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<?php
add_action('init', 'ninja_forms_register_edit_field_help');
function ninja_forms_register_edit_field_help(){
    add_action('ninja_forms_edit_field_after_registered', 'ninja_forms_edit_field_help', 10);
}

function ninja_forms_edit_field_help($field_id){
    global $ninja_forms_fields;
    $field_row = ninja_forms_get_field_by_id($field_id);
    $field_type = $field_row['type'];
    $field_data = $field_row['data'];
    $reg_field = $ninja_forms_fields[$field_type];
    $edit_help = $reg_field['edit_help'];
    if($edit_help){
        if(isset($field_data['help_text'])){
            $help_text = $field_data['help_text'];
        }else{
            $help_text = '';
        }

        if(isset($field_data['show_help'])){
            $show_help = $field_data['show_help'];
        }else{
            $show_help = '';
        }

        if( $show_help == 1 ){
            $display_span = '';
        }else{
            $display_span = 'display:none;';
        }

        $help_desc = sprintf( __( 'If "help text" is enabled, there will be a question mark %s placed next to the input field. Hovering over this question mark will show the help text.', 'ninja-forms' ), '<img src="'.NINJA_FORMS_URL.'images/question-ico.gif">') ;
        ninja_forms_edit_field_el_output($field_id, 'checkbox', __( 'Show Help Text', 'ninja-forms' ), 'show_help', $show_help, 'wide', '', 'ninja-forms-show-help');
        ?>
        <span id="ninja_forms_field_<?php echo $field_id;?>_help_span" style="<?php echo $display_span;?>">
            <?php
            ninja_forms_edit_field_el_output($field_id, 'textarea', __( 'Help Text', 'ninja-forms' ), 'help_text', $help_text, 'wide', '', 'widefat');
            ninja_forms_edit_field_el_output($field_id, 'desc', $help_desc, 'help_desc');
            ?>
        </span>
        <?php
    }
}