node.js - Make a new prop in socket io object and get undefined using react.js as client -


i trying store data socket prop can reference later. however, on others socket.on comes out undefined

here code:

var userlist = ['dang huy','alice','bui sam', 'hai hai']; var onlineuser = [];  io.on('connection', socket => { socket.on('useronline', (data) => { //user alice go in     if(userlist.includes(data)){        onlineuser.push(data);        io.sockets.emit('onlineuser', onlineuser);     } socket.user_name = data; // store data user_name console.log(socket.user_name + ' online');  //logout alice online })  socket.on('usersendmessage', (data) => {     console.log(socket.user_name) // socket.user_name undefined here!!     console.log(data) // still log out message client side      io.sockets.emit('serversendmessage', 'hello')   })  socket.on('disconnect', function(){     onlineuser.splice(onlineuser.indexof(socket.user_name), 1)     io.sockets.emit('onlineuser', onlineuser)   })  })

what mean next event (could provides example?)oh notice wrong , won't never go event , purely normal, socket scope variable {} & ask out of them, move listeners up:

var userlist = ['dang huy','alice','bui sam', 'hai hai']; var onlineuser = [];   io.on('connection', socket => {   socket.on('useronline', (data) => { //user alice go in     if(userlist.includes(data)){        onlineuser.push(data);        io.sockets.emit('onlineuser', onlineuser);     }     socket.user_name = data; // store data user_name     console.log(socket.user_name + ' online');  //logout alice online   })   socket.on('usersendmessage', (data) => {     console.log(socket.user_name) // socket.user_name undefined here!!     console.log(data) // still log out message client side      io.sockets.emit('serversendmessage', 'hello')   })    socket.on('disconnect', function(){     onlineuser.splice(onlineuser.indexof(socket.user_name), 1)     io.sockets.emit('onlineuser', onlineuser)   }) })

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