A deep dive into jQuery selector tag elements

In-depth understanding of jQuery tag element selectors requires specific code examples

In front-end development, jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling provide developers with efficient tools. In jQuery, the selector of the label element is a very important part. Selectors can be used to conveniently operate and control page elements. In this article, we will delve into the selectors of jQuery tag elements and provide specific code examples to help readers better understand and master them.

1. Basic selectors

jQuery provides a series of basic selectors for selecting specified elements. Among them, the most commonly used is the basic selector, which can select elements by their tag name, class name, ID, etc.

1.1 Select elements by tag name

$("div") // 选取所有<div>元素

1.2 Select elements by class name

$(".class-name") // 选取所有class为class-name的元素

1.3 Select elements by ID

$("#id-name") // 选取ID为id-name的元素

2. Level selector

In addition to basic selectors, jQuery also provides hierarchical selectors, which can select parent elements, child elements, adjacent elements, etc. of an element.

2.1 Child element selector

$("ul > li") // 选取所有<ul>元素的直接子元素<li>

2.2 Descendant element selector

$("div span") // 选取所有<div>元素下的<span>元素

2.3 Sibling element selector

$("h2 + p") // 选取所有紧接在<h2>元素后的<p>元素

3. Filter selector

Filter selectors can filter elements based on their specific conditions, such as visible elements, hidden elements, elements with specific attributes, etc.

3.1 :visible selector

$("div:visible") // 选取所有可见的<div>元素

3.2 :hidden selector

$("div:hidden") // 选取所有隐藏的<div>元素

3.3 :has selector

$("div:has(p)") // 选取含有<p>元素的<div>元素

4. Form element selector

For form elements, jQuery provides specific selectors to facilitate operations on form elements.

4.1 :input selector

$(":input") // 选取所有的输入元素

4.2 :checked selector

$(":checked") // 选取所有被选中的复选框或单选按钮

4.3 :enabled selector

$(":enabled") // 选取所有可用的元素

Summary

Passed With the introduction of this article, readers should have a deeper understanding of the selectors of jQuery tag elements. Selectors are the basis for jQuery to operate DOM. Proficient in selectors can help developers perform front-end development work more efficiently. In addition to the selectors mentioned in this article, jQuery also provides more rich selector usage. Readers can learn and explore further by viewing the official documentation.

We hope that the code examples provided in this article can help readers better understand and use the selectors of jQuery tag elements and improve their front-end development skills. I wish readers better results in development!

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