The hx-include attribute allows you to include additional element values in an AJAX request. The value of this attribute can be:

Here is an example that includes a separate input value:

    <button hx-post="/register" hx-include="[name='email']">
    Enter email: <input name="email" type="email"/>

This is a little contrived as you would typically enclose both of these elements in a form and submit the value automatically, but it demonstrates the concept.

Note that if you include a non-input element, all input elements enclosed in that element will be included.