How to open a modal window and pass the model to js

I learn modals and I have a problem.

I have a controller that has 1 method that should update or add a record. But I don’t know how to do it on js.

This is my main page

<!-- Modal placeholder --><div id="modal-placeholder"></div><!-- Button trigger modal --><button type="button" class="btn btn-primary" data-toggle="ajax-modal" id="modalButton">
    Add new pupil</button><h1>Index</h1><div id="Results"></div><table class="table"><thead><tr><th>
                @Html.DisplayNameFor(model => model.Name)</th><th>
                @Html.DisplayNameFor(model => model.Email)</th><th></th></tr></thead><tbody>
        @foreach (var item in Model)
        {<tr><td>
                    @Html.DisplayFor(modelItem => item.Name)</td><td>
                    @Html.DisplayFor(modelItem => item.Email)</td><td><a asp-action="Edit" asp-route-id="@item.Id">Edit</a> |<a asp-action="Details" asp-route-id="@item.Id">Details</a> |<form asp-action="Delete" asp-route-id="@item.Id" onsubmit="return jQueryAjaxDelete(this)" class="d-inline"><input type="submit" value="Delete" class="btn btn-danger" /></form></td></tr>
        }</tbody></table>

Then i click to the button and i want to open partialView in modal window.

My model is simple

public class Pupils
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Email { get; set; }
}

i try 

getPupils = (url, title) => {$.ajax({
        type: 'GET',
        url: url,
        success: function (res) {$('#form-modal .modal-body').html(res);$('#form-modal .modal-title').html(title);$('#form-modal').modal('show');
        }
    })
};

const patentBox = $('#Results');
const modalButton = $('#modalButton');

modalButton.on('click', function () {
    debugger;
        $.ajax({
            url: 'Pupils/AddOrEdit/',
            type: "GET",
            success: function(content){
                patentBox.html(content);
                },
        error: function (data) {
        console.error(data.responseText);
        toastr.error('Error', '!!!');
    } });
})


editPupil = form => {
    try {$.ajax({
            type: 'POST',
            url: form.action,
            data: new FormData(form),
            contentType: false,
            processData: false,
            success: function (res) {
                if (res.isValid) {$('#view-all').html(res.html)$('#form-modal .modal-body').html('');$('#form-modal .modal-title').html('');$.notify('submitted successfully', { globalPosition: 'top center', className: 'success' });$('#form-modal').modal('hide');
                }
                else$('#form-modal .modal-body').html(res.html);
            },
            error: function (err) {
                console.log(err);
            }
        });
    } catch (ex) {
        console.log(ex);
    }
    return false;
};$(function () {$("#loaderbody").addClass('hide');$(document).bind('ajaxStart', function () {$("#loaderbody").removeClass('hide');
    }).bind('ajaxStop', function () {$("#loaderbody").addClass('hide');
    });
});

partialView

@model Models.Pupils

@{
    ViewData["Title"] = "Index";
}<div class="modal bd-example-modal-lg" tabindex="-1" role="dialog" id="form-modal"><div class="modal-dialog" role="document"><div class="modal-content"><div class="modal-header"><h5 class="modal-title"></h5><button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button></div><div class="modal-body"><div class="row"><div class="col-md-12"><form asp-action="AddOrEdit" asp-route-id="@Model.Id" onsubmit="return editPupil(this);" autocomplete="off"><div asp-validation-summary="ModelOnly" class="text-danger"></div><input type="hidden" asp-for="Id" /><div class="col-md-8 order-md-1"><div class="row"><div class="mb-3"><label for="address">Pupil name</label><label asp-for="Name" class="control-label"></label><input type="text" asp-for="Name" class="form-control" id="Name" placeholder=""><span asp-validation-for="Name" class="text-danger"></span><div class="invalid-feedback">
                                            Please enter valid name.</div></div><div class="col-md-6"><div class="form-group"><label asp-for="Email" class="control-label"></label><input asp-for="Email" class="form-control" /><span asp-validation-for="Email" class="text-danger"></span></div></div><div class="form-group"><div class="col-md-6 offset-md-3"><input type="submit" value="Submit" class="btn btn-primary btn-block" /></div></div></div></form></div></div></div></div></div></div><div class="loaderbody" id="loaderbody"><div class="loader"></div></div>

Now Modal open but and have style display:none, dont want close and i dont know how pass to ajax my model