igblive speakers async

da_people = [];

function httpGetAsync(url, callback) {
    let xmlHttp = new XMLHttpRequest();
    xmlHttp.onreadystatechange = function() {
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) callback(xmlHttp.responseText);
    };

    xmlHttp.open("GET", url, true); // true for asynchronous
    xmlHttp.send(null);
}

for(let i=1; i <=7; i++){
    let url = 'https://www.igblive.com/speakers-b0sa?&page=' + i + '&searchgroup=E00A724A-speakers'
    httpGetAsync(url, (page) => {
        let el = document.createElement( 'html' );
        el.innerHTML = page;

                da_nodes = el.getElementsByClassName('m-speakers-list__items__item__header');

for(let i = 0; i < da_nodes.length; i++){
      let rows = [
da_nodes[i].getElementsByClassName('m-speakers-list__items__item__header__title__link js-librarylink-entry').item(0),
da_nodes[i].getElementsByClassName('m-speakers-list__items__item__header__meta__position').item(0),
da_nodes[i].getElementsByClassName('m-speakers-list__items__item__header__meta__company').item(0)
];

fullName = rows[0] && rows[0].innerText.trim(),
position = rows[1] && rows[1].innerText.replace(',', '').trim(),
company = rows[2] && rows[2].innerText;


person = [fullName,position, company];

da_people.push(person.join(';'));
}



            });

        }