Create custom event in plain JS. Supports modern browsers (IE11+)

customevents.js

// IE >= 11
function triggerEvent(el, eventName, options) {
    var event,
        opts = {detail: options};

    event = newEvent(eventName, opts);
    el.dispatchEvent(event);
}

function newEvent(eventName, options) {
    var opts = {detail: options};
    try { // catch IE 11
        return new CustomEvent(eventName, opts); // Modern browsers be like..
    } catch (e) {
        var event = document.createEvent('CustomEvent'); // IE ruining the party..
        event.initCustomEvent(eventName, true, true, opts);
        return event;
    }
}