Training Guide: Programming in HTML5 with JavaScript and CSS3 Ebook

376 CHAPTER 8 Websites and services

var y = $('#y').val();

var data = { "x": x, "y": y };

$.post('/subtraction', data, function (data) {

$('#result').html(data.result);

}, 'json');

}

function multiplyNumbers() {

var x = $('#x').val();

var y = $('#y').val();

var data = { "x": x, "y": y };

$.ajax({

url: '/multiply',

data: data,

type: 'PUT',

dataType: 'json',

cache: false,

success: function (data) {

$('#result').html(data.result);

}

});

}

function divideNumbers() {

var x = $('#x').val();

var y = $('#y').val();

var data = { "x": x, "y": y };

$.ajax({

url: '/divide',

data: data,

type: 'DELETE',

dataType: 'json',

cache: false,

success: function (data) {

$('#result').html(data.result);

}

});

}

The following is the completed app.js file that shows the routing for the subtraction, multi-

ply, and divide requests.

var express = require('express');

var app = express();

var formidable = require('formidable');

var math = require('math_example');

app.use(express.static(__dirname + '/public'));

app.get('/addition', function (request, response) {

var x = Number(request.query.x),

y = Number(request.query.y),

result = math.addition(x, y);

response.writeHead(200, { 'Content-Type': 'application/json' });