本文实例讲述了JavaScript对表格或元素按文本，数字或日期排序的方法。分享给大家供大家参考。具体实现方法如下：

// Sorting table columns correctly by text, number or date. There are other // versions, plugins, etc., for this but they either are restricted to specific // date formats, or require EVERY row-element to be given a sort attribute; mine // can handle many different date and number formats, and even allows for specific // cells that may not conform to the overall date/number format for that column. // My version also enables sorting of element hierarchies: such as a DIV containing // P-paragraphs and SPANs - this could even be an image-gallery containing prices // or dates within spans. Very efficient as well!! // Example: andrew.dx.am/sortgallerydel.html // AddSortToTables(); will make the table headers clickable, to sort columns in // ascending or descending order, for any tables with. // SortTable(tbl, col); will sort the table (tbl is an id or table object) by // the supplied column index (indexed from 0) in ascending or descending order. // AddSortByDate(tbl, col, dateMask); enables sorting of a column by date, // specified by a date-mask such as 'dd-mmm-yy'. // AddSortByNumber(tbl, col); enables sorting of a column by number. This assumes a // period . as the decimal separator (if present); it ignores any other non-numeric // characters. // SortElements(parentEl, childTag, colTag, colIndex); will sort (non-table) // elements in ascending or descending order. For example, an UL containing LIs // and SPANs. colIndex specifies which span to sort; there may be more than one in // the LI (0 indexed). // Example: SortElements('divid', 'p', 'span', 2); // 3rd span within each paragraph. // // AddSortByDate2(parentEl, childTag, colTag, colIndex, dateMask); and // AddSortByNumber2(parentEl, childTag, colTag, colIndex) // provide the same feature-set as AddSortByDate and AddSortByNumber does // for tables, but for element hierarchies. // If there are dates or numbers in a column (or element) which don't meet the // date-mask or number formatting necessary to sort correctly, then these individual // elements can be given the attribute "sort" and they will still sort correctly! // For example, with a date column <td sort="2012/12/20"> will still sort a // cell correctly. (This format 'YYYY/MM/DD' will be converted into a Date() object.) var MonthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]; var DayNames = [ "Sunday", "Monday", "Tueday", "Wednesday", "Thursday", "Friday", "Saturday" ]; var ShortMths = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; var ShortDays = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]; var AddEvent = function (elem, eventType, func) { // Helper function. if ( elem.addEventListener ) AddEvent = function (elem, eventType, func) { elem.addEventListener(eventType, func, false); }; else if ( elem.attachEvent ) AddEvent = function (elem, eventType, func) { elem.attachEvent('on' + eventType, func); }; else AddEvent = function (elem, eventType, func) { elem['on' + eventType] = func; }; AddEvent(elem, eventType, func); }; // Sort methods/algorithms attributed: var SortTable = function (tbl, col) { // could be called directly SortElements(tbl, 'tr', 'td', col); }; var SortElements = function (parentEl, childTag, colTag, colIndex) { // example use: SortElements('table1','tr','td',2) // or SortElements('list1','li') // or SortElements('divName','p','span',3) var i, j, cTags = {}, startAt = 0, childLen, aChild, elem, sortBy, content, elems = [], sortedLen, frag, hdrsLen, hdr; var parent = (typeof parentEl === 'string') ? document.getElementById(parentEl) : parentEl; var AscText = function (a, b) { // sort() by .data as text var x = a.data, y = b.data, xNum = parseFloat(x), yNum = parseFloat(y); // check if each begin with a number.. if ( !isNaN(xNum) && !isNaN(yNum) && (xNum - yNum) ) return xNum - yNum; return ((x < y) ? -1 : ((x > y) ? 1 : 0)); }; var DescText = function (a, b) { // sort() by .data var x = a.data, y = b.data, xNum = parseFloat(x), yNum = parseFloat(y); // check if each begin with a number.. if ( !isNaN(xNum) && !isNaN(yNum) && (yNum - xNum) ) return yNum - xNum; return ((x > y) ? -1 : ((x < y) ? 1 : 0)); }; var AscNum = function (a, b) { // used with dates as well return a.data - b.data; }; var DescNum = function (a, b) { return b.data - a.data; }; if (parent.nodeName.toLowerCase() == 'table') { if ( childTag == 'tr' ) { sortBy = parent.rows[0].cells[colIndex].sortBy || 'text'; } parent = parent.tBodies[0] || parent; if ( parent.rows[0].cells[0].nodeName.toLowerCase() == 'th' ) { startAt = 1; } } cTags = parent.getElementsByTagName(childTag); if ( typeof colIndex == 'undefined' ) { sortBy = 'text'; // sort simple lists or paragraphs as text } for (i = startAt, childLen = cTags.length; i < childLen; i++) { // ..go forward examining each child aChild = cTags[i]; elem = (colTag) ? aChild.getElementsByTagName(colTag)[colIndex] : aChild; if (elem) { if ( !sortBy ) { // sorting non-table columns.. sortBy = (typeof elem.numberValue != 'undefined') ? 'number' : ((typeof elem.dateValue != 'undefined') ? 'date' : 'text'); } switch (sortBy) { // You can supply 'sort' attributes to enable sorting of numbers, etc. // For example, <td sort='2011/02/12'> for a date. case 'text': content = (elem.getAttribute('sort') || elem.firstChild.nodeValue).toLowerCase(); break; case 'number': content = elem.numberValue; break; case 'date': content = elem.dateValue; break; default: content = (elem.getAttribute('sort') || elem.firstChild.nodeValue).toLowerCase(); break; } j = elems.length; if ( !aChild.id ) aChild.id = 'tempSortID' + j; elems[j] = { data: content, tempID: aChild.id }; } } // The following will determine if the table/etc has already been sorted // by the same column or tag. If so, it will sort in ascending or descending // order. It creates custom element properties to the parent element to // remember the previous sort details. if ( typeof colIndex == 'undefined' ) colIndex = 0; if ( parent.prevTag && parent.prevTag == ((typeof colTag == 'undefined') ? childTag : colTag) ) { if (parent.prevCol == colIndex) { // sorting by the same column as previously parent.prevSort = (parent.prevSort == 'asc') ? 'desc' : 'asc'; } else { // sorting by any other column parent.prevCol = colIndex; parent.prevSort = 'asc'; } } else { // sorting for the 1st time or by a different tag parent.prevTag = ((typeof colTag == 'undefined') ? childTag : colTag); parent.prevCol = colIndex; parent.prevSort = 'asc'; } if ( parent.prevSort === 'desc' ) { // 'desc' WILL BE the previous sort order.. switch (sortBy) { case 'text': elems.sort(DescText); break; case 'number': elems.sort(DescNum); break; case 'date': elems.sort(DescNum); break; default: elems.sort(DescText); break; } } else { switch (sortBy) { case 'text': elems.sort(AscText); break; case 'number': elems.sort(AscNum); break; case 'date': elems.sort(AscNum); break; default: elems.sort(AscText); break; } } frag = document.createDocumentFragment(); for (i = 0, sortedLen = elems.length; i < sortedLen; i++) { elem = document.getElementById(elems[i].tempID); frag.appendChild(elem); if ( (elem.id).substr(0,10) == 'tempSortID' ) elem.removeAttribute('id'); } parent.appendChild(frag); elems = null; return parent.prevSort; // not currently used }; var AddSortToTables = function () { // ..if table has class-name 'sortIt' var tables = document.getElementsByTagName('table'), i, j, tblLen, tbl, hdrs, hdrsLen; function PreserveSortScope(a,b,c,d) { return function () { // assign the SortElements fn. to a table header SortElements(a, b, c, d); } } // add sorting to table headers for ( i = 0, tblLen = tables.length; i < tblLen; i++ ) { tbl = tables[i]; if ( tbl.className.indexOf('sortIt') + 1) { hdrs = tbl.getElementsByTagName('th'); if ( hdrs ) { for ( j = 0, hdrsLen = hdrs.length; j < hdrsLen; j++ ) { AddEvent(hdrs[j],'click',PreserveSortScope(tbl,'tr','td',j)); // if there's no title already, add "Click to sort" if ( !hdrs[j].title ) hdrs[j].setAttribute('title', 'Click to sort'); } } } } }; var AddSortByDate = function (tbl, col, dateMask) { // Input: the table name (or object), a column index (or array) // and a date mask ('dd-mmm-yy') // Adds a sortBy = 'date' property to the first row // will ignore the first row, assuming it is a header row var i, rLen, cell; while ( col.length ) AddSortByDate(tbl,col.pop(),dateMask); if ((col instanceof Array) || isNaN(col)) return; var tbl = (typeof tbl === 'string') ? document.getElementById(tbl) : tbl; tbl.rows[0].cells[col].sortBy = 'date'; AddSortByDate2(tbl, 'tr', 'td', col, dateMask); }; var AddSortByDate2 = function (parentEl, childTag, colTag, colIndex, dateMask) { var kids, startAt = 0, i, rLen, cell; var parent = (typeof parentEl === 'string') ? document.getElementById(parentEl) : parentEl; if ( parent.nodeName.toLowerCase() == 'table' ) { parent = parent.tBodies[0] || parent; startAt = ( parent.rows[0].cells[0].nodeName.toLowerCase() == 'th' ) * 1; } kids = parent.getElementsByTagName(childTag); for ( i = startAt, rLen = kids.length; i < rLen; i++) { cell = kids[i].getElementsByTagName(colTag)[colIndex]; if (cell) { if ( typeof cell.numberValue != 'undefined' ) delete cell.numberValue; // the above enables switching from a number to a date sort // (although v. unlikely) if (cell.getAttribute('sort')) { // use sort attribute if present cell.dateValue = new Date(cell.getAttribute('sort')); } else { cell.dateValue = new Date(StringToDate(cell.firstChild.nodeValue, dateMask)); } if (cell.dateValue.toString() == "NaN" || cell.dateValue.toString() == "Invalid Date") { cell.dateValue = 0; } } } }; var AddSortByNumber = function (tbl, col) { // col is a column index or array of indices // will ignore the first row, assuming it is a header row var i, rLen, cell, tempNum; while ( col.length ) AddSortByNumber(tbl,col.pop()); if ((col instanceof Array) || isNaN(col)) return; tbl = (typeof tbl === 'string') ? document.getElementById(tbl) : tbl; tbl.rows[0].cells[col].sortBy = 'number'; AddSortByNumber2(tbl,'tr','td',col); }; var AddSortByNumber2 = function (parentEl, childTag, colTag, colIndex) { var kids, startAt = 0, i, rLen, cell, tempNum; var parent = (typeof parentEl === 'string') ? document.getElementById(parentEl) : parentEl; if ( parent.nodeName.toLowerCase() == 'table' ) { parent = parent.tBodies[0] || parent; startAt = (parent.rows[0].cells[0].nodeName.toLowerCase() == 'th') * 1; } kids = parent.getElementsByTagName(childTag); for (i = startAt, rLen = kids.length; i < rLen; i++) { cell = kids[i].getElementsByTagName(colTag)[colIndex]; if (cell) { if ( typeof cell.dateValue != 'undefined' ) delete cell.dateValue; // the above enables switching from a date to a number sort // (although v. unlikely) tempNum = cell.getAttribute('sort') || cell.firstChild.nodeValue; tempNum = tempNum.replace(/[^0-9.-]/g, ''); cell.numberValue = parseFloat(tempNum); if (isNaN(cell.numberValue)) cell.numberValue = 0.0; } } }; var StringToDate = function (sDate, sFormat, cutOff) { // Input: a date value as a string, it's format as a string e.g. 'dd-mmm-yy' // Optional: a cutoff (integer) for 2 digit years. // If no 'd' appears in the format string then the 1st of the month is assumed. // If the year is 20 and the cut-off is 30 then the value will be converted // to 2020; if the year is 40 then this will be converted to 1940. // If no cut-off is supplied then '20' will be pre-pended to the year (YY). // Output: a string in the format 'YYYY/MM/DD' or '' // Will not attempt to convert certain combinations e.g. DMM, MDD, DDM, YYYYD. var sParsed, fndSingle; // sParsed will be constructed in the format 'YYYY/MM/DD' sDate = sDate.toString().toUpperCase(); sFormat = sFormat.toUpperCase(); if (sFormat.search(/MMMM|MMM/) + 1) { // replace Mar/March with 03, etc. sDate = sDate.replace(new RegExp('(' + ShortMths.join('|') + ')[A-Z]*', 'gi'), function (m) { var i = ShortMths.indexOf(m.charAt(0).toUpperCase() + m.substr(1, 2).toLowerCase()) + 1; return ((i < 10) " + i).toString(); }); sFormat = sFormat.replace(/MMMM|MMM/g, 'MM'); } if (sFormat.search(/DDDD|DDD/) + 1) { // replace Tue/Tuesday, etc. with '' sDate = sDate.replace(new RegExp('(' + ShortDays.join('|') + ')[A-Z]*', 'gi'),''); sFormat = sFormat.replace(/DDDD|DDD/g, ''); } sDate = sDate.replace(/(^|D)(d)(?=D|$)/g, function($0, $1, $2) { // single digits 2 with 02 return $1 + '0' + $2; }); sFormat = sFormat.replace(/(^|[^DMY])(D|M)(?=[^DMY]|$)/g, function($0, $1, $2){ return $1 + $2 + $2; // replace D or M with DD and MM }); // are there still single Ds or Ms? fndSingle = sFormat.search(/(^|[^D])D([^D]|$)|(^|[^M])M([^M]|$)/)+1; if ( fndSingle ) return ''; // do not attempt to parse, for example, 'DMM' sFormat = sFormat.replace(/(^|[^Y])(YY)(?=[^Y]|$)/g, function($0, $1, $2, index) { var tempDate = sDate.substr(0, index + 1); tempDate += (cutOff) ? ((parseInt(sDate.substr(index + 1, 2),10) > cutOff) ? '19' : '20') : '20'; tempDate += sDate.substr(index + 1); sDate = tempDate; return $1 + $2 + $2; }); sParsed = ('YYYY/MM/DD').replace(/YYYY|MM|DD/g, function(m){ return (sFormat.indexOf(m) + 1) ? sDate.substr(sFormat.indexOf(m), m.length) : ''; }); if (sParsed.charAt(0) == '/') { // if no year specified, assume the current year sParsed = (new Date().getFullYear()) + sParsed; } if (sParsed.charAt(sParsed.length - 1) == '/') { // if no date, assume the 1st of the month sParsed += '01'; } // should end up with 10 characters.. return ( sParsed.length == 10 ) ? sParsed : ''; };

希望本文所述对大家的javascript程序设计有所帮助。