jc youtube script - save playlist

Save playlist title to browser local storage
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// ==UserScript==
// @name       jc youtube script - save playlist
// @namespace  http://jc.at.home/
// @require    http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.11.1.min.js
// @match      http://www.youtube.com/playlist*
// @match      https://www.youtube.com/playlist*
// @include http://www.youtube.com/playlist*
// @include https://www.youtube.com/playlist*
// @description  Save playlist title to browser local storage
// @version    2014.08.09.23h
// @copyright  2011+, You
// ==/UserScript==
 
 
(function($) {
    //GM_addStyle(".jc_url:visited { color: red !important; }");
    GM_addStyle("#divJcSavePlaylistArea {border:1px solid gray; position: fixed; right: 30px; top: 130px; width: 400px;}");
    GM_addStyle("#divJcMsg {border:1px solid blue; height:700px; overflow-y:auto; background-color:white;}");
    GM_addStyle(".jcItem { border:1px solid gray; margin-bottom:5px; }");
    
    var nowUrl = '';
    
    function getJcPlaylistId() {
        // 取得目前的 Playlist Id
        var aurl = location.href;
        
        if (aurl.indexOf('playlist?')==-1) {
            listId = '';
        } else {
            var r = new RegExp('list=(.*?)(&|$)' , '');
            var listId = r.exec(aurl)[1];
            
            aurl = null;
            r = null;
        }
        return (listId);
    }
    
    function doJcLoadVideos() {
        // 載入已儲存的標題
        var listId = getJcPlaylistId();
        
        if (''==listId) {
            $('#divJcSavePlaylistArea').hide();
        } else {
            $('#divJcSavePlaylistArea').show();
            $('#divJcMsg').html( 'Load Playlist Id = ' + listId + '<hr />' + localStorage.getItem('jc_youtube_playlist_' + listId));
            
            listId = null;
    
            nowUrl = location.href;        
            // console.log('exec doJcLoadVideos()');
        }
        
        window.setTimeout(function() {
            doJcClickLoadMoreBtn();
        },2000);
    }
    
    function doJcSaveVideos() {
        // 儲存影片標題至 Browser Local Storage
        var yVideos = [];
        $('.pl-video-title-link').each(function() {
            var atitle = $.trim($(this).text());
            yVideos.push(atitle);
        });
        var astr = yVideos.join(',,,,,');
        
        var listId = getJcPlaylistId();
        
        localStorage.setItem('jc_youtube_playlist_' + listId , astr);
        $('#divJcMsg').html( 'Playlist Id = ' + listId + '<hr />' + astr );
        
        listId = null;
        yVideos = null;
        atitle = null;
        astr = null;
    }
    function doJcCheckVideos() {
        // 檢查哪些影片不存在 或 重複
        var listId = getJcPlaylistId();
        
        var videosStr = localStorage.getItem('jc_youtube_playlist_' + listId);
        var videosStrLen = parseInt(videosStr.length / 1024 , 10) + ' KB';
        $('#spanJcSavePlaylistDataSize').text(videosStrLen);
        var videosArr = videosStr.split(',,,,,');
        
        var atitle;
        var btitle;
        var surl;
        var bArr = [];
        var video_link_class = '.pl-video-title-link';
        
        $(video_link_class).each(function() {
            var atitle = $.trim($(this).text());
            bArr[atitle] = '1';
        });
        
        $('#divJcMsg').html('');
        
        for (video in videosArr) {
            btitle = videosArr[video];
            if (undefined == bArr[btitle]) {
                surl = 'http://www.youtube.com/results?search_query=' + encodeURIComponent(btitle);
                $('#divJcMsg').append('<div class="jcItem">' + btitle + ' : Not Exists! ' + ' <a target="_blank" href="' + surl + '">Search</a>' + '</div>');
            }
        } // for
        video = null;
        
        var cArr = [];
        for (video in videosArr) {
            btitle = videosArr[video];
            cArr[btitle] = '2';
        }
        
        $('#divJcMsg').append('<hr />');
        $(video_link_class).each(function() {
            var atitle = $.trim($(this).text());
            if (undefined == cArr[atitle]) {
                //surl = 'http://www.youtube.com/results?search_query=' + encodeURIComponent(btitle);
                $('#divJcMsg').append('<div class="jcItem">' + atitle + ' : Not Save! </div>');
            }
        });
        
        
        //$('#divJcMsg').html( bArr.join('<br />') );
        
        surl = null;
        atitle = null;
        btitle = null;
        listId = null;
        videosArr = null;
        videosStr = null;
        cArr = null;
        bArr = null;
    }
    function doJcAddSavePlaylistBtn() {
        $('body').append('<div id="divJcSavePlaylistArea">'+
                         '<div><input type="button" id="btnJcMax" value="放大" /><input type="button" id="btnJcMin" value="縮小" /></div>'+
                         '<div id="divJcSavePlaylistBtns2Area"><input type="button" id="btnJcSave" value="Save To Local Storage" />' +
                         '<input type="button" id="btnJcCheck" value="Check deleted videos" /><span id="spanJcSavePlaylistDataSize">--- KB</span></div>' + 
                         '<div id="divJcMsg"></div></div>');
        
        
        $('#btnJcSave').click(function() {
            // 儲存影片標題至 Browser Local Storage
            doJcSaveVideos();
        });
        
        $('#btnJcCheck').click(function() {
            // 檢查哪些影片不存在 或 重複
            doJcCheckVideos();
        });
        
        $('#btnJcMax').on('click', function() {
            $('#divJcMsg').show();
            $('#divJcSavePlaylistBtns2Area').show();
        });
        
        $('#btnJcMin').on('click', function() {
            $('#divJcMsg').hide();
            $('#divJcSavePlaylistBtns2Area').hide();
        });
        
        
        // 載入已儲存的標題
        doJcLoadVideos();
        
    }
    
    function doJcClickLoadMoreBtn() {
        // Click LoadMore Button
        if ($('button.load-more-button').length>0) {
            $('button.load-more-button').eq(0).trigger('click');
        }
    }
    
    $(document).ready(function() {
        
        window.setTimeout(function() {
            doJcAddSavePlaylistBtn();
        } , 200);
        
        window.setInterval(function() {
            if (nowUrl != location.href) {
                doJcLoadVideos();
            }
        },5000);
        
        
        
    });
    
})(jQuery);