进度条不起作用 文件正在上传 firebase
[英]progress bar is not working file is uploading firebase
问题描述
in this code i have added a file upload box and a progress bar to show the progress which is not working
在这段代码中，我添加了一个文件上传框和一个进度条来显示不工作的进度
the authentication are working perfectly身份验证工作正常
<html>
<head>
<title> firebase save</title>
<style media="screen">
body{
display : flex;
min-height: 100vh;
width : 100%;
padding : 0;
margin:0;
align-items: center;
justify-content: center;
flex-direction: column;
}
#uploader{
-webkit-appearance: none;
appearance: none;
width: 50%;
margin-bottom: 10px;
}
</style>
</head>
<body>
<progress value="0" max = "100" id="uploader" > 0%</progress>
<input type = "file" value="upload" id="fileButton" />
<script src="https://www.gstatic.com/firebasejs/4.9.0/firebase.js"></script>
<script>
// Initialize Firebase
var config = {
//initialization
};
firebase.initializeApp(config);
var uploader = document.getElementById('uploader');
var fileButton = document.getElementById('fileButton');
fileButton.addEventListener('change' , function(e) {
var file= e.target.files[0];
var storageRef = firebase.storage().ref('pics/' + file.name);
storageRef.put(file);
task.on('state_changed' ,
function progress(snapshot){
var percentage = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
uploader.value = percentage;
},
function error(err){
},
function complete(){
}
);
});
</script>
</body>
</html>
the file is uploaded successfully but the progress bar is not showing any indication
文件上传成功但进度条没有显示任何指示
the console throws a error called Uncaught ReferenceError: task is not definedat HTMLInputElement.控制台会抛出一个名为 Uncaught ReferenceError: task is not definedat HTMLInputElement 的错误。
1 个解决方案
解决方案1
3 已采纳 2020-02-03 13:34:00
You never define what is the task variable in your code, hence the error.您永远不会在代码中定义task变量是什么，因此会出现错误。
You should do as follows:你应该这样做：
var file= e.target.files[0];
var storageRef = firebase.storage().ref('pics/' + file.name);
var task = storageRef.put(file); // <--- See the difference here
task.on('state_changed' ,
function progress(snapshot){
var percentage = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
uploader.value = percentage;
},
function error(err){
},
function complete(){
}
Doc and Reference: https://firebase.google.com/docs/storage/web/upload-files#monitor_upload_progress and https://firebase.google.com/docs/reference/js/firebase.storage.UploadTask文档和参考： https : //firebase.google.com/docs/storage/web/upload-files#monitor_upload_progress和https://firebase.google.com/docs/reference/js/firebase.storage.UploadTask
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