html:
<script charset="utf-8" src="js/ajaxfileupload.js"></script>
<input style="display:;" type="file" id="userfile" onchange="ajaxFileUpload('userfile')" value="" name="userfile" />
Javascript:
function ajaxFileUpload(id){
//图片格式验证
var x = $('#'+id);
if (!x || !x.val()) return;
var patn = /\.jpg$|\.jpeg$|\.png$|\.gif$/i;
if (!patn.test(x.val())) {
alert("您选择的不是图片");
x.val() = "";
return;
}
$.ajaxFileUpload({
url: "upload.PHP",//上传的url，自己设置
type: 'post',secureuri: false,//一般设置为false
fileElementId: id,// 上传文件的id、name属性名
dataType: 'text',//返回值类型，一般设置为json、application/json
data: {'userfile':id,'time':new Date().getTime()},//传参
success: function (data,status) {
data = data.replace(/<.*?>/g,'');
var obj = eval('(' + data + ')');
if(obj.url == ''){
alert(obj.msg);
return;
}
},error: function (data,status,e) {
alert('[未知错误]'+e);
}
});
//return false;
}
ajaxfileupload.js（下载：http://download.csdn.net/download/macwhirr123/9730450）
// JavaScript Document
jQuery.extend({
createUploadIframe: function(id,uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
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,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>');
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id',fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
/*
var oldElement = jQuery('#' + fileElementId);
var newElement = oldElement.clone(true);
newElement[0].files=oldElement[0].files;
oldElement.attr('id',fileId);
oldElement.before(newElement);
oldElement.appendTo(form);*/
//增加文本参数的支持
if (data) {
for (var i in data) {
$('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').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,s.data);
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",s] );
};
} else
{
jQuery.handleError(s,status);
}
} catch(e)
{
status = "error";
jQuery.handleError(s,e);
};
if( s.global )
{
// The request was completed
jQuery.event.trigger( "ajaxComplete",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,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,e);
}
if(window.attachEvent){
document.getElementById(frameId).attachEvent('onload',uploadCallback);
}
else{
document.getElementById(frameId).addEventListener('load',uploadCallback,false);
}
return {abort: function () {}};
},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" )
{
eval( "data = " + data );
}
// evaluate scripts within html
if( type == "html" )
{
jQuery("<div>").html(data).evalScripts();
}
return data;
},handleError: function (s,xhr,e) {
if (s.error) {
s.error.call(s.context || s,e);
}
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError",[xhr,s,e]);
}
},httpData: function (xhr,type,s) {
var ct = xhr.getResponseHeader("content-type"),xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0,data = xml ? xhr.responseXML : xhr.responseText;
if (xml && data.documentElement.tagName == "parsererror")
throw "parsererror";
if (s && s.dataFilter)
data = s.dataFilter(data,type);
if (typeof data === "string") {
if (type == "script")
jQuery.globalEval(data);
if (type == "json")
data = window["eval"]("(" + data + ")");
}
return data;
}
});
原文链接：https://www.f2er.com/ajax/161514.html