使用带条件的循环创建 Javascript 对象

Question

我有一个 sql table 看起来像这样 :

+------+------------+---------+---------------------+-----------+
| SrNo | BidderName | BidAmt  |       BidDate       | BidTicks  |
+------+------------+---------+---------------------+-----------+
|    1 | ARBAAZ     | 500.00  | Apr 30 2015 10:27AM | 348854000 |
|    2 | SHEKHAR    | 600.00  | Apr 30 2015 10:28AM | 348845000 |
|    3 | SHEKHAR    | 800.00  | Apr 30 2015 10:28AM | 348838000 |
+------+------------+---------+---------------------+-----------+

我正在以 JSON 格式将其发送到我的客户端。

我可以通过以下方式获取值：

var data;

Table.forEach(function (field) {
    var name = field.BidderName;
    var amount = field.BidAmt;
    data = "";
});

我正在尝试从 Table 为我的浮点图创建一个看起来像这样的对象：

var dataset = [
    {
        label: "ARBAAZ",
        data: [[348854000, 500.00]],//created from [bidticks,bidamt]
        color: "#FF0000",
        points: { fillColor: "#FF0000", show: true },
        lines: { show: true }
    },
    {
        label: "SHEKHAR",
        data: [[348845000, 600.00], [48838000, 800.00]],
        color: "#0062E3",
        points: { fillColor: "#0062E3", show: true },
        lines: { show: true }
    }
];

有什么想法，我该如何实现？

Answer 1

我不知道 json 对象中的确切数据结构。但是，我认为你可以这样做

   $.each(data, function(index, statistic) {
        if (statistic.BidderName == 'Team Red') {
            teamRed.push([statistic.BidAmt, statistic.timeStamp]);
        } else {
            teamBlue.push([statistic.BidAmt, statistic.timeStamp]);
        }
    });

现在您可以在 数据集 对象中使用 teamRed 和 teamBlue。

我假设您确实有这个 BidderName，它将区分此行属于蓝队还是红队。

Answer 2

假设您的 json 数据在 var 'data' 中，你可以通过 filter 函数循环，

  var seen = {};
    data = data.filter(function(entry) {
        var previous;

        // Have we seen this label before?
        if (seen.hasOwnProperty(entry.label)) {
            // Yes, grab it and add this data to it
            previous = seen[entry.label];
            var data = [entry.BidTicks, entry.BidAmt] ;
            previous.data.push(data);

            // Don't keep this entry, we've merged it into the previous one
            return false;
        }    

        // entry.data probably isn't an array; make it one for consistency

        entry.data = [];
        var data = [entry.BidTicks, entry.BidAmt] ;
        entry.data.push(data);

        //delete the attributes which are not required in final output
        delete entry.BidTicks;
        delete entry.BidAmt;

        // Remember that we've seen it
        seen[entry.label] = entry;

        // Keep this one, we'll merge any others that match into it
        return true;
    });

工作 fiddle 在这里 --> fiddle to filter the array of objects

关于您的额外属性 'color'、'lines' 等，我相信您现在可以将它们带入最终输出。

使用带条件的循环创建 Javascript 对象

Creating Javascript object using loop with conditions

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