// JavaScript Document By lishewen
var theTable = document.getElementById("tablelsw");
var totalPage = document.getElementById("spanTotalPage");
var pageNum = document.getElementById("spanPageNum");

var spanPre = document.getElementById("spanPre");
var spanNext = document.getElementById("spanNext");
var spanFirst = document.getElementById("spanFirst");
var spanLast = document.getElementById("spanLast");

var totalPaget = document.getElementById("spanTotalPaget");
var pageNumt = document.getElementById("spanPageNumt");

var spanPret = document.getElementById("spanPret");
var spanNextt = document.getElementById("spanNextt");
var spanFirstt = document.getElementById("spanFirstt");
var spanLastt = document.getElementById("spanLastt");

var numberRowsInTable = theTable.rows.length;
var pageSize = 20;
var page = 1;

//下一页
function next() {

    hideTable();
    
    currentRow = pageSize * page;
    maxRow = currentRow + pageSize;
    if ( maxRow > numberRowsInTable ) maxRow = numberRowsInTable;
    for ( var i = currentRow; i< maxRow; i++ ) {
        theTable.rows[i].style.display = '';
    }
    page++;
    
    if ( maxRow == numberRowsInTable )  { nextText(); lastText(); }
    showPage();
    preLink();
    firstLink();
}

//上一页
function pre() {

    hideTable();
    
    page--;
    
    currentRow = pageSize * page;
    maxRow = currentRow - pageSize;
    if ( currentRow > numberRowsInTable ) currentRow = numberRowsInTable;
    for ( var i = maxRow; i< currentRow; i++ ) {
        theTable.rows[i].style.display = '';
    }
    
    
    if ( maxRow == 0 ) { preText(); firstText(); }
    showPage();
    nextLink();
    lastLink();
}

//第一页
function first() {
    hideTable();
    page = 1;
    for ( var i = 0; i<pageSize; i++ ) {
        theTable.rows[i].style.display = '';
    }
    showPage();
    
    preText();
    nextLink();
    lastLink();
}

//最后一页
function last() {
    hideTable();
    page = pageCount();
    currentRow = pageSize * (page - 1);
    for ( var i = currentRow; i<numberRowsInTable; i++ ) {
        theTable.rows[i].style.display = '';
    }
    showPage();
    
    preLink();
    nextText();
    firstLink();
}

function hideTable() {
    for ( var i = 0; i<numberRowsInTable; i++ ) {
        theTable.rows[i].style.display = 'none';
    }
}

function showPage() {
    pageNum.innerHTML = page;
    pageNumt.innerHTML = page;
}

//总共页数
function pageCount() {
    var count = 0;
    if ( numberRowsInTable%pageSize != 0 ) count = 1; 
    return parseInt(numberRowsInTable/pageSize) + count;
}

//显示链接
function preLink() { spanPre.innerHTML = "<a href='javascript:pre();'>上一页</a>"; spanPret.innerHTML = "<a href='javascript:pre();'>上一页</a>";}
function preText() { spanPre.innerHTML = "上一页"; spanPret.innerHTML = "上一页"; }

function nextLink() { spanNext.innerHTML = "<a href='javascript:next();'>下一页</a>"; spanNextt.innerHTML = "<a href='javascript:next();'>下一页</a>";}
function nextText() { spanNext.innerHTML = "下一页"; spanNextt.innerHTML = "下一页";}

function firstLink() { spanFirst.innerHTML = "<a href='javascript:first();'>第一页</a>"; spanFirstt.innerHTML = "<a href='javascript:first();'>第一页</a>";}
function firstText() { spanFirst.innerHTML = "第一页"; spanFirstt.innerHTML = "第一页";}

function lastLink() { spanLast.innerHTML = "<a href='javascript:last();'>最后一页</a>"; spanLastt.innerHTML = "<a href='javascript:last();'>最后一页</a>";}
function lastText() { spanLast.innerHTML = "最后一页"; spanLastt.innerHTML = "最后一页";}

//隐藏表格
function hide() {
    for ( var i = pageSize; i<numberRowsInTable; i++ ) {
        theTable.rows[i].style.display = 'none';
    }
    
    totalPage.innerHTML = pageCount();
    pageNum.innerHTML = '1';
    
    totalPaget.innerHTML = pageCount();
    pageNumt.innerHTML = '1';
    
    nextLink();
    lastLink();
}

hide();