在我的node.js/Express.js应用程序中,我需要使用socket.io连接传递参数(在另一篇文章中看到).
在客户端,我有类似的东西:
编辑
var socket = io.connect('/image/change', {query:"name=my_img_name"}); var siofu = new SocketIOFileUpload(socket); siofu.listenOnInput(document.getElementById("change_image_inpt"));
在服务器端:
编辑
io.of('/image/change') .on('connection', function (socket) { console.log('log input param : ' + socket.handshake.query.name); });
但是在控制台中什么都没有
还有另一种方法可以实现吗?
EDIT2
这是客户端的完整代码:
$(document).ready(function() { // icon_action_modal $('.icon_actions').on('click', function() { // set icon preview $('#icon_action_modal_icon_preview').html(''); // set icon to delete $('#icon_name').val($(this).data('icon')); // set Change icon socket var socket = io.connect('/icon_sets/change', {query:"name=my_img_name"}); var siofu = new SocketIOFileUpload(socket); siofu.listenOnInput(document.getElementById("change_icon")); // Do something when a file is uploaded siofu.addEventListener("complete", function () { $('.overlay').hide(); }); // display loader window socket.on('displayOverlay', displayOverlay); // display socket.on('displayIconImage', function (data) { $('#iconset_render').append('
'); }); socket.on('setIconsetArray', function (data) { var iconset = ($('#iconset_array').val()) ? JSON.parse($('#iconset_array').val()) : []; iconset.push(data.iconName); $('#iconset_array').val(JSON.stringify(iconset)); deleteIcon($('#icon_name').val()); // close modal $('#icon_action_modal').modal('hide'); }); }); $('#icon_action_modal_delete_icon').on('click', function() { deleteIcon($('#icon_name').val()); // close modal $('#icon_action_modal').modal('hide'); }); }); // end document.ready
以及服务器端的完整代码:
io.of('/icon_sets/change') .on('connection', function (socket) { console.log('log input param : ' + socket.handshake.query.name); functions.socketImageTransfer(socket, 'icon', 65, 65); });
具有以下socketImageTransfer
功能:
module.exports.socketImageTransfer = function(socket, type, width, height, name) { var socketioFileUploadServer = require('socketio-file-upload'); // upload files by socket var config = require(__dirname + '/config/config.json'); var easyimg = require('easyimage'); // crop - resize image var fs = require('fs'); // file system access // Make an instance of socketioFileUploadServer and listen on this socket: var uploader = new socketioFileUploadServer(); uploader.dir = config.tmpDir; uploader.listen(socket); // Do something when a file is saved: uploader.on('saved', function (event) { console.log('Original ' + type + ' saved'); // resize and rename image with a unique id var newName; if (!name) { newName = Math.random().toString(36).substr(2, 9) + '_' + type + '.png'; } else { newName = name; } var fileName = event.file.name.replace(/ /g, '_'); easyimg.rescrop({src: config.tmpDir + fileName, dst: config.uploadDir + type + '/' + newName, width: width, height: height}, function (err, image) { if (err) return console.log(err); console.log(type + ' resized and cropped: ' + image.width + ' x ' + image.height); // image is uploaded - resized - croped, now display it socket.emit('display' + ucfirst(type) + 'Image', {path: '/upload/'+ type + '/' + newName}); // remove original from file system fs.unlink(config.tmpDir + fileName, function () { if (err) throw err; console.log('Original ' + type + ' removed'); }); // additionnal action switch(type) { case 'icon': // send path to generate iconset_json socket.emit('setIconsetArray', {iconName: newName}); break; } }); }); uploader.on('start', function (event) { console.log('Client start upload'); socket.emit('displayOverlay'); }); // Error handler: uploader.on('error', function (event) { console.log("Error from uploader", event); }); };
感谢您的帮助
就在这里.
1)query
是一样GET
的参数,所以更换"param:value"
用"param=value"
(如果你想传递多个参数,做它,你通常做网址:param=value&some_other_param=test
)
2)有一个更简单,更可靠(因为没有访问handshaken
对象的未定义属性的风险)的方式来获取connection
处理程序内的查询参数:
console.log(socket.handshake.query.param);
编辑:
在学习完整代码后,我想我找出了导致问题的原因.问题是你可能误解了Socket.IO命名空间的主要思想.
我猜你io.connect
在一个页面内有多个Socket.IO连接(调用),对吗?通常单个连接就足够了.你的错误是你打电话io.connect
给鼠标事件,但是你应该打电话一次document.ready
,然后再打电话emit
.
看一下下面的代码(客户端):
$(document).ready(function() { var socket = io.connect('', {query: 'name=something'}); // [...] socket.on('some_event_from_server', function(data, cb) {}); // [...] $('#someButton').click(function() { socket.emit('markers_add', {some: 'data'}); //send `markers_add` message to server within main namespace }); $('#someOtherButton').click(function() { socket.emit('icon_sets_add', {some: 'thing'}, function(response) { //server may response to this request. see server side code below }); }); });
服务器端代码:
io.on('connection', function(socket) { //connection handler of main namespace socket.on('markers_add', function(data) { /* ... */ }); socket.on('icon_sets_add', function(data, cb) { // do something cb({some: 'response'}); }); // [...] socket.emit('some_event_from_server', {}); //server sends a message to a client //BTW, now it should be OK: console.log(socket.handshake.query.name); });
如果你有一个命名空间,它应该工作.我实际上不知道它是否是Socket.IO的错误或者是由于命名空间的使用不当造成的,但修改代码只能创建一个命名空间应该可以解决问题.因此,在您的情况下,您根本不必在握手时传递查询参数.实际上,如果您想让您的应用更安全,您必须使用查询参数.请参阅http://wlkns.co/node-js/socket-io-authentication-tutorial-server-and-client/(对于Socket.io 0.9)
希望我的回答可以帮到你.祝好运!
这就是我所做的.
客户
var socket = io.connect('http://localhost:8890',{ query: "foo=bar" });
服务器
io.on('connection', function (socket) { console.log(socket.handshake.query['foo']); });