Question

如何将locationId数组传递给服务？

我有一组位置ID

locationArr=[40871, 60009, 38149, 40868, 43240, 15299, 53897, 40976, 38151, 23183, 38152, 78579, 23180, 40977, 23176, 39565, 40884, 15298, 38147, 40966, 39669]

实际上我需要将locationArr传递给http://192.168.7.45:9200/location/_doc/+locationArr

我需要传递locationArr上存在的locationId数组以进行服务，以获取数组locationArr上每个locationId的GPS1纬度和经度。

服务仅通过一个locationId通过locationId获取位置，但是对于位置数组，这是我的问题

getLocationData(id: number) {  
console.log("server "+id)  
return this.http.get('http://192.168.7.45:9200/location/_doc/'+id);  
}

所以请如何在位置数组中循环实现

calling service
this.partDetailsService.getLocationData(this.LocationId).subscribe(res => {          
         this.dataLocation = res['_source']['GPS1'];     
         var loc = this.dataLocation.split(',');      
         this.lat = loc[0].trim();    
         this.lng = loc[1].trim();

Answer 1

首先，您需要更改后端以接受多个locationId，似乎它仅接受一个，然后基于此您可以发送数据。

如果您的后端将在GET中支持多个Id作为逗号分隔的值，那么您的角度代码将如下所示

getLocationData(ids: Array<number>) {  
   console.log("server "+ids)  
   return this.http.get('http://192.168.7.45:9200/location/_doc/'+ids.join(','));  
}

如果您的后端将多个Id作为POST正文数组支持，那么您的角度代码将如下所示

getLocationData(ids: Array<number>) {  
   console.log("server "+ids)  
   return this.http.post('http://192.168.7.45:9200/location/_doc/', { ids: ids });  
}

如果您的后端不支持多个ID，那么您需要遍历ID并为每个ID调用后端

getLocationData(ids: Array<number>) {  
    let observableBatch = [];

    this.ids.forEach((id) => {

        observableBatch.push(
              this.http.get('http://192.168.7.45:9200/location/_doc/'+id)
                       .map((res) => res.json()));
    });

    return Observable.forkJoin(observableBatch);
}


this.partDetailsService.getLocationData(this.LocationIds).subscribe(res : Array<any> => {  
         since it's an array you needs to loop through res        
         res.forEach((item, index) => {
            const dataLocation = res[index]['_source']['GPS1'];     
            const loc = this.dataLocation.split(',');      
            this.lat[index] = loc[0].trim();    
            this.lng[index] = loc[1].trim();
         });
}

总而言之，后端api签名驱动了如何调用它

如何将locationId数组传递给服务getLocationData？

1 个答案: