How to implement PHP+Ajax to dynamically display the progress of uploading files-PHP Tutorial-php.cn

How to implement PHP+Ajax to dynamically display the progress of uploading files

藏色散人

Release： 2023-04-07 22:18:01

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How to implement PHP+Ajax to dynamically display the progress of uploading files

Let me make a premise:

The PHP configuration file stipulates that the default upload file size limit is less than 2M. If you need to upload large files, you need to change the upload_max_filesize and upload_max_filesize in php.ini at the same time. The values of max_execution_time and post_max_size.

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Main interface and Ajax implementation:

index.html

<!DOCTYPE html>
<html>
<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(&#39;con&#39;).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(&#39;parent&#39;).style.display = &#39;block&#39;;
// 通过上传百分比设置进度条样式的宽度
document.getElementById(&#39;son&#39;).style.width = per;
// 在进度条上显示上传的进度值
document.getElementById(&#39;son&#39;).innerHTML = per;
}
 
// 通过FormData收集零散的文件上传信息
var fm = document.getElementById(&#39;userfile3&#39;).files[0];
var fd = new FormData();
fd.append(&#39;userfile&#39;, 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" οnclick="sub()">
</body>
</html>

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php handles uploads File: upload.php

<?php 
// 上传文件进行简单错误过滤
if ($_FILES[&#39;userfile&#39;][&#39;error&#39;] > 0) {
exit("上传文件有错".$_FILES[&#39;userfile&#39;][&#39;error&#39;]);
}
 
// 定义存放上传文件的真实路径
$path = &#39;./upload/&#39;;
// 定义存放上传文件的真实路径名字
$name = $_FILES[&#39;userfile&#39;][&#39;name&#39;];
 
// 将文件的名字的字符编码从UTF-8转成GB2312
$name = iconv("UTF-8", "GB2312", $name);
 
// 将上传文件移动到指定目录文件中
if (move_uploaded_file($_FILES[&#39;userfile&#39;][&#39;tmp_name&#39;], $path.$name)) {
echo "文件上传成功";
} else {
echo "文件上传失败";
}
 ?>

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