ajaxFileUpload 无刷新上传的原理:
在页面动态创建 form 表单和 ifram 贞,设定 form 表单提交的目标为 ifram 贞,
将文件域和要 post 的参数动态写入 form 表单中,然后提交 from 表单。
通过 window.attachEvent 向 ifram 贞的 onload 事件中注册监听事件响应回调函数。
1.html 部分
[html] view plaincopy
<input name="imgfile1" id="imgfile1" style="width: 200px; height: 25px;" size="38" type="file" />
<div id="imgContainer1"></div>
2.调用部分
[javascript] view plaincopy
function uploadImg(imgfileId, imgcontainerId) {
$.ajaxFileUpload({
fileElementId: imgfileId,
url: '/UploadImage',
dataType: 'json',
data: { id: 'aaa', name: 'bbb' },
beforeSend: function (XMLHttpRequest) {
//("loading");
},
success: function (data, textStatus) {
var img = "<img src='' width='300' height='300' />";
$("#" + imgcontainerId).append(img);
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
var img = "图片上传失败!";
$("#" + imgcontainerId).append(img);
var msg = "服务器出错,错误内容:" + XMLHttpRequest.responseText;
$.messager.showWin({ msg: msg, title: '错误提示', color: 'red' });
},
complete: function (XMLHttpRequest, textStatus) {
//("loaded");
}
});
}
3.ajaxFileUpload.js 全部代码
[javascript] view plaincopy
/*
131108-xxj-ajaxFileUpload.js 无刷新上传图片 jquery 插件,支持 ie6-ie10
依赖:jquery-1.6.1.min.js
主方法:ajaxFileUpload 接受 json 对象参数
参数说明:
fileElementId:必选,上传文件域ID
url:必选,发送请求的URL字符串
fileFilter:可选,限定上传文件的格式(.jpg,.bmp,.gif,.png)
fileSize:可选,0 为无限制(IE浏览器不兼容)
data:可选,将和文件域一同post的参数(json对象)
其它:$.ajax 的参数均为可选参数
注:如遇到‘无法访问’的脚本错误提示则需要在响应流中加一段脚块一同输出:<script ...>document.domain = 'xxx.com';</script>
*/
jQuery.extend({
//创建 iframe 元素,接受提交及响应
createUploadIframe: function(id, uri) {
//create frame
var frameId = 'jUploadFrame' + id;
if (window.ActiveXObject) {
//fix ie9 and ie 10-------------
if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
var 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;
},
//创建 from 元素,用于提交的表单
createUploadForm: function(id, fileElementId, postData) {
//create form<span style="white-space:pre"> </span>
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
var oldElement = $('#' + fileElementId);
var newElement = $(oldElement).clone();
$(oldElement).attr('id', fileId);
$(oldElement).before(newElement);
$(oldElement).appendTo(form);
//添加自定义参数
if (postData) {
//递归遍历JSON所有键值
function recurJson(json) {
for (var i in json) {
//alert(i+"="+json[i])
$("<input name='" + i + "' id='" + i + "' value='" + json[i] + "' />").appendTo(form);
if (typeof json[i] == "object") {
recurJson(json[i]);
}
}
}
recurJson(postData);
}
//set attributes
$(form).css('position', 'absolute');
$(form).css('top', '-1200px');
$(form).css('left', '-1200px');
$(form).appendTo('body');
return form;
},
//上传文件
//s 参数:json对象
ajaxFileUpload: function(s) {
s = jQuery.extend({fileFilter:"",fileSize:0}, jQuery.ajaxSettings, s);
//文件筛选
var fielName = $('#' + s.fileElementId).val();
var extention = fielName.substring(fielName.lastIndexOf(".") + 1).toLowerCase();
if (s.fileFilter && s.fileFilter.indexOf(extention) < 0) {
alert("仅支持 (" + s.fileFilter + ") 为后缀名的文件!");
return;
}
//文件大小限制
if (s.fileSize > 0) {
var fs = 0;
try {
if (window.ActiveXObject) {
//IE浏览器
var image = new Image();
image.dynsrc = fielName;
fs = image.fileSize;
} else {
fs = $('#' + s.fileElementId)[0].files[0].size;
}
} catch(e) {
}
if (fs > s.fileSize) {
alert("当前文件大小 (" + fs + ") 超过允许的限制值 (" + s.fileSize +")!");
return;
}
}
var id = new Date().getTime();
//创建 form 表单元素
var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
//创建 iframe 贞元素
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
//监测是否有新的请求
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart"); //触发 AJAX 请求开始时执行函数。Ajax 事件。
}
var requestDone = false;
//创建请求对象
var xml = {};
if (s.global)
jQuery.event.trigger("ajaxSend", [xml, s]); //触发 AJAX 请求发送前事件
//上载完成的回调函数
var uploadCallback = function(isTimeout) {
var io = document.getElementById(frameId);
try {
//存在跨域脚本访问问题,如遇到‘无法访问’提示则需要在响应流中加一段脚块:<script ...>document.domain = 'xxx.com';</script>
if (io.contentWindow) { //兼容各个浏览器,可取得子窗口的 window 对象
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) { //contentDocument Firefox 支持,> ie8 的ie支持。可取得子窗口的 document 对象。
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.handleErrorExt(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") {
//处理数据(运行XML通过httpData不管回调)
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.handleErrorExt(s, xml, status);
} catch(e) {
status = "error";
jQuery.handleErrorExt(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 {
$(io).remove();
$(form).remove();
} catch(e) {
jQuery.handleErrorExt(s, xml, null, e);
}
}, 100);
xml = null;
}
};
//超时检查,s.timeout 毫秒后调用 uploadCallback 回调函数提示请求超时
if (s.timeout > 0) {
setTimeout(function() {
// Check to see if the request is still happening
if (!requestDone) uploadCallback("timeout");
}, s.timeout);
}
try {
//设置动态 form 表单的提交参数
// var io = $('#' + frameId);
var form = $('#' + formId);
$(form).attr('action', s.url);
$(form).attr('method', 'POST');
$(form).attr('target', frameId);
if (form.encoding) {
form.encoding = 'multipart/form-data';
} else {
form.enctype = 'multipart/form-data';
}
$(form).submit();
} catch(e) {
jQuery.handleErrorExt(s, xml, null, e);
}
//向动态表单的页面加载事件中注册回调函数
if (window.attachEvent) {
document.getElementById(frameId).attachEvent('onload', uploadCallback);
} else {
document.getElementById(frameId).addEventListener('load', uploadCallback, false);
}
return {
abort: function() {
}
};
},
//上传文件
uploadHttpData: function(r, type) {
//alert("type=" + type + ";uploadHttpData" + JSON.stringify(r))
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if (type == "script")
jQuery.globalEval(data);
// Get the JavaScript object, if JSON is used.
if (type == "json")
eval("data = " + data);
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
//alert($('param', data).each(function(){alert($(this).attr('value'));}));
return data;
},
handleErrorExt: 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]);
}
}
});