ajaxfileupload.js

// JavaScript Document
jQuery
.extend({

createUploadIframe : function(id, uri) {
// create frame
var frameId = 'jUploadFrame' + id;
if (window.ActiveXObject) {
var ie_brwser_version = $.browser.version;
if (jQuery.browser.version == "9.0") {
io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
} else if (jQuery.browser.version == "6.0"
|| jQuery.browser.version == "7.0"
|| jQuery.browser.version == "8.0") {
var io = document.createElement('<iframe id="'
+ frameId + '" name="' + frameId + '" />');
if (typeof uri == 'boolean') {
io.src = 'javascript:false';
} else if (typeof uri == 'string') {
io.src = uri;
}
}
} else {
var io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}
io.style.position = 'absolute';
io.style.top = '-1000px';
io.style.left = '-1000px';

document.body.appendChild(io);

return io;
},
createUploadForm : function(id, fileElementId) {
// create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form  action="" method="POST" name="'
+ formId + '" id="' + formId
+ '" enctype="multipart/form-data"></form>');
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
newElement[0].files = oldElement[0].files;
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
// set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},

ajaxFileUpload : function(s) {
// TODO introduce global settings, allowing the client to modify
// them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = s.fileElementId;
var form = jQuery.createUploadForm(id, s.fileElementId);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;

if (s.global && !jQuery.active++) {
// Watch for a new set of requests
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// Create the request object
var xml = {};
if (s.global) {
jQuery.event.trigger("ajaxSend", [ xml, s ]);
}

var uploadCallback = function(isTimeout) {
// Wait for a response to come back
var io = document.getElementById(frameId);
try {
if (io.contentWindow) {
xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML
: null;
xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
: io.contentWindow.document;

} else if (io.contentDocument) {
xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML
: null;
xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
: io.contentDocument.document;
}
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
if (xml || isTimeout == "timeout") {
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success"
: "error";
// Make sure that the request was successful or
// notmodified
if (status != "error") {
// process the data (runs the xml through
// httpData regardless of callback)
var data = jQuery.uploadHttpData(xml,
s.dataType);
if (s.success) {
// ifa local callback was specified, fire it
// and pass it the data
s.success(data, status);
}
;
if (s.global) {
// Fire the global callback
jQuery.event.trigger("ajaxSuccess", [ xml,
s ]);
}
;
} else {
jQuery.handleError(s, xml, status);
}

} catch (e) {
status = "error";
jQuery.handleError(s, xml, status, e);
}
;
if (s.global) {
// The request was completed
jQuery.event.trigger("ajaxComplete", [ xml, s ]);
}
;

// Handle the global AJAX counter
if (s.global && !--jQuery.active) {
jQuery.event.trigger("ajaxStop");
}
;
if (s.complete) {
s.complete(xml, status);
}
;

jQuery(io).unbind();

setTimeout(function() {
try {
jQuery(io).remove();
jQuery(form).remove();

} catch (e) {
jQuery.handleError(s, xml, null, e);
}

}, 100);

xml = null;

}
;
}
// Timeout checker
if (s.timeout > 0) {
setTimeout(function() {

if (!requestDone) {
// Check to see ifthe request is still happening
uploadCallback("timeout");
}

}, s.timeout);
}
try {
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if (form.encoding) {
form.encoding = 'multipart/form-data';
} else {
form.enctype = 'multipart/form-data';
}
jQuery(form).submit();

} catch (e) {
jQuery.handleError(s, xml, null, e);
}
if (window.attachEvent) {

document.getElementById(frameId).attachEvent('onload',uploadCallback);
} else {
document.getElementById(frameId).addEventListener('load',
uploadCallback, false);
}
return {
abort : function() {
}
};

},
handleError : function(s, xhr, status, e) {
// If a local callback was specified, fire it
if (s.error) {
s.error.call(s.context || s, xhr, status, e);
}

// Fire the global callback
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger(
"ajaxError", [ xhr, s, e ]);
}
},
uploadHttpData : function(r, type) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// ifthe type is "script", eval it in global context
if (type == "script") {
jQuery.globalEval(data);
}

// Get the JavaScript object, ifJSON is used.
if (type == "json") {
if(data.indexOf("pre")>0){
data=jQuery.parseJSON(jQuery(data).text());
}else{
eval("data = " + data);
}

}

// evaluate scripts within html
if (type == "html") {
jQuery("<div>").html(data).evalScripts();
}
// evaluate scripts within html
if (type == "text") {
data = jQuery.parseJSON(jQuery(data).text());
}

return data;
}
});