[英]Sort all key elements by the same value in javascript
我有一個這樣的對象:
var objectName = { "290" : "Cat1", "293" : "Cat2", "295" : "Cat1" }
如何對具有相同值的元素的輸出進行排序?
我需要這樣的東西:
var sortByCat = 'Cat1: 290, 295; Cat2: 293';
Javascript或jQuery都可以正常工作。
這個問題有點不合常規,但是不確定為什么它被否決了。 無論如何,您可以執行以下操作:
https://jsfiddle.net/wfyndq7x/
var obj = { '290': 'Cat1', '293': 'Cat2', '295': 'Cat1' };
var sortByCat = {}
for (var num in obj) {
if (obj.hasOwnProperty(num)) {
if (sortByCat[obj[num]] == null)
sortByCat[obj[num]] = num;
else
sortByCat[obj[num]] += ', ' + num;
}
}
var catString = ''
for (var catData in sortByCat) {
if (sortByCat.hasOwnProperty(catData)) {
catString += catData + ': ' + sortByCat[catData] + '; ';
}
}
基本上將其轉換為以貓為鍵的哈希值,並將數字附加為值。 然后轉換為字符串,以便可以打印它。
像這樣的東西:
var map = {};
var obj = { "290" : "Cat1", "293" : "Cat2", "295" : "Cat1" };
for (var i in obj)
{
var val = obj[i];
if (!map[val]) map[val] = [];
map[val].push(i);
}
console.log(map);
應該這樣做:
var obj = { "290": "Cat1", "293": "Cat2", "295": "Cat1", "291": "Cat1", "292": "Cat2", "297": "Cat3" } var res = JSON.stringify(Object.keys(obj).reduce(function(res, key) { if (res[obj[key]]) res[obj[key]].push(key) else res[obj[key]] = [key]; return res; }, {})).replace(/([,:])/g, "$1 ").replace(/],/g, "]; ").replace(/[{}\\[\\]"]/g, ""); document.body.innerHTML = res;
這是一個將分組數據返回到另一個對象的函數。
在http://jspin.com/fubeqeweqa中查看
var objectName = { "290": "Cat1", "293": "Cat2", "295": "Cat1" };
function groupByValue(_objectName) {
var sorted = {};
for (var obj in _objectName) {
sorted[_objectName[obj]] = sorted[_objectName[obj]] || [];
sorted[_objectName[obj]].push(obj);
}
return sorted;
}
//{"Cat1":["290","295"],"Cat2":["293"]}
var objectName = { "290" : "Cat1", "293" : "Cat2", "295" : "Cat1" };
// build a map where key is category name and value are its associated numbers
var categories = {};
for (var num in objectName) {
var name = objectName[num];
if (!categories.hasOwnProperty(name)) {
categories[name] = [];
}
categories[name].push(num);
}
// create formatted string
var sortByCat = '';
for (var name in categories) {
sortByCat += name + ': ' + categories[name].join(', ') + '; ';
}
console.log(sortByCat);
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