How to change CSS style using jquery

jquery is one of the most commonly used javascript libraries in web development. In jq, we can easily use its selectors, event handling, AJAX and other functions to enhance our web design and interactive experience. In addition, jquery also provides a series of CSS operation methods, providing a more convenient one-stop solution for our CSS design. This article will introduce how to use jquery to change CSS styles.

1. CSS Selector

Before using jquery to change CSS styles, we first need to understand CSS selectors. Simply put, CSS selectors are patterns used to match HTML elements. It can be selected by element type, class name, ID, attributes, etc. The following are some commonly used CSS selectors:

1) Element selector

The element selector can select based on the name of the HTML element itself. For example, the following code will set the color of all paragraph elements to red:

$('p').css('color', 'red');

2) Class selector

The class selector can select based on the class attribute of the HTML element. For example, the following code will set the color of all elements with the class name "myClass" to blue:

$('.myClass').css('color', 'blue');

3) ID selector

The ID selector can be based on the id of the HTML element Properties to select. For example, the following code will set the background color of the element with the id "myId" to yellow:

$('#myId').css('background-color', 'yellow');

2. CSS Property Operation

After understanding CSS selectors , we can start using jquery to manipulate CSS properties. The following are some commonly used CSS property operation methods:

1) Set CSS property values

We can use the css() method to set CSS property values. For example, the following code will set the font size of all p elements to 20 pixels:

$('p').css('font-size', '20px');

2) Get the CSS attribute value

We can also use the css() method to get the CSS attribute value value. For example, the following code will get the font size of the first p element:

$('p:first').css('font-size');

3) Set multiple CSS attribute values ​​​​at the same time

We can use the css() method to set multiple CSS properties at the same time The value of the CSS property. For example, the following code will set the font size and color of all p elements to 20 pixels and red at the same time:

$('p').css({
    'font-size': '20px',
    'color': 'red'
});

4) Manipulate the class name

We can use addClass(), removeClass( ) and toggleClass() methods to operate the class attribute of the element to achieve changes in CSS styles. For example, the following code will switch the class name of all p elements to "myClass" to achieve CSS style changes:

$('p').toggleClass('myClass');

5) Manipulate CSS style sheets

We can also use jquery to manipulate CSS Style sheets further enhance the control capabilities of CSS styles. The following are some commonly used CSS style sheet operations:

1) Add a CSS style sheet

We can use the prepend() and append() methods to add a CSS style sheet. For example, the following code will add a link tag in the tag, pointing to the "style.css" file:

$('head').append('<link rel="stylesheet" href="style.css" type="text/css" />');

2) Delete the CSS style sheet

We can use remove( ) method to delete a CSS style sheet. For example, the following code will delete all link tags in the head tag:

$('head link').remove();

3) Replace CSS style sheet

We can use the replaceWith() method to replace the CSS style sheet. For example, the following code will delete the original style sheet and replace it with the style sheet in the "newStyle.css" file:

$('head link').replaceWith('<link rel="stylesheet" href="newStyle.css" type="text/css" />');

Summary

In actual development, jquery's CSS operation method It is very convenient and can greatly reduce the development time and difficulty of programmers and improve work efficiency. When choosing a CSS style operation method, developers should make a choice based on the specific situation and avoid abuse. At the same time, in order to maintain the maintainability and readability of the code, we should follow certain specifications and best practices to write high-quality code.

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