Adds a Button field type allowing you to add extra buttons to the form, supported type are button, submit and reset.

RW_Button_Field.php

<?php
/**
 * Plugin Name: Gravity Forms - Button Field
 * Last Modified: 22/06/2014
 */

class RW_Button_Field {

    function __construct() {
        if( ! property_exists( 'GFCommon', 'version' ) || ! version_compare( GFCommon::$version, '1.8', '>=' ) )
            return;
        add_filter( 'gform_add_field_buttons', array( $this, 'add_field_button' ) );
        add_filter( 'gform_field_type_title', array( $this, 'add_field_title' ) );
        add_action( 'gform_field_standard_settings', array( $this, 'button_type_setting' ), 10, 2 );
        add_action( 'gform_field_advanced_settings', array( $this, 'onclick_setting' ), 10, 2 );
        add_action( 'gform_editor_js', array( $this, 'add_field_settings' ) );
        add_action( 'gform_editor_js_set_default_values', array( $this, 'set_field_defaults' ) );
        add_filter( 'gform_tooltips', array( $this, 'add_tooltip') );
        add_filter( 'gform_field_input', array( $this, 'add_field_input' ), 10, 5 );
        add_filter( 'gform_field_content', array( $this, 'add_field_content' ), 10, 5 );
        add_filter( 'gform_submit_button', array( $this, 'remove_submit_button' ), 10, 2 );
    }

    // add button to fields panel
    function add_field_button( $field_groups ) {
        $field_groups[0]['fields'][] = array(
            'class' => 'button',
            'value' => __( 'Button', 'gravityforms' ),
            'onclick' => "StartAddField( 'button' );"
        );
        return $field_groups;
    }

    // add title to field container
    function add_field_title( $title ) {
        if ( $title == 'button' ) {
            $title = __( 'Button', 'gravityforms' );
        }
        return $title;
    }

    // add button type dropdown to the fields properties tab
    function button_type_setting( $position, $form_id ) {
        if($position == 25){
            ?>
            <li class="button_type_setting field_setting">
                <label for="button_type">
                    <?php _e( 'Button Type', 'gravityforms' ); ?>
                    <?php gform_tooltip( 'form_field_type' ) ?>
                </label>
                <select id="button_type" onchange="SetFieldProperty('buttonType', this.value); jQuery('#field_settings').slideUp(function(){StartChangeInputType(jQuery('#button_type').val());});">
                    <option value="button"><?php _e( 'Button', 'gravityforms' ); ?></option>
                    <option value="submit"><?php _e( 'Submit', 'gravityforms' ); ?></option>
                    <option value="reset"><?php _e( 'Reset', 'gravityforms' ); ?></option>
                </select>
            </li>
            <li class="disable_footer_submit_setting field_setting">
                <input type="checkbox" id="disable_footer_submit" onclick="SetFieldProperty('disableSubmit', this.checked);"/>
                <label for="disable_footer_submit" class="inline">
                    <?php _e( 'Disable Footer Submit Button', 'gravityforms'); ?>
                    <?php gform_tooltip( 'disable_footer_submit' ) ?>
                </label>
            </li>
            <?php
        }
    }

    // add onclick input to the fields advanced tab
    function onclick_setting( $position, $form_id ) {
        if($position == 50){
            ?>
            <li class="button_onclick_setting field_setting">
                <label for="button_onclick">
                    <?php _e( 'Button onclick', 'gravityforms' ); ?>
                    <?php gform_tooltip( 'button_onclick' ) ?>
                </label>
                <textarea id="button_onclick" class="fieldwidth-3 fieldheight-2" onkeyup="SetFieldProperty('onclick', this.value);"></textarea>
            </li>
            <?php
        }
    }

    // add settings to the field tabs
    function add_field_settings() {
        ?>
        <script type='text/javascript'>
            fieldSettings['button'] = '.button_type_setting, .button_onclick_setting, .conditional_logic_field_setting, .label_setting, .css_class_setting';
            fieldSettings['submit'] = '.disable_footer_submit_setting, .button_type_setting, .button_onclick_setting, .conditional_logic_field_setting, .label_setting, .css_class_setting';
            fieldSettings['reset'] = '.button_type_setting, .button_onclick_setting, .conditional_logic_field_setting, .label_setting, .css_class_setting';
            jQuery(document).bind('gform_load_field_settings', function(event, field, form){
                jQuery('#button_onclick').val(field.onclick == undefined ? '' : field.onclick);
                jQuery('#button_type').val(field.inputType);
                jQuery('#disable_footer_submit').prop('checked', field.disableSubmit == true ? true : false);
            });
        </script>
        <?php
    }

    function set_field_defaults() {
        ?>
        case 'button' :
            field.label = 'Button';
            field.inputType = 'button';
            field.displayOnly = true;
            field.disableSubmit = false;
        break;
        <?php
    }

    function add_tooltip( $tooltips ) {
        $tooltips['button_onclick'] = "Enter your custom script for the buttons onclick attribute. Don't forget to add the ending semicolon.";
        $tooltips['disable_footer_submit'] = "When enabled the submit button in the form footer will be removed.";
        return $tooltips;
    }

    // define the form editor apperance
    function add_field_input( $input, $field, $value, $lead_id, $form_id ) {

        if ( $field['type'] != 'button' ) {
            return $input;
        }

        if ( RG_CURRENT_VIEW == 'entry' ) {
            return false;
        }

        $tabindex = GFCommon::get_tabindex();
        $disabled = ( GFForms::is_gravity_page() ) ? "disabled" : "";

        $onclick_attr = ( $field['inputType'] == 'submit' || rgar( $field, 'onclick' ) ) ? "onclick='{SCRIPT}'" : "";
        $onclick_val = isset( $field['onclick'] ) ? esc_attr( $field['onclick'] ) : "";

        if ( $field['inputType'] == 'submit' ) {
            $onclick_val .= "if(window[\"gf_submitting_{$form_id}\"]){return false;}";
            if ( GFFormsModel::is_html5_enabled() ) {
                $onclick_val .= " if( !jQuery('#gform_{$form_id}')[0].checkValidity || jQuery('#gform_{$form_id}')[0].checkValidity()){window[\"gf_submitting_{$form_id}\"]=true;}";
            } else {
                $onclick_val .= " window[\"gf_submitting_{$form_id}\"]=true;";
            }
        }

        $onclick_attr = str_replace( '{SCRIPT}', $onclick_val, $onclick_attr );

        $input = "<div class='ginput_container'><button type='{$field['inputType']}' id='gform_button_{$form_id}_{$field['id']}' class='button gform_button' {$tabindex} {$onclick_attr} {$disabled}><span>" . esc_attr( $field['label'] ) . "</span></button></div>";
        return $input;
    }

    // define the front end apperance and remove field from entry view
    function add_field_content( $content, $field, $value, $lead_id, $form_id ) {
        if ( $field['type'] != 'button' ) {
            return $content;
        }

        if ( RG_CURRENT_VIEW == 'entry' ) {
            return false;
        }

        $id = $field["id"];

        $duplicate_field_link = "<a class='field_duplicate_icon' id='gfield_duplicate_$id' title='" . __("click to duplicate this field", "gravityforms") . "' href='#' onclick='StartDuplicateField(this); return false;'><i class='fa fa-files-o fa-lg'></i></a>";
        $duplicate_field_link = apply_filters("gform_duplicate_field_link", $duplicate_field_link);

        $delete_field_link = "<a class='field_delete_icon' id='gfield_delete_$id' title='" . __("click to delete this field", "gravityforms") . "' href='#' onclick='StartDeleteField(this); return false;'><i class='fa fa-times fa-lg'></i></a>";
        $delete_field_link = apply_filters("gform_delete_field_link", $delete_field_link);
        $field_type_title = GFCommon::get_field_type_title($field["type"]);
        $admin_buttons = IS_ADMIN ? "<div class='gfield_admin_icons'><div class='gfield_admin_header_title'>{$field_type_title} : " . __("Field ID", "gravityforms") . " {$field["id"]}</div>" . $delete_field_link . $duplicate_field_link . "<a class='field_edit_icon edit_icon_collapsed' title='" . __("click to expand and edit the options for this field", "gravityforms") . "'><i class='fa fa-caret-down fa-lg'></i></a></div>" : "";

        $content = sprintf( "%s%s", $admin_buttons, apply_filters( 'gform_field_input', '', $field, $value, $lead_id, $form_id ) );

        return $content;
    }

    function remove_submit_button( $button, $form ) {
        foreach( $form['fields'] as $field ) {
            if( $field['type'] == 'button' && $field['disableSubmit'] ) {
                return;
            }
        }
        return $button;
    }

}
new RW_Button_Field();

thanks for this @richardW8k - I'm also wondering how to use it.

Richard -- thank you for this code. I am also using gravity perks "populate anything" plugin on my form. I'd like to dynamically alter the button event click details based on the value chosen in a previous field.

Basically I have several rows of data entry fields and want to have an EDIT button for each row. The form user manually enters an ID in the first field of each row. The perks code allows me to dynamically populate the next input[type=text] field in the row with some data based on the id# entered in first input[type=text] field. I'd like something similar for the button field.

Would you happen to have any guidance for me on how to do this?