遍历DOM从单击的元素获取节点 [英] Traversing up the DOM getting the node from a clicked element
问题描述
好吧，当我单击页面上的任何元素时，我想做的是以下操作：我想为元素所在的DOM构建一棵树。
OK, what I'm trying to do is the following, when I click on any element on the page and I want to build up a tree of the DOM of where the element lives.
html的示例
<html>
<head>
</head>
<body>
<ul>
<li><span>Elem 1</span></li>
<li><span>Elem 2</span></li>
<li><span>Elem 3</span></li>
</ul>
</body>
</html>
这是JS（来自click事件，并通过clicked元素）
This is the JS (comes from an click event and passes through the clicked element)
function getElementIdentifier(elem, domSelector, firstId) {
if(elem.tagName === 'HTML') {
return 'HTML ' + domSelector;
} else {
return getElementIdentifier(elem.parentNode, ' > ' +elem.tagName + ' ' + domSelector, firstId);
}
}
这在一定程度上有效，但涉及到事实上，我已经点击了列表中的第三项，它只会检索以下内容：
which works to an extent but when it comes to the fact that I've clicked on the third item in the list it only retrieves the following:
HTML > BODY > UL > LI > SPAN
但是我想检索第三个，因为这是我单击的那个。我有一个要演示的codepen。
But I want to retrieve the 3rd as this is the one I clicked. I've got a codepen I did to show.
http://codepen.io/tom-maton/pen/FljpL/
我不想使用jQuery-只是在寻找使用原始js。
I'm not wanting to use jQuery - just looking to use raw js.
推荐答案
这是最快的方法（至少对我来说如此）
function clickHandler(event) {
var target = event.target,
breadcrumb = [];
while (target) {
breadcrumb.unshift(target.tagName);
target = target.parentElement;
}
console.log(breadcrumb.join(" > "));
}
document.addEventListener('click', clickHandler, false);
在这里拨弄： http://jsfiddle.net/NTEv2/
带有兄弟姐妹的版本：
function getTagName(element) {
return element.tagName;
}
function clickHandler(event) {
var target = event.target,
breadcrumb = [],
temp;
while (target) {
target = target.parentElement;
if (target) {
breadcrumb.unshift(([].slice.call(target.children).map(getTagName).join(" + ")));
}
}
// HTML is always there
breadcrumb.unshift(document.documentElement.tagName);
console.log(breadcrumb.join(" > "));
}
document.addEventListener('click', clickHandler, false);
在这里拨弄： http://jsfiddle.net/NTEv2/1/
仅具有先前同级的版本（根据要求）：
function clickHandler(event) {
var target = event.target,
breadcrumb = [],
part = [],
prev = target,
temp;
while (target) {
if (prev) {
part.unshift(prev.tagName);
prev = prev.previousElementSibling;
} else {
target = target.parentElement;
prev = target;
breadcrumb.unshift(part.join(" + "));
part = [];
}
}
console.log(breadcrumb.join(" > "));
}
document.addEventListener('click', clickHandler, false);
在这里拨弄： http://jsfiddle.net/NTEv2/11/
这篇关于遍历DOM从单击的元素获取节点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！
