jQuery实现冻结表格行和列

/*
 * 锁定表头和列
 * 
 * 参数定义
 *   table - 要锁定的表格元素或者表格ID
 *   freezeRowNum - 要锁定的前几行行数，如果行不锁定，则设置为0
 *   freezeColumnNum - 要锁定的前几列列数，如果列不锁定，则设置为0
 *   width - 表格的滚动区域宽度
 *   height - 表格的滚动区域高度
 */
function freezeTable(table, freezeRowNum, freezeColumnNum, width, height) {
  if (typeof(freezeRowNum) == 'string')
    freezeRowNum = parseInt(freezeRowNum)
    
  if (typeof(freezeColumnNum) == 'string')
    freezeColumnNum = parseInt(freezeColumnNum)

  var tableId;
  if (typeof(table) == 'string') {
    tableId = table;
    table = $('#' + tableId);
  } else
    tableId = table.attr('id');
    
  var divTableLayout = $("#" + tableId + "_tableLayout");
  
  if (divTableLayout.length != 0) {
    divTableLayout.before(table);
    divTableLayout.empty();
  } else {
    table.after("<div id='" + tableId + "_tableLayout' style='overflow:hidden;height:" + height + "px; width:" + width + "px;'></div>");
    
    divTableLayout = $("#" + tableId + "_tableLayout");
  }
  
  var html = '';
  if (freezeRowNum > 0 && freezeColumnNum > 0)
    html += '<div id="' + tableId + '_tableFix" style="padding: 0px;"></div>';
    
  if (freezeRowNum > 0)
    html += '<div id="' + tableId + '_tableHead" style="padding: 0px;"></div>';
    
  if (freezeColumnNum > 0)
    html += '<div id="' + tableId + '_tableColumn" style="padding: 0px;"></div>';
    
  html += '<div id="' + tableId + '_tableData" style="padding: 0px;"></div>';
  
  
  $(html).appendTo("#" + tableId + "_tableLayout");
  
  var divTableFix = freezeRowNum > 0 && freezeColumnNum > 0 ? $("#" + tableId + "_tableFix") : null;
  var divTableHead = freezeRowNum > 0 ? $("#" + tableId + "_tableHead") : null;
  var divTableColumn = freezeColumnNum > 0 ? $("#" + tableId + "_tableColumn") : null;
  var divTableData = $("#" + tableId + "_tableData");
  
  divTableData.append(table);
  
  if (divTableFix != null) {
    var tableFixClone = table.clone(true);
    tableFixClone.attr("id", tableId + "_tableFixClone");
    divTableFix.append(tableFixClone);
  }
  
  if (divTableHead != null) {
    var tableHeadClone = table.clone(true);
    tableHeadClone.attr("id", tableId + "_tableHeadClone");
    divTableHead.append(tableHeadClone);
  }
  
  if (divTableColumn != null) {
    var tableColumnClone = table.clone(true);
    tableColumnClone.attr("id", tableId + "_tableColumnClone");
    divTableColumn.append(tableColumnClone);
  }
  
  $("#" + tableId + "_tableLayout table").css("margin", "0");
  
  if (freezeRowNum > 0) {
    var HeadHeight = 0;
    var ignoreRowNum = 0;
    $("#" + tableId + "_tableHead tr:lt(" + freezeRowNum + ")").each(function () {
      if (ignoreRowNum > 0)
        ignoreRowNum--;
      else {
        var td = $(this).find('td:first, th:first');
        HeadHeight += td.outerHeight(true);
        
        ignoreRowNum = td.attr('rowSpan');
        if (typeof(ignoreRowNum) == 'undefined')
          ignoreRowNum = 0;
        else
          ignoreRowNum = parseInt(ignoreRowNum) - 1;
      }
    });
    HeadHeight += 2;
    
    divTableHead.css("height", HeadHeight);
    divTableFix != null && divTableFix.css("height", HeadHeight);
  }
  
  if (freezeColumnNum > 0) {
    var ColumnsWidth = 0;
    var ColumnsNumber = 0;
    $("#" + tableId + "_tableColumn tr:eq(" + freezeRowNum + ")").find("td:lt(" + freezeColumnNum + "), th:lt(" + freezeColumnNum + ")").each(function () {
      if (ColumnsNumber >= freezeColumnNum)
        return;
        
      ColumnsWidth += $(this).outerWidth(true);
      
      ColumnsNumber += $(this).attr('colSpan') ? parseInt($(this).attr('colSpan')) : 1;
    });
    ColumnsWidth += 2;

    divTableColumn.css("width", ColumnsWidth);
    divTableFix != null && divTableFix.css("width", ColumnsWidth);
  }
  
  divTableData.scroll(function () {
    divTableHead != null && divTableHead.scrollLeft(divTableData.scrollLeft());
    
    divTableColumn != null && divTableColumn.scrollTop(divTableData.scrollTop());
  });
  
  divTableFix != null && divTableFix.css({ "overflow": "hidden", "position": "absolute", "z-index": "50" });
  divTableHead != null && divTableHead.css({ "overflow": "hidden", "width": width - 17, "position": "absolute", "z-index": "45" });
  divTableColumn != null && divTableColumn.css({ "overflow": "hidden", "height": height - 17, "position": "absolute", "z-index": "40" });
  divTableData.css({ "overflow": "scroll", "width": width, "height": height, "position": "absolute" });
  
  divTableFix != null && divTableFix.offset(divTableLayout.offset());
  divTableHead != null && divTableHead.offset(divTableLayout.offset());
  divTableColumn != null && divTableColumn.offset(divTableLayout.offset());
  divTableData.offset(divTableLayout.offset());
}

/*
 * 调整锁定表的宽度和高度，这个函数在resize事件中调用
 * 
 * 参数定义
 *   table - 要锁定的表格元素或者表格ID
 *   width - 表格的滚动区域宽度
 *   height - 表格的滚动区域高度
 */
function adjustTableSize(table, width, height) {
  var tableId;
  if (typeof(table) == 'string')
    tableId = table;
  else
    tableId = table.attr('id');
  
  $("#" + tableId + "_tableLayout").width(width).height(height);
  $("#" + tableId + "_tableHead").width(width - 17);
  $("#" + tableId + "_tableColumn").height(height - 17);
  $("#" + tableId + "_tableData").width(width).height(height);
}

function pageHeight() {
  if ($.browser.msie) {
    return document.compatMode == "CSS1Compat" ? document.documentElement.clientHeight : document.body.clientHeight;
  } else {
    return self.innerHeight;
  }
};

//返回当前页面宽度
function pageWidth() {
  if ($.browser.msie) {
    return document.compatMode == "CSS1Compat" ? document.documentElement.clientWidth : document.body.clientWidth;
  } else {
    return self.innerWidth;
  }
};

$(document).ready(function() {
  var table = $("table");
  var tableId = table.attr('id');
  var freezeRowNum = table.attr('freezeRowNum');
  var freezeColumnNum = table.attr('freezeColumnNum');
  
  if (typeof(freezeRowNum) != 'undefined' || typeof(freezeColumnNum) != 'undefined') {
    freezeTable(table, freezeRowNum || 0, freezeColumnNum || 0, pageWidth(), pageHeight());
    
    var flag = false;
    $(window).resize(function() {
      if (flag) 
        return ;
      
      setTimeout(function() { 
        adjustTableSize(tableId, pageWidth(), pageHeight()); 
        flag = false; 
      }, 100);
      
      flag = true;
    });
  }
});