pressbooks aldine theme the theme used for the front page or default book
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<?php
namespace Aldine;
class PageButton extends \WP_Widget
{
/**
* Constructor.
*
* @see WP_Widget::__construct()
*
*/
public function __construct()
{
parent::__construct('pagebutton', __('Page Button', 'pressbooks-aldine'), [
'description' => esc_html__('Add a styled button which links to a page.', 'pressbooks-aldine')
]);
}
/**
* Front-end display of widget.
*
* @see WP_Widget::widget()
*
* @param array $args Widget arguments.
* @param array $instance Saved values from database.
*/
public function widget($args, $instance)
{
echo $args['before_widget'];
if (! empty($instance['page_id'])) {
if (empty($instance['title'])) {
$instance['title'] = get_the_title($instance['page_id']);
}
printf('<a class="button" href="%1$s">%2$s</a>', get_permalink($instance['page_id']), apply_filters('widget_title', $instance['title']));
}
echo $args['after_widget'];
}
/**
* Back-end widget form.
*
* @see WP_Widget::form()
*
* @param array $instance Previously saved values from database.
*/
public function form($instance)
{
$title = ! empty($instance['title']) ? $instance['title'] : '';
$url = ! empty($instance['page_id']) ? $instance['page_id'] : ''; ?>
<p><label for="<?php echo esc_attr($this->get_field_id('title')); ?>"><?php esc_attr_e('Title:', 'pressbooks-aldine'); ?></label>
<input class="widefat" id="<?php echo esc_attr($this->get_field_id('title')); ?>" name="<?php echo esc_attr($this->get_field_name('title')); ?>" type="text" value="<?php echo esc_attr($title); ?>"></p>
<p><label for="<?php echo esc_attr($this->get_field_id('page_id')); ?>"><?php esc_attr_e('Page:', 'pressbooks-aldine'); ?></label>
<select id="<?php echo esc_attr($this->get_field_id('page_id')); ?>" name="<?php echo esc_attr($this->get_field_name('page_id')); ?>">
<option value="" <?php selected($instance['page_id'], ''); ?>> -- </a>
<?php $pages = get_pages();
foreach ($pages as $page) { ?>
<option value="<?= $page->ID; ?>" <?php selected(@$instance['page_id'], $page->ID); ?>><?= $page->post_title; ?></option>
<?php } ?>
</select></p>
<?php
}
/**
* Sanitize widget form values as they are saved.
*
* @see WP_Widget::update()
*
* @param array $new_instance Values just sent to be saved.
* @param array $old_instance Previously saved values from database.
*
* @return array Updated safe values to be saved.
*/
public function update($new_instance, $old_instance)
{
$instance = [];
$instance['title'] = ( ! empty($new_instance['title']) ) ? strip_tags($new_instance['title']) : '';
$instance['page_id'] = ( ! empty($new_instance['page_id']) ) ? absint($new_instance['page_id']) : '';
return $instance;
}
}