How to keep current url including parameters in JavaScript

I am using the modal to edit data by using the code below, and when I click the ‘Change’ button,
I want to keep the current url. Even when I set a parameter, I don’t want me to lose the parameter.

This url has no parameters set. So, if I edit data in modal and click the ‘change’ button, I lose all the parameters I set and return to the initialized screen.

I am using Django and python, and I am getting parameter values ​​through request.POST.get method in views.py .

function (data, status, xhr) {
            let code = data.code
            if (code === 'error') {
                for (let i in fields) {
                    let key = fields[i];
                    let labelElement = editForm.find('label[for=' + key + ']');
                    let container = labelElement.parent();

                    if (key in data.error) {
                        container.addClass('card-inverse-danger');
                        const msg = data.error[key][0];
                        let text = $('<div class="text-danger small" style="line-height: 1rem;">' + msg + '</div>')
                        labelElement.find('.text-danger').remove();
                        labelElement.append(text);
                    } else {
                        container.removeClass('card-inverse-danger');
                        labelElement.find('.text-danger').remove();
                    }
                }
            } else if (code === 'success') {
                window.location.href = '/study/help/'; --> I think I need to update this line.
            }
        })