堆棧內存溢出
  簡體   English   中英

訪問唯一的嵌套JSON數組項

[英]Accessing unique nested JSON array items

 原文  2018-11-14 21:16:22  2   3    javascript/ json

問題描述

我試圖深入研究以下數組，以在解析完所有連接器類型項后將其變為選擇選項。

目前，我可以獲取所需的所有數據，但我想將返回的每個項目都轉換為單個字符串，而不是讓它返回具有多個連接器類型的項目作為單個項目（示例顯示以下內容）我目前有/渴望，並且只顯示唯一的類型，因此，如果連接器名稱已顯示一次，則不要再顯示該名稱作為選項。

例如（當前輸出）：

（顯示重復項，類型不只一種的嵌套項不會分解成一行） 

ConnectorType1
ConnectorType1, ConnectorType2, ConnectorType3
ConnectorType1
ConnectorType1, ConnectorType2

所需的輸出：

（僅顯示唯一項，所有結果都換行。） 

ConnectorType1,
ConnectorType2,
ConnectorType3

Pastebin與JSON示例： 

{
    "ChargeDevice": [
        {
            "ChargeDeviceId": "cfeedcdd5e287bef4b583158a12363f1",
            "ChargeDeviceRef": "SRC_LDN60188",
            "ChargeDeviceName": "2 Riddons Road",
            "ChargeDeviceText": null,
            "ChargeDeviceLocation": {
                "Latitude": "51.431454",
                "Longitude": "0.031175",
                "Address": {
                    "SubBuildingName": null,
                    "BuildingName": "",
                    "BuildingNumber": "",
                    "Thoroughfare": "Riddons Road",
                    "Street": "Junction with Chinbrook Road",
                    "DoubleDependantLocality": null,
                    "DependantLocality": null,
                    "PostTown": "Leek",
                    "County": "Greater London",
                    "PostCode": "SE12 9QR",
                    "Country": "gb",
                    "UPRN": null
                },
                "LocationShortDescription": null,
                "LocationLongDescription": ""
            },
            "ChargeDeviceManufacturer": null,
            "ChargeDeviceModel": null,
            "PublishStatusID": "1",
            "DateCreated": "2014-08-19 05:15:02",
            "DateUpdated": "2015-09-02 11:28:16",
            "Attribution": "Source London",
            "DateDeleted": "n/a",
            "Connector": [
                {
                    "ConnectorId": "1",
                    "ConnectorType": "3-pin Type G (BS1363)",
                    "RatedOutputkW": "3.7",
                    "RatedOutputVoltage": "230",
                    "RatedOutputCurrent": "16",
                    "ChargeMethod": "Single Phase AC",
                    "ChargeMode": "1",
                    "ChargePointStatus": "In service",
                    "TetheredCable": "0",
                    "Information": "  x 3-pin square (BS 1363) - Standard (up to 3.7kW, 13-16A)",
                    "Validated": "0"
                },
                {
                    "ConnectorId": "2",
                    "ConnectorType": "Type 2 Mennekes (IEC62196)",
                    "RatedOutputkW": "7.0",
                    "RatedOutputVoltage": "230",
                    "RatedOutputCurrent": "32",
                    "ChargeMethod": "Single Phase AC",
                    "ChargeMode": "3",
                    "ChargePointStatus": "In service",
                    "TetheredCable": "0",
                    "Information": "  x 7-pin 'Smart' eg Mennekes (IEC 62196) - Fast (7kW, 32A)",
                    "Validated": "0"
                }
            ],
            "DeviceOwner": {
                "OrganisationName": "Source London",
                "SchemeCode": "SRC_LDN",
                "Website": "https://www.sourcelondon.net",
                "TelephoneNo": "020 3056 8989"
            },
            "DeviceController": {
                "OrganisationName": "Source London",
                "SchemeCode": "SRC_LDN",
                "Website": "https://www.sourcelondon.net",
                "TelephoneNo": "020 3056 8989"
            },
            "DeviceAccess": [],
            "DeviceNetworks": "Source London",
            "ChargeDeviceStatus": "In service",
            "PublishStatus": "Published",
            "DeviceValidated": "0",
            "RecordModerated": "Y",
            "RecordLastUpdated": "2015-09-02 11:28:16",
            "RecordLastUpdatedBy": "NCR Admin",
            "PaymentRequiredFlag": false,
            "PaymentDetails": "",
            "SubscriptionRequiredFlag": true,
            "SubscriptionDetails": "\u00a35 per annum for RFiD card",
            "ParkingFeesFlag": false,
            "ParkingFeesDetails": "",
            "ParkingFeesUrl": null,
            "AccessRestrictionFlag": false,
            "AccessRestrictionDetails": "",
            "PhysicalRestrictionFlag": false,
            "PhysicalRestrictionText": "",
            "OnStreetFlag": true,
            "LocationType": "On-street",
            "Bearing": null,
            "Accessible24Hours": false
        }
    ]
}

用於遍歷JSON的當前代碼： 

for (let x = 0; x < data.ChargeDevice[i].Connector.length; x++) {
          if (connectors.indexOf(data.ChargeDevice[i].Connector[x].ConnectorType) === -1) {
            connectors.push(data.ChargeDevice[i].Connector[x].ConnectorType);
            $('#connectorList').append(`<option data-loc-name="${connectors}" value="${connectors}">${connectors}</option>`);
          }
        }

3 個解決方案

解決方案1
 1  2018-11-14 21:25:55

您可以選擇一個Set並檢查該項目是否不在Set中，然后使用該項目並將其添加到Set中。 

 var array = [{ connector: ['ConnectorType1'] }, { connector: ['ConnectorType1', 'ConnectorType2', 'ConnectorType3'] }, { connector: ['ConnectorType1'] }, { connector: ['ConnectorType1', 'ConnectorType2'] }], connectors = new Set; array.forEach(({ connector }) => connector.forEach(c => { if (connectors.has(c)) return; console.log(c); connectors.add(c); }));

解決方案2
 1 已采納  2018-11-14 21:40:34

我建議您遍歷Array.from(myJson.ChargeDevice[0].Connector, ...所有連接。

然后，對於每個連接，則push的值.ConnectorType到一個數組（ myConnArr ），如果它不是已存在。 像這樣if(!myConnArr.includes(conn.ConnectorType)) myConnArr.push(conn.ConnectorType)

最后，我join所有結果，並像.join(", \\n")這樣將它們分開。

完整的代碼段。 為了進行測試，我復制了一些連接器值，以顯示remove_duplicates()正常工作。 

 let myJson = { "ChargeDevice": [ { "ChargeDeviceId": "cfeedcdd5e287bef4b583158a12363f1", "ChargeDeviceRef": "SRC_LDN60188", "ChargeDeviceName": "2 Riddons Road", "ChargeDeviceText": null, "ChargeDeviceLocation": { "Latitude": "51.431454", "Longitude": "0.031175", "Address": { "SubBuildingName": null, "BuildingName": "", "BuildingNumber": "", "Thoroughfare": "Riddons Road", "Street": "Junction with Chinbrook Road", "DoubleDependantLocality": null, "DependantLocality": null, "PostTown": "Leek", "County": "Greater London", "PostCode": "SE12 9QR", "Country": "gb", "UPRN": null }, "LocationShortDescription": null, "LocationLongDescription": "" }, "ChargeDeviceManufacturer": null, "ChargeDeviceModel": null, "PublishStatusID": "1", "DateCreated": "2014-08-19 05:15:02", "DateUpdated": "2015-09-02 11:28:16", "Attribution": "Source London", "DateDeleted": "n/a", "Connector": [ { "ConnectorId": "1", "ConnectorType": "3-pin Type G (BS1363)", "RatedOutputkW": "3.7", "RatedOutputVoltage": "230", "RatedOutputCurrent": "16", "ChargeMethod": "Single Phase AC", "ChargeMode": "1", "ChargePointStatus": "In service", "TetheredCable": "0", "Information": " x 3-pin square (BS 1363) - Standard (up to 3.7kW, 13-16A)", "Validated": "0" }, { "ConnectorId": "1", "ConnectorType": "3-pin Type G (BS1363)", "RatedOutputkW": "3.7", "RatedOutputVoltage": "230", "RatedOutputCurrent": "16", "ChargeMethod": "Single Phase AC", "ChargeMode": "1", "ChargePointStatus": "In service", "TetheredCable": "0", "Information": " x 3-pin square (BS 1363) - Standard (up to 3.7kW, 13-16A)", "Validated": "0" }, { "ConnectorId": "2", "ConnectorType": "Type 2 Mennekes (IEC62196)", "RatedOutputkW": "7.0", "RatedOutputVoltage": "230", "RatedOutputCurrent": "32", "ChargeMethod": "Single Phase AC", "ChargeMode": "3", "ChargePointStatus": "In service", "TetheredCable": "0", "Information": " x 7-pin 'Smart' eg Mennekes (IEC 62196) - Fast (7kW, 32A)", "Validated": "0" } ], "DeviceOwner": { "OrganisationName": "Source London", "SchemeCode": "SRC_LDN", "Website": "https://www.sourcelondon.net", "TelephoneNo": "020 3056 8989" }, "DeviceController": { "OrganisationName": "Source London", "SchemeCode": "SRC_LDN", "Website": "https://www.sourcelondon.net", "TelephoneNo": "020 3056 8989" }, "DeviceAccess": [], "DeviceNetworks": "Source London", "ChargeDeviceStatus": "In service", "PublishStatus": "Published", "DeviceValidated": "0", "RecordModerated": "Y", "RecordLastUpdated": "2015-09-02 11:28:16", "RecordLastUpdatedBy": "NCR Admin", "PaymentRequiredFlag": false, "PaymentDetails": "", "SubscriptionRequiredFlag": true, "SubscriptionDetails": "\£5 per annum for RFiD card", "ParkingFeesFlag": false, "ParkingFeesDetails": "", "ParkingFeesUrl": null, "AccessRestrictionFlag": false, "AccessRestrictionDetails": "", "PhysicalRestrictionFlag": false, "PhysicalRestrictionText": "", "OnStreetFlag": true, "LocationType": "On-street", "Bearing": null, "Accessible24Hours": false } ] }; let myConnArr = []; Array.from(myJson.ChargeDevice[0].Connector, conn => { if(!myConnArr.includes(conn.ConnectorType)) myConnArr.push(conn.ConnectorType) }); console.log(myConnArr.join(", \\n"));

解決方案3
 0  2018-11-14 21:24:48

不知道這是您要執行的操作，但是這里有一個函數可以返回ChargeDevice和一些測試中的唯一連接器數組。 

function getUniqueConnectors(data) {
        var connectors = [];
        for (let i in data.ChargeDevice) {
            for (let x = 0; x < data.ChargeDevice[i].Connector.length; x++) {
                if (connectors.indexOf(data.ChargeDevice[i].Connector[x].ConnectorType) === -1) {
                    connectors.push(data.ChargeDevice[i].Connector[x].ConnectorType);
                }
            }
        }
        return connectors;
    }

    var objectOne = {
        "ChargeDevice": [
            {
                "ChargeDeviceId": "cfeedcdd5e287bef4b583158a12363f1",
                "ChargeDeviceRef": "SRC_LDN60188",
                "ChargeDeviceName": "2 Riddons Road",
                "ChargeDeviceText": null,
                "ChargeDeviceLocation": {
                    "Latitude": "51.431454",
                    "Longitude": "0.031175",
                    "Address": {
                        "SubBuildingName": null,
                        "BuildingName": "",
                        "BuildingNumber": "",
                        "Thoroughfare": "Riddons Road",
                        "Street": "Junction with Chinbrook Road",
                        "DoubleDependantLocality": null,
                        "DependantLocality": null,
                        "PostTown": "Leek",
                        "County": "Greater London",
                        "PostCode": "SE12 9QR",
                        "Country": "gb",
                        "UPRN": null
                    },
                    "LocationShortDescription": null,
                    "LocationLongDescription": ""
                },
                "ChargeDeviceManufacturer": null,
                "ChargeDeviceModel": null,
                "PublishStatusID": "1",
                "DateCreated": "2014-08-19 05:15:02",
                "DateUpdated": "2015-09-02 11:28:16",
                "Attribution": "Source London",
                "DateDeleted": "n/a",
                "Connector": [
                    {
                        "ConnectorId": "1",
                        "ConnectorType": "3-pin Type G (BS1363)",
                        "RatedOutputkW": "3.7",
                        "RatedOutputVoltage": "230",
                        "RatedOutputCurrent": "16",
                        "ChargeMethod": "Single Phase AC",
                        "ChargeMode": "1",
                        "ChargePointStatus": "In service",
                        "TetheredCable": "0",
                        "Information": "  x 3-pin square (BS 1363) - Standard (up to 3.7kW, 13-16A)",
                        "Validated": "0"
                    },
                    {
                        "ConnectorId": "2",
                        "ConnectorType": "Type 2 Mennekes (IEC62196)",
                        "RatedOutputkW": "7.0",
                        "RatedOutputVoltage": "230",
                        "RatedOutputCurrent": "32",
                        "ChargeMethod": "Single Phase AC",
                        "ChargeMode": "3",
                        "ChargePointStatus": "In service",
                        "TetheredCable": "0",
                        "Information": "  x 7-pin 'Smart' eg Mennekes (IEC 62196) - Fast (7kW, 32A)",
                        "Validated": "0"
                    },
                    {
                        "ConnectorId": "2",
                        "ConnectorType": "Type 2 Mennekes (IEC62196)",
                        "RatedOutputkW": "7.0",
                        "RatedOutputVoltage": "230",
                        "RatedOutputCurrent": "32",
                        "ChargeMethod": "Single Phase AC",
                        "ChargeMode": "3",
                        "ChargePointStatus": "In service",
                        "TetheredCable": "0",
                        "Information": "  x 7-pin 'Smart' eg Mennekes (IEC 62196) - Fast (7kW, 32A)",
                        "Validated": "0"
                    },
                    {
                        "ConnectorId": "2",
                        "ConnectorType": "Type 2 Mennekes (IEC62196)",
                        "RatedOutputkW": "7.0",
                        "RatedOutputVoltage": "230",
                        "RatedOutputCurrent": "32",
                        "ChargeMethod": "Single Phase AC",
                        "ChargeMode": "3",
                        "ChargePointStatus": "In service",
                        "TetheredCable": "0",
                        "Information": "  x 7-pin 'Smart' eg Mennekes (IEC 62196) - Fast (7kW, 32A)",
                        "Validated": "0"
                    },
                ],
                "DeviceOwner": {
                    "OrganisationName": "Source London",
                    "SchemeCode": "SRC_LDN",
                    "Website": "https://www.sourcelondon.net",
                    "TelephoneNo": "020 3056 8989"
                },
                "DeviceController": {
                    "OrganisationName": "Source London",
                    "SchemeCode": "SRC_LDN",
                    "Website": "https://www.sourcelondon.net",
                    "TelephoneNo": "020 3056 8989"
                },
                "DeviceAccess": [],
                "DeviceNetworks": "Source London",
                "ChargeDeviceStatus": "In service",
                "PublishStatus": "Published",
                "DeviceValidated": "0",
                "RecordModerated": "Y",
                "RecordLastUpdated": "2015-09-02 11:28:16",
                "RecordLastUpdatedBy": "NCR Admin",
                "PaymentRequiredFlag": false,
                "PaymentDetails": "",
                "SubscriptionRequiredFlag": true,
                "SubscriptionDetails": "\u00a35 per annum for RFiD card",
                "ParkingFeesFlag": false,
                "ParkingFeesDetails": "",
                "ParkingFeesUrl": null,
                "AccessRestrictionFlag": false,
                "AccessRestrictionDetails": "",
                "PhysicalRestrictionFlag": false,
                "PhysicalRestrictionText": "",
                "OnStreetFlag": true,
                "LocationType": "On-street",
                "Bearing": null,
                "Accessible24Hours": false
            },
        ]
    };

    console.log(getUniqueConnectors(objectOne)); //["3-pin Type G (BS1363)", "Type 2 Mennekes (IEC62196)"]

暫無
暫無

聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.

相關問題 訪問 json 中的嵌套數組 訪問嵌套的json數組字段 訪問沒有命名元素的嵌套數組項 如何返回嵌套數組中的唯一項 使用 PHP 的 for-each 循環訪問嵌套對象數組 JSON 的所有項目 訪問嵌套在數組中的 JSON 對象 從 JSON 中的嵌套數組訪問值 訪問JSON中的嵌套數組對象和值 使用json和angularJs訪問范圍中的嵌套菜單項 嘗試訪問json數組中的嵌套項目
相關標簽
 
粵ICP備18138465號  © 2020-2024 STACKOOM.COM