HTML5 实现文件拖放上传

浏览数：24 / 时间：2015年06月09日

1. [图片] 5375acf5gw1dusqsscfksj.jpg

?2. [代码][HTML]代码

<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="utf-8" />
<title>OSCTools JsBin在线演示-HTML5 Drag & Drop 多文件上传 from Script Tutorials</title>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<style>
.container {
overflow:hidden;
width:960px;
margin:20px auto;
}
.contr {
background-color: #212121;
color: #FFFFFF;
padding: 10px 0;
text-align: center;

border-radius:10px 10px 0 0;
-moz-border-radius:10px 10px 0 0;
-webkit-border-radius:10px 10px 0 0;
}
.upload_form_cont {
background: -moz-linear-gradient(#ffffff, #f2f2f2);
background: -ms-linear-gradient(#ffffff, #f2f2f2);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ffffff), color-stop(100%, #f2f2f2));
background: -webkit-linear-gradient(#ffffff, #f2f2f2);
background: -o-linear-gradient(#ffffff, #f2f2f2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=‘#ffffff‘, endColorstr=‘#f2f2f2‘);
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=‘#ffffff‘, endColorstr=‘#f2f2f2‘)";
background: linear-gradient(#ffffff, #f2f2f2);

color: #000;
overflow: hidden;
}
.info {
background-color: #EEEEEE;
border: 1px solid #DDDDDD;
float: left;
font-weight: bold;
height: 530px;
margin: 20px;
position: relative;
width: 560px;
}
.info > div {
font-size: 14px;
font-weight: bold;
padding: 10px 15px 5px;
}
.info > h2 {
padding: 0 15px;
}
.info > canvas {
margin-left: 15px;
margin-bottom: 10px;
}
.info #url {
width: 400px;
}
#dropArea {
background-color: #DDDDDD;
border: 3px dashed #000000;
float: left;
font-size: 48px;
font-weight: bold;
height: 530px;
line-height: 530px;
margin: 20px;
position: relative;
text-align: center;
width: 300px;
}
#dropArea.hover {
background-color: #CCCCCC;
}
#dropArea.uploading {
background: #EEEEEE url(loading.gif) center 30% no-repeat;
}
#result .s, #result .f {
font-size: 12px;
margin-bottom: 10px;
padding: 10px;

border-radius:10px;
-moz-border-radius:10px;
-webkit-border-radius:10px;
}
#result .s {
background-color: #77fc9f;
}
#result .f {
background-color: #fcc577;
}

</style>
</head>
<body>
<div class="container">
<div class="contr"><h2><a href=‘http://www.osctools.net/‘ target=‘_blank‘ style=‘color:white;‘>osctools</a>: 将你的图片拖拽到“Drop区域”(一次最多上传五个, 文件大小小于256kb)</h2></div>
<div class="upload_form_cont">
<div id="dropArea">文件拖到这里</div>
<div class="info">
<div>上传文件剩余: <span id="count">0</span></div>
<div>上传目录: <input id="url" value="http://www.script-tutorials.com/demos/257/upload.php"/></div>
<h2>结果:</h2>
<div id="result"></div>
<canvas width="500" height="20"></canvas>
</div>
</div>
</div>
</body>
</html>
3. [代码][JavaScript]代码
// variables
var dropArea = document.getElementById(‘dropArea‘);
var canvas = document.querySelector(‘canvas‘);
var context = canvas.getContext(‘2d‘);
var count = document.getElementById(‘count‘);
var destinationUrl = document.getElementById(‘url‘);
var result = document.getElementById(‘result‘);
var list = [];
var totalSize = 0;
var totalProgress = 0;

// main initialization
(function(){

// init handlers
function initHandlers() {
dropArea.addEventListener(‘drop‘, handleDrop, false);
dropArea.addEventListener(‘dragover‘, handleDragOver, false);
}

// draw progress
function drawProgress(progress) {
context.clearRect(0, 0, canvas.width, canvas.height); // clear context

context.beginPath();
context.strokeStyle = ‘#4B9500‘;
context.fillStyle = ‘#4B9500‘;
context.fillRect(0, 0, progress * 500, 20);
context.closePath();

// draw progress (as text)
context.font = ‘16px Verdana‘;
context.fillStyle = ‘#000‘;
context.fillText(‘上传进度: ‘ + Math.floor(progress*100) + ‘%‘, 50, 15);
}http://www.huiyi8.com/huawen/?

// drag over花纹
function handleDragOver(event) {
event.stopPropagation();
event.preventDefault();

dropArea.className = ‘hover‘;
}

// drag drop
function handleDrop(event) {
event.stopPropagation();
event.preventDefault();

processFiles(event.dataTransfer.files);
}

// process bunch of files
function processFiles(filelist) {
if (!filelist || !filelist.length || list.length) return;

totalSize = 0;
totalProgress = 0;
result.textContent = ‘‘;

for (var i = 0; i < filelist.length && i < 5; i++) {
list.push(filelist[i]);
totalSize += filelist[i].size;
}
uploadNext();
}

// on complete - start next file
function handleComplete(size) {
totalProgress += size;
drawProgress(totalProgress / totalSize);
uploadNext();
}

// update progress
function handleProgress(event) {
var progress = totalProgress + event.loaded;
drawProgress(progress / totalSize);
}

// upload file
function uploadFile(file, status) {

// prepare XMLHttpRequest
var xhr = new XMLHttpRequest();
xhr.open(‘POST‘, destinationUrl.value);
xhr.onload = function() {
result.innerHTML += this.responseText;
handleComplete(file.size);
};
xhr.onerror = function() {
result.textContent = this.responseText;
handleComplete(file.size);
};
xhr.upload.onprogress = function(event) {
handleProgress(event);
}
xhr.upload.onloadstart = function(event) {
}

// prepare FormData
var formData = new FormData();
formData.append(‘myfile‘, file);
xhr.send(formData);
}

// upload next file
function uploadNext() {
if (list.length) {
count.textContent = list.length - 1;
dropArea.className = ‘uploading‘;

var nextFile = list.shift();
if (nextFile.size >= 262144) { // 256kb
result.innerHTML += ‘<div class="f">文件过大 (max filesize exceeded)</div>‘;
handleComplete(nextFile.size);
} else {
uploadFile(nextFile, status);
}
} else {
dropArea.className = ‘‘;
}
}

initHandlers();
})();

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HTML5 实现文件拖放上传