js dom to jquery object

In front-end development, JavaScript is one of the core languages, and JavaScript DOM programming is also an integral part of front-end development. However, when using native JavaScript to perform DOM operations, the amount of code is often large and not intuitive enough. Therefore, many people choose to use jQuery, a JavaScript library, to simplify DOM programming and make the code more readable and understandable. Well, in actual development, we often need to convert native JavaScript DOM objects into jQuery objects for operation. This article will introduce how to convert JavaScript DOM objects into jQuery objects.

I. jQuery objects and JavaScript DOM objects

Before we explain in depth the conversion of DOM to jQuery objects, we need to first understand the concepts of jQuery objects and JavaScript DOM objects.

1. JavaScript DOM Object

DOM (Document Object Model) is an API for manipulating HTML and XML documents. In JavaScript, we modify and interact with elements on an HTML page through DOM manipulation. In JavaScript, we can access elements in an HTML document through the document object. For example, if we want to access an element with the ID "title", we can use the following code:

var title = document.getElementById("title");

In the above code, we obtain the element with the ID "title" through the getElementById method of the document object. This The title object obtained is a JavaScript DOM object.

2. jQuery Object

jQuery is a very popular JavaScript library that provides a series of convenient methods and functions to make JavaScript programming more concise and readable. When using jQuery for DOM operations, we usually use its selector to select an element and then encapsulate it into a jQuery object. For example, if we want to select the element with the ID "title" and turn it into a jQuery object, we can use the following code:

var title = $("#title");

In the above code, we use the $ symbol as the identifier of a jQuery object , then select the element with the ID "title" through the selector, and finally encapsulate it into a jQuery object and store it in the title variable.

It should be noted that although jQuery objects and JavaScript DOM objects both have methods and properties for accessing and modifying HTML elements, they are two different object types.

II. Convert JavaScript DOM objects into jQuery objects

1. Use the $() method

The easiest way to convert JavaScript DOM objects into jQuery objects The method is to use jQuery's $() method. The $() method can accept any JavaScript object as a parameter and encapsulate it into a jQuery object.

For example, if we want to convert the JavaScript DOM object obtained above into a jQuery object, we can use the following code:

var title = document.getElementById("title");
var $title = $(title);

In the above code, we use jQuery’s $() method , encapsulates the native JavaScript DOM object title into a jQuery object, and finally stores it in the $title variable.

It should be noted that a jQuery object encapsulated using the $() method will always return a jQuery object, even if it is encapsulated into an object that is originally a jQuery object. Therefore, we need to pay attention to this issue to avoid errors when the code is run.

2. Using jQuery functions

In addition to using the $() method, we can also use jQuery functions to convert JavaScript DOM objects into jQuery objects.

For example, if we still want to encapsulate a JavaScript DOM object into a jQuery object, we can use the following code:

var title = document.getElementById("title");
var $title = jQuery(title);

In the above code, we use the jQuery function to convert the JavaScript DOM object The title is encapsulated into a jQuery object and finally stored in the $title variable.

It should be noted that in addition to using the $() method and jQuery function method, jQuery also provides some additional methods to convert different types of objects into jQuery objects. These methods include:

• $.parseHTML() method for converting strings into jQuery objects
• $.makeArray for converting common JavaScript objects into jQuery objects () method
• $.fn.get() method used to convert a collection of DOM elements into a jQuery object, etc.

III. Summary

In front-end development , JavaScript DOM programming is a very important part. When we need to use jQuery for DOM operations, we first need to convert the native JavaScript DOM object into a jQuery object. This can be achieved through jQuery's $() method or jQuery functions. No matter which method is used, the essence is to encapsulate the native JavaScript DOM object into a jQuery object, so that we can use the methods and attributes provided by jQuery to operate elements of the HTML page.

Of course, in the actual development process, we may encounter more complex scenarios. For example, when we need to convert a set of JavaScript DOM objects into jQuery objects, how do we do this? This issue will be explained in other articles, please continue to pay attention to our content.

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