(function ($) {
    $.fn.extend({
        smartpaginator: function (options) {
            var settings = $.extend({
                totalrecords: 0,
                recordsperpage: 0,
                length: 10,
                next: 'next',
                prev: 'prev',
                first: 'first',
                last: 'last',
                go: 'go',
                theme: 'green',
                display: 'double',
                initval: 1,
                datacontainer: '', //data container id
                dataelement: '', //children elements to be filtered e.g. tr or div
                onchange: null,
                controlsalways: false
            }, options);
            return this.each(function () {
                var currentpage = 0;
                var startpage = 0;
                var totalpages = parseint(settings.totalrecords / settings.recordsperpage);
                if (settings.totalrecords % settings.recordsperpage > 0) totalpages++;
                var initialized = false;
                var container = $(this).addclass('smartpager').addclass(settings.theme);
                container.find('ul').remove();
                container.find('div').remove();
                container.find('span').remove();
                var datacontainer;
                var dataelements;
                if (settings.datacontainer != '') {
                    datacontainer = $('#' + settings.datacontainer);
                    dataelements = $('' + settings.dataelement + '', datacontainer);
                }
                var list = $('<ul/>');
                var btnprev = $('<div/>').text(settings.prev).click(function () { if ($(this).hasclass('disabled')) return false; currentpage = parseint(list.find('li a.active').text()) - 1; navigate(--currentpage); }).addclass('btn');
                var btnnext = $('<div/>').text(settings.next).click(function () { if ($(this).hasclass('disabled')) return false; currentpage = parseint(list.find('li a.active').text()); navigate(currentpage); }).addclass('btn');
                var btnfirst = $('<div/>').text(settings.first).click(function () { if ($(this).hasclass('disabled')) return false; currentpage = 0; navigate(0); }).addclass('btn');
                var btnlast = $('<div/>').text(settings.last).click(function () { if ($(this).hasclass('disabled')) return false; currentpage = totalpages - 1; navigate(currentpage); }).addclass('btn');
                var inputpage = $('<input/>').attr('type', 'text').keydown(function (e) {
                    if (istextselected(inputpage)) inputpage.val('');
                    if (e.which >= 48 && e.which < 58) {
                        var value = parseint(inputpage.val() + (e.which - 48));
                        if (!(value > 0 && value <= totalpages)) e.preventdefault();
                    } else if (!(e.which == 8 || e.which == 46)) e.preventdefault();
                });
                var btngo = $('<input/>').attr('type', 'button').attr('value', settings.go).addclass('btn').click(function () { if (inputpage.val() == '') return false; else { currentpage = parseint(inputpage.val()) - 1; navigate(currentpage); } });
                container.append(btnfirst).append(btnprev).append(list).append(btnnext).append(btnlast).append($('<div/>').addclass('short').append(inputpage).append(btngo));
                if (settings.display == 'single') {
                    btngo.css('display', 'none');
                    inputpage.css('display', 'none');
                }
                buildnavigation(startpage);
                if (settings.initval == 0) settings.initval = 1;
                currentpage = settings.initval - 1;
                navigate(currentpage);
                initialized = true;
                function showlabels(pageindex) {
                    container.find('span').remove();
                    var upper = (pageindex + 1) * settings.recordsperpage;
                    if (upper > settings.totalrecords) upper = settings.totalrecords;
                    container.append($('<span/>').append($('<b/>').text(pageindex * settings.recordsperpage + 1)))
                                             .append($('<span/>').text('-'))
                                             .append($('<span/>').append($('<b/>').text(upper)))
                                             .append($('<span/>').text('of'))
                                             .append($('<span/>').append($('<b/>').text(settings.totalrecords)));
                }
                function buildnavigation(startpage) {
                    list.find('li').remove();
                    // zb 2013-11-18 修改 加入类型转换parseint，如果1页显示1
                    if (settings.totalrecords <= settings.recordsperpage) {
                    	 list.append($('<li/>')
                                 .append($('<a>').attr('id', 1).addclass(settings.theme).addclass('normal')
                                 .attr('href', 'javascript:void(0)')
                                 .text(1))
                                 .click(function () {
                                     currentpage = startpage + $(this).closest('li').prevall().length;
                                     navigate(currentpage);
                                 }));
                    	return;
                    }
                    if (settings.totalrecords <= settings.recordsperpage) return;
                    for (var i = startpage; i < startpage + settings.length; i++) {
                        if (i == totalpages) break;
                        list.append($('<li/>')
                                    .append($('<a>').attr('id', (i + 1)).addclass(settings.theme).addclass('normal')
                                    .attr('href', 'javascript:void(0)')
                                    .text(i + 1))
                                    .click(function () {
                                        currentpage = startpage + $(this).closest('li').prevall().length;
                                        navigate(currentpage);
                                    }));
                    }
                    showlabels(startpage);
                    inputpage.val((startpage + 1));
                    list.find('li a').addclass(settings.theme).removeclass('active');
                    list.find('li:eq(0) a').addclass(settings.theme).addclass('active');
                    //set width of paginator
                    var lisize = list.find('li').length;
                    // zb 2014-12-19 修改列表宽度:bug 可能第一个窄最后一个宽 
                    /**
                    var sw = list.find('li:eq(0) a').outerwidth() + (parseint(list.find('li:eq(0)').css('margin-left')) * 2);
                    var width = sw * list.find('li').length;
                    **/
                    var width = 0 ;
                    var lisize = list.find('li').length;
                    for(i=0 ; i<lisize ; i++){
                    	var sw = list.find('li:eq('+i+') a').outerwidth() + (parseint(list.find('li:eq('+i+')').css('margin-left')) * 2);
                    	width += sw;
                    }
                    list.css({ width: width });
                    showrequiredbuttons(startpage);
                }
                function navigate(topage) {
                    //make sure the page in between min and max page count
                    var index = topage;
                    var mid = settings.length / 2;
                    if (settings.length % 2 > 0) mid = (settings.length + 1) / 2;
                    var startindex = 0;
                    if (topage >= 0 && topage < totalpages) {
                        if (topage >= mid) {
                            if (totalpages - topage > mid)
                                startindex = topage - (mid - 1);
                            else if (totalpages > settings.length)
                                startindex = totalpages - settings.length;
                        }
                        buildnavigation(startindex); showlabels(currentpage);
                        list.find('li a').removeclass('active');
                        inputpage.val(currentpage + 1);
                        list.find('li a[id="' + (index + 1) + '"]').addclass('active');
                        var recordstartindex = currentpage * settings.recordsperpage;
                        var recordsendindex = recordstartindex + settings.recordsperpage;
                        if (recordsendindex > settings.totalrecords)
                            recordsendindex = settings.totalrecords % recordsendindex;
                        if (initialized) {
                            if (settings.onchange != null) {
                                settings.onchange((currentpage + 1), recordstartindex, recordsendindex);
                            }
                        }
                        if (datacontainer != null) {
                            if (datacontainer.length > 0) {
                                //hide all elements first
                                dataelements.css('display', 'none');
                                //display elements that need to be displayed
                                if ($(dataelements[0]).find('th').length > 0) { //if there is a header, keep it visible always
                                    $(dataelements[0]).css('display', '');
                                    recordstartindex++;
                                    recordsendindex++;
                                }
                                for (var i = recordstartindex; i < recordsendindex; i++)
                                    $(dataelements[i]).css('display', '');
                            }
                        }

                        showrequiredbuttons();
                    }
                }
                function showrequiredbuttons() {
                    if (totalpages > settings.length) {
                        if (currentpage > 0) {
                            if (!settings.controlsalways) {
                                btnprev.css('display', '');
                            }
                            else {
                                btnprev.css('display', '').removeclass('disabled');
                            }
                        }
                        else {
                            if (!settings.controlsalways) {
                                btnprev.css('display', 'none');
                            }
                            else {
                                btnprev.css('display', '').addclass('disabled');
                            }
                        }
                        if (currentpage > settings.length / 2 - 1) {
                            if (!settings.controlsalways) {
                                btnfirst.css('display', '');
                            }
                            else {
                                btnfirst.css('display', '').removeclass('disabled');
                            }
                        }
                        else {
                            if (!settings.controlsalways) {
                                btnfirst.css('display', 'none');
                            }
                            else {
                                btnfirst.css('display', '').addclass('disabled');
                            }
                        }
                        if (currentpage == totalpages - 1) {
                            if (!settings.controlsalways) {
                                btnnext.css('display', 'none');
                            }
                            else {
                                btnnext.css('display', '').addclass('disabled');
                            }
                        }
                        else {
                            if (!settings.controlsalways) {
                                btnnext.css('display', '');
                            }
                            else {
                                btnnext.css('display', '').removeclass('disabled');
                            }
                        }
                        if (totalpages > settings.length && currentpage < (totalpages - (settings.length / 2)) - 1) {
                            if (!settings.controlsalways) {
                                btnlast.css('display', '');
                            }
                            else {
                                btnlast.css('display', '').removeclass('disabled');
                            }
                        }
                        else {
                            if (!settings.controlsalways) {
                                btnlast.css('display', 'none');
                            }
                            else {
                                btnlast.css('display', '').addclass('disabled');
                            }
                        };
                    }
                    else {
                        if (!settings.controlsalways) {
                            btnfirst.css('display', 'none');
                            btnprev.css('display', 'none');
                            btnnext.css('display', 'none');
                            btnlast.css('display', 'none');
                        }
                        else {
                            btnfirst.css('display', '').addclass('disabled');
                            btnprev.css('display', '').addclass('disabled');
                            btnnext.css('display', '').addclass('disabled');
                            btnlast.css('display', '').addclass('disabled');
                        }
                    }
                }
                function istextselected(el) {
                    var startpos = el.get(0).selectionstart;
                    var endpos = el.get(0).selectionend;
                    var doc = document.selection;
                    if (doc && doc.createrange().text.length != 0) {
                        return true;
                    } else if (!doc && el.val().substring(startpos, endpos).length != 0) {
                        return true;
                    }
                    return false;
                }
            });
        }
    });
})(jquery);