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/******************************************************************************
* HTML5 Multiple File Uploader Demo *
******************************************************************************/
// Constants
var MAX_UPLOAD_FILE_SIZE = 1024*1024; // 1 MB
var UPLOAD_URL = "/upload";
var NEXT_URL = "/files/";
// List of pending files to handle when the Upload button is finally clicked.
var PENDING_FILES = [];
$(document).ready(function() {
// Set up the drag/drop zone.
initDropbox();
// Set up the handler for the file input box.
$("#file-picker").on("change", function() {
handleFiles(this.files);
});
// Handle the submit button.
$("#upload-button").on("click", function(e) {
// If the user has JS disabled, none of this code is running but the
// file multi-upload input box should still work. In this case they'll
// just POST to the upload endpoint directly. However, with JS we'll do
// the POST using ajax and then redirect them ourself when done.
e.preventDefault();
doUpload();
})
});
function doUpload() {
$("#progress").show();
var $progressBar = $("#progress-bar");
// Gray out the form.
$("#upload-form :input").attr("disabled", "disabled");
// Initialize the progress bar.
$progressBar.css({"width": "0%"});
// Collect the form data.
fd = collectFormData();
// Attach the files.
for (var i = 0, ie = PENDING_FILES.length; i < ie; i++) {
// Collect the other form data.
fd.append("file", PENDING_FILES[i]);
}
// Inform the back-end that we're doing this over ajax.
fd.append("__ajax", "true");
var xhr = $.ajax({
xhr: function() {
var xhrobj = $.ajaxSettings.xhr();
if (xhrobj.upload) {
xhrobj.upload.addEventListener("progress", function(event) {
var percent = 0;
var position = event.loaded || event.position;
var total = event.total;
if (event.lengthComputable) {
percent = Math.ceil(position / total * 100);
}
// Set the progress bar.
$progressBar.css({"width": percent + "%"});
$progressBar.text(percent + "%");
}, false)
}
return xhrobj;
},
url: UPLOAD_URL,
method: "POST",
contentType: false,
processData: false,
cache: false,
data: fd,
success: function(data) {
$progressBar.css({"width": "100%"});
data = JSON.parse(data);
// How'd it go?
if (data.status === "error") {
// Uh-oh.
window.alert(data.msg);
$("#upload-form :input").removeAttr("disabled");
return;
}
else {
// Ok! Get the UUID.
var uuid = data.msg;
window.location = NEXT_URL + uuid;
}
},
});
}
function collectFormData() {
// Go through all the form fields and collect their names/values.
var fd = new FormData();
$("#upload-form :input").each(function() {
var $this = $(this);
var name = $this.attr("name");
var type = $this.attr("type") || "";
var value = $this.val();
// No name = no care.
if (name === undefined) {
return;
}
// Skip the file upload box for now.
if (type === "file") {
return;
}
// Checkboxes? Only add their value if they're checked.
if (type === "checkbox" || type === "radio") {
if (!$this.is(":checked")) {
return;
}
}
fd.append(name, value);
});
return fd;
}
function handleFiles(files) {
// Add them to the pending files list.
for (var i = 0, ie = files.length; i < ie; i++) {
PENDING_FILES.push(files[i]);
}
}
function initDropbox() {
var $dropbox = $("#dropbox");
// On drag enter...
$dropbox.on("dragenter", function(e) {
e.stopPropagation();
e.preventDefault();
$(this).addClass("active");
});
// On drag over...
$dropbox.on("dragover", function(e) {
e.stopPropagation();
e.preventDefault();
});
// On drop...
$dropbox.on("drop", function(e) {
e.preventDefault();
$(this).removeClass("active");
// Get the files.
var files = e.originalEvent.dataTransfer.files;
handleFiles(files);
// Update the display to acknowledge the number of pending files.
$dropbox.text(PENDING_FILES.length + " files ready for upload!");
});
// If the files are dropped outside of the drop zone, the browser will
// redirect to show the files in the window. To avoid that we can prevent
// the 'drop' event on the document.
function stopDefault(e) {
e.stopPropagation();
e.preventDefault();
}
$(document).on("dragenter", stopDefault);
$(document).on("dragover", stopDefault);
$(document).on("drop", stopDefault);
}
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