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html5指南-3.如何实现html元素拖拽功能

作者：用户投稿来源：网络发布时间： 13/07/26

rtical-align: middle;
}
</style>
</head>
<body>
<form id="fruitform" method="post" action="/UploadHandler.ashx">
<div class="table">
<div class="row">
<div class="cell label">
Bananas:</div>
<div class="cell">
<input name="bananas" value="2" /></div>
</div>
<div class="row">
<div class="cell label">
Apples:</div>
<div class="cell">
<input name="apples" value="5" /></div>
</div>
<div class="row">
<div class="cell label">
Cherries:</div>
<div class="cell">
<input name="cherries" value="20" /></div>
</div>
<div class="row">
<div class="cell label">
File:</div>
<div class="cell">
<input type="file" name="file" /></div>
</div>
<div class="row">
<div class="cell label">
Total:</div>
<div id="results" class="cell">
items</div>
</div>
</div>
<div id="target">
<p id="msg">
Drop Files Here</p>
</div>
<button id="submit" type="submit">
Submit Form</button>
</form>
<script type="text/javascript">
var target = document.getElementById("target");
var httpRequest;
var fileList;
target.ondragenter = handleDrag;
target.ondragover = handleDrag;
function handleDrag(e) {
e.preventDefault();
}
target.ondrop = function (e) {
fileList = e.dataTransfer.files;
e.preventDefault();
}
document.getElementById("submit").onclick = function handleButtonPress(e) {
e.preventDefault();
var form = document.getElementById("fruitform");
var formData = new FormData(form);
if (fileList) {
for (var i = 0; i < fileList.length; i++) {
formData.append("file" + i, fileList[i]);
}
}
httpRequest = new XMLHttpRequest();
httpRequest.onreadystatechange = handleResponse;
httpRequest.open("POST", form.action);
httpRequest.send(formData);
}
function handleResponse() {
if (httpRequest.readyState == 4 && httpRequest.status == 200) {
var data = JSON.parse(httpRequest.responseText);
document.getElementById("results").innerHTML = "You ordered " + data.total + " items";
}
}
</script>
</body>
</html>

效果：