Javascript Can';是否由于子引用错误而无法删除数据?
我有一个用户结构,可以在其中创建和更新用户,但由于某种字符串导致的引用子错误,我无法删除用户 基本上,我有一个由不同用户ID组成的实时数据库,然后是姓名、年龄和国籍 我希望能够尝试通过用户ID(例如usr5)删除用户,以便在输入时将用户从数据库中删除 有人能帮忙吗 错误:Javascript Can';是否由于子引用错误而无法删除数据?,javascript,html,firebase,firebase-realtime-database,Javascript,Html,Firebase,Firebase Realtime Database,我有一个用户结构,可以在其中创建和更新用户,但由于某种字符串导致的引用子错误,我无法删除用户 基本上,我有一个由不同用户ID组成的实时数据库,然后是姓名、年龄和国籍 我希望能够尝试通过用户ID(例如usr5)删除用户,以便在输入时将用户从数据库中删除 有人能帮忙吗 错误: Reference.child failed: First argument was an invalid path = "[object HTMLInputElement]". Paths must be non-emp
Reference.child failed: First argument was an invalid path = "[object HTMLInputElement]". Paths must be non-empty strings and can't contain ".", "#", "$", "[", or "]"
at fi (validation.ts:382)
at o.child (Reference.ts:90)
at removeUser ((fie path folders) index.html:115:58)
我的HTML:
<body>
<div>
<h4>Create User: </h4>
<form>
<label>Create User ID: </label><input type="text" id="usrID"/><br/>
<label>First Name: </label><input type="text" id="usrFName"/><br/>
<label>Age: </label><input type="number" id="usrAge"/><br/>
<label>Nationality: </label>
<select id="usrNation">
<option value="American">American</option>
<option value="British">British</option>
<option value="French">French</option>
</select>
<button id="createUserBtn">Create</button>
</form>
</div>
<div>
<h4>Remove User: </h4>
<form>
<label>Create User ID: </label><input type="text" id="usrID"/><br/>
<button id="removeUserBtn">Remove</button>
</form>
</div>
<script>
var database = new Firebase("https://(my db url)/"),
userdb = database.child("/users");
userID = document.getElementById('usrID'),
userFirstName = document.getElementById('usrFName'),
userAge = document.getElementById('usrAge'),
userNationality = document.getElementById('usrNation');
function createUser(userID, usrFName, usrAge, usrNation){
firebase.database().ref('users/' + userID).set({
usrFName: usrFName,
usrAge: usrAge,
usrNation: usrNation
});
console.log('Success');
}
function insertAutoKey(usrFName, usrAge, usrNation){
var newPost = {
usrFName: usrFName,
usrAge: usrAge,
usrNation: usrNation
};
var newPostKey = firebase.database().ref().child('users').push().key;
var updates = {};
updates['/users/' + newPostKey] = newPost;
return firebase.database().ref().update(updates);
}
document.getElementById('createUserBtn').addEventListener('click', function(){
var usrID = userID.value,
usrFName = userFirstName.value,
usrAge = userAge.value,
usrNation = userNationality.value;
if(usrID && usrFName && usrAge && usrNation) {
createUser(usrID, usrFName, usrAge, usrNation);
}
});
function removeUser(){
var userRef = firebase.database().ref().child("users").child(userID);
userRef.once('value', function(snapshot) {
if (snapshot.val() === null) {
alert("no user found");
}else{
userRef.remove();
}
});
console.log('Remove Success');
}
document.getElementById('removeUserBtn').addEventListener('click', function(){
removeUser();
});
创建用户:
创建用户ID:
名字:
年龄:
国籍:
美国人
英国的
法语
创造
删除用户:
创建用户ID:
去除
我的Firebase/Javascript:
<body>
<div>
<h4>Create User: </h4>
<form>
<label>Create User ID: </label><input type="text" id="usrID"/><br/>
<label>First Name: </label><input type="text" id="usrFName"/><br/>
<label>Age: </label><input type="number" id="usrAge"/><br/>
<label>Nationality: </label>
<select id="usrNation">
<option value="American">American</option>
<option value="British">British</option>
<option value="French">French</option>
</select>
<button id="createUserBtn">Create</button>
</form>
</div>
<div>
<h4>Remove User: </h4>
<form>
<label>Create User ID: </label><input type="text" id="usrID"/><br/>
<button id="removeUserBtn">Remove</button>
</form>
</div>
<script>
var database = new Firebase("https://(my db url)/"),
userdb = database.child("/users");
userID = document.getElementById('usrID'),
userFirstName = document.getElementById('usrFName'),
userAge = document.getElementById('usrAge'),
userNationality = document.getElementById('usrNation');
function createUser(userID, usrFName, usrAge, usrNation){
firebase.database().ref('users/' + userID).set({
usrFName: usrFName,
usrAge: usrAge,
usrNation: usrNation
});
console.log('Success');
}
function insertAutoKey(usrFName, usrAge, usrNation){
var newPost = {
usrFName: usrFName,
usrAge: usrAge,
usrNation: usrNation
};
var newPostKey = firebase.database().ref().child('users').push().key;
var updates = {};
updates['/users/' + newPostKey] = newPost;
return firebase.database().ref().update(updates);
}
document.getElementById('createUserBtn').addEventListener('click', function(){
var usrID = userID.value,
usrFName = userFirstName.value,
usrAge = userAge.value,
usrNation = userNationality.value;
if(usrID && usrFName && usrAge && usrNation) {
createUser(usrID, usrFName, usrAge, usrNation);
}
});
function removeUser(){
var userRef = firebase.database().ref().child("users").child(userID);
userRef.once('value', function(snapshot) {
if (snapshot.val() === null) {
alert("no user found");
}else{
userRef.remove();
}
});
console.log('Remove Success');
}
document.getElementById('removeUserBtn').addEventListener('click', function(){
removeUser();
});
var database=newfirebase(“https://(my db url)/”,
userdb=database.child(“/users”);
userID=document.getElementById('usrID'),
userFirstName=document.getElementById('usrFName'),
userAge=document.getElementById('usrAge'),
usernational=document.getElementById('usrNation');
函数createUser(userID、usrFName、usrAge、usrNation){
firebase.database().ref('users/'+userID).set({
usrFName:usrFName,
usrAge:usrAge,
用法:用法
});
console.log('Success');
}
函数插入自动键(usrFName、usrAge、usrNation){
var newPost={
usrFName:usrFName,
usrAge:usrAge,
用法:用法
};
var newPostKey=firebase.database().ref().child('users').push().key;
var更新={};
更新['/users/'+newPostKey]=newPost;
返回firebase.database().ref().update(更新);
}
document.getElementById('createUserBtn')。addEventListener('click',function(){
var usrID=userID.value,
usrFName=userFirstName.value,
usrAge=userAge.value,
usrNation=usernational.value;
if(usrID&&usrFName&&usrAge&&usrNation){
createUser(usrID、usrFName、usrAge、usrNation);
}
});
函数removeUser(){
var userRef=firebase.database().ref().child(“用户”).child(用户ID);
userRef.once('value',函数(快照){
if(snapshot.val()==null){
警报(“未找到用户”);
}否则{
userRef.remove();
}
});
console.log('Remove Success');
}
document.getElementById('removeUserBtn')。addEventListener('click',function(){
removeUser();
});
更改此选项:
userID = document.getElementById('usrID'),
userFirstName = document.getElementById('usrFName'),
userAge = document.getElementById('usrAge'),
userNationality = document.getElementById('usrNation');
为此:
userID = document.getElementById('usrID').value;
userFirstName = document.getElementById('usrFName').value;
userAge = document.getElementById('usrAge').value;
userNationality = document.getElementById('usrNation').value;
您需要添加属性
value
来检索每个元素的值。仍在检索相同的错误,但我已经在createUserBtn的createUserBtndocument.getElementById('createUserBtn').addEventListener('click',function()中定义了value属性{var usrID=userID.value,usrFName=userFirstName.value,usrAge=userAge.value,usrNation=usernational.value;if(usrID&&usrFName&&usrAge&&usrNation){createUser(usrID,usrFName,usrAge,usrNation);})
userID
在这里是一个局部变量。如果createUser
正在工作,那么在添加value
之后,函数removeUser
也应该工作。因为现在根据错误,您在子()中得到了一个html元素
用于输入用户id问题似乎出在删除而不是创建区域?createUser工作正常,但在removeUser上不工作