当对象键值在数组中时如何过滤数组 [英] How to filter array when object key value is in array

问题描述

我有一个数组模型如下:

I have an array model as below:

records:[{
    "empid":1,
    "fname": "X",
    "lname": "Y"
},
{
    "empid":2,
    "fname": "A",
    "lname": "Y"
},
{
    "empid":3,
    "fname": "B",
    "lname": "Y"
},
{
    "empid":4,
    "fname": "C",
    "lname": "Y"
},
{
    "empid":5,
    "fname": "C",
    "lname": "Y"
}
]

现在我有一组empid的[1,4,5].

Now I have an array of empid's [1,4,5].

所以现在我需要过滤包含第二个中所有键的第一个数组.

So now I need to filter the first array which contains all the keys in my second.

输出:

records:[{
    "empid":1,
    "fname": "X",
    "lname": "Y"
},
{
    "empid":4,
    "fname": "C",
    "lname": "Y"
},
{
    "empid":5,
    "fname": "C",
    "lname": "Y"
}
]

我可以使用 angular 中的 forEach 循环来做到这一点，但因为我的模型对象中有 100 多条记录.我需要一个关于如何以更好的方式处理这个问题的建议.

I can do this using a forEach loop in angular but as I have more than 100 records in my model object. I need a suggestion on how to handle this in much better way.

我正在考虑创建自定义过滤器，但您对此有何看法.(如果是，请提供示例代码以实现此目的).

I am thinking of creating a custom filter, but what is your take on it.(If yes please provide sample code to achieve this).

推荐答案

你可以用 Array.prototype.filter(),

var data = { records : [{ "empid": 1, "fname": "X", "lname": "Y" }, { "empid": 2, "fname": "A", "lname": "Y" }, { "empid": 3, "fname": "B", "lname": "Y" }, { "empid": 4, "fname": "C", "lname": "Y" }, { "empid": 5, "fname": "C", "lname": "Y" }] }
var empIds = [1,4,5]
var filteredArray = data.records.filter(function(itm){
  return empIds.indexOf(itm.empid) > -1;
});

filteredArray = { records : filteredArray };

如果 callBack 返回一个 true 值，则itm 传递给那个特定的 callBack 将被过滤掉.您可以在此处阅读更多相关信息.

If​ the ​callBack​ returns a ​true​ value, then the ​itm​ passed to that particular callBack will be filtered out. You can read more about it here.​​​​​​

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