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app.js
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app.js
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var express = require('express');
var app = express();
const CXT_ROOT = 'mathe/';
const TYPES = ['addition', 'multiplication', 'subtraction', 'division'];
const RANGES = {
'addition': [10, 75],
'multiplication': [1, 10]
};
const OPERATION_MAPPING = {
'addition': ['addition', true],
'multiplication': ['multiplication', true],
'subtraction': ['addition', false],
'division': ['multiplication', false],
}
var GAP_POSITIONS = [2];
app.get('/' + CXT_ROOT, function (req, res) {
var body =
'<html>\n' +
'<head>\n' +
'<title>Mathe-Training</title>\n' +
'<style type="text/css">\n' +
'</style>\n' +
'</head>\n' +
'<body>\n' +
'<form method="get" action="/' + CXT_ROOT + 'blatt">\n' +
'<table>\n' +
'<tr>\n' +
'<td valign="top">Rechenarten:</td>\n' +
'<td>' +
'<label><input type="checkbox" name="t" value="addition" checked>+ Addition</label><br/>\n' +
'<label><input type="checkbox" name="t" value="multiplication" checked>* Multiplikation</label><br/>\n' +
'<label><input type="checkbox" name="t" value="subtraction">- Subtraktion</label><br/>\n' +
'<label><input type="checkbox" name="t" value="division">: Division</label><br/>\n' +
'</td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td>Zu berechnende Position:</td>\n' +
'<td><input type="checkbox" name="g" value="0"/> + <input type="checkbox" name="g" value="1"/> = <input type="checkbox" name="g" value="2" checked/></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td colspan="2">Summanden von <input type="text" name="s1" value="10" size="2"/> bis <input type="text" name="s2" value="75" size="2"/></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td colspan="2">Faktoren von <input type="text" name="f1" value="2" size="2"/> bis <input type="text" name="f2" value="10" size="2"/></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td>Aufgaben je Türmchen:</td>\n' +
'<td><input type="text" name="ss" value="7" size="2"></input></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td>Reihen:</td>\n' +
'<td><input type="text" name="r" value="3" size="2"></input></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td>Spalten:</td>\n' +
'<td><input type="text" name="c" value="3" size="2"></input></td>\n' +
'</tr>\n' +
'<tr>\n' +
'<td></td>\n' +
'<td><input type="submit" value="Generieren"></input></td>\n' +
'</tr>\n' +
'</table>\n'
'</form>\n'
'</body>\n' +
'</html>\n';
res.send(body);
});
app.get('/' + CXT_ROOT + 'blatt', function (req, res) {
var body =
'<html>' +
'<head>' +
'<title>Arbeitsblatt</title>' +
'<style type="text/css">' +
'table {\n' +
'font-family: Arial, sans-serif;\n' +
// 'font-size: large;\n' +
'}\n' +
'table.sheet {\n' +
'width: 100%;\n' +
'}\n' +
'table.set {\n' +
'width: 33%;\n' +
'margin: 30px;\n' +
'}\n' +
'table.set tr td {\n' +
'padding: 5px;\n' +
// 'padding-top: 10px;\n' +
// 'padding-bottom: 10px;\n' +
// 'padding-left: 5px;\n' +
// 'padding-right: 5px;\n' +
'vertical-align: middle;\n' +
'height: 100%;\n' +
'}\n' +
'td.gap {\n' +
'border: solid 1px black;\n' +
'}\n' +
'</style>' +
'</head>' +
'<body>';
var setSize = 7;
if ('ss' in req.query) {
setSize = validateParams(parseInt(req.query.ss), 0, 50);
}
var columns = 3;
if ('c' in req.query) {
columns = validateParams(parseInt(req.query.c), 0, 10);
}
var rows = 3;
if ('r' in req.query) {
rows = validateParams(parseInt(req.query.r), 0, 50);
}
var type = [TYPES[0], TYPES[1]];
if ('t' in req.query) {
if (Array.isArray(req.query.t)) {
type = req.query.t;
}
else {
type = [req.query.t];
}
}
var factorRangeLow = 1;
if ('f1' in req.query) {
factorRangeLow = validateParams(parseInt(req.query.f1), 0, 100);
}
var factorRangeHigh = 10;
if ('f2' in req.query) {
factorRangeHigh = validateParams(parseInt(req.query.f2), factorRangeLow, 1000);
}
RANGES[TYPES[1]] = [factorRangeLow, factorRangeHigh];
var summandRangeLow = 10;
if ('s1' in req.query) {
summandRangeLow = validateParams(parseInt(req.query.s1), 0, 100);
}
var summandRangeHigh = 75;
if ('s2' in req.query) {
summandRangeHigh = validateParams(parseInt(req.query.s2), summandRangeLow, 1000);
}
RANGES[TYPES[0]] = [summandRangeLow, summandRangeHigh];
if ('g' in req.query) {
if (Array.isArray(req.query.g)) {
GAP_POSITIONS = req.query.g.map(x => parseInt(x));
}
else {
GAP_POSITIONS = [validateParams(parseInt(req.query.g), 0, 2)]
}
}
body += getMathExercises(setSize, columns, rows, type);
body += '</body></html>';
res.send(body);
});
app.listen(3000, function () {
console.log('App listening on port 3000!');
});
function getMathExercises(setSize = 5, columns = 3, rows = 5, type) {
var out = '<table class="sheet">';
for (r = 0; r < rows; r++) {
out += '<tr>';
for (c = 0; c < columns; c++) {
out += '<td>' + getExerciseSet(setSize, type) + '</td>';
}
out += '</tr>';
}
out += '</table>'
return out;
}
function getExerciseSet(size = 5, type) {
currentType = type[Math.floor(Math.random() * type.length)];
// console.log(currentType, forward);
var exercises = '<table class="set">';
for (i = 0; i < size; i++) {
exercises += getExerciseRow(OPERATION_MAPPING[currentType][0], OPERATION_MAPPING[currentType][1]);
}
exercises += '</table>';
return exercises;
}
function getExerciseRow(type, forward = true) {
var range = RANGES[type];
// console.log(JSON.stringify(range));
const exercise = getExercise(range, type, forward);
var gap = GAP_POSITIONS[Math.floor(Math.random() * GAP_POSITIONS.length)];
var row = '<tr>';
for (j = 0; j < exercise.length; j++) {
row += '<td' + (2*gap === j ? ' class="gap"> ' : ('>' + exercise[j])) + '</td>';
}
row += '</tr>';
return row;
}
function getExercise(range, type = 'addition', forward = true) {
var operator = '';
var number1 = Math.floor(Math.random() * (range[1] - range[0] + 1)) + range[0];
var number2 = Math.floor(Math.random() * (range[1] - range[0] + 1)) + range[0];
var result = 0;
switch(type) {
case TYPES[1]:
if (forward) {
operator = '*';
}
else {
operator = ':';
}
result = number1 * number2;
break;
case TYPES[0]:
if (forward) {
operator = '+';
}
else {
operator = '-';
}
result = number1 + number2;
break;
}
var exercise;
if (forward) {
exercise = [number1, operator, number2, '=', result];
}
else {
exercise = [result, operator, number1, '=', number2];
}
return exercise;
}
function validateParams(param, low, high) {
if (param < low) {
param = low;
}
else if (param > high) {
param = high;
}
return param;
}