NodeList上的addEventListener [英] addEventListener on NodeList

问题描述

NodeList是否支持addEventListener。如果不是，将EventListener添加到NodeList的所有节点的最佳方法是什么。目前我使用的代码片段如下所示，是否有更好的方法。

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);
}

推荐答案

没办法办它没有遍历每个元素。当然，您可以编写一个函数来为您完成。

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); 

或更专业的版本：

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); 

而且，虽然你没有问过jQuery，但这是jQuery特别重要的东西擅长：

And, though you didn't ask about jQuery, this is the kind of stuff that jQuery is particularly good at:

$('.coins').on('dragstart', handleDragStart);

这篇关于NodeList上的addEventListener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！