Merge pull request #548 from contactashish13/issue-399

add schema support for dataset

Author: contactashish13

classes/Visualizer/Module/Frontend.php

@@ -344,6 +344,55 @@ public function renderChart( $atts ) {
 		}
 
 		// return placeholder div
-		return $actions_div . '<div id="' . $id . '"' . $class . '></div>';
+		return $actions_div . '<div id="' . $id . '"' . $class . '></div>' . $this->addSchema( $chart->ID );
+	}
+
+	/**
+	 * Adds the schema corresponding to the dataset.
+	 *
+	 * @since 3.3.2
+	 *
+	 * @access private
+	 */
+	private function addSchema( $id ) {
+		$settings = get_post_meta( $id, Visualizer_Plugin::CF_SETTINGS, true );
+		$title = '';
+		if ( isset( $settings['title'] ) && ! empty( $settings['title'] ) ) {
+			$title  = $settings['title'];
+			if ( is_array( $title ) ) {
+				$title  = $settings['title']['text'];
+			}
+		}
+		$title = apply_filters( 'visualizer_schema_name', $title, $id );
+		if ( empty( $title ) ) {
+			return '';
+		}
+
+		$desc = '';
+		if ( isset( $settings['description'] ) && ! empty( $settings['description'] ) ) {
+			$desc  = $settings['description'];
+		}
+		$desc = apply_filters( 'visualizer_schema_description', $desc, $id );
+		// descriptions below 50 chars are not allowed.
+		if ( empty( $desc ) || strlen( $desc ) < 50 ) {
+			return '';
+		}
+
+		$schema = apply_filters(
+			'visualizer_schema',
+			'{
+			  "@context":"https://schema.org/",
+			  "@type":"Dataset",
+			  "name":"' . esc_html( $title ) . '",
+			  "description":"' . esc_html( $desc ) . '"
+			}',
+			$id
+		);
+
+		if ( empty( $schema ) ) {
+			return '';
+		}
+
+		return '<script type="application/ld+json">' . $schema . '</script>';
 	}
 }

classes/Visualizer/Render/Sidebar/ChartJS.php

@@ -161,6 +161,15 @@ protected function _renderChartTitleSettings() {
 			'#000'
 		);
 
+		echo '<div class="viz-section-delimiter"></div>';
+
+		self::_renderTextAreaItem(
+			esc_html__( 'Chart Description', 'visualizer' ),
+			'description',
+			$this->description,
+			sprintf( esc_html__( 'Description to display in the structured data schema as explained %1$shere%2$s', 'visualizer' ), '<a href="https://developers.google.com/search/docs/data-types/dataset#dataset" target="_blank">', '</a>' )
+		);
+
 	}
 
 	/**

classes/Visualizer/Render/Sidebar/Graph.php

@@ -122,6 +122,16 @@ protected function _renderChartTitleSettings() {
 			$this->_positions,
 			esc_html__( 'Determines where to place the axis titles, compared to the chart area.', 'visualizer' )
 		);
+
+		echo '<div class="viz-section-delimiter"></div>';
+
+		self::_renderTextAreaItem(
+			esc_html__( 'Chart Description', 'visualizer' ),
+			'description',
+			$this->description,
+			sprintf( esc_html__( 'Description to display in the structured data schema as explained %1$shere%2$s', 'visualizer' ), '<a href="https://developers.google.com/search/docs/data-types/dataset#dataset" target="_blank">', '</a>' )
+		);
+
 	}
 
 	/**

classes/Visualizer/Render/Sidebar/Type/DataTable/DataTable.php

@@ -136,6 +136,16 @@ protected function _renderGeneralSettings() {
 					$this->title,
 					esc_html__( 'Text to display in the back-end admin area.', 'visualizer' )
 				);
+
+				echo '<div class="viz-section-delimiter"></div>';
+
+				self::_renderTextAreaItem(
+					esc_html__( 'Chart Description', 'visualizer' ),
+					'description',
+					$this->description,
+					sprintf( esc_html__( 'Description to display in the structured data schema as explained %1$shere%2$s', 'visualizer' ), '<a href="https://developers.google.com/search/docs/data-types/dataset#dataset" target="_blank">', '</a>' )
+				);
+
 			self::_renderSectionEnd();
 		self::_renderGroupEnd();
 	}