replace-jquery-ajax-with-vanila-js.MD

This code replaced jQuery's ajax with vanila js

// alpha JS request // no jQuery Copied from https://wordpress.stackexchange.com/a/301736/86978 https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send#Example_POST https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest

script.js

    // alpha JS request // no jQuery
    // https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send#Example_POST
    // https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
    var request = new XMLHttpRequest();

    request.open('POST', fpm_ajax.ajax_url, true);
    request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;');
    request.onload = function () {
        if (this.status >= 200 && this.status < 400) {
            // If successful
            console.log(this.response);
        } else {
            // If fail
            console.log(this.response);
        }
    };
    request.onerror = function() {
        // Connection error
    };
    request.send('action=work_hour_form_handler&work_hours_start=' + document.getElementById('work-hours--start').value + '&work_hours_end=' + document.getElementById('work-hours--end').value);
    //