[英]Sort Array Object with Multiple Keys: Javascript
好吧,我有一個帶隨機值的數組對象,Ex。
var arr = [
{ id:1001, date:"20-02-2014", Name: 'demo1' },
{ id:1004, date:"13-02-2014", Name: 'demo0' },
{ id:1000, date:"10-02-2014", Name: 'demo14' },
{ id:1004, date:"16-02-2014", Name: 'demo10' },
{ id:1006, date:"22-02-2014", Name: 'demo111' },
{ id:1003, date:"28-02-2014", Name: 'demo16' },
{ id:1000, date:"28-01-2014", Name: 'demo12' },
{ id:1004, date:"28-01-2014", Name: 'demo01' },
{ id:1000, date:"08-01-2014", Name: 'demo41' },
{ id:1006, date:"08-01-2014", Name: 'demo91' }
]
我想先按鍵id
然后按關鍵date
排序這個數組,
輸出:
sorted_arr = [
{"id":1000,"date":"08-01-2014","Name":"demo41"}, //group1
{"id":1000,"date":"28-01-2014","Name":"demo12"}, //group1
{"id":1000,"date":"10-02-2014","Name":"demo14"}, //group1
{"id":1001,"date":"20-02-2014","Name":"demo1"}, //group2
{"id":1003,"date":"28-02-2014","Name":"demo16"}, //group3
{"id":1004,"date":"28-01-2014","Name":"demo01"}, //group4
{"id":1004,"date":"13-02-2014","Name":"demo0"}, //group4
{"id":1004,"date":"16-02-2014","Name":"demo10"}, //group4
{"id":1006,"date":"08-01-2014","Name":"demo91"} //group5
{"id":1006,"date":"22-02-2014","Name":"demo111"} //group5
]
我嘗試了幾個通用代碼來排序,
// generic comparison function
cmp = function(x, y){
return x > y ? 1 : x < y ? -1 : 0;
};
arr.sort(function(a, b){
return cmp(
[cmp(a.id, b.id), cmp(a.date, b.date)],
[cmp(b.id, a.id), cmp(b.date, a.date)]
);
});
我提到了幾個例子SO示例,但沒有得到預期的輸出。 請建議我最好的方法來獲得這個。
無需創建Date
對象,只需將日期字符串重新排序為可排序字符串,例如
此示例假定您的日期格式與DD-MM-YYYY
並為日期排序創建YYYYMMDD
。
使用Javascript
var arr = [
{ id:1001, date:"20-02-2014", Name: 'demo1' },
{ id:1004, date:"13-02-2014", Name: 'demo0' },
{ id:1000, date:"10-02-2014", Name: 'demo14' },
{ id:1004, date:"16-02-2014", Name: 'demo10' },
{ id:1006, date:"22-02-2014", Name: 'demo111' },
{ id:1003, date:"28-02-2014", Name: 'demo16' },
{ id:1000, date:"28-01-2014", Name: 'demo12' },
{ id:1004, date:"28-01-2014", Name: 'demo01' },
{ id:1000, date:"08-01-2014", Name: 'demo41' },
{ id:1006, date:"08-01-2014", Name: 'demo91' }
];
var sorted = arr.sort(function (a, b) {
return a.id - b.id || a.date.split('-').reverse().join('') - b.date.split('-').reverse().join('');
});
sorted.forEach(function (element) {
console.log(JSON.stringify(element));
});
產量
{"id":1000,"date":"08-01-2014","Name":"demo41"} {"id":1000,"date":"28-01-2014","Name":"demo12"} {"id":1000,"date":"10-02-2014","Name":"demo14"} {"id":1001,"date":"20-02-2014","Name":"demo1"} {"id":1003,"date":"28-02-2014","Name":"demo16"} {"id":1004,"date":"28-01-2014","Name":"demo01"} {"id":1004,"date":"13-02-2014","Name":"demo0"} {"id":1004,"date":"16-02-2014","Name":"demo10"} {"id":1006,"date":"08-01-2014","Name":"demo91"} {"id":1006,"date":"22-02-2014","Name":"demo111"}
如果對混合日期格式有任何疑慮,如@xdazz所討論的那樣,那么你可以通過自己檢查填充來改進。 按日期排序時,以下內容將創建格式“YYYYYYMMDD”。 在這個例子中沒有必要使用額外的年份填充,因為我正在取值的數值差異,但如果你選擇比較字符串那么它很重要。
function pad(s, n) {
var v = '',
i;
for(i = 0; i < n - s.length; i += 1) {
v += '0';
}
return v + s;
}
var sorted = arr.sort(function (a, b) {
var idDiff = a.id - b.id;
if (idDiff) {
return idDiff;
}
var ordA = a.date.split('-').reverse(),
ordB = b.date.split('-').reverse();
ordA[0] = pad(ordA[0], 6);
ordA[1] = pad(ordA[1], 2);
ordA[2] = pad(ordA[2], 2);
ordA = ordA.join('');
ordB[0] = pad(ordB[0], 6);
ordB[1] = pad(ordB[1], 2);
ordB[2] = pad(ordB[2], 2);
ordB = ordB.join('');
return ordA - ordB;
});
如果你真的想使用Date
對象,我建議如下。
var sorted = arr.sort(function (a, b) {
var idDiff = a.id - b.id;
if (idDiff) {
return idDiff;
}
var ordA = a.date.split('-').reverse(),
ordB = b.date.split('-').reverse();
ordA[1] -= 1;
ordB[1] -= 1;
return new Date(Date.UTC.apply(undefined, ordA)).valueOf() - new Date(Date.UTC.apply(undefined, ordB)).valueOf();
});
sorted.forEach(function (element) {
console.log(JSON.stringify(element));
});
注意:這些示例不處理負數年份的日期,您還需要進行進一步修改。
首先與id進行比較,然后如果id相等則與date進行比較。 但由於您的日期格式無效,因此必須進行額外的工作才能讓Date
識別。
sorted_arr = arr.sort(function(a, b) {
return a.id - b.id || new Date(a.date.split('-').reverse().join('-')) - new Date(b.date.split('-').reverse().join('-'));
});
編輯:如果您保證在1位數月份和日期前面有零,那么您甚至可以不解析到目前為止:
sorted_arr = arr.sort(function(a, b) {
return a.id - b.id || a.date.split('-').reverse().join('') - b.date.split('-').reverse().join('');
});
您可以使用Alasql庫按兩個屬性對數組進行排序:
var res = alasql('SELECT *, mid(date,7,4)+mid(date,4,2)+mid(date,1,2) AS ndate \
FROM ? ORDER BY id, ndate',[arr]);
在jsFiddle上試試這個例子。
這里“mid(date,7,4)+ mid(date,4,2)+ mid(date,1,2)”用於將日期從'28 -11-2014'轉換為排序鍵,如'20141128' 。
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