WordPress как на ладони
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функция не описана

WC_Admin_Taxonomies::add_category_fields() public WC 1.0

Category thumbnail fields.

Это метод класса: WC_Admin_Taxonomies{}

Хуков нет.

Возвращает

Null. Ничего.

Использование

$WC_Admin_Taxonomies = new WC_Admin_Taxonomies();
$WC_Admin_Taxonomies->add_category_fields();

Код WC_Admin_Taxonomies::add_category_fields() WC 4.5.2

woocommerce/includes/admin/class-wc-admin-taxonomies.php
<?php
public function add_category_fields() {
	?>
	<div class="form-field term-display-type-wrap">
		<label for="display_type"><?php esc_html_e( 'Display type', 'woocommerce' ); ?></label>
		<select id="display_type" name="display_type" class="postform">
			<option value=""><?php esc_html_e( 'Default', 'woocommerce' ); ?></option>
			<option value="products"><?php esc_html_e( 'Products', 'woocommerce' ); ?></option>
			<option value="subcategories"><?php esc_html_e( 'Subcategories', 'woocommerce' ); ?></option>
			<option value="both"><?php esc_html_e( 'Both', 'woocommerce' ); ?></option>
		</select>
	</div>
	<div class="form-field term-thumbnail-wrap">
		<label><?php esc_html_e( 'Thumbnail', 'woocommerce' ); ?></label>
		<div id="product_cat_thumbnail" style="float: left; margin-right: 10px;"><img src="<?php echo esc_url( wc_placeholder_img_src() ); ?>" width="60px" height="60px" /></div>
		<div style="line-height: 60px;">
			<input type="hidden" id="product_cat_thumbnail_id" name="product_cat_thumbnail_id" />
			<button type="button" class="upload_image_button button"><?php esc_html_e( 'Upload/Add image', 'woocommerce' ); ?></button>
			<button type="button" class="remove_image_button button"><?php esc_html_e( 'Remove image', 'woocommerce' ); ?></button>
		</div>
		<script type="text/javascript">

			// Only show the "remove image" button when needed
			if ( ! jQuery( '#product_cat_thumbnail_id' ).val() ) {
				jQuery( '.remove_image_button' ).hide();
			}

			// Uploading files
			var file_frame;

			jQuery( document ).on( 'click', '.upload_image_button', function( event ) {

				event.preventDefault();

				// If the media frame already exists, reopen it.
				if ( file_frame ) {
					file_frame.open();
					return;
				}

				// Create the media frame.
				file_frame = wp.media.frames.downloadable_file = wp.media({
					title: '<?php esc_html_e( 'Choose an image', 'woocommerce' ); ?>',
					button: {
						text: '<?php esc_html_e( 'Use image', 'woocommerce' ); ?>'
					},
					multiple: false
				});

				// When an image is selected, run a callback.
				file_frame.on( 'select', function() {
					var attachment           = file_frame.state().get( 'selection' ).first().toJSON();
					var attachment_thumbnail = attachment.sizes.thumbnail || attachment.sizes.full;

					jQuery( '#product_cat_thumbnail_id' ).val( attachment.id );
					jQuery( '#product_cat_thumbnail' ).find( 'img' ).attr( 'src', attachment_thumbnail.url );
					jQuery( '.remove_image_button' ).show();
				});

				// Finally, open the modal.
				file_frame.open();
			});

			jQuery( document ).on( 'click', '.remove_image_button', function() {
				jQuery( '#product_cat_thumbnail' ).find( 'img' ).attr( 'src', '<?php echo esc_js( wc_placeholder_img_src() ); ?>' );
				jQuery( '#product_cat_thumbnail_id' ).val( '' );
				jQuery( '.remove_image_button' ).hide();
				return false;
			});

			jQuery( document ).ajaxComplete( function( event, request, options ) {
				if ( request && 4 === request.readyState && 200 === request.status
					&& options.data && 0 <= options.data.indexOf( 'action=add-tag' ) ) {

					var res = wpAjax.parseAjaxResponse( request.responseXML, 'ajax-response' );
					if ( ! res || res.errors ) {
						return;
					}
					// Clear Thumbnail fields on submit
					jQuery( '#product_cat_thumbnail' ).find( 'img' ).attr( 'src', '<?php echo esc_js( wc_placeholder_img_src() ); ?>' );
					jQuery( '#product_cat_thumbnail_id' ).val( '' );
					jQuery( '.remove_image_button' ).hide();
					// Clear Display type field on submit
					jQuery( '#display_type' ).val( '' );
					return;
				}
			} );

		</script>
		<div class="clear"></div>
	</div>
	<?php
}