I want to add dynamic fields in monogDB

[saharajdeep]

//This is the javascipt Code which adds fields dynamically in front end.

var room = 1;
var temp=[];
// add dynamic fields
function add_education_fields() {
    temp.push(this.player);
   var marjor = $('#Major').val();
   var Schoolname = $('#Schoolname').val();
   var Degree = $('#Degree').val();
   var educationDate = $('#educationDate option:selected').val();
    room++;
   
    var parentDiv = document.getElementById('education_fields'); // point to the parent Div
    var childDiv = document.createElement("div"); // create child div on the fly
    childDiv.setAttribute("class", "form-group removeclass"+room); // add a dynamic class to the child div
    childDiv.innerHTML = '' +
    '<div class="row register-form">'+

        '<div class="col-sm-3 nopadding">' +
        '<div class="form-group">' +
        ' <input type="text" class="form-control" id="Schoolname" name="firstName" value="'+Schoolname+'" placeholder="First Name">' +
        '</div>' +
        '</div>' +
        '<div class="col-sm-3 nopadding">' +
        '<div class="form-group"> ' +
        '<input  type="text" class="form-control" id="Major" name="lastName" value="'+marjor+'" placeholder="Last Name">' +
        '</div>' +
        '</div>' +
        '<div class="col-sm-3 nopadding">' +
                '<div class="form-group">'+
    '<label id="Degree" for="validationDefault03">Madhyamik/HS result/Pass certificate</label>'+
' <input type="file" id="Degree" value="'+Degree +'" name="pic" accept="image/*" multiple required>'+
'</div>'+ 
        '</div>' +
        '<div class="col-sm-3 nopadding">' +
        '<div class="form-group">' +
        '<div class="input-group"> ' +
        '<div class="input-group-btn">' +
        ' <button class="btn btn-danger" type="button" onclick="remove_education_fields('+ room +');"> ' +
        '<span class="glyphicon glyphicon-minus" aria-hidden="true">-</span> ' +
        '</button>' +
        '</div></div></div>' +
        '</div>' +
        '<div class="clear"></div>'+
        '</div>'+
        '</div>';

    parentDiv.appendChild(childDiv); //  append or inject dynamic fields to the parent div
    temp.push(parentDiv);
    var StoredDiv = $('.removeclass'+room).html();
    manage_append(room,StoredDiv,'add'); //  store the dynamic fields to local storage
    $('#Major').val('');  // then reset all fields
    $('#Schoolname').val('');
    $('#Degree').val('');
  $('#educationDate').val(0);

  room.value();

}
// remove dynamic fields
function remove_education_fields(rid) {
    manage_append(rid,0,'delete');
    $('.removeclass'+rid).remove();
}
 // add and remove dynamic fields from local storage
function manage_append(room,html,action){
    if(action === 'add'){
        localStorage.setItem(room,html);//
    }else{
        localStorage.removeItem(room);
    }

}

// restore dynamic fields from local storage
(function () {
    for ( var i = 0, len = localStorage.length; i < len; ++i ) {
     $("#education_fields").append( localStorage.getItem( localStorage.key( i ) ) );
    }
});

 //This is my post request
router.post('/',  playerFile.single('pic'),(req,res)=>{
     if(req.body._id== '')
    insertRecord(req,res);   
     else
     updateRecord(req,res); 
});

function insertRecord(req, res) {
  console.log(req.body);
 
    var player = new Player();

    player.teamName = req.body.teamName;
    player.year = req.body.year;
    player.phoneNo = req.body.phoneNo;
    player.firstName = req.body.firstName;
    player.lastName = req.body.lastName;
    player.pic = req.file.filename;
    player.save((err, doc) => {
        if (!err)
            res.redirect('player/list');
        // else {
        //     if (err.name == 'ValidationError') {
        //         handleValidationError(err, req.body);
        //         res.render("player/addOrEdit", {
        //             viewTitle: "Insert Employee",
        //             player: req.body
        //         });
        //     }
            else
                console.log('Error during record insertion : ' + err);
        // }
    });

}


function updateRecord(req, res) {
    Player.findOneAndUpdate({ _id: req.body._id }, req.body, { new: true }, (err, doc) => {
        if (!err) { res.redirect('player/list'); }
        // else {
        //     if (err.name == 'ValidationError') {
        //         handleValidationError(err, req.body);
        //         res.render("employee/addOrEdit", {
        //             viewTitle: 'Update Employee',
        //             player: req.body
        //         });
        //     }
            else
                console.log('Error during record update : ' + err);
        // }
    });
}

I want to submit the fields 10 times and maximum 25 times.Anyting beyond that should give alert message.