的JavaScript。我想在dropzone的帮助下上传图片或文件。当文件上传时，应该显示一个时间文件..
<html>
<head>
<meta charset="utf-8">
<title>variables</title>
<style>
#drop_zone {
background-color: #EEE;
border: #999 5px dashed;
width: 290px;
height: 200px;
padding: 8px;
font-size: 18px;
}
</style>
<script>
function drag_drop(event) {
event.preventDefault();
alert(event.dataTransfer.files[0]);
alert(event.dataTransfer.files[0].name);
alert(event.dataTransfer.files[0].size+" bytes");
/* This is where to begin uploading the file with Ajax and upload progress bar to PHP script */
/* https://www.developphp.com/video/JavaScript/File-Upload-Progress-Bar-Meter-Tutorial-Ajax-PHP */
}
function _(el){
return document.getElementById(el);
}
function uploadFile(){
var file = _("file1").files[0];
// alert(file.name+" | "+file.size+" | "+file.type);
var formdata = new FormData();
formdata.append("file1", file);
var ajax = new XMLHttpRequest();
ajax.upload.addEventListener("progress", progressHandler, false);
ajax.addEventListener("load", completeHandler, false);
ajax.addEventListener("error", errorHandler, false);
ajax.addEventListener("abort", abortHandler, false);
ajax.open("POST", "file_upload_parser.php");
ajax.send(formdata);
}
function progressHandler(event){
_("loaded_n_total").innerHTML = "Uploaded "+event.loaded+" bytes of "+event.total;
var percent = (event.loaded / event.total) * 100;
_("progressBar").value = Math.round(percent);
_("status").innerHTML = Math.round(percent)+"% uploaded... please wait";
}
function completeHandler(event){
_("status").innerHTML = event.target.responseText;
_("progressBar").value = 0;
}
function errorHandler(event){
_("status").innerHTML = "Upload Failed";
}
function abortHandler(event){
_("status").innerHTML = "Upload Aborted";
}
</script>
</head>
<body>
<h1>File Upload Drop Zone</h1>
<div id="drop_zone" ondrop="drag_drop(event)" ondragover="return false"></div>
<form id="upload_form" enctype="multipart/form-data" method="post">
<input type="file" name="file1" id="file1"><br>
<input type="button" value="Upload File" onclick="uploadFile()">
<progress id="progressBar" value="0" max="100" style="width:300px;"></progress>
<h3 id="status"></h3>
<p id="loaded_n_total"></p>
</form>
</body>
你能告诉我哪里错了，问题是什么...... 我们可以在ajax的帮助下使用上传文件，如果是的话请发给我代码我们将如何上传文件和图片