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<?php |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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// Fetch the post meta once, each get_post_meta() call re-runs the full defaults + filter pipeline |
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$post_meta = m_chart()->get_post_meta( $post_id ); |
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|
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$title = get_the_title( $post_id ); |
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$height = $post_meta['height']; |
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$subtitle = $post_meta['subtitle']; |
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|
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if ( '' != $subtitle ) { |
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$title = $title . ': ' . $subtitle; |
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} |
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|
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$width = ( '' !== $args['width'] && 'responsive' !== $args['width'] ) |
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? absint( $args['width'] ) |
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: 0; |
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|
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$defer_rendering = 'enabled' === m_chart()->get_settings( 'defer_rendering' ); |
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$observer_options = apply_filters( |
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'm_chart_defer_rendering_observer_options', |
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[ 'rootMargin' => '100px', 'threshold' => 0 ], |
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$post_id, |
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$args |
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); |
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|
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$container_id = 'm-chart-container-' . absint( $post_id ) . '-' . absint( $this->instance ); |
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$canvas_id = 'm-chart-' . absint( $post_id ) . '-' . absint( $this->instance ); |
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$caption_id = $canvas_id . '-caption'; |
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$summary_id = $canvas_id . '-summary'; |
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$desc_id = $canvas_id . '-desc'; |
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|
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// The canvas's accessible description is a short summary rather than the whole data table |
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// The full table is associated via aria-details so AT users can navigate it as a real table |
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|
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// Prefer the chart's excerpt as a human-written summary |
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// Read the raw excerpt field rather than get_the_excerpt() |
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// So an empty field is not auto-generated from post content |
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$summary = trim( wp_strip_all_tags( strip_shortcodes( (string) get_post_field( 'post_excerpt', $post_id ) ) ) ); |
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|
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$source_name = trim( (string) $post_meta['source'] ); |
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$source_url = trim( (string) $post_meta['source_url'] ); |
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$show_source = $post_meta['include_source'] && '' !== $source_name; |
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|
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if ( '' === $summary ) { |
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// No excerpt so generate one: chart type + subtitle + source + what follows |
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// The title is left out since it's already the canvas's accessible name via the figcaption |
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// Escaping happens once at output so the pieces stay plain text here |
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// translators: %s is the chart type (line, bar, pie, etc) |
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$summary = sprintf( __( '%s chart.', 'm-chart' ), ucwords( str_replace( '-', ' ', $post_meta['type'] ) ) ); |
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|
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if ( '' != $subtitle ) { |
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$summary .= ' ' . trim( (string) $subtitle ) . '.'; |
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} |
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|
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if ( $show_source ) { |
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// translators: %s is the chart's data source name |
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$summary .= ' ' . sprintf( __( 'Source: %s.', 'm-chart' ), $source_name ); |
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} |
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|
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// Describe the data table(s) that hold the chart's values |
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// Row/column counts come from the first sheet's populated cells |
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$sets = isset( $post_meta['data']['sets'] ) ? (array) $post_meta['data']['sets'] : []; |
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$set_count = count( $sets ); |
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|
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if ( 1 < $set_count ) { |
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// translators: %d is the number of data tables |
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$summary .= ' ' . sprintf( __( '%d data tables follow.', 'm-chart' ), $set_count ); |
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} else { |
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$row_count = 0; |
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$col_count = 0; |
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|
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foreach ( (array) reset( $sets ) as $row ) { |
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$row_width = 0; |
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|
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foreach ( array_values( (array) $row ) as $column => $cell ) { |
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if ( '' !== trim( (string) $cell ) ) { |
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$row_width = $column + 1; |
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} |
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} |
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|
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if ( $row_width ) { |
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$row_count++; |
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$col_count = max( $col_count, $row_width ); |
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} |
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} |
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|
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if ( $row_count ) { |
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// translators: 1: number of rows 2: number of columns |
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$summary .= ' ' . sprintf( __( 'Data table with %1$d rows and %2$d columns follows.', 'm-chart' ), $row_count, $col_count ); |
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} |
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} |
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} |
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?> |
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<figure id="<?php echo esc_attr( $container_id ); ?>" class="m-chart-container chartjs"> |
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<canvas id="<?php echo esc_attr( $canvas_id ); ?>" class="m-chart" height="<?php echo absint( $height ); ?>"<?php echo $width ? ' width="' . absint( $width ) . '"' : ''; ?> role="img" aria-labelledby="<?php echo esc_attr( $caption_id ); ?>" aria-describedby="<?php echo esc_attr( $summary_id ); ?>" aria-details="<?php echo esc_attr( $desc_id ); ?>" style="height: <?php echo esc_attr( $height ); ?>px; max-width: 100%;"> |
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<p><?php echo esc_html( $title ); ?></p> |
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</canvas> |
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<figcaption id="<?php echo esc_attr( $caption_id ); ?>" class="screen-reader-text"> |
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<?php echo esc_html( $title ); ?> |
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</figcaption> |
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<p id="<?php echo esc_attr( $summary_id ); ?>" class="m-chart-summary screen-reader-text"> |
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<?php echo esc_html( $summary ); ?> |
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</p> |
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<div id="<?php echo esc_attr( $desc_id ); ?>" class="screen-reader-text"> |
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<?php |
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// Render the data table(s) as an accessible description for screen-reader users. |
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// build_table() handles multi-sheet, parse_data, and template inclusion. |
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echo m_chart()->build_table( $post_id ); |
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|
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/** |
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* Fires inside the screen-reader-only context container after the data table. |
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* |
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* Use this to append additional context (data sources, methodology, |
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* trend descriptions, summary text) that helps screen-reader users |
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* understand the chart beyond the raw data values. |
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* |
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* @param int $post_id The chart post ID |
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* @param array $args The chart shortcode args |
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*/ |
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do_action( 'm_chart_screen_reader_text', $post_id, $args ); |
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?> |
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</div> |
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<?php if ( $show_source ) { ?> |
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<p class="m-chart-source screen-reader-text"> |
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<?php |
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// The visual source attribution is painted on the canvas by the helper plugin |
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// This makes it invisible to AT and its click target is mouse-only |
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// So this is the operable version for keyboard and screen-reader users |
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// The paragraph un-hides while the link has focus so sighted keyboard users can see it |
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esc_html_e( 'Source:', 'm-chart' ); |
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|
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if ( '' !== $source_url ) { |
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?> |
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<a href="<?php echo esc_url( $source_url ); ?>"><?php echo esc_html( $source_name ); ?></a> |
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<?php |
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} else { |
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echo ' ' . esc_html( $source_name ); |
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} |
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?> |
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</p> |
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<?php } ?> |
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</figure> |
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<?php |
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// Inside iframe.php the M_Chart instance has a CSP nonce set; outside (front-end / admin preview) it's empty |
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// The inline <script> needs a matching nonce ONLY when rendered inside the CSP-protected iframe |
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$iframe_nonce = m_chart()->iframe_csp_nonce ?? ''; |
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?> |
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<script<?php echo $iframe_nonce ? ' nonce="' . esc_attr( $iframe_nonce ) . '"' : ''; ?>> |
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( () => { |
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const postId = <?php echo absint( $post_id ); ?>; |
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const instance = <?php echo absint( $this->instance ); ?>; |
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const chartArgs = <?php echo json_encode( $this->library( 'chartjs' )->get_chart_args( $post_id, $args ), JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT ); ?>; |
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const canvas = document.getElementById( 'm-chart-' + postId + '-' + instance ).getContext( '2d' ); |
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<?php do_action( 'm_chart_after_chart_args', $post_id, $args, $this->instance ); ?> |
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|
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let rendered = false; |
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|
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const onComplete = () => { |
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// Guard against Chart.js firing onComplete multiple times (observed in 3.1.0) |
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if ( rendered ) { |
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return; |
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} |
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|
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rendered = true; |
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|
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document.querySelectorAll( '.m-chart' ).forEach( el => { |
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// Build detail once so both dispatches carry identical data |
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const detail = { post_id: postId, instance }; |
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|
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// Canonical event name — matches the wp.hooks `m_chart.render_done` action on the admin side |
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// The chart instance type (Chart.js vs Highcharts) is identified by consumer context, not the event name |
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el.dispatchEvent( new CustomEvent( 'm_chart.render_done', { |
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bubbles: true, |
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detail, |
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} ) ); |
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|
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// Legacy name — deprecated, kept for one major version (planned removal in v3) |
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el.dispatchEvent( new CustomEvent( 'render_done', { |
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bubbles: true, |
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detail, |
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} ) ); |
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} ); |
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}; |
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|
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const reducedMotion = window.matchMedia |
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&& window.matchMedia( '(prefers-reduced-motion: reduce)' ).matches; |
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|
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chartArgs.options.animation = { |
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...chartArgs.options.animation, |
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// duration: 0 keeps animation lifecycle hooks (onComplete) working |
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// so render_done still fires, but eliminates the motion itself |
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...( reducedMotion ? { duration: 0 } : {} ), |
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onComplete, |
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}; |
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|
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const renderChart = () => { |
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new Chart( canvas, chartArgs ); |
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}; |
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|
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document.addEventListener( 'DOMContentLoaded', () => { |
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// Register the Chart.js plugins once per chart script rather than on every render |
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Chart.register( ChartDataLabels ); |
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Chart.register( MChartHelper ); |
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<?php do_action( 'm_chart_after_chartjs_plugins', $post_id, $args, $this->instance ); ?> |
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|
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const defer = <?php echo $defer_rendering ? 'true' : 'false'; ?>; |
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|
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if ( ! defer || ! ( 'IntersectionObserver' in window ) ) { |
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renderChart(); |
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return; |
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} |
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|
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const container = document.getElementById( 'm-chart-container-' + postId + '-' + instance ); |
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const observer = new IntersectionObserver( ( entries, obs ) => { |
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if ( entries[0].isIntersecting ) { |
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obs.disconnect(); |
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renderChart(); |
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} |
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}, <?php echo wp_json_encode( $observer_options ); ?> ); |
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|
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observer.observe( container ); |
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} ); |
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} )(); |
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</script> |
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|
