JavaScript functions usually require access to the parent element in the DOM.

In JavaScript, it can be implemented using element.parentNode.

In jQuery, you can use element.parent() to achieve the same function.

The following is a JavaScript example:

HTML:

<ul id="tabs"></ul>
<li class="firsttab"><a href="http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15b">one</a></li>
<li class="secondtab"><a href="http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15b">two</a></li>

JavaScript:

function init() {
  var tablinks = document.getElementById('tabs').getElementsByTagName('a');
  for (var i = 0, j = tablinks.length; i < j; i++) {
    tablinks[i].onclick = doit;
  }
}

function doit() {
  alert(this.parentNode.className);
}

window.onload = init;

FAQs (FAQ) on accessing parent elements in JavaScript and jQuery

What is the difference between parentElement and parentNode in JavaScript?

In JavaScript, both parentElement and parentNode are used to access the parent element of a specific element. However, there are nuances between the two. The parentNode attribute returns the parent node of an element as a Node object, meaning it can return any type of node (element node, text node, comment node, etc.). On the other hand, the parentElement attribute returns the parent node as an Element object, meaning it returns only the element node. If the parent node is not an element node, parentElement will return null.

How to use jQuery to access parent element?

In jQuery, you can use the parent() method to get the direct parent element of the selected element. For example, if you have an element with id "child", you can access its parent element like this: $("http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15bchild").parent(). This will return a jQuery object containing the parent element.

Can I access grandfather elements or higher-level ancestor elements in JavaScript?

Yes, you can access the grandfather element or any higher-level ancestor element via the link parentElement or parentNode attributes. For example, to access the grandfather element of an element, you can use element.parentElement.parentElement.

What happens to JavaScript if the parent element is not an HTML element?

If the parent node of an element is not an HTML element (for example, it might be a text node or annotation node), the parentElement attribute returns null. However, the parentNode property will still return the parent node regardless of its type.

How to get all ancestor elements of a specific element in jQuery?

In jQuery, you can use the parents() method to get all the ancestor elements of a specific element. For example, $("http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15bchild").parents() will return a jQuery object containing all ancestor elements of an element with id 'child'.

Can I filter the parent element obtained using jQuery?

Yes, you can filter the parent elements obtained using jQuery. Both the parent() and parents() methods can accept selectors as parameters, and they return only the parent element that matches that selector. For example, $("http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15bchild").parents("div") will only return the ancestor element as a div.

How to get the nearest ancestor element in JavaScript that meets a specific condition?

In JavaScript, you can use the closest() method to get the closest ancestor element that meets a specific condition. This method accepts a selector as a parameter and returns the closest ancestor element that matches the selector. For example, element.closest("div") will return the closest ancestor element as the div.

and parents() methods in closest()?

In jQuery, the parents() method returns all ancestor elements that meet a specific condition, while the closest() method returns only the closest ancestor elements that meet the condition. So if you only need the nearest matching ancestor, use closest(). If you need all matching ancestors, use parents().

Can I access the parent element of a text node or annotation node in JavaScript?

Yes, you can use the parentNode attribute to access the parent element of a text node or annotate node in JavaScript. This property returns the parent node of any type of node, including text nodes and comment nodes.

How to check if an element has a parent element in JavaScript?

In JavaScript, you can use the parentElement or parentNode attributes to check if an element has a parent element. If an element has a parent element, these properties return the parent element or node. If the element has no parent element, these properties will return null. So you can use a condition like if (element.parentElement) or if (element.parentNode) to check if an element has a parent element.

The above is the detailed content of Access a Parent Element With JavaScript or jQuery. For more information, please follow other related articles on the PHP Chinese website!