm and then insert it into a MYSQL database. But it doesn't work.

When I couldn't insert into the database, I added a second (temporary) insert using a dummy value as the else part of the above if statement, to test (1) if the Ajax file was actually setting the php file going, and (2) to check my Insert code was working. Both work.

So the problem is clearly that either the Ajax code doesn't Send correctly, or the php isn't receiving it. I am stumped to find what is wrong. Here are the two relevant sections of code:

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To repeat, the php is running and always loads the dummy variable from the else section, indicating that isset($_POST['searchTerm']) is null.