1. 程式人生 > >ajaxfileupload.js問題彙總及解決 附修復版下載

ajaxfileupload.js問題彙總及解決 附修復版下載

使用Jquery做上傳檔案處理時,用到了ajaxfileupload.js 這個第三方程式碼,但是這個js幾乎就是半成品,問題很多。現在整理如下並附修復版的ajaxfileupload.js下載。

問題:
1:無法帶引數提交,只能上傳檔案;
2:執行時報:jQuery.handleError is not a function 錯誤;
3:執行成功後,始終指向error方法處理,無法執行sucess方法;

解決方法:
1:無法帶引數提交,只能上傳檔案;
原作者一定是把這個程式碼當作練習來寫的,只完成了檔案提交這個功能。需要對程式碼做些許修改即可。有兩處修改:
第一處是將原createUploadForm: function(id, fileElementId) 方法新增一個data引數,並將data中的資料拼接進去即可。程式碼如下:

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);
 
    // 增加引數的支援
    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;
},

第二處 是呼叫createUploadForm方法地方,如下所示:
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();
    
   // 修改為呼叫新增引數的方法
   // var form = jQuery.createUploadForm(id, s.fileElementId);
   var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
    
   var io = jQuery.createUploadIframe(id, s.secureuri);

2:執行時報:jQuery.handleError is not a function 錯誤;
這個錯誤是由於ajaxfileupload.js 是在jquery1.4.2版本之前寫的,Jquery之後的版本已經沒有了handleError 方法,所以可以將1.4.2版本中的該方法複製到該js中。
handleError: 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] );
    }
},
3:執行成功後,始終指向error方法處理,無法執行sucess方法;
這個是由於ajaxfileupload.js 處理返回data的時候,沒有考慮後臺返回的是字串的問題(即使返回的JSON格式資料,我們也大多喜歡轉化為字串來返回)。修改uploadHttpData方法:
// Get the JavaScript object, if JSON is used.
if ( type == "json" ){
    // 如果返回的是字串(JSON格式字串),下面會報錯,導致無法走入sucess方法 加上"
    // eval( "data = " + data );
    eval("data = " "+data+" " ");
}

修復版ajaxfileupload.js 
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)
	{
		//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);
		//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);
		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)
                        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 () {}};	

    },

	// handleError 方法在jquery1.4.2之後移除了,此處重寫改方法
	handleError: 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] );
		}
	},

    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;
    }
});