javascript - 如果两个关联数组有一个字段值相同，则从它们中获取字段值

Question

我尝试过下面的 jquery 从另一个数组中获取数据，如果它们都有共同的 id

function fillVehicleDetails(vehicleDetailsArray,aggregationDriverArray, aggregationVehicleArray) {
    if (vehicleDetailsArray.length == 0){
        $("#vehicle-table").append("<tr><td>No Vehicle Added</td><td></td><td></td><td></td><td></td></tr>");
    }else{
        for (var counterOfLoop in vehicleDetailsArray){                    
            noOfVehicles++;
            var SearchVehicleId = vehicleDetailsArray[counterOfLoop]["VehicleId"]['$oid'];
            var VehicleNumber =  jQuery.grep(aggregationVehicleArray, function(a){
                return a['_id']['$oid'] == SearchVehicleId}).VehicleNumber;
            }
        }
    }

请注意，aggregationVehicleArray 包含类似的数据

array(2)
0 => 
VehicleNumber: "JK 123"
VehicleType: "Permanent"
_id: {$oid: "5b962874d2ccda10ac003702"}

1 => 
VehicleNumber: "JK 222"
VehicleType: "Permanent"
_id: {$oid: "5b962874d2ccda10ac003686"}

如果 SearchVehicleId 在循环内包含“5b962874d2ccda10ac003702”，那么它应该在 VehicleNumber 中获取“JK 123”。上面的代码返回“未定义”...请帮忙!!!

Answer 1

您返回了错误的值。试试这个返回a['_id']['$oid'] == SearchVehicleId})[0].VehicleNumber。由于 grep 存储回数组中，并且数组从索引 0 开始

var SearchVehicleId="5b962874d2ccda10ac003702";

var aggregationVehicleArray=[
    {
     "VehicleNumber": "JK 123",
     "VehicleType": "Permanent",
     "_id": {"$oid": "5b962874d2ccda10ac003702"}
     },{
     "VehicleNumber": "JK 222",
     "VehicleType": "Permanent",
     "_id": {"$oid": "5b962874d2ccda10ac003686"}
     }
     ];
     
    var VehicleNumber =  jQuery.grep(aggregationVehicleArray, function(a){
                                           return a['_id']['$oid'] == SearchVehicleId})[0].VehicleNumber;
     
    console.log(VehicleNumber);

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