User:Fred Gandt/sectionLinks.js

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This code will be executed when previewing this page.

Documentation for this user script can be added at User:Fred Gandt/sectionLinks. This user script seems to have an accompanying .css page at User:Fred Gandt/sectionLinks.css.

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$( document ).ready( () => {
	
	// TODO while previewing etc. or on every page?
	
    const SCTNS = Array.from( document.querySelectorAll( "span.mw-headline" ) );
    if ( SCTNS && SCTNS.length ) {
    	mw.loader.load( "/w/index.php?title=User:Fred_Gandt/sectionLinks.css&action=raw&ctype=text/css", "text/css" );
    	const CNS = mw.config.get( "wgCanonicalNamespace" ),
    		PN = mw.config.get( "wgPageName" ),
        	TTL = mw.config.get( "wgTitle" ),
    		CCNS = CNS ? `${CNS}:` : "",
        	LO = location.origin,
        	cycleSectionLinks = function( evt ) {
				evt.preventDefault();
				let i = this.sectionLinks.indexOf( this.textContent ) + ( evt.deltaY > 0 ? 1 : -1 );
				this.textContent = this.sectionLinks[ i > 3 ? 0 : ( i < 0 ? 3 : i ) ];
			};
    	let stc;
    	SCTNS.forEach( h => {
        	stc = h.textContent;
			h.sectionLinks = [
		    	stc,
				`[[${CCNS}${TTL}#${stc}|]]`,
            	`{{section link|${CCNS}${TTL}|${stc}}}`,
				`${LO}/wiki/${PN}#${mw.util.wikiUrlencode( stc )}`
			];
			h.addEventListener( "wheel", cycleSectionLinks );
		} );
    }
} );