how to get horseman work synchronous

[heboyuan]

I'm trying to fetch things from another website with horseman, and then use it in my own web. However, my own res.send always triggers before horseman has collected data.

var Horseman = require('node-horseman');
var express = require("express");

var app = express();

var ProfName = 'Stahl';
var URL = "http://www.bruinwalk.com/search/?q=" + ProfName;


function getProf(callback){
    var result = {com:"default", rat:"default"};
    var horseman = new Horseman();
    horseman.open(URL)
        .evaluate(function(selector){
            var els = $(selector);
            $.each(els, function(i, el) {
                var event = document.createEvent('MouseEvent');
                event.initEvent('click', true, true);
                el.dispatchEvent(event);
            });
        }, 'h1:eq(3)')
        .delay(1000)
        .evaluate(function(selector){
            var els = $(selector);
            $.each(els, function(i, el) {
                var event = document.createEvent('MouseEvent');
                event.initEvent('click', true, true);
                el.dispatchEvent(event);
            });
        }, "div:contains('COM SCI 31')")
        .delay(1000)
        .screenshot('test1.png')
        .text('.metric')
        .then(function(text){
            result.com = text;   
        })
        .text('.expand-area>p')
        .then(function(text){
            result.rat = text;   
        })
        .close();
    callback(result.rat,result.com);
}

app.get("/",function(req,res){
    getProf(function(comments, rating){
        console.log(comments);
        console.log(rating);
        res.send('success');
    });
});

this gives me

default
default