Event Listeners

    // JavaScript Event Listeners
    // Event-driven programming: your program waits for events and uses them as triggers to run the next function(s)
    document.addEventListener('DOMContentLoaded', init); 

    function init ( ) {
        let btn = document.getElementById('btn'); 
        let lnk = document.getElementById('lnk'); 
        let txt = document.getElementById('txt');
    
        txt.addEventListener('input', ev => { 
            console.log(ev.type, ev.target, ev.target.value);
        } );
        
        txt.addEventListener('change', ev => { 
            console.log(ev.type, ev.target, ev.target.value);
        } );
        
        txt.addEventListener('blur', ev => {
            console.log(ev.type, ev.target, ev.target.value);
        } );
        
        btn.addEventListener('click', buttonClicked);
        
        lnk.addEventListener('click', linkClicked);
    }
    
    function buttonClicked(ev){
        console.log(ev.type, ev.target, ev.currentTarget);
    }
    
    function linkClicked(ev){
        ev.preventDefault; // stop the link from being followed 
        console.log(ev.type, ev.target, ev.currentTarget);
    }
    
    // object.addEventListener(event, function)
    myDiv.addEventListener('click', doSomething)
    
    function doSomething(ev){ 
        console.log(ev.type) // click 
        console.log (ev.target) //
    }