JavaScript实现表格排序

<SCRIPT LANGUAGE="JavaScript">
    var dom = (document.getElementsByTagName) ? true : false;
    var ie5 = (document.getElementsByTagName && document.all) ? true : false;
    var arrowUp, arrowDown;
    if (ie5 || dom)
        initSortTable();
    function initSortTable() {
        arrowUp = document.createElement("SPAN");
        var tn = document.createTextNode("↑");
        arrowUp.appendChild(tn);
        arrowUp.className = "arrow";
        arrowDown = document.createElement("SPAN");
        var tn = document.createTextNode("↓");
        arrowDown.appendChild(tn);
        arrowDown.className = "arrow";
    }
    function sortTable(tableNode, nCol, bDesc, sType) {
        var tBody = tableNode.tBodies[0];
        var trs = tBody.rows;
        var trl= trs.length;
        var a = new Array();
        for (var i = 0; i < trl; i++) {
            a[i] = trs[i];
        }
        var start = new Date;
        window.status = "Sorting data...";
        a.sort(compareByColumn(nCol,bDesc,sType));
        window.status = "Sorting data done";
        for (var i = 0; i < trl; i++) {
            tBody.appendChild(a[i]);
            window.status = "Updating row " + (i + 1) + " of " + trl +
                " (Time spent: " + (new Date - start) + "ms)";
        }
        // check for onsort
        if (typeof tableNode.onsort == "string")
            tableNode.onsort = new Function("", tableNode.onsort);
        if (typeof tableNode.onsort == "function")
            tableNode.onsort();
    }
    function CaseInsensitiveString(s) {
        return String(s).toUpperCase();
    }
    function parseDate(s) {
        return Date.parse(s.replace(//-/g, '/'));
    }
    function toNumber(s) {
        return Number(s.replace(/[^0-9/.]/g, ""));
    }
    function Percent(s) {
        return Number(s.replace("%", ""));
    }
    function compareByColumn(nCol, bDescending, sType) {
        var c = nCol;
        var d = bDescending;
        var fTypeCast = String;
        if (sType == "Number")
            fTypeCast = Number;
        else if (sType == "Date")
            fTypeCast = parseDate;
        else if (sType == "CaseInsensitiveString")
            fTypeCast = CaseInsensitiveString;
        else if (sType == "Percent")
            fTypeCast = Percent;
        return function (n1, n2) {
            if (fTypeCast(getInnerText(n1.cells[c])) < fTypeCast(getInnerText(n2.cells[c])))
                return d ? -1 : +1;
            if (fTypeCast(getInnerText(n1.cells[c])) > fTypeCast(getInnerText(n2.cells[c])))
                return d ? +1 : -1;
            return 0;
        };
    }
    function sortColumnWithHold(e) {
        var el = ie5 ? e.srcElement : e.target;
        var table = getParent(el, "TABLE");
        var oldCursor = table.style.cursor;
        var oldClick = table.onclick;
        table.style.cursor = "wait";
        table.onclick = null;
        var fakeEvent = {srcElement : e.srcElement, target : e.target};
        window.setTimeout(function () {
            sortColumn(fakeEvent);
            table.style.cursor = oldCursor;
            table.onclick = oldClick;
        }, 100);
    }
    function sortColumn(e) {
        var tmp = e.target ? e.target : e.srcElement;
        var tHeadParent = getParent(tmp, "THEAD");
        var el = getParent(tmp, "TD");
        if (tHeadParent == null)
            return;
        if (el != null) {
            var p = el.parentNode;
            var i;
            el._descending = !Boolean(el._descending);
            if (tHeadParent.arrow != null) {
                if (tHeadParent.arrow.parentNode != el) {
                    tHeadParent.arrow.parentNode._descending = null;    
                }
                tHeadParent.arrow.parentNode.removeChild(tHeadParent.arrow);
            }
            if (el._descending)
                tHeadParent.arrow = arrowUp.cloneNode(true);
            else
                tHeadParent.arrow = arrowDown.cloneNode(true);
            el.appendChild(tHeadParent.arrow);
            var cells = p.cells;
            var l = cells.length;
            for (i = 0; i < l; i++) {
                if (cells[i] == el) break;
            }
            var table = getParent(el, "TABLE");
            sortTable(table,i,el._descending, el.getAttribute("type"));
        }
    }
    function getInnerText(el) {
        if (ie5) return el.innerText; 
        var str = "";
        var cs = el.childNodes;
        var l = cs.length;
        for (var i = 0; i < l; i++) {
            switch (cs[i].nodeType) {
                case 1: 
                    str += getInnerText(cs[i]);
                    break;
                case 3: 
                    str += cs[i].nodeValue;
                    break;
            }
        }
        return str;
    }
    function getParent(el, pTagName) {
        if (el == null) return null;
        else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())
            return el;
        else
            return getParent(el.parentNode, pTagName);
    }
</SCRIPT>

<table cellspacing="0" onclick="sortColumn(event)">
<thead>
    <tr>
        <td style="width: 60px;" type="String">String</td>
        <td style="width: 60px;" type="CaseInsensitiveString" title="CaseInsensitiveString">String</td>
        <td style="width: 60px;" type="Number">Number</td>
        <td style="width: 60px;" type="Date">Date</td>
    </tr>
</thead>
<tbody>
    <tr>
        <td>apple</td>
        <td>Strawberry</td>
        <td style="text-align: right;" mce_style="text-align: right;">45</td>
        <td>2001-03-13</td>
    </tr>
    <tr>
        <td>Banana</td>
        <td>orange</td>
        <td style="text-align: right;" mce_style="text-align: right;">7698</td>
        <td>1789-07-14</td>
    </tr>
    <tr>
        <td>orange</td>
        <td>Banana</td>
        <td style="text-align: right;" mce_style="text-align: right;">4546</td>
        <td>1949-07-04</td>
    </tr>
    <tr>
        <td>Strawberry</td>
        <td>apple</td>
        <td style="text-align: right;" mce_style="text-align: right;">987</td>
        <td>1975-08-19</td>
    </tr>
    <tr>
        <td>Pear</td>
        <td>blueberry</td>
        <td style="text-align: right;" mce_style="text-align: right;">98743</td>
        <td>2001-01-01</td>
    </tr>
    <tr>
        <td>blueberry</td>
        <td>Pear</td>
        <td style="text-align: right;" mce_style="text-align: right;">4</td>
        <td>2001-04-18</td>
    </tr>
</tbody>
</table>