search
HomeWeb Front-endFront-end Q&AConversion of dom to jquery object

DOM nodes are very important elements when using JavaScript for page development. DOM (Document Object Model) refers to parsing HTML or XML documents into a tree structure, allowing us to use JavaScript to access and manipulate any element in the document. However, sometimes we find that operating DOM nodes in details is very complicated and difficult to understand. This is why many developers prefer using jQuery. jQuery is a widely used JavaScript library, by using jQuery we can easily access and manipulate DOM nodes.

In this article, I will introduce how to use jQuery to convert DOM to jQuery objects, and how to use jQuery objects for various operations and transformations.

Conversion of DOM into jQuery objects

To convert DOM nodes into jQuery objects, we need to use jQuery's selector function. To use a selector function, we need to pass the tag name or class name or ID of the node as a parameter to the function. For example, if we have the following HTML code:

<div class="example" id="myDiv">Hello World!</div>

We can convert it into a jQuery object using the following code:

var myDiv = $('#myDiv');

Here, we use jQuery to convert a node into a jQuery object, using $() and then pass in '#myDiv', which is a selector that searches the HTML document for a div element with the id 'myDiv'. We can then access the element using the myDiv variable, which is now a jQuery object.

Besides that, we can also convert DOM nodes to jQuery objects by:

var myDiv = $('#myDiv')[0];

Here, we first convert the element to jQuery using $('#myDiv') object and then use [0] to convert it back to the original DOM node. This way we can access the original JavaScript properties and DOM methods of the element.

Conversion between jQuery objects

A jQuery object can find or store one or more elements and use various methods and properties to manipulate these elements. If we need to access a single element (like in the above example), we can use [0] to access it.

However, if we want to access multiple elements, we need to use a selector that returns multiple elements. In this way, we can convert multiple elements into jQuery objects using the following code:

var divs = $('.example');

Here we use the class selector '.example' which will search the HTML document for all elements containing that class , and returns it as a jQuery object.

In addition to using selectors to return jQuery objects for multiple elements, we can also use the following method to convert multiple elements into jQuery objects:

var listItems = $('li');
var listItem = $(listItems[0]);

Here, we first convert all The li elements are converted to jQuery objects, then listItem[0] is used to convert the first li element back to the original DOM node.

Expansion and contraction of jQuery objects

We can also expand or contract jQuery objects by adding or removing DOM elements. We can add DOM elements to the page using the following method:

var newDiv = $('<div>');
newDiv.addClass('newDiv').text('Hello World!');
$('body').append(newDiv);

Here, we first convert a new div element into a jQuery object using $('

') and then use addClass('newDiv' ) add a class attribute to it and add some text using text('Hello World!'). We then use append(newDiv) to add the new div element to the body element of the page.

We can also remove DOM elements from the page using the following method:

var firstListItem = $('li:first-child');
firstListItem.remove();

Here, we first find the first li element through the selector and then use the remove() method to remove it from the page Delete the element.

Summary

Using jQuery, we can access DOM nodes very easily. We can use selector functions to convert DOM nodes into jQuery objects and manipulate them using various methods and properties.

We can also convert multiple DOM elements into jQuery objects and manipulate them using various methods and properties. We can add or remove elements to expand or shrink jQuery objects.

Using jQuery, we can more easily write maintainable and understandable JavaScript code.

The above is the detailed content of Conversion of dom to jquery object. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What is useEffect? How do you use it to perform side effects?What is useEffect? How do you use it to perform side effects?Mar 19, 2025 pm 03:58 PM

The article discusses useEffect in React, a hook for managing side effects like data fetching and DOM manipulation in functional components. It explains usage, common side effects, and cleanup to prevent issues like memory leaks.

Explain the concept of lazy loading.Explain the concept of lazy loading.Mar 13, 2025 pm 07:47 PM

Lazy loading delays loading of content until needed, improving web performance and user experience by reducing initial load times and server load.

What are higher-order functions in JavaScript, and how can they be used to write more concise and reusable code?What are higher-order functions in JavaScript, and how can they be used to write more concise and reusable code?Mar 18, 2025 pm 01:44 PM

Higher-order functions in JavaScript enhance code conciseness, reusability, modularity, and performance through abstraction, common patterns, and optimization techniques.

How does currying work in JavaScript, and what are its benefits?How does currying work in JavaScript, and what are its benefits?Mar 18, 2025 pm 01:45 PM

The article discusses currying in JavaScript, a technique transforming multi-argument functions into single-argument function sequences. It explores currying's implementation, benefits like partial application, and practical uses, enhancing code read

How does the React reconciliation algorithm work?How does the React reconciliation algorithm work?Mar 18, 2025 pm 01:58 PM

The article explains React's reconciliation algorithm, which efficiently updates the DOM by comparing Virtual DOM trees. It discusses performance benefits, optimization techniques, and impacts on user experience.Character count: 159

What is useContext? How do you use it to share state between components?What is useContext? How do you use it to share state between components?Mar 19, 2025 pm 03:59 PM

The article explains useContext in React, which simplifies state management by avoiding prop drilling. It discusses benefits like centralized state and performance improvements through reduced re-renders.

How do you prevent default behavior in event handlers?How do you prevent default behavior in event handlers?Mar 19, 2025 pm 04:10 PM

Article discusses preventing default behavior in event handlers using preventDefault() method, its benefits like enhanced user experience, and potential issues like accessibility concerns.

What are the advantages and disadvantages of controlled and uncontrolled components?What are the advantages and disadvantages of controlled and uncontrolled components?Mar 19, 2025 pm 04:16 PM

The article discusses the advantages and disadvantages of controlled and uncontrolled components in React, focusing on aspects like predictability, performance, and use cases. It advises on factors to consider when choosing between them.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment