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How to insert a new confirmation message via 'gform_pre_submission'

  1. I'm using gform_pre_submission to do some calculations on the values from my form after it's submitted. I want to display this result in my confirmation message. I tried replacing the form's confirmation message by assigning my result value to 'message' in the 'confirmation' array. But no luck!
    Any way I can achieve this?
    Note: I know about the gform_confirmation filter, but I don't know how to use it in my case.
    Here's what I tried:

    add_action('gform_pre_submission', 'my_processing');
    function my_processing($form){
        //add up the values
        $val = $val1+$val2....
        //what I tried
        $form['confirmation']['message'] = 'The answer is:- '.$val;

    Please reply guys!

    Posted 7 years ago on Wednesday March 28, 2012 | Permalink