JavaScript对表格或元素按文本，数字或日期排序的方法_javascript技巧
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2022-05-18 23:41:17
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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 class="sortIt".
// 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 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 : 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 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 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。
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