<div class="dropDown" data-key="A-a">
a
</div>
<div class="dropDown" data-key="B-b">
b
</div>
<div class="dropDown" data-key="C-c">
c
</div>
<div class="dropDown" data-key="D-d">
d
</div>
JavaScript
document.addEventListener("DOMContentLoaded", function(event) {
var drop = document.getElementsByClassName('dropDown');
for ( i=0; i<drop.length; i++ ){
drop[i].addEventListener('click',function(){
console.log( this.getAttribute("data-key") )
},false)
}
});
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