Node.js，为事件“数据”分配回调函数

Question

How can I assign a call back function for event 'data' and give it more then 1 standard parameter ? Here is my script :

var http = require('http');
var server = http.createServer().listen(8080);

server.on('request', onRequest);
server.on('listening', onListening);

function onRequest(request, response)
{
    response.writeHead(200);
    request.on('data', function(){onReqData(data,res)});
    request.on('end', onReqEnd);
}

function onReqData(data, response)
{
    console.log('Request : ', data.toString());
    response.write('Write : ' + data.toString());
}

function listen()
{
    console.log('--- / Server runs on 8080 / --- ');
} 

function onReqEnd()
{
    console.log(' - - - / The end of request / - - - ');
}

I don't like the syntax where the body of the callback function is in the .on() block.
So when I'm trying to assign a callback like this : request.on('data', onReqData); without declaring function incoming params ( function onReqData(){...} ) I have an error which tells me that response is undefined

request.on('data', function(){onReqData(data,res)});

Gives me an error that data is undefined.

Any help will be greatly appreciated !

Answer 1

The 'data' event will call your function passing a chunk of data. You need to accept chunk as a function parameter and pass it on to your onReqData function.

Edit: You also need to pass the same response variable to onReqData.

function onRequest(request, response)
{
    response.writeHead(200);
    request.on('data', function(chunk){onReqData(chunk, response)});
    request.on('end', onReqEnd);
}