jQuery实现固定表头

本文介绍如何使用jquery来固定表头的方法,看下代码:

jQuery.fn.CloneTableHeader = function(tableId, tableParentDivId) {
    //获取冻结表头所在的DIV,如果DIV已存在则移除
    var obj = document.getElementById("tableHeaderDiv"   tableId);
    if (obj) {
         jQuery(obj).remove();
    } 
    var browserName = navigator.appName;//获取浏览器信息,用于后面代码区分浏览器
    var ver = navigator.appVersion;
    var browserVersion = parseFloat(ver.substring(ver.indexOf("MSIE")   5, ver.lastIndexOf("Windows")));
    var content = document.getElementById(tableParentDivId);
    var scrollWidth = content.offsetWidth - content.clientWidth;
 
 var tableOrg = jQuery("#"   tableId);//获取表内容
    var table = tableOrg.clone();//克隆表内容
    table.attr("id", "cloneTable");
    //注意:需要将要冻结的表头放入thead中 
    var tableHeader = jQuery(tableOrg).find("thead");
    var tableHeaderHeight = tableHeader.height();
    tableHeader.hide();
    var colsWidths = jQuery(tableOrg).find("tbody tr:first td").map(function() {
        return jQuery(this).width();
    });//动态获取每一列的宽度
    var tableCloneCols = jQuery(table).find("thead tr:first td")
    if (colsWidths.size() > 0) {//根据浏览器为冻结的表头宽度赋值(主要是区分IE8)
        for (i = 0; i < tableCloneCols.size(); i  ) {
            if (i == tableCloneCols.size() - 1) {
                if (browserVersion == 8.0)
                    tableCloneCols.eq(i).width(colsWidths[i]   scrollWidth);
                else
                    tableCloneCols.eq(i).width(colsWidths[i]);
            } else {
                tableCloneCols.eq(i).width(colsWidths[i]);
            }
        }
    }
    //创建冻结表头的DIV容器,并设置属性
    var headerDiv = document.createElement("div");
    headerDiv.appendChild(table[0]);
    jQuery(headerDiv).css("height", tableHeaderHeight);
    jQuery(headerDiv).css("overflow", "hidden");
    jQuery(headerDiv).css("z-index", "20");
    jQuery(headerDiv).css("width", "100%");
    jQuery(headerDiv).attr("id", "tableHeaderDiv"   tableId);
    jQuery(headerDiv).insertBefore(tableOrg.parent());
}

以上就是完整代码，现在看下如何使用:
只需在页面中加入以下脚本:
<script type="text/javascript">
        jQuery(function() {
            jQuery.fn.CloneTableHeader("tab1", "div1");
        });
    </script>
<div style=" height: 100px; overflow:scroll;" id="div1">
        <table cellpadding="0" id="tab1" cellspacing="0" border="0" class="itemList">
            <thead>
                <tr style="background-color: #eeeeee; margin: 0px; line-height: 20px; font-weight: bold;
                    padding: 0px 0px 0px 0px;">
                    <td>
                        编号
                    </td>
                    <td>
                        姓名
                    </td>
                    <td>
                        年龄
                    </td>
                    <td>
                        城市
                    </td>
                </tr>
                <tr style="background-color: #eeeeee; margin: 0px; line-height: 20px; font-weight: bold;
                    padding: 0px 0px 0px 0px;">
                    <td colspan="2">身高</td>
                    <td colspan="2">体重</td>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
                <tr>
                    <td>
                        1
                    </td>
                    <td>
                        张三1
                    </td>
                    <td>
                        22
                    </td>
                    <td>
                        北京
                    </td>
                </tr>
                <tr>
                    <td colspan="2">170</td>
                    <td colspan="2">99</td>
                </tr>
            </tbody>
        </table>
    </div>