A deep dive into the various selector types in jQuery

jQuery is a widely used JavaScript library that is widely used in web development. In jQuery, selectors are a very important concept that allow developers to select and operate DOM elements based on specific conditions. Proficient use of selector types can greatly improve development efficiency and code readability. In this article, we'll take a deep dive into the various selector types in jQuery and provide concrete code examples.

1. Basic selector The basic selector is the simplest and most commonly used selector type in jQuery. You can select elements by their tag name, ID, and class name. For example:

// 通过标签名选择 $('div').css('color', 'red');

// 通过ID选择 $('#myId').fadeOut();

// 通过类名选择 $('.myClass').slideUp(); 2. Hierarchical selector The hierarchical selector can select child elements, descendant elements, etc. under the specified element. Common hierarchical selectors include child element selectors > , descendant selectors spaces, etc.

// 选取子元素 $('ul > li').css('background-color', 'yellow');

// 选取后代元素 $('form input').attr('disabled', 'true'); 3. Filter selector Filter selector allows developers to filter out elements that meet specific conditions. Common filter selectors include :first , :last , :even , :odd , etc.

// 选取第一个元素 $('li:first').addClass('highlight');

// 选取偶数位置元素 $('tr:even').css('background-color', 'lightgrey'); 4. Content selector The content selector selects elements based on their text content. Common content selectors include :contains() .

// 选择包含“Hello”的元素 $('p:contains("Hello")').addClass('greeting'); 5. State selector The state selector can select elements according to their state, such as visible state, hidden state, etc. Common state selectors are :visible , :hidden .

// 选取可见元素 $('img:visible').fadeIn();

// 选取隐藏元素 $('div:hidden').slideDown(); 6. Form selector The form selector is used to select form elements, such as input boxes, check boxes, drop-down boxes, etc. Common form selectors include :input , :checkbox , :radio , :button , etc.

// 选取输入框元素 $('input:text').css('border', '1px solid red');

// 选取复选框 $('input:checkbox').prop('checked', true); Through the flexible application of the above various selector types, developers can operate DOM elements more efficiently and achieve various dynamic effects and interactions. In actual development, the use of selector types needs to be flexibly selected according to specific scenarios to improve the maintainability and scalability of the code. I hope that through the introduction of this article, readers will have a deeper understanding of the selector types in jQuery and be able to use them more skillfully to complete various tasks.

A deep dive into the various selector types in jQuery

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