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PHP implements uploading files without page refresh

巴扎黑Original: 2016-11-21 13:56:351159browse

Front html page:

<html>
<head>
<title>无刷新上传文件</title>
<meta Content-type="text/html" charset="utf-8" />
<script type="text/javascript">
function startUpload() {
document.getElementById(&#39;processing&#39;).innerHTML = &#39;loding...&#39;;
return true;
}
function stopUpload(rel){
var msg = "";
switch (rel) {
case 0:
msg = "上传成功";
break;
case 1:
msg = "上传的文件超过限制";
break;
case 2:
msg = "只能上传图片文件";
break;
default:
msg = "上传文件失败";
}
document.getElementById(&#39;processing&#39;).innerHTML = msg;
}
</script>
</head>
<body>
<div style="text-align:center">
<div id="processing"></div>
<form action="upload.php" method="post" enctype="multipart/form-data" 
target="form-target" onsubmit="startUpload();">
<input type="hidden" name="MAX_FILE_SIZE" value="1000000" />
<input type="file" name="myfile" />
<input type="submit" name="sub" value="上传" />
</form>
<iframe style="width:0; height:0; border:0;" name="form-target"></iframe>
</div>
</body>
</html>

Backend php code: upload.php:

<?php
sleep(2);
$fileTypes = array(&#39;jpg&#39;,&#39;png&#39;,&#39;gif&#39;,&#39;bmp&#39;);
$result = null;
$uploadDir = &#39;./upload&#39;;
$maxSize = 1 * pow(2,20);
if ($_SERVER[&#39;REQUEST_METHOD&#39;] == &#39;POST&#39; && isset($_POST[&#39;sub&#39;])) {
$myfile = $_FILES[&#39;myfile&#39;];
$myfileType = substr($myfile[&#39;name&#39;], strrpos($myfile[&#39;name&#39;], ".") + 1);
if ($myfile[&#39;size&#39;] > $maxSize) {
$result = 1;
} else if (!in_array($myfileType, $fileTypes)) {
$result = 2;
} elseif (is_uploaded_file($myfile[&#39;tmp_name&#39;])) {
$toFile = $uploadDir . &#39;/&#39; . $myfile[&#39;name&#39;];
if (@move_uploaded_file($myfile[&#39;tmp_name&#39;], $toFile)) {
$result = 0;
} else {
$result = -1;
}
} else {
$result = 1;
}
}
?>
<script type="text/javascript">
window.top.window.stopUpload(<?php echo $result; ?>);
</script>

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