| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>上传文件</title>
<script type="text/javascript">
function sub() {
var obj = new XMLHttpRequest();
obj.onreadystatechange = function() {
if (obj.status == 200 && obj.readyState == 4) {
document.getElementById('con').innerHTML = obj.responseText;
}
}
// 通过Ajax对象的upload属性的onprogress事件感知当前文件上传状态
obj.upload.onprogress = function(evt) {
// 上传附件大小的百分比
var per = Math.floor((evt.loaded / evt.total) * 100) + "%";
// 当上传文件时显示进度条
document.getElementById('parent').style.display = 'block';
// 通过上传百分比设置进度条样式的宽度
document.getElementById('son').style.width = per;
// 在进度条上显示上传的进度值
document.getElementById('son').innerHTML = per;
}
// 通过FormData收集零散的文件上传信息
var fm = document.getElementById('userfile3').files[0];
var fd = new FormData();
fd.append('userfile', fm);
obj.open("post", "upload.php");
obj.send(fd);
}
</script>
<style type="text/css">
#parent {
width: 200px;
height: 20px;
border: 2px solid gray;
background: lightgray;
display: none;
}
#son {
width: 0;
height: 100%;
background: lightgreen;
text-align: center;
}
</style>
</head>
<body>
<h2>Ajax实现进度条文件上传</h2>
<div id="parent">
<div id="son"></div>
</div>
<p id="con"></p>
<input type="file" name="userfile" id="userfile3"><br><br>
<input type="button" name="btn" value="文件上传" onclick="sub()">
</body>
</html>
|
