如何从具有对象数组的对象访问数据javascript

时间：2019-01-29 03:58:36

标签： javascript arrays object

有人可以帮我提供一些有关如何从具有对象数组的对象访问数据的代码吗？这是我的数组：

{
    "data": [{
        "order_id": "336566",
        "customer_name": "joel",
        "customer_surname": "kabeya",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2019-01-21 15:00:27",
        "delivery_date": "2019-01-24",
        "delivery_from": "10:30",
        "delivery_to": "12:00",
        "completed": "1",
        "shopper": "joel"
    }, {
        "order_id": "335719",
        "customer_name": "joel",
        "customer_surname": "kabeya",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2018-12-24 13:46:27",
        "delivery_date": "2018-12-30",
        "delivery_from": "10:30",
        "delivery_to": "12:00",
        "completed": "1",
        "shopper": "joel"
    }, {
        "order_id": "336531",
        "customer_name": "Tay",
        "customer_surname": "Z",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2019-01-11 08:42:27",
        "delivery_date": "2019-01-17",
        "delivery_from": "10:30",
        "delivery_to": "12:00",
        "completed": "1",
        "shopper": "joel"
    }, {
        "order_id": "336545",
        "customer_name": "joel",
        "customer_surname": "kabeya",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2019-01-17 19:00:27",
        "delivery_date": "2019-01-18",
        "delivery_from": "11:00",
        "delivery_to": "12:00",
        "completed": "0",
        "shopper": "joel"
    }, {
        "order_id": "241918",
        "customer_name": "Marietjie",
        "customer_surname": "Short",
        "total_items": "44",
        "completed_items": "7",
        "percent_complete": 0.15909090909091,
        "datetime_received": "2018-07-25 15:18:25",
        "delivery_date": "2018-10-29",
        "delivery_from": "12:00",
        "delivery_to": "13:00",
        "completed": "0",
        "shopper": "Tay"
    }, {
        "order_id": "281774",
        "customer_name": "Ashleigh",
        "customer_surname": "Hodge",
        "total_items": "16",
        "completed_items": "0",
        "percent_complete": 0,
        "datetime_received": "2018-10-04 15:59:19",
        "delivery_date": "2018-10-29",
        "delivery_from": "12:00",
        "delivery_to": "13:00",
        "completed": "0",
        "shopper": null
    }, {
        "order_id": "336544",
        "customer_name": "joel",
        "customer_surname": "kabeya",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2019-01-17 08:00:27",
        "delivery_date": "2019-01-19",
        "delivery_from": "13:00",
        "delivery_to": "14:00",
        "completed": "0",
        "shopper": "joel"
    }]
}

所以我也想获取数组的长度，以访问诸如customer_name等的子属性

4 个答案:

答案 0 :(得分：0)

您需要使用属性accessors。您可能还需要阅读Object Basics。

try
{
    connectionn.Open();

    OleDbCommand command = new OleDbCommand();
    command.Connection = connectionn;

    string query = "update LOGIN set pass='" + Npassword.Text + "' WHERE pass=@Npassword.Text";

    command.CommandText = query;
    command.ExecuteNonQuery();

    MessageBox.Show("Password Changed");
    connectionn.Close();
}
catch (Exception ex)
{
   MessageBox.Show("Error, fill the fields required" + ex);
   connectionn.Close();
}

答案 1 :(得分：0)

data键的对象值内部是一个对象数组。因此，为了访问诸如customer_name之类的任何键，可以使用dot (.)或square[]表示法。您可以按照以下link来找出两者之间的区别

let myData = {
  "data": [{
    "order_id": "336566",
    "customer_name": "joel",
    "customer_surname": "kabeya",
    "total_items": "0",
    "completed_items": "0",
    "percent_complete": 1,
    "datetime_received": "2019-01-21 15:00:27",
    "delivery_date": "2019-01-24",
    "delivery_from": "10:30",
    "delivery_to": "12:00",
    "completed": "1",
    "shopper": "joel"
  }, {
    "order_id": "335719",
    "customer_name": "joel",
    "customer_surname": "kabeya",
    "total_items": "0",
    "completed_items": "0",
    "percent_complete": 1,
    "datetime_received": "2018-12-24 13:46:27",
    "delivery_date": "2018-12-30",
    "delivery_from": "10:30",
    "delivery_to": "12:00",
    "completed": "1",
    "shopper": "joel"
  }, {
    "order_id": "336531",
    "customer_name": "Tay",
    "customer_surname": "Z",
    "total_items": "0",
    "completed_items": "0",
    "percent_complete": 1,
    "datetime_received": "2019-01-11 08:42:27",
    "delivery_date": "2019-01-17",
    "delivery_from": "10:30",
    "delivery_to": "12:00",
    "completed": "1",
    "shopper": "joel"
  }, {
    "order_id": "336545",
    "customer_name": "joel",
    "customer_surname": "kabeya",
    "total_items": "0",
    "completed_items": "0",
    "percent_complete": 1,
    "datetime_received": "2019-01-17 19:00:27",
    "delivery_date": "2019-01-18",
    "delivery_from": "11:00",
    "delivery_to": "12:00",
    "completed": "0",
    "shopper": "joel"
  }, {
    "order_id": "241918",
    "customer_name": "Marietjie",
    "customer_surname": "Short",
    "total_items": "44",
    "completed_items": "7",
    "percent_complete": 0.15909090909091,
    "datetime_received": "2018-07-25 15:18:25",
    "delivery_date": "2018-10-29",
    "delivery_from": "12:00",
    "delivery_to": "13:00",
    "completed": "0",
    "shopper": "Tay"
  }, {
    "order_id": "281774",
    "customer_name": "Ashleigh",
    "customer_surname": "Hodge",
    "total_items": "16",
    "completed_items": "0",
    "percent_complete": 0,
    "datetime_received": "2018-10-04 15:59:19",
    "delivery_date": "2018-10-29",
    "delivery_from": "12:00",
    "delivery_to": "13:00",
    "completed": "0",
    "shopper": null
  }, {
    "order_id": "336544",
    "customer_name": "joel",
    "customer_surname": "kabeya",
    "total_items": "0",
    "completed_items": "0",
    "percent_complete": 1,
    "datetime_received": "2019-01-17 08:00:27",
    "delivery_date": "2019-01-19",
    "delivery_from": "13:00",
    "delivery_to": "14:00",
    "completed": "0",
    "shopper": "joel"
  }]
}

console.log('Length of data array ', myData.data.length)

// this will get customer_name

myData.data.forEach(function(item) {
  console.log(item.customer_name)
})

答案 2 :(得分：0)

由于最近我做了类似的事情，因此我可以帮助您开始一些工作。我不是专家之一，我也在学习。因此，我将您的阵列压缩为以下内容，仅用于测试。

然后，我提供了一个用于数组的基本for循环以及Object.values，它们仅显示数组中对象的属性。有许多种访问此数据的方法，但是经验丰富的人将能够提供更多帮助。

let data = [
      {
        order_id: "336566",
        customer_name: "joel",
        customer_surname: "kabeya",
        total_items: "0"
      },
      {
        order_id: "335719",
        customer_name: "joel",
        customer_surname: "kabeya",
        total_items: "0",
        completed_items: "0",
        percent_complete: 1,
        datetime_received: "2018-12-24 13:46:27"
      },
      {
        order_id: "336531",
        customer_name: "Tay",
        customer_surname: "Z",
        total_items: "0",
        completed_items: "0",
        percent_complete: 1
      }
    ];

      for(var i = 0; i < data.length; i++){
        console.log(Object.values(data[i]));  //or however you choose to display it
      }

此外... data.length将为您提供对象数。我不确定如何获取键或属性的数量。

答案 3 :(得分：0)

嵌套的for in循环将为您解决问题。 希望这会有所帮助

var res = {
    "data": [{
        "order_id": "241918",
        "customer_name": "Marietjie",
        "customer_surname": "Short",
        "total_items": "44",
        "completed_items": "7",
        "percent_complete": 0.15909090909091,
        "datetime_received": "2018-07-25 15:18:25",
        "delivery_date": "2018-10-29",
        "delivery_from": "12:00",
        "delivery_to": "13:00",
        "completed": "0",
        "shopper": "Tay"
    },{
        "order_id": "336544",
        "customer_name": "joel",
        "customer_surname": "kabeya",
        "total_items": "0",
        "completed_items": "0",
        "percent_complete": 1,
        "datetime_received": "2019-01-17 08:00:27",
        "delivery_date": "2019-01-19",
        "delivery_from": "13:00",
        "delivery_to": "14:00",
        "completed": "0",
        "shopper": "joel"
    }]
}


for(var char in res){
    for(var obj in res[char]){
        // Log all the customer names for example.
        console.log(JSON.stringify(res[char][obj].customer_name));
    }
}

对于in循环来说，这是一种循环对象的好方法。

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