如何使用Firebase和JavaScript解析此數據快照？

Question

我有這樣的數據結構

{ 
    "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" : "123@asd.com", 
     "given_name" : "23", 
     "last_name" : "123", 
     "password" : "1234567", 
     "timestamp" : 1495617328793 
    }, 
    "Nwacy3ADczgLC85OvSAgUNEGMkx2" : { 
     "designation" : "staff", 
     "email" : "adsasd@asdas.com", 
     "given_name" : "122123", 
     "last_name" : "12", 
     "password" : "asdasdsadasd", 
     "timestamp" : 1495681430048 
    } 
    } 
} 

我將需要的按鍵[pending, active, finished]與新加入的孩子的數據一起。這是我訪問火力地堡

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 
}); 

它打印此控制檯上：

我使用JSON.parse()，snapshot.child (path)，snapshot.field和snapshot[field]嘗試，但錯誤被拋出。我該怎麼做呢？

Answer 1

您的代碼獲取全部工作請求。因爲這些是由他們的狀態的層次，您的代碼將需要處理這個問題：

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()); 
    }); 
    }); 
});