Looking for the right hook to trigger SQL query

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    I’ve written a PHP function which will perform a lookup in a custom table and pull in additional values to populate a Quform dropdown. I want this function called after the user enters input into a certain field. The function is currently set up with a static value for testing and is functioning properly using the
    add_action('quform_pre_display_1', 'my_form_values');

    However, this only works with my static testing value as this hook launches before any input from user. What hook can I set to send the value and trigger my function after the input for that part of the form is entered?

    Basically the user picks a product and I lookup the current pricing options and return it on the next section of the form.

    $product = $form->getValue('quform_1_10');

    this $product will be used in the WHERE statement of the sql query.

    Thanks for any help in advance!


    This must be done through a js function calling php.
    I suggest to read this subject: php call through ajax

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