Record POST form entry in iis logs

I am trying to find a way to capture information from a form POST in the corresponding IIS logs for some debugging purposes.

I have a form that captures data and is then added to a database. From time to time the data is not added and there is no entry in my internal logs, but I can see the page request being made in the IIS log.

If the FORM used GET, then I would be able to see the data being sent, but as the form is secure and needs POST, I all can see in the IIS logs is the PHP file name.

Is there a way to capture a form field and include it in the form action as a querystring. May be using ajax to populate the querystring?

So my form would look something like, where xxxxxx is the data being entered, which then also shows in the querystring:

<form method="post" action="action.php?data=xxxxxx">
<input name="data" type="text" value="xxxxxx">
<input value="SUBMIT" type="submit">
</form>

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