Question

我需要帮助整理基于多个条件的数组搜索。此外，所有条件都是有条件的，这意味着我可能需要也可能不需要对这些条件进行过滤。我有什么：

要过滤的对象数组：

var data = [{
    "_id" : ObjectId("583f6e6d14c8042dd7c979e6"),
    "transid" : 1,
    "acct" : "acct1",
    "transdate" : ISODate("2012-01-31T05:00:00.000Z"),
    "category" : "category1",
    "amount" : 103
},
{
    "_id" : ObjectId("583f6e6d14c8042dd7c2132t6"),
    "transid" : 2,
    "acct" : "acct2",
    "transdate" : ISODate("2012-01-31T05:00:00.000Z"),
    "category" : "category2",
    "amount" : 103
},
{
    "_id" : ObjectId("583f6e6d14c8042dd7c2132t6"),
    "transid" : 3,
    "acct" : "acct2",
    "transdate" : ISODate("2016-07-31T05:00:00.000Z"),
    "category" : "category1",
    "amount" : 103
},
{
    "_id" : ObjectId("583f6e6d14c8042dd7c2132t6"),
    "transid" : 4,
    "acct" : "acct2",
    "transdate" : ISODate("2012-01-31T05:00:00.000Z"),
    "category" : "category2",
    "amount" : 103
},
{
    "_id" : ObjectId("583f6e6d14c8042dd7c2132t6"),
    "transid" : 5,
    "acct" : "acct2",
    "transdate" : ISODate("2012-01-31T05:00:00.000Z"),
    "category" : "category3",
    "amount" : 103
},
{
    "_id" : ObjectId("583f6e6d14c8042dd7c152g2"),
    "transid" : 6,
    "acct" : "acct3",
    "transdate" : ISODate("2016-10-31T05:00:00.000Z"),
    "category" : "category3",
    "amount" : 103
}]

我根据另一个混合元素数组过滤上面的对象数组。元素代表以下搜索字段：

“searchstring”：搜索数据数组中的所有字段匹配的文本序列
具有键值的对象，代表帐户类型以及true或false 表示是否应该用于过滤
startdate过滤转换
enddate过滤transdate
要在

具有搜索条件的数组如下所示（但如果某些字段不是必需的，则它们将设置为undefined或仅设置为空字符串或数组）：

var filtercondition = {
    "p",
    {acct1:true,acct2:false,acct3:true...}
    "2016-06-01",
    "2016-11-30",
    "category3"
}

实现这一目标的最佳方法是什么？我设计的是对滤波器数组中的每个元素进行单独搜索，但这似乎不是最优的并且非常繁琐。我愿意重新设计我的设置......

Answer 1

// You wrote that it's an array, so changed the braces 
var filtercondition = ["p",
{acct1:true,acct2:false,acct3:true...}
"2016-06-01",
"2016-11-30",
"category3"
];

var filtered = data.filter(o => {
    if(filtercondition[0] && !o.category.includes(filtercondition[o])) { // checking just the category, but you can check if any of more fields contains the conditions 
        return false;
    }
    if(filtercondition[1]) {
        for(var key in filtercondition[1]) {
        if(filtercondition[1][key] === true && o.acct != key) {
            return false;
        }
        }
    }
    if(filtercondition[2] && o.transdate < filtercondition[2]) {
        return false;
    }
    if(filtercondition[3] && o.transdate > filtercondition[3]) {
        return false;
    }
    if(filtercondition[4] && o.category !== filtercondition[4]) {
        return false;
    }

    return true;
});

两个说明： - 更改了filtercondition的大括号，以便它是一个数组，但我建议使用一个对象。 - 此{acct1:true,acct2:false,acct3:true...}示例对我没有意义，因为它表明acct字段应同时为acct1和acct3。

Answer 2

首先，您需要为数组使用括号而不是花括号：

var filtercondition = [
    "p",
    {acct1:true,acct2:false,acct3:true...},
    "2016-06-01",
    "2016-11-30",
    "category3"
];

然后，我不认为数组是最好的数据类型。尝试这样的对象：

var filtercondition = {
    query: "p",
    accounts: {acct1:true,acct2:false,acct3:true...},
    date1: "2016-06-01",
    date2: "2016-11-30",
    category: "category3"
};

然后，尝试使用Array.prototype.filter：

var filtered = data.filter(function(obj) {
    for (var key in filtercondition) {
        // if condition not met return false
    }
    return true;
});

Answer 3

创建一个函数数组，每个函数代表一个条件。

以下是一些演示该方法的示例代码......

 var conditions = [];

 // Dynamically build the list of conditions
 if(startDateFilter) {
    conditions.push(function(item) { 
       return item.transdate >= startDateFilter.startDate;
    });
 };

 if(categoryFilter) {
     conditions.push(function(item) {
         return item.cateogry === categoryFilter.category;
     });
 };
 // etc etc

一旦有了一系列条件，就可以使用Array.prototype.every来运行项目的每个条件。

 var itemsMatchingCondition = data.filter(function(d) {
     return conditions.every(function(c) {
         return c(d);
     });
 });

Answer 4

首先，一些要点：

如果您要在浏览器中使用它，则data对象无效。可能数据来自MongoDB，对吗？您的后端（数据源）应该有一种方法可以正确编码并删除ObjectID和ISODate引用。
您的filtercondition不是有效的JavaScript对象/ JSON。检查我的例子。

因此，您可以使用Array#filter方法过滤数据数组。

类似的东西：

let data = [{
    "_id" : "583f6e6d14c8042dd7c979e6",
    "transid" : 1,
    "acct" : "acct1",
    "transdate" : "2012-01-31T05:00:00.000Z",
    "category" : "category1",
    "amount" : 103
},
{
    "_id" : "583f6e6d14c8042dd7c2132t6",
    "transid" : 2,
    "acct" : "acct2",
    "transdate" : "2012-01-31T05:00:00.000Z",
    "category" : "category2",
    "amount" : 103
},
{
    "_id" : "583f6e6d14c8042dd7c2132t6",
    "transid" : 5,
    "acct" : "acct2",
    "transdate" : "2012-01-31T05:00:00.000Z",
    "category" : "category3",
    "amount" : 103
}];


let filterToApply = {
    acct: {
        acct1: true,
        acct2: false,
        acct3: true
    },
    initialDate: "2016-06-01",
    finalDate: "2016-11-30",
    category: "category3"
}


let filterData = (array, filter) => {

    return array.filter( (item) => {

        /* here, you iterate each item and compare with your filter,
           if the item pass, you must return true. Otherwise, false */


        /* e.g.: category check (if present only) */
        if (filter.category && filter.category !== item.category) 
            return false;
        }

        /* add other criterias check... */ 

        return true;
});

}

let dataFiltered = filterData(data, filterToApply);
console.log(dataFiltered);

Answer 5

我会使用一些小粒度函数并组合它们。

import sys
from PyQt5 import QtWidgets


class IndicSelectWindow(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(IndicSelectWindow, self).__init__(parent=parent)
        self.resize(500, 400)
        self.layout = QtWidgets.QHBoxLayout(self)
        self.scrollArea = QtWidgets.QScrollArea(self)
        self.scrollArea.setWidgetResizable(True)
        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.gridLayout = QtWidgets.QGridLayout(self.scrollAreaWidgetContents)
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.layout.addWidget(self.scrollArea)

        for i in range(100):
            for j in range(100):
                self.gridLayout.addWidget(QtWidgets.QPushButton(), i, j)

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    w = IndicSelectWindow()
    w.show()
    sys.exit(app.exec_())

和示例组合：

//only some utilities, from the top of my mind
var identity = v => v;

//string-related
var string = v => v == null? "": String(v);
var startsWith = needle => haystack => string(haystack).startsWith(needle);
var endsWith = needle => haystack => string(haystack).endsWith(needle);
var contains = needle => haystack => string(haystack).contains(needle);

//do sth with an object
var prop = key => obj => obj != null && prop in obj? obj[prop]: undefined;
var someProp = fn => obj => obj != null && Object.keys(obj).some(k => fn(k) );
var someValue = fn => obj => obj != null && Object.keys(obj).some(k => fn(obj[k]) );

//logic
var eq => a => b => a === b;
var not => fn => function(){ return fn.apply(this, arguments) };
var and = (...funcs) => funcs.reduce((a, b) => function(){
        return a.apply(this, arguments) && b.apply(this, arguments);
    });

var or = (...funcs) => funcs.reduce((a, b) => function(){
        return a.apply(this, arguments) || b.apply(this, arguments);
    });

//composition
var compose = (...funcs) => funcs.reduce((a, b) => v => return a(b(v)));
var chain = (...funcs) => funcs.reduceRight((a, b) => v => return a(b(v)));

//and whatever else you want/need
//but stay granular, don't put too much logic into a single function

因为我不知道你是如何构建你的过滤条件的，所以我不能确切地告诉你如何将它们解析成这样的组合，但是你可以像这样编写它们：

var filterFn = and(
    //some value contains "p"
    someValue(contains("p")),

    //and
    chain(
        //property "foo"
        prop("foo"), 
        or(
            //either contains "asdf"
            contains("asdf"),

            //or startsWith "123"
            startsWith("123")
        )
    ),
)

等等

Javascript多条件数组过滤器

5 个答案: