What’s The DOM And DOM Manipulation In JavaScript

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What’s The DOM And DOM Manipulation In JavaScript

The DOM (Document Object Model) is a programming interface for HTML and XML documents. It represents the structure of a document as a tree-like hierarchy, where each element in the document is represented by a node in the tree. The DOM allows developers to access, modify, and manipulate the content and structure of a document.

JavaScript is commonly used to manipulate the DOM, allowing developers to change the content, style, and layout of a web page in real-time. This process is known as DOM manipulation.

One of the most common ways to manipulate the DOM is by using the getElementById method to select an element by its unique id attribute and then using properties and methods to modify it. For example, the following code will change the content of an element with the id “my-element”:

let myElement = document.getElementById("my-element");
myElement.innerHTML = "New Content";

Another way to manipulate the DOM is by using the querySelector and querySelectorAll methods to select elements using CSS selectors. For example, the following code will change the color of all elements with the class “my-class”:

let myElements = document.querySelectorAll(".my-class");
myElements.forEach(function(element) {
    element.style.color = "red";
});

DOM manipulation also allows developers to create new elements and append them to the document. For example, the following code will create a new div element and append it to the body of the document:

let newDiv = document.createElement("div");
newDiv.innerHTML = "New Div";
document.body.appendChild(newDiv);

It’s worth noting that manipulating the DOM can be a performance-intensive task and care should be taken to minimize the number of times the DOM is updated in a single execution cycle.

Conclusion

Overall, the DOM is a programming interface for HTML and XML documents, and DOM manipulation is the process of using JavaScript to access, modify, and manipulate the content and structure of a web page in real-time.

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