Gravity Forms - Move Progress Bar to Bottom of Form

gravity-forms-move-progress-bar-bottom.php

<?php
/**
* Plugin Name: Gravity Forms: Move Progress Bar to Bottom of Form
* Plugin URI: http://www.n7studios.co.uk
* Version: 1.0.0
* Author: n7 Studios
* Author URI: http://www.n7studios.co.uk
* Description: Moves the progress bar from the top to the bottom of the Gravity Form.  The Start Paging section of the form MUST have a CSS class = progress-bar-bottom
*/

/**
* Moves the progress bar from the top to the bottom of the Gravity Form
* if the Start Paging section of the form has a CSS class = progress-bar-bottom
*
* @since 1.0.0
*
* @param string $form_string    Form HTML
* @param array  $form Gravity   Form Configuration
* @return string                Form HTML
*/
function gravity_forms_move_progress_bar( $form_string, $form ) {

    // Check if Pagination is enabled on this form
    if ( ! is_array( $form['pagination'] ) ) {
        return $form_string;
    } 
    if ( empty( $form['pagination']['type'] ) ) {
        return $form_string;
    }

    // Check if the first page CSS class is progress-bar-bottom
    if ( ! isset( $form['firstPageCssClass'] ) ) {
        return $form_string;
    }
    if ( $form['firstPageCssClass'] != 'progress-bar-bottom' ) {
        return $form_string;
    }

    // If here, the progress bar needs to be at the end of the form
    // Load form string into DOMDocument
    $dom = new DOMDocument;
    @$dom->loadHTML( $form_string );

    // Load Xpath
    $xpath = new DOMXPath( $dom );

    // Find Progress Bar
    $progress_bar = $xpath->query( '//div[@class="gf_progressbar_wrapper"]' )->item(0);

    // Find Form
    $form = $xpath->query( '//form' )->item(0);

    // Move Progress Bar to end of the Form
    $form->appendChild( $progress_bar );

    // Get HTML string
    $form_string = $dom->saveHTML();

    // Return modified HTML string
    return $form_string;

}
add_filter( 'gform_get_form_filter', array( $this, 'gravity_forms_move_progress_bar' ), 10, 3 );

Is there anything that would keep this from working in a multi-site environment?

Activating this plugin causes all of my forms to not appear regardless of pagination or progress-bar-bottom class being used and generates an error in the log:

PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in wp-includes/class-wp-hook.php on line 300

Using Wordpress 4.7.3, Gravity Forms 2.2.1, PHP 7.0

Thank you for the DOM related code that performs the move.

FWIW if you change line 63 to the following, it works as intended:

add_filter( 'gform_get_form_filter', 'gravity_forms_move_progress_bar', 10, 3 );

If you have more than one class in your form here then you will need to change line 35:

if ( $form['firstPageCssClass'] != 'progress-bar-bottom' ) {

        return $form_string;

   }

to something like this:

if ( strpos($form['firstPageCssClass'], 'progress-bar-bottom' ) === false) {

        return $form_string;

    }

@decaySmash thank you for your comment

In my case works, when changing line 35 to

    if ( strpos($form['firstPageCssClass'], 'progress-bar-bottom' ) !== false) {
        return $form_string;
    }