javascript - firebase - Reference.set 失败 : First argument contains undefined in property 'users.undefined.profileImageUrl'

Question

我是 firebase 和 Javascript 的新手，我尝试了很多方法来通过 user.uid 获取用户数据存储，但我得到的只是数据存储在“未定义”下”。

var displayName;
var userInfo;
var profile_url;

   $("#login-btn").click(function(){
     userInfo = firebase.auth().currentUser;
     if (userInfo) { 
       firebase.auth().signOut(); 
     } else { 
       var email = document.getElementById('login_email').value; 
       var password = document.getElementById('login_pw').value; 

       firebase.auth().signInWithEmailAndPassword(email, password).then(function(){
         document.getElementById('login_bar').style.display = "none";
         document.getElementById('logout_bar').style.display = "inline-block"; 
         document.getElementById('userinfo_bar').style.display = "inline-block"; 
         document.getElementById('secession_bar').style.display = "inline-block";
         alert("login success");
         location.replace('board.html');
       }).catch(function(error) {

         var errorCode = error.code;
         var errorMessage = error.message;

         if (errorCode === 'auth/wrong-password') {
           alert('wrong-password.');
         }

         else {
           alert(errorMessage);
         }
         console.log(errorMessage);

       }); 


     } 

   });

   $("#join-btn").click(function(){ 
     var email = document.getElementById('join_email').value;
     var password = document.getElementById('join_pw').value;
     var displayName = document.getElementById('join_name').value;
     var job = $('input[name=job]:checked').val();

    firebase.auth().createUserWithEmailAndPassword(email, password).then(function(user) {

      var u_Ref = firebase.database().ref('users/' + user.uid);

      userInfo = user;

      u_Ref.set({
        'email' : email,
        'job': job,
        'profileImageUrl':profile_url,
        'uid' : user.uid,
        'username': displayName
      });


        handleFileSelect(); 
        alert("join success");

    }, function(error) {
  var errorCode = error.code;
  var errorMessage = error.message;
  alert(error);
});

     if (email.length < 4) {
       alert('x');
       return;
     }
     if (password.length < 4) {
       alert('x');
       return;
     }

    function initApp() {
      firebase.auth().onAuthStateChanged(function(user) {
        if (user) { 
          var displayName = user.displayName;
          var email = user.email;
          var emailVerified = user.emailVerified;
          var photoURL = user.photoURL;
          var isAnonymous = user.isAnonymous;
          var uid = user.uid;
          var providerData = user.providerData;

          user.updateProfile ({
            displayName : displayName,

          }). then (function () {
            console.log ( 'success');
          }). catch (function (error) {
            console.log( 'no');
          });

          userInfo = user;

          firebase.auth().setPersistence(firebase.auth.Auth.Persistence.SESSION); 
          document.getElementById('login_bar').style.display = "none";
          document.getElementById('logout_bar').style.display = "inline-block"; 
          document.getElementById('userinfo_bar').style.display = "inline-block";
          document.getElementById('secession_bar').style.display = "inline-block";


          $("#secession_bar").click(function(){
            user.delete().then(function(){ 
              alert('success');
             userRef= firebase.database().ref('users/' + user.uid);
             userRef.remove(); 
             firebase.storage().ref().child('userImages/' + userInfo.uid).delete(); 
            location.reload();
            });
          });

          $("#logout_bar").click(function(){
            firebase.auth().signOut();
            location.reload();
          });



        } else { 

          document.getElementById('login_bar').style.display = "inline-block"; 
          document.getElementById('logout_bar').style.display = "none"; 
          document.getElementById('userinfo_bar').style.display = "none";
          document.getElementById('secession_bar').style.display = "none";



        } 

      });
    } 

    function handleFileSelect(evt) {
      evt.stopPropagation();
      evt.preventDefault();
      var file = evt.target.files[0];

      var metadata = {
        'contentType': file.type
      };


      var storageRef = firebase.storage().ref().child('userImages/' +userInfo.uid);

      storageRef.put(file, metadata).then(function(snapshot) {
        console.log('Uploaded', snapshot.totalBytes, 'bytes.');
        console.log('File metadata:', snapshot.metadata);

        snapshot.ref.getDownloadURL().then(function(url) {
          console.log('File available at', url);
          profile_url = url;

        });
      }).catch(function(error) {

        console.error('Upload failed:', error);

      });

    } 

Answer 1

我在你的代码中发现了一个东西，createUserWithEmailAndPassword方法返回一个类型为UserCredential的 promise ，一个包含凭据和用户结构的对象，因此您在询问属性uid时犯了一个错误 user(返回的 promise )不存在。

它应该看起来像这样:

firebase.auth().createUserWithEmailAndPassword(email, password).then(function(credential) {

      var userInfo = creadential.user;

      var u_Ref = firebase.database().ref('users/' + userInfo.uid);

      u_Ref.set({
        'email' : email,
        'job': job,
        'profileImageUrl':profile_url,
        'uid' : userIfo.uid,
        'username': displayName
      });