从这个最初的问题,我将如何在多个字段应用排序?

使用这种稍作调整的结构,我将如何排序城市(上升)和价格(下降)?

var homes = [
    {"h_id":"3",
     "city":"Dallas",
     "state":"TX",
     "zip":"75201",
     "price":"162500"},
    {"h_id":"4",
     "city":"Bevery Hills",
     "state":"CA",
     "zip":"90210",
     "price":"319250"},
    {"h_id":"6",
     "city":"Dallas",
     "state":"TX",
     "zip":"75000",
     "price":"556699"},
    {"h_id":"5",
     "city":"New York",
     "state":"NY",
     "zip":"00010",
     "price":"962500"}
    ];

我喜欢的事实是,给出的答案提供了一个一般的方法。在我计划使用这段代码的地方,我将不得不对日期以及其他东西进行排序。“启动”对象的能力似乎很方便,如果不是有点麻烦的话。

我试图把这个答案构建成一个很好的通用示例,但我运气不太好。


当前回答

哇,这里有一些复杂的解。如此复杂,我决定想出一些更简单但也相当强大的东西。在这里;

function sortByPriority(data, priorities) {
  if (priorities.length == 0) {
    return data;
  }

  const nextPriority = priorities[0];
  const remainingPriorities = priorities.slice(1);

  const matched = data.filter(item => item.hasOwnProperty(nextPriority));
  const remainingData = data.filter(item => !item.hasOwnProperty(nextPriority));

  return sortByPriority(matched, remainingPriorities)
    .sort((a, b) => (a[nextPriority] > b[nextPriority]) ? 1 : -1)
    .concat(sortByPriority(remainingData, remainingPriorities));
}

这里有一个如何使用它的例子。

const data = [
  { id: 1,                         mediumPriority: 'bbb', lowestPriority: 'ggg' },
  { id: 2, highestPriority: 'bbb', mediumPriority: 'ccc', lowestPriority: 'ggg' },
  { id: 3,                         mediumPriority: 'aaa', lowestPriority: 'ggg' },
];

const priorities = [
  'highestPriority',
  'mediumPriority',
  'lowestPriority'
];


const sorted = sortByPriority(data, priorities);

这将首先根据属性的优先级排序,然后根据属性的值进行排序。

其他回答

今天我做了一个相当通用的多特征排序器。你可以在这里看看byjs: https://github.com/Teun/thenBy.js

它允许您使用标准数组。排序,但使用firstBy(). thenby (). thenby()样式。它比上面发布的解决方案少了很多代码和复杂性。

下面的函数将允许您对一个或多个属性上的对象数组进行排序,对每个属性进行升序(默认值)或降序排序,并允许您选择是否执行区分大小写的比较。默认情况下,该函数执行不区分大小写的排序。

第一个参数必须是包含对象的数组。 后面的参数必须是一个以逗号分隔的字符串列表,这些字符串引用要排序的不同对象属性。最后一个参数(可选)是一个布尔值,用于选择是否执行区分大小写的排序——区分大小写的排序使用true。

默认情况下,该函数将按升序对每个属性/键排序。如果你想要一个特定的键按降序排序,那么取而代之的是传递一个这样格式的数组:['property_name', true]。

下面是该函数的一些示例用法,后面附有解释(其中homes是一个包含对象的数组):

objSort(homes, 'city')—>按城市排序(升序,不区分大小写)

objSort(homes, ['city', true])——>按城市排序(降序,不区分大小写)

objSort(homes, 'city', true)—>按城市然后价格排序(升序,区分大小写)

objSort(homes, 'city', 'price')——>先按城市再按价格排序(均为升序,不区分大小写)

objSort(homes, 'city', ['price', true])——>排序城市(升序)然后价格(降序),不区分大小写)

话不多说,下面是函数:

function objSort() {
    var args = arguments,
        array = args[0],
        case_sensitive, keys_length, key, desc, a, b, i;

    if (typeof arguments[arguments.length - 1] === 'boolean') {
        case_sensitive = arguments[arguments.length - 1];
        keys_length = arguments.length - 1;
    } else {
        case_sensitive = false;
        keys_length = arguments.length;
    }

    return array.sort(function (obj1, obj2) {
        for (i = 1; i < keys_length; i++) {
            key = args[i];
            if (typeof key !== 'string') {
                desc = key[1];
                key = key[0];
                a = obj1[args[i][0]];
                b = obj2[args[i][0]];
            } else {
                desc = false;
                a = obj1[args[i]];
                b = obj2[args[i]];
            }

            if (case_sensitive === false && typeof a === 'string') {
                a = a.toLowerCase();
                b = b.toLowerCase();
            }

            if (! desc) {
                if (a < b) return -1;
                if (a > b) return 1;
            } else {
                if (a > b) return -1;
                if (a < b) return 1;
            }
        }
        return 0;
    });
} //end of objSort() function

下面是一些样本数据:

var homes = [{
    "h_id": "3",
    "city": "Dallas",
    "state": "TX",
    "zip": "75201",
    "price": 162500
}, {
    "h_id": "4",
    "city": "Bevery Hills",
    "state": "CA",
    "zip": "90210",
    "price": 1000000
}, {
    "h_id": "5",
    "city": "new york",
    "state": "NY",
    "zip": "00010",
    "price": 1000000
}, {
    "h_id": "6",
    "city": "Dallas",
    "state": "TX",
    "zip": "85000",
    "price": 300000
}, {
    "h_id": "7",
    "city": "New York",
    "state": "NY",
    "zip": "00020",
    "price": 345000
}];
// custom sorting by city
const sortArray = ['Dallas', 'New York', 'Beverly Hills'];

const sortData = (sortBy) =>
  data
    .sort((a, b) => {
      const aIndex = sortBy.indexOf(a.city);
      const bIndex = sortBy.indexOf(b.city);

      if (aIndex < bIndex) {
        return -1;
      }

      if (aIndex === bIndex) {
        // price descending
        return b.price- a.price;
      }

      return 1;
    });

sortData(sortArray);

这里有一个简单的泛型函数方法。使用数组指定排序顺序。前置减号以指定降序。

var homes = [
    {"h_id":"3", "city":"Dallas", "state":"TX","zip":"75201","price":"162500"},
    {"h_id":"4","city":"Bevery Hills", "state":"CA", "zip":"90210", "price":"319250"},
    {"h_id":"6", "city":"Dallas", "state":"TX", "zip":"75000", "price":"556699"},
    {"h_id":"5", "city":"New York", "state":"NY", "zip":"00010", "price":"962500"}
    ];

homes.sort(fieldSorter(['city', '-price']));
// homes.sort(fieldSorter(['zip', '-state', 'price'])); // alternative

function fieldSorter(fields) {
    return function (a, b) {
        return fields
            .map(function (o) {
                var dir = 1;
                if (o[0] === '-') {
                   dir = -1;
                   o=o.substring(1);
                }
                if (a[o] > b[o]) return dir;
                if (a[o] < b[o]) return -(dir);
                return 0;
            })
            .reduce(function firstNonZeroValue (p,n) {
                return p ? p : n;
            }, 0);
    };
}

编辑:在ES6中它甚至更短!

"use strict"; const fieldSorter = (fields) => (a, b) => fields.map(o => { let dir = 1; if (o[0] === '-') { dir = -1; o=o.substring(1); } return a[o] > b[o] ? dir : a[o] < b[o] ? -(dir) : 0; }).reduce((p, n) => p ? p : n, 0); const homes = [{"h_id":"3", "city":"Dallas", "state":"TX","zip":"75201","price":162500}, {"h_id":"4","city":"Bevery Hills", "state":"CA", "zip":"90210", "price":319250},{"h_id":"6", "city":"Dallas", "state":"TX", "zip":"75000", "price":556699},{"h_id":"5", "city":"New York", "state":"NY", "zip":"00010", "price":962500}]; const sortedHomes = homes.sort(fieldSorter(['state', '-price'])); document.write('<pre>' + JSON.stringify(sortedHomes, null, '\t') + '</pre>')

下面这个简单的解决方案怎么样:

const sortCompareByCityPrice = (a, b) => {
    let comparison = 0
    // sort by first criteria
    if (a.city > b.city) {
        comparison = 1
    }
    else if (a.city < b.city) {
        comparison = -1
    }
    // If still 0 then sort by second criteria descending
    if (comparison === 0) {
        if (parseInt(a.price) > parseInt(b.price)) {
            comparison = -1
        }
        else if (parseInt(a.price) < parseInt(b.price)) {
            comparison = 1
        }
    }
    return comparison 
}

基于这个问题javascript排序数组的多个(数字)字段