User:enterprisey Parsoid-jump.js

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This user script seems to have a documentation page at User:Enterprisey/parsoid-jump.

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( function () {

    var queryString = window.location.search,

        targetIdMatch = /[?&]parsoid_jump=(.+?)($|&)/.exec( queryString ),

        targetId = null;

    if( targetIdMatch ) {

        targetId = targetIdMatch1];

    } else if( document.cookie.indexOf( "parsoid_jump=" ) >= 0 ) {

        targetId = /parsoid_jump=([^;]+)/.exec( document.cookie )[1];

        document.cookie = "parsoid_jump=; expires=Thu, 01 Jan 1970 00:00:01 GMT";

    } else {

        return;

    }



    var liveTarget = document.getElementById( targetId );

    if( liveTarget ) {

        liveTarget.scrollIntoView();

        return;

    }



    mw.notify( "Jumping to the new content..." );



    var CONTENT_SLICE_LEN = 20,

        parsoidEndpoint = "https:" + mw.config.get( "wgServer" ) +

        "/api/rest_v1/page/html/",

        parsoidUrl = parsoidEndpoint + encodeURIComponent( mw.config.get( "wgPageName" ) ) +

        "/" + mw.config.get( "wgCurRevisionId" );

    $.get( parsoidUrl ).then( function ( domString ) {

        var domParser = new DOMParser(),

            dom = domParser.parseFromString( domString, "text/html" ),

            target = dom.getElementById( targetId );

        if( !target ) {

            console.error( "[parsoid-jump] Couldn't locate element with ID " +

                targetId + " in " + parsoidUrl );

            return;

        }



        var tag = target.tagName.toLowerCase(),

            classesSelector = target.className ? "." +

            Array.prototype.join.call( target.classList, "." ) : "",

            fullSelector = tag + classesSelector,

            partialContent = target.textContent.slice(0, CONTENT_SLICE_LEN),

            hasSimilarContent = function ( el ) {

                return el.textContent.slice( 0, CONTENT_SLICE_LEN ) === partialContent;

            },



            // Neat trick from https://medium.com/@chuckdries/traversing-the-dom-with-filter-map-and-arrow-functions-1417d326d2bc

        similarEls = Array.prototype.filter.call( dom.querySelectorAll( fullSelector ),

            hasSimilarContent ),

            targetIdx = similarEls.indexOf( target );



        // Now, try to find the element in the live DOM

        var liveSimilarEls = Array.prototype.filter.call( document.querySelectorAll( fullSelector ),

            hasSimilarContent );

        if( !liveSimilarEls ) {

            console.error( "[parsoid-jump] Couldn't locate any live elements with tag " +

                tag + " and partial content " + partialContent );

            return;

        }



        var liveEl = liveSimilarElstargetIdx];

        if( !liveEl ) {

            console.error( "[parsoid-jump] Tried to get the live similar element at index " +

                targetIdx + ", but there were only " + liveSimilarEls.length + " of them" );

            return;

        }



        liveEl.scrollIntoView();

        if( !window.parsoidJumpNoHighlight ) {

            mw.loader.addStyleTag( "@keyframes highlight { from { background-color: #ffb; } to { background-color: transparent; } } .psj-highlight { animation: highlight 2s; }" );

            liveEl.className += " psj-highlight";

        }

    } );

} )();