Learn basic jQuery selectors from scratch: get started quickly!

Learn jQuery basic selectors from scratch: Get started quickly!

jQuery is an easy-to-learn and use JavaScript library that simplifies manipulation and event handling of HTML documents. Among them, selectors are one of the cornerstones of jQuery. Through selectors, we can easily select HTML elements, operate DOM and achieve interactive effects. This article will introduce the basic selectors of jQuery from scratch to help readers get started quickly.

First, we need to introduce the jQuery library into the HTML document. It can be introduced through a CDN link or downloaded file, for example:

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>

Once the jQuery library is introduced, we can start using selectors. Here are some basic selector examples:

Basic Selector

1. Select elements by element name:

$('div') // 选取所有的<div>元素

2. Select by class name Element:

$('.classname') // 选取所有类名为classname的元素

3. Select element by ID:

$('#id') // 选取ID为id的元素

4. Select all elements:

$('*') // 选取所有元素

Hierarchical selector

1. Descendant selector (selects all descendant elements):

$('parentElement descendantElement') // 选取parentElement中的所有descendantElement元素

2. Child element selector (selects only direct child elements):

$('parentElement > childElement') // 选取parentElement中的所有直接子元素childElement

Filter selector

1. First element:

$('selector:first') // 选取第一个匹配的元素

2. Last element:

$('selector:last') // 选取最后一个匹配的元素

3. Odd position elements:

$('selector:odd') // 选取所有奇数位置的元素

4. Even position elements:

$('selector:even') // 选取所有偶数位置的元素

Form selector

1. Select input box elements:

$('input[type="text"]') // 选取所有type属性为text的<input>元素

2. Select the selected checkbox:

$('input:checked') // 选取所有被选中的<input>元素

The above are just basic usage examples of jQuery selector. Through these examples, readers can quickly get started using jQuery The selector function. Of course, jQuery also provides more complex selectors and functions, and readers can continue to learn and explore in depth. I hope this article can help readers learn jQuery basic selectors from scratch and operate DOM elements more flexibly and efficiently in web development.

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