「5-4」FastDFS+filebox+ajaxFileUpload实现商品图片上传

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在 5-3 小节的时候，我们已经实现了对商品分类的获取展示，那么接下来就要将商品图片上传到我们的存储服务器，然后把商品的图片地址存放到我们的数据库里面。

我们已经搭建好了Java文件服务器FastDFS了，而且我们也可以写了上传图片的接口，那么接下来就可以使用 ajaxFileUpload 来上传我们的商品图片。

ajaxFileUpload的源码如下：

// JavaScript Document
jQuery.extend({

    createUploadIframe: function(id, uri)
    {
        //create frame
        var frameId = 'jUploadFrame' + id;

        if(window.ActiveXObject) {
            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)
    {
        //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 = s.fileElementId;
        var form = jQuery.createUploadForm(id, s.fileElementId);
        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", [xml, s] );
                        };
                    } else
                    {
                        jQuery.handleError(s, xml, status);
                    }

                } catch(e)
                {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                };
                if( s.global )
                {
                    // The request was completed
                    jQuery.event.trigger( "ajaxComplete", [xml, 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, xml, null, 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, xml, null, 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, 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] );
        }
    }
});

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