I have been developing thesis software that involves retrieving variables within closures.
Below is the code snippet written in node.js:
var kepala = express.basicAuth(authentikasi);
// authentication for login
function authentikasi(user, pass, callback) {
// declare MongoDB database
db.collection('ak_teacher', function (err, data) {
data.findOne({
'tch_name': {
'$regex': user
}
}, function (err, level) {
console.log(level); // monitor data
if (level == null) {
console.log('Headmaster's database value entered as Null, please retry login');
callback(null);
} else {
var a = level.tch_name;
var b = level.tch_password;
var c = level.sch_id; // (need this variable for next code)
var result = (user === a && pass === b);
console.log("School ID : " + c);
callback(null /* error */ , result);
}
});
});
};
var tes = authentikasi(); // (I am unsure how to declare to retrieve my variable c)
app.get('/siswa_2', kepala, function (req, res) {
// using variable here
var sch_id = tes;
console.log("School ID in query: " + sch_id);
console.log('Displaying all student data');
db.collection('ak_student', function (err, collection) {
collection.find({
"sch_id": sch_id
}).toArray(function (err, items) {
console.log(items);
res.send(items);
});
});
});
I am attempting to access the variable c.