ajax文件上传+处理浏览器兼容

这次给大家带来ajax文件上传+处理浏览器兼容，ajax文件上传+处理浏览器兼容的注意事项有哪些，下面就是实战案例，一起来看一下。

ajaxfileupload控制很好用，不过发现上传文件后的结果为被浏览器处理，IE不会，谷哥和火狐都会进行处理，而且谷哥和火狐处理后的结果都不一样，这里对以上三种浏览器进行了兼容性调整。

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,fileElement)
 {
 //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;
 if(fileElement == null)
  oldElement = jQuery('#' + fileElementId);
 else
  oldElement = fileElement;
  
 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),s.fileElement);
 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)
   console.log( jQuery.uploadHttpData);
   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(){
  try
  {
  jQuery('#' + frameId).remove();
  jQuery(form).remove();
  }
  catch(e){}
 }};
 },
 
 uploadHttpData: function( r, type ) {
 var data ="";
 data = (type == "xml" ? r.responseXML : r.responseText);
 if ( type == "script" )
  jQuery.globalEval( data );
 /**
  * auth garen 2016-06-17
  * 对文件上传后的响应结果进行处理，支持IE FF GC
  * */
 if ( type == "json" ){
  var reg ="";
  if(data.indexOf("<pre>")>-1){
  reg=/<pre>(.+)<\/pre>/g;
  }else{  
  reg=/<pre.+?>(.+)<\/pre>/g; 
  }
  var result = data.match(reg);
  var stri1=RegExp.$1; 
  if(stri1!=null&&stri1!="" &&stri1.trim().length>0){
   data = stri1;  
  }
  eval( "data =" + data);
 }
 if ( type == "html" )
  jQuery("<p>").html(data).evalScripts();
 return data;
 },
 
 handleError: function( s, xml, status, e ) {
 // If a local callback was specified, fire it
 if ( s.error )
  s.error( xml, status, e );
 
 // Fire the global callback
 if ( s.global )
  jQuery.event.trigger( "ajaxError", [xml, s, e] );
 }
});

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