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(@devs121outsource)

In WordPress (Appearance > Widgets) widget section is not working.
I am getting Fatal error.

Fatal error: Uncaught Error: Call to a member function get_cart() on null
in /var/www/vhosts/localhost/html/public_html/wp-content/themes/satine/framework/modules/widgets/woocommerce-dropdown-cart/woocommerce-dropdown-cart.php on line 141

Call stack:

    SatineElatedWoocommerceDropdownCart::widget()
    wp-includes/class-wp-widget.php:393
    WP_Widget::display_callback()
    wp-includes/widgets.php:1977
    wp_render_widget()
    wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php:630
    WP_REST_Widgets_Controller::prepare_item_for_response()
    wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php:122
    WP_REST_Widgets_Controller::get_items()
    wp-includes/rest-api/class-wp-rest-server.php:1140
    WP_REST_Server::respond_to_request()
    wp-includes/rest-api/class-wp-rest-server.php:987
    WP_REST_Server::dispatch()
    wp-includes/rest-api.php:495
    rest_do_request()
    wp-includes/rest-api.php:2832
    rest_preload_api_request()
    array_reduce()
    wp-includes/block-editor.php:444
    block_editor_rest_api_preload()
    wp-admin/widgets-form-blocks.php:25
    require()
    wp-admin/widgets.php:31

I am using WordPress Version 5.8 & WooCommerce version: 5.5.1

Code of woocommerce-dropdown-cart.php

<?php

class SatineElatedWoocommerceDropdownCart extends WP_Widget
{
	public function __construct()
	{
		parent::__construct(
			'eltdf_woocommerce_dropdown_cart',
			esc_html__('Elated Woocommerce Dropdown Cart', 'satine'),
			array('description' => esc_html__('Display a shop cart icon with a dropdown that shows products that are in the cart', 'satine'),)
		);

		$this->setParams();
	}

	protected function setParams()
	{

		$this->params = array(
			array(
				'type' => 'textfield',
				'name' => 'woocommerce_dropdown_cart_margin',
				'title' => esc_html__('Icon Margin', 'satine'),
				'description' => esc_html__('Insert margin in format: top right bottom left (e.g. 10px 5px 10px 5px)', 'satine')
			),
			array(
				'type' => 'dropdown',
				'name' => 'woocommerce_enable_cart_info',
				'title' => esc_html__('Enable Cart Info', 'satine'),
				'options' => satine_elated_get_yes_no_select_array(false),
				'description' => esc_html__('Enabling this option will show cart info (products number and price) at the right side of dropdown cart icon', 'satine')
			),
		);
	}

	/**
	 * Generate widget form based on $params attribute
	 *
	 * @param array $instance
	 *
	 * @return null
	 */
	public function form($instance)
	{
		if (is_array($this->params) && count($this->params)) {
			foreach ($this->params as $param_array) {
				$param_name = $param_array['name'];
				${$param_name} = isset($instance[$param_name]) ? esc_attr($instance[$param_name]) : '';
			}

			foreach ($this->params as $param) {
				switch ($param['type']) {
					case 'textfield':
						?>
						<p>
							<label for="<?php echo esc_attr($this->get_field_id($param['name'])); ?>"><?php echo
								esc_html($param['title']); ?>:</label>
							<input class="widefat" id="<?php echo esc_attr($this->get_field_id($param['name'])); ?>"
								   name="<?php echo esc_attr($this->get_field_name($param['name'])); ?>" type="text"
								   value="<?php echo esc_attr(${$param['name']}); ?>"/>
							<?php if (!empty($param['description'])) : ?>
								<span class="eltdf-field-description"><?php echo esc_html($param['description']); ?></span>
							<?php endif; ?>
						</p>
						<?php
						break;
					case 'dropdown':
						?>
						<p>
							<label for="<?php echo esc_attr($this->get_field_id($param['name'])); ?>"><?php echo
								esc_html($param['title']); ?>:</label>
							<?php if (isset($param['options']) && is_array($param['options']) && count($param['options'])) { ?>
								<select class="widefat"
										name="<?php echo esc_attr($this->get_field_name($param['name'])); ?>"
										id="<?php echo esc_attr($this->get_field_id($param['name'])); ?>">
									<?php foreach ($param['options'] as $param_option_key => $param_option_val) {
										$option_selected = '';
										if (${$param['name']} == $param_option_key) {
											$option_selected = 'selected';
										}
										?>
										<option <?php echo esc_attr($option_selected); ?>
												value="<?php echo esc_attr($param_option_key); ?>"><?php echo esc_attr($param_option_val); ?></option>
									<?php } ?>
								</select>
							<?php } ?>
							<?php if (!empty($param['description'])) : ?>
								<span class="eltdf-field-description"><?php echo esc_html($param['description']); ?></span>
							<?php endif; ?>
						</p>

						<?php
						break;
				}
			}
		} else { ?>
			<p><?php esc_html_e('There are no options for this widget.', 'satine'); ?></p>
		<?php }
	}

	/**
	 * @param array $new_instance
	 * @param array $old_instance
	 *
	 * @return array
	 */
	public function update($new_instance, $old_instance)
	{
		$instance = array();
		foreach ($this->params as $param) {
			$param_name = $param['name'];

			$instance[$param_name] = sanitize_text_field($new_instance[$param_name]);
		}

		return $instance;
	}

	public function widget($args, $instance)
	{
		extract($args);

		global $woocommerce;

		$icon_styles = array();

		if ($instance['woocommerce_dropdown_cart_margin'] !== '') {
			$icon_styles[] = 'padding: ' . $instance['woocommerce_dropdown_cart_margin'];
		}

		$icon_class = 'eltdf-cart-info-is-disabled';

		if (!empty($instance['woocommerce_enable_cart_info']) && $instance['woocommerce_enable_cart_info'] === 'yes') {
			$icon_class = 'eltdf-cart-info-is-active';
		}

		$cart_description = satine_elated_options()->getOptionValue('eltdf_woo_dropdown_cart_description');
		?>
		<div class="eltdf-shopping-cart-holder <?php echo esc_html($icon_class); ?>" <?php satine_elated_inline_style($icon_styles) ?>>
			<div class="eltdf-shopping-cart-inner">
				<?php $cart_is_empty = sizeof($woocommerce->cart->get_cart()) <= 0; ?>
				<a itemprop="url" class="eltdf-header-cart" href="<?php echo wc_get_cart_url(); ?>">
					<span class="eltdf-cart-icon icon-ecommerce-bag"></span>
					<span class="eltdf-cart-count"><?php echo esc_html($woocommerce->cart->cart_contents_count); ?></span>
					<span class="eltdf-cart-info">
						<span class="eltdf-cart-info-total"><?php echo '(' . wp_kses($woocommerce->cart->get_cart_subtotal(), array('span' => array('class' => true, 'id' => true))) . ')'; ?></span>
					</span>
				</a>
				<?php if (!$cart_is_empty) : ?>
					<div class="eltdf-shopping-cart-dropdown">
						<ul>
							<?php foreach ($woocommerce->cart->get_cart() as $cart_item_key => $cart_item) :
								$_product = $cart_item['data'];
								// Only display if allowed
								if (!$_product->exists() || $cart_item['quantity'] == 0) {
									continue;
								}
								// Get price
								if (version_compare(WOOCOMMERCE_VERSION, '3.0') >= 0) {
									$product_price = get_option('woocommerce_tax_display_cart') == 'excl' ? wc_get_price_excluding_tax($_product) : wc_get_price_including_tax($_product);
								} else {
									$product_price = get_option('woocommerce_tax_display_cart') == 'excl' ? $_product->get_price_excluding_tax() : $_product->get_price_including_tax();
								}
								?>
								<li>
									<div class="eltdf-item-image-holder">
										<a itemprop="url"
										   href="<?php echo esc_url(get_permalink($cart_item['product_id'])); ?>">
											<?php echo wp_kses($_product->get_image(), array(
												'img' => array(
													'src' => true,
													'width' => true,
													'height' => true,
													'class' => true,
													'alt' => true,
													'title' => true,
													'id' => true
												)
											)); ?>
										</a>
									</div>
									<div class="eltdf-item-info-holder">
										<h5 itemprop="name" class="eltdf-product-title"><a itemprop="url"
																						   href="<?php echo esc_url(get_permalink($cart_item['product_id'])); ?>"><?php echo apply_filters('satine_elated_woo_widget_cart_product_title', $_product->get_title(), $_product); ?></a>
										</h5>
										<span class="eltdf-quantity"><?php echo esc_html($cart_item['quantity']); ?></span>
										<?php echo apply_filters('satine_elated_woo_cart_item_price_html', wc_price($product_price), $cart_item, $cart_item_key); ?>
										<?php echo apply_filters('satine_elated_woo_cart_item_remove_link', sprintf('<a href="%s" class="remove" title="%s"><span class="icon-arrows-remove"></span></a>', esc_url(wc_get_cart_remove_url($cart_item_key)), esc_html__('Remove this item', 'satine')), $cart_item_key); ?>
									</div>
								</li>
							<?php endforeach; ?>
							<div class="eltdf-cart-bottom">
								<div class="eltdf-subtotal-holder clearfix">
									<span class="eltdf-total"><?php esc_html_e('TOTAL:', 'satine'); ?></span>
									<span class="eltdf-total-amount">
										<?php echo wp_kses($woocommerce->cart->get_cart_subtotal(), array(
											'span' => array(
												'class' => true,
												'id' => true
											)
										)); ?>
									</span>
								</div>
								<?php if (!empty($cart_description)) { ?>
									<div class="eltdf-cart-description">
										<div class="eltdf-cart-description-inner">
											<span><?php echo esc_html($cart_description); ?></span>
										</div>
									</div>
								<?php } ?>
								<div class="eltdf-btn-holder clearfix">
									<a itemprop="url" href="<?php echo wc_get_cart_url(); ?>"
									   class="eltdf-view-cart"
									   data-title="<?php esc_attr_e('VIEW CART', 'satine'); ?>"><span><?php esc_html_e('VIEW CART', 'satine'); ?></span></a>
								</div>
								<div class="eltdf-btn-holder clearfix">
									<a itemprop="url" href="<?php echo wc_get_checkout_url(); ?>"
									   class="eltdf-view-cart"
									   data-title="<?php esc_attr_e('CHECKOUT', 'satine'); ?>"><span><?php esc_html_e('CHECKOUT', 'satine'); ?></span></a>
								</div>
							</div>
						</ul>
					</div>
				<?php else : ?>
					<div class="eltdf-shopping-cart-dropdown">
						<ul>
							<li class="eltdf-empty-cart"><?php esc_html_e('No products in the cart.', 'satine'); ?></li>
						</ul>
					</div>
				<?php endif; ?>
			</div>
		</div>
		<?php
	}
}

if (version_compare(WOOCOMMERCE_VERSION, '3.0') >= 0) {
	add_filter('woocommerce_add_to_cart_fragments', 'satine_elated_woocommerce_header_add_to_cart_fragment');
} else {
	add_filter('add_to_cart_fragments', 'satine_elated_woocommerce_header_add_to_cart_fragment');
}

function satine_elated_woocommerce_header_add_to_cart_fragment($fragments)
{
	global $woocommerce;

	$cart_description = satine_elated_options()->getOptionValue('eltdf_woo_dropdown_cart_description');

	ob_start();

	?>

	<div class="eltdf-shopping-cart-inner">
		<?php $cart_is_empty = sizeof($woocommerce->cart->get_cart()) <= 0; ?>
		<a itemprop="url" class="eltdf-header-cart" href="<?php echo wc_get_cart_url(); ?>">
			<span class="eltdf-cart-icon icon-ecommerce-bag"></span>
			<span class="eltdf-cart-count"><?php echo esc_html($woocommerce->cart->cart_contents_count); ?></span>
			<span class="eltdf-cart-info">
				<span class="eltdf-cart-info-total"><?php echo '(' . wp_kses($woocommerce->cart->get_cart_subtotal(), array('span' => array('class' => true, 'id' => true))) . ')'; ?></span>
			</span>
		</a>
		<?php if (!$cart_is_empty) : ?>
			<div class="eltdf-shopping-cart-dropdown">
				<ul>
					<?php foreach ($woocommerce->cart->get_cart() as $cart_item_key => $cart_item) :
						$_product = $cart_item['data'];
						// Only display if allowed
						if (!$_product->exists() || $cart_item['quantity'] == 0) {
							continue;
						}
						// Get price
						$product_price = get_option('woocommerce_tax_display_cart') == 'excl' ? $_product->get_price_excluding_tax() : $_product->get_price_including_tax();
						?>
						<li>
							<div class="eltdf-item-image-holder">
								<a itemprop="url"
								   href="<?php echo esc_url(get_permalink($cart_item['product_id'])); ?>">
									<?php echo wp_kses($_product->get_image(), array(
										'img' => array(
											'src' => true,
											'width' => true,
											'height' => true,
											'class' => true,
											'alt' => true,
											'title' => true,
											'id' => true
										)
									)); ?>
								</a>
							</div>
							<div class="eltdf-item-info-holder">
								<h5 itemprop="name" class="eltdf-product-title"><a itemprop="url"
																				   href="<?php echo esc_url(get_permalink($cart_item['product_id'])); ?>"><?php echo apply_filters('satine_elated_woo_widget_cart_product_title', $_product->get_title(), $_product); ?></a>
								</h5>
								<span class="eltdf-quantity"><?php echo esc_html($cart_item['quantity']); ?></span>
								<?php echo apply_filters('satine_elated_woo_cart_item_price_html', wc_price($product_price), $cart_item, $cart_item_key); ?>
								<?php echo apply_filters('satine_elated_woo_cart_item_remove_link', sprintf('<a href="%s" class="remove" title="%s"><span class="icon-arrows-remove"></span></a>', esc_url(wc_get_cart_remove_url($cart_item_key)), esc_html__('Remove this item', 'satine')), $cart_item_key); ?>
							</div>
						</li>
					<?php endforeach; ?>
					<div class="eltdf-cart-bottom">
						<div class="eltdf-subtotal-holder clearfix">
							<span class="eltdf-total"><?php esc_html_e('TOTAL:', 'satine'); ?></span>
							<span class="eltdf-total-amount">
								<?php echo wp_kses($woocommerce->cart->get_cart_subtotal(), array(
									'span' => array(
										'class' => true,
										'id' => true
									)
								)); ?>
							</span>
						</div>
						<?php if (!empty($cart_description)) { ?>
							<div class="eltdf-cart-description">
								<div class="eltdf-cart-description-inner">
									<span><?php echo esc_html($cart_description); ?></span>
								</div>
							</div>
						<?php } ?>
						<div class="eltdf-btn-holder clearfix">
							<a itemprop="url" href="<?php echo wc_get_cart_url(); ?>" class="eltdf-view-cart"
							   data-title="<?php esc_attr_e('VIEW CART', 'satine'); ?>"><span><?php esc_html_e('VIEW CART', 'satine'); ?></span></a>
						</div>
						<div class="eltdf-btn-holder clearfix">
							<a itemprop="url" href="<?php echo wc_get_checkout_url(); ?>" class="eltdf-view-cart"
							   data-title="<?php esc_attr_e('CHECKOUT', 'satine'); ?>"><span><?php esc_html_e('CHECKOUT', 'satine'); ?></span></a>
						</div>
					</div>
				</ul>
			</div>
		<?php else : ?>
			<div class="eltdf-shopping-cart-dropdown">
				<ul>
					<li class="eltdf-empty-cart"><?php esc_html_e('No products in the cart.', 'satine'); ?></li>
				</ul>
			</div>
		<?php endif; ?>
	</div>

	<?php
	$fragments['div.eltdf-shopping-cart-inner'] = ob_get_clean();

	return $fragments;
}

?>

This topic was modified 3 years, 6 months ago by devs121outsource.
This topic was modified 3 years, 6 months ago by devs121outsource. Reason: Code of woocommerce-dropdown-cart.php

Viewing 4 replies - 1 through 4 (of 4 total)

Anonymous User 14808221
(@anonymized-14808221)

3 years, 6 months ago

Is this error happening in the actual backend?
Then that is because since WordPress 5.8, the Widget screen is not anymore the classic backend, and your code will try to execute, even if it is in the backend.

If any function you use (such as get_cart) is somehow designed to only work in the actual front end, then that might cause all sorts of errors.

The best quick check I have in mind would be to dump $woocommerce and check if it is an object and what it holds (it will probably not be an object, since you see an error stating that it tries to get function from null)

Then you can check if this widget does actually work in the front end. If it does, then you just need to fix the backend, thus, make sure you don’t load the code in the widget editor.

You probably have to ask someone who is using Gutenberg Widget Screen as a programmer about what exactly you need to do in order to exclude your code in the backend when using Gutenberg Widget Editor, because is_admin won’t do the trick anymore as it did before.

Maybe https://developer.www.ads-software.com/reference/classes/wp_screen/is_block_editor/ would help to detect if it is a Gutenberg Editor screen, then abort and do not execute the code, and if that returns false, you can combine this with is_admin and execute the code on the front end.

Thread Starter devs121outsource
(@devs121outsource)

3 years, 6 months ago

Thanks for Reply @bedas

Is this error happening in the actual backend?

Yes , I am getting this error in back end only.I am unable to use widgets.Everything is working fine in front site.

Anonymous User 14808221
(@anonymized-14808221)

3 years, 6 months ago

Yeah, I suspected that.
Check my previous reply, the reason and solution should be deducible from it.

There where massive changes in the WP 5.8 update which made it so that the Widget Screen uses Blocks now, and wherever you use blocks, “is_admin” is not true anymore. That means any code, literally any code that you put in your function will try to execute. And most of times, that is neither needed, nor a good idea, but it is just how it works.

You will have to put some conditional checks in your code to “not proceed” when on Gutenberg.
https://developer.www.ads-software.com/reference/classes/wp_screen/is_block_editor/ should help with this.

Thread Starter devs121outsource
(@devs121outsource)

3 years, 6 months ago

Hi @bedas

Thanks for reply

While Looking for the solution you mentioned, I found Classic Widgets plugin.

I hope this will be helpful.

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Widget not working : Fatal error: Uncaught Error: Call to a function get_cart()’ is closed to new replies.

Widget not working : Fatal error: Uncaught Error: Call to a function get_cart()

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