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Get Parent Node Javascript: Javascript Explained

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Javascript is a powerful and dynamic programming language used to create interactive websites and web-based applications. One of Javascript’s most commonly used features is the parent node, which is an important concept that many developers will use when building webpages, applications, and software. In this article, we’ll take a close look at what parent nodes are, how they work in Javascript, and how they can be used to write code more efficiently.

What is Parent Node in Javascript?

Parent node is a feature in the DOM (Document Object Model) of Javascript which refers to the node (object) that is the direct ancestor of another node. The parent node is the one that contains the node in question, such as a div element containing some text. Parent nodes can be used to contrrol and manipulate DOM elements in almost any web page or application.

For example, if you wanted to change the font size of a particular element, you could use the parent node to access the element and then use the appropriate Javascript methods to modify the font size. Additionally, parent nodes can be used to traverse the DOM tree, allowing you to access and manipulate elements that are nested within other elements.

Understanding Parent Nodes

In order to better understand how parent nodes work, it is important to have a basic knowledge of how the DOM works. The DOM structure can roughly be thought of as a tree-like structure with branches and leaves where each branch has its own nodes. Each node has a unique id so that it can be used to target a specific element or branch in order to manipulate the node or branch.

Parent nodes are the nodes that are located higher up in the DOM tree. They are the nodes that contain the other nodes and branches. By understanding how parent nodes work, developers can better understand how to traverse the DOM tree and manipulate the elements within it. Additionally, understanding parent nodes can help developers create more efficient code by allowing them to target specific elements without having to traverse the entire DOM tree.

Identifying Parent Nodes in Javascript

As mentioned previously, each node on the DOM tree has its own unique id which can be used to target it. This same id can also be used to determine the parent node of a particular branch. For example, if you have the id of an element such as a div, then you can use the getElementById() method of Javascript to return the parent node of the div (which would also be a div).

In addition to the getElementById() method, there are other methods available to identify parent nodes. For example, the parentNode property can be used to return the parent node of a given element. Additionally, the parentElement property can be used to return the parent element of a given node. Both of these methods can be used to traverse the DOM tree and identify the parent node of a given element.

Using the Parent Node Property

Once you have identified the parent node of a given element, you can take advantage of the parentNode property (sometimes referred to as the ‘parent of’ property) to access and manipulate the parent node. This means that you can, for example, change the class of an element’s parent or, using some additional logic you can also change sibling nodes or traverse up and down the DOM tree.

The parentNode property is a powerful tool for manipulating the DOM tree, as it allows you to access and modify the parent node of any given element. This can be used to add, remove, or modify elements in the DOM tree, as well as to traverse up and down the tree. Additionally, the parentNode property can be used to access the parent node’s attributes, such as its class or id, which can be used to further manipulate the DOM tree.

Accessing the Parent Node in Javascript

Accessing the parent node in Javascript is relatively straightforward. You simply need to first find the id of the element you want to target and then use the getElementById() method to access its parent node. When using this method it is important to remember that if an element does not have an id (such as text nodes), then it has no parent node.

In addition to the getElementById() method, you can also use the parentNode property to access the parent node of an element. This property is available on all elements and can be used to traverse up the DOM tree. It is important to note that the parentNode property will return null if the element does not have a parent node.

Traversing the DOM Tree with Parent Node

As previously mentioned, the parentNode property can be used to traverse up and down the DOM tree. This means that you can use it to access siblings, ancestors and descendants of an element. For instance, you could use it to access the children of an element by using a loop; this would allow you to easily iterate through all of the elements of an entire branch on the DOM tree with just one line of code.

Examples of Parent Nodes in Action

In order to better understand how parent nodes work in Javascript we will now look at a few examples. Let us assume that we have an unordered list with 3 items; if we want to access the list element (the parent node) then we would use the following code:

let list = document.getElementById('list'); let listParent = list.parentNode; 

This code would return a reference to the list element which we could then use to manipulate it further. Additionally, if we wanted to access all of the items on the list then we could use the following code:

let items = list.children; for(let i = 0; i < items.length; i++) {   let item = items[i]; // Do something with each item here }

Benefits of Utilizing Parent Node in Javascript

The main benefit of using parent nodes in Javascript is that it allows developers to write code more efficiently. By understanding how to access and manipulate its parent node, developers can quickly and easily traverse up and down the DOM tree which allows them to target specific elements or branches quickly and effectively. Additionally, as mentioned previously, parent nodes can also be used to access sibling nodes which allows developers to programmatically apply effects to groups of related nodes at once.

Tips for Working with Parent Node in Javascript

When working with parent nodes it is important to remember two things: 1) not all elements have a parent node so it is important to use the getElementById() method or another similar function to check for a valid id and 2) when traversing up or down the DOM tree, you should make sure that you are traversing in the correct direction which means that you should pay attention to the structure of each element and its relationship to other elements on the page.

Overall, utilizing parent nodes in Javascript provides developers with an efficient way of manipulating elements and branches on the DOM tree. By understanding what parent nodes are, how they work in Javascript, and their various benefits and uses, developers can write code more quickly, efficiently, and effectively.

Anand Das

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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