AjaxUpLoad.js的使用实现无刷新文件上传，如图。
图1 文件上传前
图2 文件上传后
1、创建页面并编写HTML
上传文档:
<div class=\"uploadFile\"> <span id=\"doc\"><input type=\"text\" disabled=\"disabled\" /></span> <input type=\"hidden\" id=\"hidFileName\" /> <input type=\"button\" id=\"btnUploadFile\" value=\"上传\" /> <input type=\"button\" id=\"btnDeleteFile\" value=\"删除\" /> </div>
上传图片:
<div class=\"uploadImg\"> <img id=\"imgShow\" src=\"/images/nophoto.gif\" /> <input type=\"hidden\" id=\"hidImgName\" /> <input type=\"button\" id=\"btnUploadImg\" value=\"上传\" /> <input type=\"button\" id=\"btnDeleteImg\" value=\"删除\" /> </div>
2、引用AjaxUpload.js文件
<script src=\"/js/common/AjaxUpload.js\" type=\"text/javascript\"></script>
3、编写JS脚本
window.onload = function() {
init(); //初始化
}
//初始化
function init() {
//初始化文档上传
var btnFile = document.getElementById(\"btnUploadFile\");
var doc = document.getElementById(\"doc\");
var hidFileName = document.getElementById(\"hidFileName\");
document.getElementById(\"btnDeleteFile\").onclick = function() { DelFile(doc, hidFileName); };
g_AjxUploadFile(btnFile, doc, hidFileName);
//初始化图片上传
var btnImg = document.getElementById(\"btnUploadImg\");
var img = document.getElementById(\"imgShow\");
var hidImgName = document.getElementById(\"hidImgName\");
document.getElementById(\"btnDeleteImg\").onclick = function() { DelImg(img, hidImgName); };
g_AjxUploadImg(btnImg, img, hidImgName);
}
var g_AjxTempDir = \"/file/temp/\";
//文档上传
function g_AjxUploadFile(btn, doc, hidPut, action) {
var button = btn, interval;
new AjaxUpload(button, {
action: ((action == null || action == undefined) ? \'/Common/UploadHandler.ashx?fileType=file\' : action),
data: {},
name: \'myfile\',
onSubmit: function(file, ext) {
if (!(ext && /^(rar|zip|pdf|pdfx|txt|csv|xls|xlsx|doc|docx|RAR|ZIP|PDF|PDFX|TXT|CSV|XLS|XLSX|DOC|DOCX)$/.test(ext))) {
alert(\"您上传的文档格式不对，请重新选择！\");
return false;
}
},
onComplete: function(file, response) {
flagValue = response;
if (flagValue == \"1\") {
alert(\"您上传的文档格式不对，请重新选择！\");
}
else if (flagValue == \"2\") {
alert(\"您上传的文档大于2M，请重新选择！\");
}
else if (flagValue == \"3\") {
alert(\"文档上传失败！\");
}
else {
hidPut.value = response;
doc.innerHTML=\"<a href=\'\" + g_AjxTempDir + response + \"\' target=\'_blank\'>\" + response + \"</a>\";
}
}
});
}
//图片上传
function g_AjxUploadImg(btn, img, hidPut) {
var button = btn, interval;
new AjaxUpload(button, {
action: \'/Common/UploadHandler.ashx?fileType=img\',
data: {},
name: \'myfile\',
onSubmit: function(file, ext) {
if (!(ext && /^(jpg|JPG|png|PNG|gif|GIF)$/.test(ext))) {
alert(\"您上传的图片格式不对，请重新选择！\");
return false;
}
},
onComplete: function(file, response) {
flagValue = response;
if (flagValue == \"1\") {
alert(\"您上传的图片格式不对，请重新选择！\");
}
else if (flagValue == \"2\") {
alert(\"您上传的图片大于200K，请重新选择！\");
}
else if (flagValue == \"3\") {
alert(\"图片上传失败！\");
}
else {
hidPut.value = response;
img.src = g_AjxTempDir + response;
}
}
});
}
//删除文档
function DelFile(doc, hidPut) {
hidPut.value = \"\";
doc.innerHTML = \"<input type=\\\"text\\\" disabled=\\\"disabled\\\" />\";
}
//删除图片
function DelImg(img, hidPut) {
hidPut.value = \"\";
img.src = \"/images/nophoto.gif\";
}
4、创建/Common/UploadHandler.ashx处理程序
<%@ WebHandler Language=\"C#\" Class=\"UploadHandler\" %>
using System;
using System.Web;
using System.Text.RegularExpressions;
using System.IO;
public class UploadHandler : IHttpHandler {
private string _filedir = \"\"; //文件目录
/// <summary>
/// 处理上传文件(1:文件格式不正确、2:文件大小不正确、3:上传失败、文件名称:上传成功)
/// </summary>
/// <param name=\"context\"></param>
public void ProcessRequest (HttpContext context) {
_filedir = context.Server.MapPath(@\"/file/temp/\");
try
{
string result = \"3\";
string fileType = context.Request.QueryString[\"fileType\"]; //获取上传文件类型
if (fileType == \"file\")
{
result = UploadFile(context); //文档上传
}
else if (fileType == \"img\")
{
result = UploadImg(context); //图片上传
}
context.Response.Write(result);
}
catch
{
context.Response.Write(\"3\");//3文件上传失败
}
}
/// <summary>
/// 文档上传
/// </summary>
/// <param name=\"context\"></param>
/// <returns></returns>
private string UploadFile(HttpContext context)
{
int cout = context.Request.Files.Count;
if (cout > 0)
{
HttpPostedFile hpf = context.Request.Files[0];
if (hpf != null)
{
string fileExt = Path.GetExtension(hpf.FileName).ToLower();
//只能上传文件，过滤不可上传的文件类型
string fileFilt = \".rar|.zip|.pdf|.pdfx|.txt|.csv|.xls|.xlsx|.doc|.docx......\";
if (fileFilt.IndexOf(fileExt) <= -1)
{
return \"1\";
}
//判断文件大小
int length = hpf.ContentLength;
if (length > 2097152)
{
return \"2\";
}
Random rd = new Random();
DateTime nowTime = DateTime.Now;
string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);
if (!Directory.Exists(_filedir))
{
Directory.CreateDirectory(_filedir);
}
string fileName = _filedir + newFileName;
hpf.SaveAs(fileName);
return newFileName;
}
}
return \"3\";
}
/// <summary>
/// 图片上传
/// </summary>
/// <param name=\"context\"></param>
/// <returns></returns>
private string UploadImg(HttpContext context)
{
int cout = context.Request.Files.Count;
if (cout > 0)
{
HttpPostedFile hpf = context.Request.Files[0];
if (hpf != null)
{
string fileExt = Path.GetExtension(hpf.FileName).ToLower();
//只能上传文件，过滤不可上传的文件类型
string fileFilt = \".gif|.jpg|.php|.jsp|.jpeg|.png|......\";
if (fileFilt.IndexOf(fileExt) <= -1)
{
return \"1\";
}
//判断文件大小
int length = hpf.ContentLength;
if (length > 204800)
{
return \"2\";
}
Random rd = new Random();
DateTime nowTime = DateTime.Now;
string newFileName = nowTime.Year.ToString() + nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + Path.GetExtension(hpf.FileName);
if (!Directory.Exists(_filedir))
{
Directory.CreateDirectory(_filedir);
}
string fileName = _filedir + newFileName;
hpf.SaveAs(fileName);
return newFileName;
}
}
return \"3\";
}
#region IHttpHandler 成员
public bool IsReusable
{
get { throw new NotImplementedException(); }
}
#endregion
}
附件1：页面CSS样式
/*上传文件*/
.uploadFile{margin-bottom:10px;}
/*上传图片*/
.uploadImg{}
.uploadImg img{width:102px; height:64px; border:1px solid #CCCCCC; display: block;}
附件2：AjaxUpload.js文件
/**
* AJAX Upload ( http://valums.com/ajax-upload/ )
* Copyright (c) Andris Valums
* Licensed under the MIT license ( http://valums.com/mit-license/ )
* Thanks to Gary Haran, David Mark, Corey Burns and others for contributions
*/
(function () {
/* global window */
/* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true */
/**
* Wrapper for FireBug\'s console.log
*/
function log() {
if (typeof(console) != \'undefined\' && typeof(console.log) == \'function\') {
Array.prototype.unshift.call(arguments, \'[Ajax Upload]\');
console.log(Array.prototype.join.call(arguments, \' \'));
}
}
/**
* Attaches event to a dom element.
* @param {Element} el
* @param type event name
* @param fn callback This refers to the passed element
*/
function addEvent(el, type, fn) {
if (el.addEventListener) {
el.addEventListener(type, fn, false);
} else if (el.attachEvent) {
el.attachEvent(\'on\' + type, function () {
fn.call(el);
});
} else {
throw new Error(\'not supported or DOM not loaded\');
}
}
/**
* Attaches resize event to a window, limiting
* number of event fired. Fires only when encounteres
* delay of 100 after series of events.
*
* Some browsers fire event multiple times when resizing
* http://www.quirksmode.org/dom/events/resize.html
*
* @param fn callback This refers to the passed element
*/
function addResizeEvent(fn) {
var timeout;
addEvent(window, \'resize\', function () {
if (timeout) {
clearTimeout(timeout);
}
timeout = setTimeout(fn, 100);
});
}
// Needs more testing, will be rewriten for next version
// getOffset function copied from jQuery lib (http://jquery.com/)
if (document.documentElement.getBoundingClientRect) {
// Get Offset using getBoundingClientRect
// http://ejohn.org/blog/getboundingclientrect-is-awesome/
var getOffset = function (el) {
var box = el.getBoundingClientRect();
var doc = el.ownerDocument;
var body = doc.body;
var docElem = doc.documentElement; // for ie
var clientTop = docElem.clientTop || body.clientTop || 0;
var clientLeft = docElem.clientLeft || body.clientLeft || 0;
// In Internet Explorer 7 getBoundingClientRect property is treated as physical,
// while others are logical. Make all logical, like in IE8.
var zoom = 1;
if (body.getBoundingClientRect) {
var bound = body.getBoundingClientRect();
zoom = (bound.right - bound.left) / body.clientWidth;
}
if (zoom > 1) {
clientTop = 0;
clientLeft = 0;
}
var top = box.top / zoom + (window.pageYOffset || docElem && docElem.scrollTop / zoom || body.scrollTop / zoom) - clientTop,
left = box.left / zoom + (window.pageXOffset || docElem && docElem.scrollLeft / zoom || body.scrollLeft / zoom) - clientLeft;
return {
top: top,
left: left
};
};
} else {
// Get offset adding all offsets
var getOffset = function (el) {
var top = 0,
left = 0;
do {
top += el.offsetTop || 0;
left += el.offsetLeft || 0;
el = el.offsetParent;
} while (el);
return {
left: left,
top: top
};
};
}
/**
* Returns left, top, right and bottom properties describing the border-box,
* in pixels, with the top-left relative to the body
* @param {Element} el
* @return {Object} Contains left, top, right,bottom
*/
function getBox(el) {
var left, right, top, bottom;
var offset = getOffset(el);
left = offset.left;
top = offset.top;
right = left + el.offsetWidth;
bottom = top + el.offsetHeight;
return {
left: left,
right: right,
top: top,
bottom: bottom
};
}
/**
* Helper that takes object literal
* and add all properties to element.style
* @param {Element} el
* @param {Object} styles
*/
function addStyles(el, styles) {
for (var name in styles) {
if (styles.hasOwnProperty(name)) {
el.style[name] = styles[name];
}
}
}
/**
* Function places an absolutely positioned
* element on top of the specified element
* copying position and dimentions.
* @param {Element} from
* @param {Element} to
*/
function copyLayout(from, to) {
var box = getBox(from);
addStyles(to, {
position: \'absolute\',
left: box.left + \'px\',
top: box.top + \'px\',
width: from.offsetWidth + \'px\',
height: from.offsetHeight + \'px\'
});
}
/**
* Creates and returns element from html chunk
* Uses innerHTML to create an element
*/
var toElement = (function () {
var div = document.createElement(\'div\');
return function (html) {
div.innerHTML = html;
var el = div.firstChild;
return div.removeChild(el);
};
})();
/**
* Function generates unique id
* @return unique id
*/
var getUID = (function () {
var id = 0;
return function () {
return \'ValumsAjaxUpload\' + id++;
};
})();
/**
* Get file name from path
* @param {String} file path to file
* @return filename
*/
function fileFromPath(file) {
return file.replace(/.*(\\/|\\\\)/, \"\");
}
/**
* Get file extension lowercase
* @param {String} file name
* @return file extenstion
*/
function getExt(file) {
return (-1 !== file.indexOf(\'.\')) ? file.replace(/.*[.]/, \'\') : \'\';
}
function hasClass(el, name) {
var re = new RegExp(\'\\\\b\' + name + \'\\\\b\');
return re.test(el.className);
}
function addClass(el, name) {
if (!hasClass(el, name)) {
el.className += \' \' + name;
}
}
function removeClass(el, name) {
var re = new RegExp(\'\\\\b\' + name + \'\\\\b\');
el.className = el.className.replace(re, \'\');
}
function removeNode(el) {
el.parentNode.removeChild(el);
}
/**
* Easy styling and uploading
* @constructor
* @param button An element you want convert to
* upload button. Tested dimentions up to 500x500px
* @param {Object} options See defaults below.
*/
window.AjaxUpload = function (button, options) {
this._settings = {
// Location of the server-side upload script
action: \'upload.php\',
// File upload name
name: \'userfile\',
// Additional data to send
data: {},
// Submit file as soon as it\'s selected
autoSubmit: true,
// The type of data that you\'re expecting back from the server.
// html and xml are detected automatically.
// Only useful when you are using json data as a response.
// Set to \"json\" in that case.
responseType: false,
// Class applied to button when mouse is hovered
hoverClass: \'hover\',
// Class applied to button when AU is disabled
disabledClass: \'disabled\',
// When user selects a file, useful with autoSubmit disabled
// You can return false to cancel upload
onChange: function (file, extension) {},
// Callback to fire before file is uploaded
// You can return false to cancel upload
onSubmit: function (file, extension) {},
// Fired when file upload is completed
// WARNING! DO NOT USE \"FALSE\" STRING AS A RESPONSE!
onComplete: function (file, response) {}
};
// Merge the users options with our defaults
for (var i in options) {
if (options.hasOwnProperty(i)) {
this._settings[i] = options[i];
}
}
// button isn\'t necessary a dom element
if (button.jquery) {
// jQuery object was passed
button = button[0];
} else if (typeof button == \"string\") {
if (/^#.*/.test(button)) {
// If jQuery user passes #elementId don\'t break it
button = button.slice(1);
}
button = document.getElementById(button);
}
if (!button || button.nodeType !== 1) {
throw new Error(\"Please make sure that you\'re passing a valid element\");
}
if (button.nodeName.toUpperCase() == \'A\') {
// disable link
addEvent(button, \'click\', function (e) {
if (e && e.preventDefault) {
e.preventDefault();
} else if (window.event) {
window.event.returnValue = false;
}
});
}
// DOM element
this._button = button;
// DOM element
this._input = null;
// If disabled clicking on button won\'t do anything
this._disabled = false;
// if the button was disabled before refresh if will remain
// disabled in FireFox, let\'s fix it
this.enable();
this._rerouteClicks();
};
// assigning methods to our class
AjaxUpload.prototype = {
setData: function (data) {
this._settings.data = data;
},
disable: function () {
addClass(this._button, this._settings.disabledClass);
this._disabled = true;
var nodeName = this._button.nodeName.toUpperCase();
if (nodeName == \'INPUT\' || nodeName == \'BUTTON\') {
this._button.setAttribute(\'disabled\', \'disabled\');
}
// hide input
if (this._input) {
// We use visibility instead of display to fix problem with Safari 4
// The problem is that the value of input doesn\'t change if it
// has display none when user selects a file
this._input.parentNode.style.visibility = \'hidden\';
}
},
enable: function () {
removeClass(this._button, this._settings.disabledClass);
this._button.removeAttribute(\'disabled\');
this._disabled = false;
},
/**
* Creates invisible file input
* that will hover above the button
* <div><input type=\'file\' /></div>
*/
_createInput: function () {
var self = this;
var input = document.createElement(\"input\");
input.setAttribute(\'type\', \'file\');
input.setAttribute(\'name\', this._settings.name);
addStyles(input, {
\'position\': \'absolute\',
// in Opera only \'browse\' button
// is clickable and it is located at
// the right side of the input
\'right\': 0,
\'margin\': 0,
\'padding\': 0,
\'fontSize\': \'480px\',
\'cursor\': \'pointer\'
});
var div = document.createElement(\"div\");
addStyles(div, {
\'display\': \'block\',
\'position\': \'absolute\',
\'overflow\': \'hidden\',
\'margin\': 0,
\'padding\': 0,
\'opacity\': 0,
// Make sure browse button is in the right side
// in Internet Explorer
\'direction\': \'ltr\',
//Max zIndex supported by Opera 9.0-9.2
\'zIndex\': 2147483583
});
// Make sure that element opacity exists.
// Otherwise use IE filter
if (div.style.opacity !== \"0\") {
if (typeof(div.filters) == \'undefined\') {
throw new Error(\'Opacity not supported by the browser\');
}
div.style.filter = \"alpha(opacity=0)\";
}
addEvent(input, \'change\', function () {
if (!input || input.value === \'\') {
return;
}
// Get filename from input, required
// as some browsers have path instead of it
var file = fileFromPath(input.value);
if (false === self._settings.onChange.call(self, file, getExt(file))) {
self._clearInput();
return;
}
// Submit form when value is changed
if (self._settings.autoSubmit) {
self.submit();
}
});
addEvent(input, \'mouseover\', function () {
addClass(self._button, self._settings.hoverClass);
});
addEvent(input, \'mouseout\', function () {
removeClass(self._button, self._settings.hoverClass);
// We use visibility instead of display to fix problem with Safari 4
// The problem is that the value of input doesn\'t change if it
// has display none when user selects a file
input.parentNode.style.visibility = \'hidden\';
});
div.appendChild(input);
document.body.appendChild(div);
this._input = input;
},
_clearInput: function () {
if (!this._input) {
return;
}
// this._input.value = \'\'; Doesn\'t work in IE6
removeNode(this._input.parentNode);
this._input = null;
this._createInput();
removeClass(this._button, this._settings.hoverClass);
},
/**
* Function makes sure that when user clicks upload button,
* the this._input is clicked instead
*/
_rerouteClicks: function () {
var self = this;
// IE will later display \'access denied\' error
// if you use using self._input.click()
// other browsers just ignore click()
addEvent(self._button, \'mouseover\', function () {
if (self._disabled) {
return;
}
if (!self._input) {
self._createInput();
}
var div = self._input.parentNode;
copyLayout(self._button, div);
div.style.visibility = \'visible\';
});
// commented because we now hide input on mouseleave
/**
* When the window is resized the elements
* can be misaligned if button position depends
* on window size
*/
//addResizeEvent(function(){
// if (self._input){
// copyLayout(self._button, self._input.parentNode);
// }
//});
},
/**
* Creates iframe with unique name
* @return {Element} iframe
*/
_createIframe: function () {
// We can\'t use getTime, because it sometimes return
// same value in safari :(
var id = getUID();
// We can\'t use following code as the name attribute
// won\'t be properly registered in IE6, and new window
// on form submit will open
// var iframe = document.createElement(\'iframe\');
// iframe.setAttribute(\'name\', id);
var iframe = toElement(\'<iframe src=\"javascript:false;\" name=\"\' + id + \'\" />\');
// src=\"javascript:false; was added
// because it possibly removes ie6 prompt
// \"This page contains both secure and nonsecure items\"
// Anyway, it doesn\'t do any harm.
iframe.setAttribute(\'id\', id);
iframe.style.display = \'none\';
document.body.appendChild(iframe);
return iframe;
},
/**
* Creates form, that will be submitted to iframe
* @param {Element} iframe Where to submit
* @return {Element} form
*/
_createForm: function (iframe) {
var settings = this._settings;
// We can\'t use the following code in IE6
// var form = document.createElement(\'form\');
// form.setAttribute(\'method\', \'post\');
// form.setAttribute(\'enctype\', \'multipart/form-data\');
// Because in this case file won\'t be attached to request
var form = toElement(\'<form method=\"post\" enctype=\"multipart/form-data\"></form>\');
form.setAttribute(\'action\', settings.action);
form.setAttribute(\'target\', iframe.name);
form.style.display = \'none\';
document.body.appendChild(form);
// Create hidden input element for each data key
for (var prop in settings.data) {
if (settings.data.hasOwnProperty(prop)) {
var el = document.createElement(\"input\");
el.setAttribute(\'type\', \'hidden\');
el.setAttribute(\'name\', prop);
el.setAttribute(\'value\', settings.data[prop]);
form.appendChild(el);
}
}
return form;
},
/**
* Gets response from iframe and fires onComplete event when ready
* @param iframe
* @param file Filename to use in onComplete callback
*/
_getResponse: function (iframe, file) {
// getting response
var toDeleteFlag = false,
self = this,
settings = this._settings;
addEvent(iframe, \'load\', function () {
if ( // For Safari
iframe.src == \"javascript:\'%3Chtml%3E%3C/html%3E\';\" ||
// For FF, IE
iframe.src == \"javascript:\'<html></html>\';\") {
// First time around, do not delete.
// We reload to blank page, so that reloading main page
// does not re-submit the post.
if (toDeleteFlag) {
// Fix busy state in FF3
setTimeout(function () {
removeNode(iframe);
},
0);
}
return;
}
var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document;
// fixing Opera 9.26,10.00
if (doc.readyState && doc.readyState != \'complete\') {
// Opera fires load event multiple times
// Even when the DOM is not ready yet
// this fix should not affect other browsers
return;
}
// fixing Opera 9.64
if (doc.body && doc.body.innerHTML == \"false\") {
// In Opera 9.64 event was fired second time
// when body.innerHTML changed from false
// to server response approx. after 1 sec
return;
}
var response;
if (doc.XMLDocument) {
// response is a xml document Internet Explorer property
response = doc.XMLDocument;
} else if (doc.body) {
// response is html document or plain text
response = doc.body.innerHTML;
if (settings.responseType && settings.responseType.toLowerCase() == \'json\') {
// If the document was sent as \'application/javascript\' or
// \'text/javascript\', then the browser wraps the text in a <pre>
// tag and performs html encoding on the contents. In this case,
// we need to pull the original text content from the text node\'s
// nodeValue property to retrieve the unmangled content.
// Note that IE6 only understands text/html
if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == \'PRE\') {
response = doc.body.firstChild.firstChild.nodeValue;
}
if (response) {
response = eval(\"(\" + response + \")\");
} else {
response = {};
}
}
} else {
// response is a xml document
response = doc;
}
settings.onComplete.call(self, file, response);
// Reload blank page, so that reloading main page
// does not re-submit the post. Also, remember to
// delete the frame
toDeleteFlag = true;
// Fix IE mixed content issue
iframe.src = \"javascript:\'<html></html>\';\";
});
},
/**
* Upload file contained in this._input
*/
submit: function () {
var self = this,
settings = this._settings;
if (!this._input || this._input.value === \'\') {
return;
}
var file = fileFromPath(this._input.value);
// user returned false to cancel upload
if (false === settings.onSubmit.call(this, file, getExt(file))) {
this._clearInput();
return;
}
// sending request
var iframe = this._createIframe();
var form = this._createForm(iframe);
// assuming following structure
// div -> input type=\'file\'
removeNode(this._input.parentNode);
removeClass(self._button, self._settings.hoverClass);
form.appendChild(this._input);
form.submit();
// request set, clean up
removeNode(form);
form = null;
removeNode(this._input);
this._input = null;
// Get response from iframe and fire onComplete event when ready
this._getResponse(iframe, file);
// get ready for next request
this._createInput();
}
};
})();
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
© 版权声明
THE END
暂无评论内容