如何使用Firebase和JavaScript解析此数据快照？

Question

我有这样的数据结构

{ 
    "job-requests" : { 
    "pending" : { 
     "-KkyZGfqmiIVryyLAZpD" : { 
     "job_details" : "asd", 
     "job_type" : "Repair Required", 
     "location" : "123", 
     "location_lat" : 14.106128, 
     "location_lng" : 121.24110514763743, 
     "timestamp" : 1495698316411 
     } 
    } 
    }, 
    "office-info" : { 
    "123" : { 
     "office_acronym" : "123", 
     "office_contact_number" : "123-1234", 
     "office_current_head" : "None", 
     "office_name" : "123", 
     "office_parent_unit" : "123" 
    } 
    }, 
    "office-location-list" : { 
    "123" : { 
     "location_lat" : 14.106128, 
     "location_lng" : 121.24110514763743 
    } 
    }, 
    "users" : { 
    "MBR5o37xafUyuLw14Xqa1ku0Zui1" : { 
     "designation" : "staff", 
     "email" : "[email protected]", 
     "given_name" : "23", 
     "last_name" : "123", 
     "password" : "1234567", 
     "timestamp" : 1495617328793 
    }, 
    "Nwacy3ADczgLC85OvSAgUNEGMkx2" : { 
     "designation" : "staff", 
     "email" : "[email protected]", 
     "given_name" : "122123", 
     "last_name" : "12", 
     "password" : "asdasdsadasd", 
     "timestamp" : 1495681430048 
    } 
    } 
} 

我将需要的按键[pending, active, finished]与新加入的孩子的数据一起。这是我访问火力地堡

firebase.database().ref ('job-requests').on ('child_added', (snapshot) => { 
    console.log (snapshot.key); // prints out [pending, active, finished] 
    console.log (snapshot.val()); // prints out an object 
}); 

它打印此控制台上：

我使用JSON.parse()，snapshot.child (path)，snapshot.field和snapshot[field]尝试，但错误被抛出。我该怎么做呢？

Answer 1

您的代码获取全部工作请求。因为这些是由他们的状态的层次，您的代码将需要处理这个问题：

firebase.database().ref ('job-requests').on ('child_added', (snapshot) => { 
    snapshot.forEach((stateSnapshot) => { 
    console.log(stateSnapshot.key); // 'pending', etc 
    stateSnapshot.forEach((jobSnapshot) => { 
     console.log(jobSnapshot.key); 
     console.log(jobSnapshot.val()); 
    }); 
    }); 
});