jQuery.extend({
createUploadIframe: function (id,uri) {
//create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if (window.ActiveXObject) {
if (typeof uri == 'boolean') {
iframeHtml += ' src="' + 'javascript:false' + '"';
}
else if (typeof uri == 'string') {
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},createUploadForm: function (id,fileElementId,data) {
//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>');
if (data) {
for (var i in data) {
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone(true);
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 = new Date().getTime()
var form = jQuery.createUploadForm(id,s.fileElementId,(typeof (s.data) == 'undefined' ? false : s.data));
var io = jQuery.createUploadIframe(id,s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// Create the request object
var xml = {}
if (s.global)
jQuery.event.trigger("ajaxSend",[xml,s]);
// Wait for a response to come back
var uploadCallback = function (isTimeout) {
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 a local callback was specified,fire it and pass it the data
if (s.success)
s.success(data,status);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxSuccess",s]);
} else
jQuery.handleError(s,status);
} catch (e) {
status = "error";
jQuery.handleError(s,status,e);
}
// The request was completed
if (s.global)
jQuery.event.trigger("ajaxComplete",s]);
// Handle the global AJAX counter
if (s.global && ! --jQuery.active)
jQuery.event.trigger("ajaxStop");
// Process result
if (s.complete)
s.complete(xml,status);
jQuery(io).unbind()
setTimeout(function () {
try {
jQuery(io).remove();
jQuery(form).remove();
} catch (e) {
jQuery.handleError(s,e);
}
},100)
xml = null
}
}
// Timeout checker
if (s.timeout > 0) {
setTimeout(function () {
// Check to see if the request is still happening
if (!requestDone) 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) {
jQuery(form).attr('encoding','multipart/form-data');
}
else {
jQuery(form).attr('enctype','multipart/form-data');
}
jQuery(form).submit();
} catch (e) {
jQuery.handleError(s,e);
}
jQuery('#' + frameId).load(uploadCallback);
return { abort: function () { } };
},uploadHttpData: function (r,type) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script",eval it in global context
if (type == "script")
jQuery.globalEval(data);
// Get the JavaScript object,if JSON is used.
if (type == "json")
eval("data = " + data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
},handleError: function (s,xhr,e) {
// If a local callback was specified,fire it
if (s.error) {
s.error.call(s.context || s,e);
}
// Fire the global callback
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError",[xhr,s,e]);
}
}
})
var newElement = jQuery(oldElement).clone(true);
原文链接：https://www.f2er.com/ajax/161971.html