dom-delegator/add-event.js

Decorate elements with delegated events

var EvStore = require("ev-store")

module.exports = addEvent

function addEvent(target, type, handler) {
    var events = EvStore(target)
    var event = events[type]

    if (!event) {
        events[type] = handler
    } else if (Array.isArray(event)) {
        if (event.indexOf(handler) === -1) {
            event.push(handler)
        }
    } else if (event !== handler) {
        events[type] = [event, handler]
    }
}