通过使用以下代码,我上传了一张图片并在上传时生成了进度条。现在我需要从上传的图片中裁剪特定部分,并且必须在单独的div中显示裁剪的部分。参考链接:Html file upload
HTML:
<body>
<div>
<h2 class="">Upload a Profile Image</h2>
<div class="control-group">
<form id="upload" action="upload.php" method="POST" enctype="multipart/form-data">
<fieldset>
<input type="hidden" id="MAX_FILE_SIZE" name="MAX_FILE_SIZE" value="300000" />
<div>
<div id="filedrag"><img src="images/profile_imgholder.png" alt=""/><br/>
Drop a photo to upload here<br/>
or</div>
<input type="file" id="fileselect" name="fileselect[]" multiple/>
</div>
<div id="submitbutton">
<button type="submit">Upload Files</button>
</div>
</fieldset>
</form>
<div id="progress"> </div>
<div id="messages"> </div>
</div>
<script src="js/jquery.min.js"></script>
<script src="js/filedrag.js"></script>
</body>
jquery的
/*
filedrag.js - HTML5 File Drag & Drop demonstration
Featured on SitePoint.com
Developed by Craig Buckler (@craigbuckler) of OptimalWorks.net
*/
(function() {
// getElementById
function $id(id) {
return document.getElementById(id);
}
// output information
function Output(msg) {
var m = $id("messages");
m.innerHTML = msg + m.innerHTML;
}
// file drag hover
function FileDragHover(e) {
e.stopPropagation();
e.preventDefault();
e.target.className = (e.type == "dragover" ? "hover" : "");
}
// file selection
function FileSelectHandler(e) {
// cancel event and hover styling
FileDragHover(e);
// fetch FileList object
var files = e.target.files || e.dataTransfer.files;
// process all File objects
for (var i = 0, f; f = files[i]; i++) {
ParseFile(f);
UploadFile(f);
}
}
// output file information
function ParseFile(file) {
// display an image
if (file.type.indexOf("image") == 0) {
var reader = new FileReader();
reader.onload = function(e) {
Output(
'<img src="' + e.target.result + '" />'
);
}
reader.readAsDataURL(file);
}
// display text
if (file.type.indexOf("text") == 0) {
var reader = new FileReader();
reader.onload = function(e) {
Output(
"<p><strong>" + file.name + ":</strong></p><pre>" +
e.target.result.replace(/</g, "<").replace(/>/g, ">") +
"</pre>"
);
}
reader.readAsText(file);
}
}
// upload JPEG files
function UploadFile(file) {
// following line is not necessary: prevents running on SitePoint servers
if (location.host.indexOf("sitepointstatic") >= 0) return
var xhr = new XMLHttpRequest();
if (xhr.upload && file.type == "image/jpeg" && file.size <= $id("MAX_FILE_SIZE").value) {
// create progress bar
var o = $id("progress");
var progress = o.appendChild(document.createElement("p"));
/*progress.appendChild(document.createTextNode("upload " + file.name));*/
// progress bar
xhr.upload.addEventListener("progress", function(e) {
var pc = parseInt(100 - (e.loaded / e.total * 100));
progress.style.backgroundPosition = pc + "% 0";
}, false);
// file received/failed
xhr.onreadystatechange = function(e) {
if (xhr.readyState == 4) {
progress.className = (xhr.status == 200 ? "success" : "failure");
}
};
// start upload
xhr.open("POST", $id("upload").action, true);
xhr.setRequestHeader("X_FILENAME", file.name);
xhr.send(file);
}
}
// initialize
function Init() {
var fileselect = $id("fileselect"),
filedrag = $id("filedrag"),
submitbutton = $id("submitbutton");
// file select
fileselect.addEventListener("change", FileSelectHandler, false);
// is XHR2 available?
var xhr = new XMLHttpRequest();
if (xhr.upload) {
// file drop
filedrag.addEventListener("dragover", FileDragHover, false);
filedrag.addEventListener("dragleave", FileDragHover, false);
filedrag.addEventListener("drop", FileSelectHandler, false);
filedrag.style.display = "block";
// remove submit button
submitbutton.style.display = "none";
}
}
// call initialization file
if (window.File && window.FileList && window.FileReader) {
Init();
}
})();