我正在尝试使用HTML表格中的Javascript从Firebase存储中获取一些图片,但我一直收到此错误:
storage.refFromURL is not a function
考虑到来自here
的信息,这很奇怪//从Google云端存储URI创建引用 var gsReference = storage.refFromURL('gs://bucket/images/stars.jpg')
javascript代码也从Firebase数据库获取数据,并且数据库中的每个子项都包含一个URL(在数据库中定义为imageUrl
)到 gs:/形式的Firebase存储/ xxxxxxx ,我想在表格中使用它。换句话说,我想从数据库中获取文本,从存储中获取图像,但我不断收到“非函数”错误。我有以下代码:
index.js
var rootRef = firebase.database().ref().child("Test");
var storage = firebase.storage().ref();
rootRef.on("child_added", snap => {
var headline = snap.child("headline").val();
var url_ul = snap.child("imageUrl").val();
var storageRef = storage.refFromURL('url_ul').getDownloadURL().then(function(url) {
var test = url;
alert(url);
document.querySelector('img').src = test;
}).catch(function(error) {});
$("#table_body").append("</td><td>" + headline + "</td><td><img src='test' alt='' border=3 height=100 width=100></td>");
});
包含Firebase信息的HTML文件:
<!DOCTYPE html>
<html>
<head>
<title>Firebase Web Basics</title>
<link href="https://fonts.googleapis.com/css?family=Raleway:300,400,500,700" rel="stylesheet">
<script src="https://use.fontawesome.com/939e9dd52c.js"></script>
</head>
<body>
<div class="mainDiv" align="left">
<h1>All users</h1>
<table>
<thead>
<tr>
<td>Headline</td>
<td>Image</td>
</tr>
</thead>
<tbody id="table_body">
</tbody>
</table>
</div>
<script src="https://www.gstatic.com/firebasejs/4.9.1/firebase.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: "AIxxxxxxxxxxxxxxxxxxxxxxxxxxx",
authDomain: "xxxxxxxxxxxx.firebaseapp.com",
databaseURL: "https://xxxxxxxxxxxxx.firebaseio.com",
projectId: "xxxxxxxxxxxxxxxx",
storageBucket: "xxxxxxxxxxxxx.appspot.com",
messagingSenderId: "0000000000000000"
};
firebase.initializeApp(config);
</script>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<script src="index.js"></script>
<script src="https://www.gstatic.com/firebasejs/4.12.0/firebase-database.js"></script>
</body>
</html>
答案 0 :(得分:2)
你基本上这样做:
var storage = firebase.storage().ref();
它为您提供Reference
。
然后你打电话:
storage.refFromURL('url_ul')
但是refFromURL
is only defined on the root Storage
object。
所以你想要:
var storage = firebase.storage();
storage.refFromURL('url_ul')