Does NodeList support addEventListener. If not what is the best way to add EventListener to all the nodes of the NodeList. Currently I am using the code snippet as show below, is there a better way to do this.
var ar_coins = document.getElementsByClassName('coins');
for(var xx=0;xx < ar_coins.length;xx++)
{
ar_coins.item(xx).addEventListener('dragstart',handleDragStart,false);
}
There is no way to do it without looping through every element. You could, of course, write a function to do it for you.
function addEventListenerList(list, event, fn) {
for (var i = 0, len = list.length; i < len; i++) {
list[i].addEventListener(event, fn, false);
}
}
var ar_coins = document.getElementsByClassName('coins');
addEventListenerList(ar_coins, 'dragstart', handleDragStart);
or a more specialized version:
function addEventListenerByClass(className, event, fn) {
var list = document.getElementsByClassName(className);
for (var i = 0, len = list.length; i < len; i++) {
list[i].addEventListener(event, fn, false);
}
}
addEventListenerByClass('coins', 'dragstart', handleDragStart);
And, though you didn't ask about jQuery, this is the kind of stuff that jQuery is particularly good at:
$('.coins').on('dragstart', handleDragStart);