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( function () { /** * @param {HTMLElement} element * @return {void} */ function loadGraphElement( element ) { if ( !element.classList.contains( 'mw-graph-clickable' ) ) { return; } element.classList.remove( 'mw-graph-clickable' ); element.classList.add( 'mw-graph-clickable-loading' ); mw.loader.using( 'ext.graph.render' ).then( ( require ) => { require( 'ext.graph.render' ).loadGraph( element ).then( () => { element.classList.remove( 'mw-graph-clickable-loading' ); }, ( e ) => { element.classList.remove( 'mw-graph-clickable-loading' ); element.classList.add( 'mw-graph-clickable-error' ); mw.log.error( `Error loading graph with data-graph-id=${ e.graphId }`, e.exception ); mw.errorLogger.logError( e.exception, 'error.graph' ); } ); } ); } /** * @param {Event} ev */ function loadGraph( ev ) { loadGraphElement( ev.target ); } /** * Wires up graph interactivity which occurs when the graphs are * clicked or scrolled into view. */ function lazyLoader() { $( document ).on( 'click', '.mw-graph-clickable', loadGraph ); // Load graphs as they scroll into view for browsers that support it. if ( 'IntersectionObserver' in window ) { const observer = new IntersectionObserver( ( entries ) => { entries.forEach( ( entry ) => { const element = entry.target; // If intersecting load image and stop observing it to free up resources. if ( entry.isIntersecting ) { loadGraphElement( element ); observer.unobserve( element ); } } ); }, // See https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API { // Setup the area for observing. // By default the root is the viewport. // We want the detection area to be as tall as 150% of the viewport height, // allowing elements to be detected before they reach the viewport. // This is achieved with a 50% bottom margin. rootMargin: '0px 0px 50% 0px', // The default is 0 (meaning as soon as even one pixel is visible, // the callback will be run), however we explicitly set this so that // it is clear we have made this choice in case we want to revisit later. threshold: 0 } ); // observe all the placeholders document.querySelectorAll( '.mw-graph-clickable' ).forEach( ( placeholder ) => { observer.observe( placeholder ); } ); } } mw.hook( 'wikipage.content' ).add( lazyLoader ); }() );
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