} else {
                                            echo '-';
                                        }
                                    } else {
                                        _e('Non-assessable', 'cp');
                                    }
                                    ?>
														</td>

														<td class="column-comment <?php 
                                    echo $style . ' ' . $visibility_class;
                                    ?>
">
															<?php 
                                    if (count($response) >= 1) {
                                        $comment = Unit_Module::get_response_comment($response->ID);
                                    }
                                    if (isset($comment)) {
                                        ?>
																<a class="response_comment" alt="<?php 
                                        echo esc_attr(strip_tags($comment));
                                        ?>
" title="<?php 
                                        echo esc_attr(strip_tags($comment));
                                        ?>
">✓</a>
															<?php 
                                    } else {
                                        echo '-';
                                    }
                                    ?>
                                        $overall_grade = $overall_grade + $grade;
                                    } else {
                                        _e('Pending grade', 'cp');
                                    }
                                } else {
                                    echo '0%';
                                }
                                $assessable_answers++;
                            } else {
                                _e('Non-assessable', 'cp');
                            }
                            ?>
									</td>
								</tr>
								<?php 
                            $comment = Unit_Module::get_response_comment($id);
                            if (!empty($comment)) {
                                ?>
									<tr>
										<td colspan="4" style="background-color:#FF6600; color:#fff; margin-left:30px;">
											&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<?php 
                                echo $comment;
                                ?>
</td>
									</tr>
								<?php 
                            }
                            ?>

							</table>
							<?php 
        function student_workbook_table($args)
        {
            ob_start();
            extract(shortcode_atts(array('module_column_title' => __('Element', 'cp'), 'title_column_title' => __('Title', 'cp'), 'submission_date_column_title' => __('Submitted', 'cp'), 'response_column_title' => __('Answer', 'cp'), 'grade_column_title' => __('Grade', 'cp'), 'comment_column_title' => __('Comment', 'cp'), 'module_response_description_label' => __('Description', 'cp'), 'comment_label' => __('Comment', 'cp'), 'view_link_label' => __('View', 'cp'), 'view_link_class' => 'assessment-view-response-link button button-units', 'comment_link_class' => 'assessment-view-response-link button button-units', 'pending_grade_label' => __('Pending', 'cp'), 'unit_unread_label' => __('Unit Unread', 'cp'), 'unit_read_label' => __('Unit Read', 'cp'), 'single_correct_label' => __('Correct', 'cp'), 'single_incorrect_label' => __('Incorrect', 'cp'), 'non_assessable_label' => __('**'), 'table_class' => 'widefat shadow-table assessment-archive-table', 'table_labels_th_class' => 'manage-column'), $args));
            $module_column_title = sanitize_text_field($module_column_title);
            $title_column_title = sanitize_text_field($title_column_title);
            $submission_date_column_title = sanitize_text_field($submission_date_column_title);
            $response_column_title = sanitize_text_field($response_column_title);
            $grade_column_title = sanitize_text_field($grade_column_title);
            $comment_column_title = sanitize_text_field($comment_column_title);
            $module_response_description_label = sanitize_text_field($module_response_description_label);
            $comment_label = sanitize_text_field($comment_label);
            $view_link_label = sanitize_text_field($view_link_label);
            $view_link_class = sanitize_html_class($view_link_class);
            $comment_link_class = sanitize_html_class($comment_link_class);
            $pending_grade_label = sanitize_text_field($pending_grade_label);
            $unit_unread_label = sanitize_text_field($unit_unread_label);
            $unit_read_label = sanitize_text_field($unit_read_label);
            $non_assessable_label = sanitize_text_field($non_assessable_label);
            $table_class = sanitize_html_class($table_class);
            $table_labels_th_class = sanitize_html_class($table_labels_th_class);
            $single_correct_label = sanitize_text_field($single_correct_label);
            $single_incorrect_label = sanitize_text_field($single_incorrect_label);
            $columns = array("title" => $title_column_title, "submission_date" => $submission_date_column_title, "response" => $response_column_title, "grade" => $grade_column_title, "comment" => $comment_column_title);
            $col_sizes = array('45', '15', '10', '13', '5');
            ?>
			<table cellspacing="0" class="<?php 
            echo $table_class;
            ?>
">
				<thead>
					<tr>
						<?php 
            $n = 0;
            foreach ($columns as $key => $col) {
                ?>
							<th class="<?php 
                echo $table_labels_th_class;
                ?>
 column-<?php 
                echo $key;
                ?>
" width="<?php 
                echo $col_sizes[$n] . '%';
                ?>
" id="<?php 
                echo $key;
                ?>
" scope="col"><?php 
                echo $col;
                ?>
</th>
							<?php 
                $n++;
            }
            ?>
					</tr>
				</thead>

				<?php 
            $user_object = new Student(get_current_user_ID());
            $modules = Unit_Module::get_modules(get_the_ID());
            $input_modules_count = 0;
            foreach ($modules as $mod) {
                $class_name = $mod->module_type;
                if (class_exists($class_name)) {
                    if (constant($class_name . '::FRONT_SAVE')) {
                        $input_modules_count++;
                    }
                }
            }
            $current_row = 0;
            $style = '';
            foreach ($modules as $mod) {
                $class_name = $mod->module_type;
                if (class_exists($class_name)) {
                    if (constant($class_name . '::FRONT_SAVE')) {
                        $response = call_user_func($class_name . '::get_response', $user_object->ID, $mod->ID);
                        $visibility_class = count($response) >= 1 ? '' : 'less_visible_row';
                        if (count($response) >= 1) {
                            $grade_data = Unit_Module::get_response_grade($response->ID);
                        }
                        if (isset($_GET['ungraded']) && $_GET['ungraded'] == 'yes') {
                            if (count($response) >= 1 && !$grade_data) {
                                $general_col_visibility = true;
                            } else {
                                $general_col_visibility = false;
                            }
                        } else {
                            $general_col_visibility = true;
                        }
                        $style = isset($style) && 'alternate' == $style ? '' : ' alternate';
                        ?>
							<tr id='user-<?php 
                        echo $user_object->ID;
                        ?>
' class="<?php 
                        echo $style;
                        echo 'row-' . $current_row;
                        ?>
">

								<?php 
                        if ($general_col_visibility) {
                            ?>

									<td class="<?php 
                            echo $style . ' ' . $visibility_class;
                            ?>
">
										<?php 
                            echo $mod->post_title;
                            ?>
									</td>

									<td class="<?php 
                            echo $style . ' ' . $visibility_class;
                            ?>
">
										<?php 
                            echo count($response) >= 1 ? date_i18n('M d, Y', strtotime($response->post_date)) : __('Not submitted', 'cp');
                            ?>
									</td>

									<td class="<?php 
                            echo $style . ' ' . $visibility_class;
                            ?>
">
										<?php 
                            if (count($response) >= 1) {
                                ?>
											<div id="response_<?php 
                                echo $response->ID;
                                ?>
" style="display:none;">
												<?php 
                                if (isset($mod->post_content) && $mod->post_content !== '') {
                                    ?>
													<div class="module_response_description">
														<label><?php 
                                    echo $module_response_description_label;
                                    ?>
</label>
														<?php 
                                    echo $mod->post_content;
                                    ?>
													</div>
												<?php 
                                }
                                ?>
												<?php 
                                echo call_user_func($class_name . '::get_response_form', get_current_user_ID(), $mod->ID);
                                ?>

												<?php 
                                if (is_object($response) && !empty($response)) {
                                    $comment = Unit_Module::get_response_comment($response->ID);
                                    if (!empty($comment)) {
                                        ?>
														<label class="comment_label"><?php 
                                        echo $comment_label;
                                        ?>
</label>
														<div class="response_comment_front"><?php 
                                        echo $comment;
                                        ?>
</div>
													<?php 
                                    }
                                }
                                ?>
											</div>

											<a class="<?php 
                                echo sanitize_html_class($view_link_class);
                                ?>
 thickbox" href="#TB_inline?width=500&height=300&inlineId=response_<?php 
                                echo $response->ID;
                                ?>
"><?php 
                                echo sanitize_html_class($view_link_label);
                                ?>
</a>

										<?php 
                            } else {
                                echo '-';
                            }
                            ?>
									</td>

									<td class="<?php 
                            echo $style . ' ' . $visibility_class;
                            ?>
">
										<?php 
                            if (isset($grade_data)) {
                                $grade = $grade_data['grade'];
                                $instructor_id = $grade_data['instructor'];
                                $instructor_name = get_userdata($instructor_id);
                                $grade_time = date_i18n(get_option('date_format') . ' ' . get_option('time_format'), $grade_data['time']);
                            }
                            if (count($response) >= 1) {
                                if (isset($grade_data)) {
                                    if (get_post_meta($mod->ID, 'gradable_answer', true) == 'no') {
                                        echo $non_assessable_label;
                                    } else {
                                        if ('radio_input_module' == $class_name) {
                                            if (100 == $grade) {
                                                echo $single_correct_label;
                                            } else {
                                                echo $single_incorrect_label;
                                            }
                                        } else {
                                            echo $grade . '%';
                                        }
                                    }
                                } else {
                                    if (get_post_meta($mod->ID, 'gradable_answer', true) == 'no') {
                                        echo $non_assessable_label;
                                    } else {
                                        echo $pending_grade_label;
                                    }
                                }
                            } else {
                                echo '-';
                            }
                            ?>
									</td>

									<td class="<?php 
                            echo $style . ' ' . $visibility_class;
                            ?>
 td-center">
										<?php 
                            if (!empty($response)) {
                                $comment = Unit_Module::get_response_comment($response->ID);
                                if (!empty($comment)) {
                                    ?>
												<a alt="<?php 
                                    echo strip_tags($comment);
                                    ?>
" title="<?php 
                                    echo strip_tags($comment);
                                    ?>
" class="<?php 
                                    echo $comment_link_class;
                                    ?>
 thickbox" href="#TB_inline?width=500&height=300&inlineId=response_<?php 
                                    echo $response->ID;
                                    ?>
"><i class="fa fa-comment"></i></a>
											<?php 
                                }
                            } else {
                                echo '<i class="fa fa-comment-o"></i>';
                            }
                            ?>
									</td>
								<?php 
                        }
                        //general col visibility
                        ?>
							</tr>
							<?php 
                        $current_row++;
                    }
                }
            }
            if (!isset($input_modules_count) || isset($input_modules_count) && $input_modules_count == 0) {
                ?>
					<tr>
						<td colspan="7">
							<?php 
                $unit_grade = do_shortcode('[course_unit_details field="student_unit_grade" unit_id="' . get_the_ID() . '"]');
                _e('0 input elements in the selected unit.', 'cp');
                ?>
							<?php 
                if ($unit_grade == 0) {
                    echo $unit_unread_label;
                } else {
                    echo $unit_read_label;
                }
                ?>
						</td>
					</tr>
				<?php 
            }
            ?>
				<?php 
            if (0 < $current_row) {
                ?>
					<tfoot><tr><td colspan="6">** <?php 
                _e('Non-assessable elements.', 'cp');
                ?>
</td></tr></tfoot>
				<?php 
            }
            ?>
			</table>
			<?php 
            $content = ob_get_clean();
            return $content;
        }