Sorting feature for VK playlist.

vk_playlist_sort.js

(function (paramsMap) {

    function loadScript(url, callback) {

        var script = document.createElement("script")
        script.type = "text/javascript";

        if (script.readyState) { //IE
            script.onreadystatechange = function () {
                if (script.readyState == "loaded" || script.readyState == "complete") {
                    script.onreadystatechange = null;
                    callback();
                }
            };
        } else { //Others
            script.onload = function () {
                callback();
            };
        }

        script.src = url;
        document.getElementsByTagName("head")[0].appendChild(script);
    }

    function naturalSort(a, b) {
        try {
            return +/\d+/.exec(a)[0] - +/\d+/.exec(b)[0];
        } catch (e) {
            return a.localeCompare(b);
        }
    }

    function sortPlayList(jQuery) {
        var edit_attrs = jQuery(".audio_pl_snippet__action_btn_edit").first().attr('onclick').split('(').slice(-1).pop().split(', ');

        var owner_id = window.vk.id;
        var playlist_id = edit_attrs[1];

        var getParams = {
            owner_id: owner_id, playlist_id: playlist_id,
            access_hash: null, act: 'load_section', al: 1, claim: 0, is_loading_all: 1, offset: 0, type: 'playlist'
        };
        jQuery.post('https://vk.com/al_audio.php', getParams,
            data => {
                var jsonStr = data.split('<!json>').slice(1, 2).pop().split('<!>').shift();
                var playlist = JSON.parse(jsonStr);

                var trackList = playlist.list;

                trackList.sort((a, b) => {
                    var aText = a[3];
                    var bText = b[3];
                    return paramsMap.naturalSort ? naturalSort(aText, bText) : aText.localeCompare(bText);
                });

                console.log("Tracks sorted like: ");
                console.log(trackList.map(el => el[3]));

                if (paramsMap.dryRun) {
                    return;
                }

                var audio_ids = trackList.map(el => el[1] + "_" + el[0]);
                var updateParams = {
                    Audios: audio_ids.join(','), owner_id: owner_id, playlist_id: playlist_id,
                    act: 'save_playlist', al: 1, cover: 0,
                    description: playlist.description, hash: playlist.editHash, title: playlist.title
                }

                jQuery.post('https://vk.com/al_audio.php', updateParams,
                    () => console.log("Playlist was updated successfully"))
                    .fail(e => console.log("Playlist was not updated successfully, %s", e));

            }).fail(e => console.log("Error on loading the playlist, %s", e));

    }

    loadScript("https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js", function () {
        console.log('jQuery loaded');
        var jq = jQuery.noConflict();
        sortPlayList(jq);
    });

})({"naturalSort": true, "dryRun": true});

By default the script is executed in dryRun mode. Set the 2nd argument to false to do an actual update to your VK play list.

How to use it:

1. open a playlist
2. execute current gist in Developer's Console
3. refresh the page to check the updated order.