javascript - Socket.io is not defined -

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whenever go http://localhost:8080/search (search.html), loads of html, reaches client-side javascript , crashes. first console.log in searchclient.js works, not second. error io not defined.

server.js:

var http = require('http'); var express = require('express'); var anydb = require('any-db'); var engines = require('consolidate');   var app = express(); var server = http.createserver(app); var io = require('socket.io').listen(server); var conn = anydb.createconnection('sqlite3://riverdata.db');  app.engine('html', engines.hogan); app.set('views', __dirname + '/templates'); app.use(express.static(__dirname + '/public'));  app.get("/", function(request, response){      response.render('home.html');  }); app.get("/search", function(request, response){     response.render('search.html'); });   io.on('connection', function(socket){     socket.on('join', function(){      });     socket.on('search', function(toshowlist, conditionslist){         var data = conn.query('select toshowlist riverdata conditionslist');         console.log("im in socket.on(search)");         socket.emit('data', data);     });     socket.on('disconnect', function(){      });  });   app.listen(8080);

searchclient.js:

console.log("begins"); var socket = io.connect(); console.log("keeps running");   window.addeventlistener('load', function(){     console.log("page loads");     var search = document.getelementbyid("searchbutton");     submit.addeventlistener("click", search, false);     socket.emit('join');      socket.on('data', function(data){         console.log(data);     })  }, false);  function search(){     console.log("button clicked");     var toshowlist = [];     var conditionslist = [];      socket.emit('search', toshowlist, conditionslist); }

search.html:

<!doctype html public> <html lang="en">  <head>     <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>      <script src='localhost:8080/socket.io/socket.io.js'></script>     <script type="text/javascript" src="/searchclient.js"></script>     <title>envirostats database</title>     <link rel="stylesheet" href="/style.css" type="text/css" /> </head>  <body class="search">     <form action="">     <input type="checkbox" name="data" value="data"> show date <br>     <input type="checkbox" name="data" value="river"> show river <br>     </form>     <button id=searchbutton> search </button> </body>  </html>


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