Question

我正在尝试使用强大的内容上传文件，遵循Node Beginner Book中的教程。在这段代码之后，我有一个服务器模块将request对象传递给requestHandler模块。主页面使用以下处理程序加载表单：

function start(response) {
    console.log("Request handler 'start' was called.");

    var body = '<html>'+
        '<head>'+
        '<meta http-equiv="Content-Type" content="text/html"; '+
        'charset=UTF-8" />'+
        '</head>'+
        '<body>'+
        '<form action="/upload" enctype="multipart/form-data method="post">'+
        '<input type="file" name="upload" multiple="multiple"'+
        '<input type="submit" value="Upload file" />'+
        '</form>'+
        '</body>'+
        '</html>';

    response.writeHead(200, {"Content-Type": "text/html"});
    response.write(body);
    response.end();

}

提交表单时，/ upload路径会触发以下上传处理函数：

function upload(response,request) {
    console.log("Request handler 'upload' was called.");

    var form = new formidable.IncomingForm();
    console.log("about to parse");
    form.parse(request, function(error, fields, files) {
        console.log("parsing done");

        console.log(util.inspect({error: error, fields: fields, files: files}));

        fs.rename(files.upload.path, "/tmp/test.png", function(error) {
            if (error) {
                console.log(error);
                fs.unlink("/tmp/test.png");
                fs.rename(files.upload.path, "/tmp/test.png");
            }
        });
        response.writeHead(200, {"Content-Type": "text/html"});
        response.write("received image:<br/>");
        response.write("<img src='/show' />");
        reponse.end();
    });

}

但是，单击上传按钮时，服务器崩溃时出现以下错误：

/home/****/Coding/nodebeginner/requestHandlers.js:38
        fs.rename(files.upload.path, "/tmp/test.png", function(erro
                              ^
TypeError: Cannot read property 'path' of undefined
    at /home/****/Coding/nodebeginner/requestHandlers.js:38:25
    at IncomingForm.<anonymous> (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:104:9)
    at IncomingForm.EventEmitter.emit (events.js:92:17)
    at IncomingForm._maybeEnd (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:551:8)
    at Object.end (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:238:12)
    at IncomingMessage.<anonymous> (/home/****/Coding/nodebeginner/node_modules/formidable/lib/incoming_form.js:129:30)
    at IncomingMessage.EventEmitter.emit (events.js:92:17)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

显然files变量未定义。我认为可能存在错误，但error变量未设置为null。所以我在这里有点难过。想法？

Answer 1

我有同样的问题。我想你会在本书末尾的Node Beginner Book上看到这些行代码。我通过删除server.js文件中的以下代码来修复它：

//      req.setEncoding("utf8");
//        req.addListener("data", function(postDataChunk) {
//            postData += postDataChunk;
//        });
//        req.addListener("end", function() {
//            route(handle, pathname, res, req);
//        });

Just do:

route（handle，pathname，res，req）;

And last, you must be careful at html form tags.

Sorry for my English and best wishes!

***VinRover Nguyen***

Answer 2

我也有同样的问题。您的表单标记缺少enctype属性的结束双引号（＆＃34;）。

Answer 3

我遇到了同样的问题。听起来像上传类已被替换或拼写错误。尝试将files.upload.path中的引用更改为files.Upload.path。它在这里工作。查看主分支以获取更多信息：Git

Answer 4

看起来你的“var body”中有一些错误。试试：

var body = '<html>' +
  '<head>' +
  '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />' +
  '</head>' +
  '<body>' +
  '<form action="/upload" enctype="multipart/form-data" method="post">' +
  '<input type="file" name="upload" multiple="multiple">' +
  '<input type="submit" value="Upload File">' +
  '</form>' +
  '</bidy>' +
  '</html>';

Answer 5

form.parse中的回调参数名称有错误。

Node Beginner Book将代码显示为：

form.parse(request, function(error, fields, files) {
    //code
}

回调函数中的参数不应为复数：

form.parse(request, function(error, field, file) {
    //code
}

查看/node_modlues/formidable/lib/incoming_form.js中的IncomingForm.prototype.parse。回调是在听单数＆＃34;字段＆＃34;和＆＃34;文件＆＃34;

强大的上传不工作：＆＃39;文件＆＃34;未定义，没有错误

5 个答案: