Having Problems Getting New Array Value After Looping In Nodejs

As i am new to NodeJS, I have tried several methods such as using async/await on my functions but when i try to print out the array retrieveValues it always seems to be empty. Even

Solution 1:

That last console.log runs before pushing. You are passing function as a callback, so it will run after the operation ends. I cleaned your code a little bit and moved the console.log.

router.post('/api/retrievefornotifications', (request, response) => {
var requestBody = request.body;
var responseCode;
var teacher = requestBody.teacher;
var notification = requestBody.notification;

var emails = helper.findEmailAddresses(notification);

console.log(emails);

var retrieveValues = {
    recipients: []
};

    con.query('SELECT COUNT(*) as count_value FROM school.schoolinformation WHERE email = ? AND user_status = ?', [dataElement, 1], function (err, result, fields) {
        if (!err) {
            var suspended = result[0].count_value;
            if (suspended == 0) {
                console.log("pushing %s", dataElement);
                retrieveValues.recipients.push(dataElement);
            }
            else {
                responseCode = 500;
                helper.writeResponse(responseCode, response, 0);
            }
        }
        else {
            responseCode = 204;
            helper.writeResponse(responseCode, response, 0);
        }
        console.log(retrieveValues);
        response.end();
    });

})

Solution 2:

Maybe you can try this code below:

router.post('/api/retrievefornotifications', (request, response) => {
    var requestBody = request.body;
    var responseCode;
    var teacher = requestBody.teacher;
    var notification = requestBody.notification;

    var emails = helper.findEmailAddresses(notification);

    console.log(emails);

    var retrieveValues = {
        recipients: []
    };

      const result = newPromise((resolve, reject) => {  con.query('SELECT COUNT(*) as count_value FROM school.schoolinformation WHERE email = ? AND user_status = ?', [dataElement, 1], function (err, result, fields) {
        // con.query('SELECT COUNT(*) as count_value FROM school.schoolinformation WHERE email = ? AND user_status = ?; SELECT COUNT(*) as count_value2 FROM school.registration_relationship WHERE teacher_email = ? AND student_email = ?', [dataElement, 1, teacher, dataElement], function (err, result, fields) {// console.log("dataElements %s", dataElement);if (!err) {
                // console.log("Count value 1: %s",result[0][0].count_value);// console.log("Count value 2: %s",result[1][0].count_value2);// var suspended = result[0][0].count_value;// var registerWithTeacher = result[1][0].count_value;// console.log(result);var suspended = result[0].count_value;
                // Does such an email exist? (0 - NOT SUSPENDED, 1 - SUSPENDED) - suspended// If 1 means it is a registered pair - registerWithTeacher// has been mentioned in notification// Is registered with the teacherif (suspended == 0) {
                    console.log("pushing %s", dataElement);
                    resolve(dataElement);
                }
                else {
                    responseCode = 500;
                    helper.writeResponse(responseCode, response, 0);
                }
            }
            else {
                responseCode = 204;
                helper.writeResponse(responseCode, response, 0);
            }
        });

    // do some stuff hereconsole.log(await result);

    retrieveValues.recipients.push(await result);
    console.log(retrieveValues);
    response.end();

});

});

I hope it can help you.