按键求和jQuery对象中的值 [英] Sum values in jQuery object by key

问题描述

我有一个使用jQuery CSV转换为jQuery对象的csv文件( https://github.com /evanplaice/jquery-csv/).

I have a csv file converted to a jQuery object using jQuery CSV (https://github.com/evanplaice/jquery-csv/).

这是代码:

    $.ajax({
        type: "GET",
        url: "/path/myfile.csv",
        dataType: "text",
        success: function(data) {
        // once loaded, parse the file and split out into data objects
        // we are using jQuery CSV to do this (https://github.com/evanplaice/jquery-csv/)

        var data = $.csv.toObjects(data);
    });

我需要通过键入对象来汇总值.具体来说，我需要按公司将bushels_per_day值相加.

I need to sum up values by key in the object. Specifically, I need to add up the bushels_per_day values by company.

对象格式如下:

    var data = [
        "0":{
            beans: "",
            bushels_per_day: "145",
            latitude: "34.6059253",
            longitude: "-86.9833417",
            meal: "",
            oil: "",
            plant_city: "Decatur",
            plant_company: "AGP",
            plant_state: "AL",
            processor_downtime: "",
        },
        // ... more objects
    ]

这不起作用:

    $.each(data, function(index, value) { 
        var capacity = value.bushels_per_day;
        var company = value.plant_company.replace(/\W+/g, '_').toLowerCase();
        var sum = 0;
        if (company == 'agp') {
            sum += capacity;
            console.log(sum);
        }
    });

它只返回公司前导零的每个值:

It just returns the value for each with a leading zero by company:

0145

0120

060

等

我该怎么做?

推荐答案

您需要使用parseInt()将字符串转换为数字.否则，, +`会进行字符串连接而不是加法.

You need to use parseInt() to convert the strings to numbers. Otherwise,+` does string concatenation instead of addition.

此外，您需要在循环外初始化sum.否则，您的总和每次都会被清除，并且您不是在计算总和.

Also, you need to initialize sum outside the loop. Otherwise, your sum gets cleared every time, and you're not calculating a total.

var sum = 0;
$.each(data, function(index, value) { 
    var capacity = parseInt(value.bushels_per_day, 10);
    var company = value.plant_company.replace(/\W+/g, '_').toLowerCase();
    if (company == 'agp') {
        sum += capacity;
        console.log(sum);
    }
});

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