文件上传进度条实现的核心就是对文件上传进度的监听,在前端通过ajax发送请求,可以对XMLHttpRequest.upload的onprogress事件进行监听,从loaded属性中获取已上传的文件大小,以此实时改变进度条的width属性,具体实现如下:
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Documenttitle>
<style>
body {
display: flex;
flex-direction: column;
justify-content: center;
align-items: flex-start;
}
.uploader {
display: flex;
align-items: center;
}
.slider-track {
width: 70vw;
height: 8px;
background-color: #080101;
margin: 20px 10px 20px 0;
border-radius: 4px;
}
.slider-bar {
height: 8px;
width: 0px;
border-radius: inherit;
background-image: linear-gradient(to right, #018eb2, #29c9eb);
transition: width;
}
style>
head>
<body>
<input type="file" onchange="uploadFile(this.files)">
<div class="uploader">
<div class="slider-track">
<div class="slider-bar">div>
div>
<div>
<span class="percentage">0span>%
div>
div>
<script>
function uploadFile(files) {
let fd = new FormData();
fd.append('file', files[0], "1.jpg")
let xhr = new XMLHttpRequest();
let sliderBar = document.querySelector(".slider-bar")
sliderBar.style.width = "0"
xhr.upload.addEventListener("progress", function (e) {
let percentage = e.loaded / e.total * 100
sliderBar.style.width = `${percentage}%`
document.querySelector(".percentage").innerHTML = `${percentage.toFixed(2)}`
})
xhr.open('post', 'http://localhost:80/upload')
xhr.send(fd)
}
script>
body>
html>
你可能需要了解的:
MDN-使用 XMLHttpRequest
MDN-XMLHttpRequest.upload