客户要求实现对表格数据的头几行或者头几列进行冻结,即滚动时保持这几行/列不动,通过网上查找代码,参考已有的代码的思路,实现了可以任意对行、列进行冻结。
实现原理:
创建多个div,div之间通过css实现层叠,每个div放置当前表格的克隆。例如:需要行冻结时,创建存放冻结行表格的div,通过设置z-index属性和position属性,让冻结行表格在数据表格的上层。同理,需要列冻结时,创建存放冻结列表格的div,并放置在数据表格的上层。如果需要行列都冻结时,则除了创建冻结行、冻结列表格的div,还需要创建左上角的固定行列表格的div,并放置在所有div的最上层。
处理表格的滚动事件,在表格横向或者纵向滚动时,同时让相应的冻结行和冻结列也同步滚动。
处理html的resize事件,同步修改表格的滚动区域宽度和高度
代码如下:
- /*
- * 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;
- });
- }
- });
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