ajaxfileupload.js源码

ajaxfileupload.js源码

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' +
'"';

}

elseif(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();

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;

}elseif(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", [xml, s] );

} else

jQuery.handleError(s, xml, status);

} catch(e)

{

status = "error";

jQuery.handleError(s, xml, status, e);

}

// The request was completed

if( s.global )

jQuery.event.trigger( "ajaxComplete", [xml, 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, xml, null, 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, xml, null, 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;

}
})