javascript - 根据 emailId 匹配从 Firebase 数据库获取节点名称

Question

我有下面的 Json 架构，我可以使用什么 firebase 查询来获取节点名称(0153,0154)，我可以使用一次方法获取名称(joel，vikram，sachin)

 "EmployeeInfo":
        {
        "0153":
        {
          "Name":"Joel",
          "Dept":"Engineering",
          "Email":"joel@dept.com"
        },
        "0163":
        {
          "Name":"Vikram",
          "Dept":"Engineering",
          "Email":"vikram@dept.com"
        },
         "0173":
        {
          "Name":"Sachin",
          "Dept":"Engineering",
          "Email":"Sachin@dept.com"
        }

这是我的 JavaScript 函数:

function Call() {

  var dbref = new Firebase("https://logintrialapp.firebaseio.com/Employee/EmployeeInfo");
  var login = localStorage.getItem("Email");
  dbref
    .once("value")
    .then(function(snapshot) {
        snapshot.forEach(function(childSnapshot) {
            childData = childSnapshot.val();
            name = childData.Name;
            var n = login.localeCompare(name);
            console.log(name);

            if (n != 0) {
                var eid = snapshot.val();
                console.log("Hello" + eid);
            }
            console.log(snapshot.val());
        })
    })

使用此代码，我可以获取名称，但我想检索节点名称，可以使用什么查询来根据 emailid 匹配条件获取节点名称

输出:

Joel
 Checkworks.html:50 Hello[object Object]
    Checkworks.html:55 Object {0153: Object, 0163: Object, 0173: Object}0153: ObjectDept: "Engineering"Email: "joel@dept.com"Name: "Joel"__proto__: Object0163: Object0173: 
    Object__proto__: Object
    Checkworks.html:44 Vikram
    Checkworks.html:50 Hello[object Object]
    Checkworks.html:55 Object0153: ObjectDept: "Engineering"
    Email: "joel@dept.com"Name: "Joel"__proto__: Object0163
    : Object0173: ObjectDept: "Engineering"Email: "Sachin@dept.com"Name: "Sachin"__proto__: Object__proto__: Object
    Checkworks.html:44 Sachin
    Checkworks.html:50 Hello[object Object]
    Checkworks.html:55 Object {0153: Object, 0163: Object, 0173: Object}

Answer 1

要获取 childSnapshot 的 key ，请调用 childSnapshot.key:

.then(function(snapshot) {
    snapshot.forEach(function(childSnapshot) {
        childKey = childSnapshot.key; // Get the key of the child
        childData = childSnapshot.val();
        name = childData.Name;
        var n = login.localeCompare(name);
        console.log(name);

        if (n != 0) {
            var eid = snapshot.val();
            console.log("Hello" + eid);
        }
        console.log(snapshot.val());
    })
})