AJAX call example

ajax.js

function makeAjaxCall(url, methodType, callback){
 return $.ajax({
    url : url,
    method : methodType,
    dataType : "json"
 })
}
let data = serializeForm(document.getElementById('form_pv'));
makeAjaxCall(urlCreatePV, data, 'POST').then(function(respJson){
    if (respJson.ok == false)
        return;
    console.log(respJson);
    $('#dialog_form_pv').modal('hide');
    // inserting into select2
    let pvName = $('#id_pv-cproduct').select2('data')[0].text + ' - ' + document.getElementById('id_pv-name').value;
    let data = {
        id: respJson.pk,
        text: pvName
    };
    let newOption = new Option(data.text, data.id, true, true);
    $('#id_product_variant').append(newOption).trigger('change');

}, function(reason){
    console.log("error in processing your request", reason);
    errors = reason.responseJSON;
    for (let field in errors){
        let element = document.getElementById('id_pv-' + field);
        element.className += ' error-input';
        element.closest('.form-group').className += ' has-error';
        element.parentNode.querySelector('.error-block').innerHTML = errors[field][0];
    }
});