Understand the usage of different types of selectors in jQuery

Selectors are a very important concept in jQuery, which can help us accurately locate and operate elements on the page. This article will introduce the usage of different types of selectors in jQuery, including basic selectors, hierarchical selectors, filter selectors and attribute selectors, and provide specific code examples to help readers better understand and master the usage of these selectors.

1. Basic selector

The basic selector is one of the most commonly used selectors. It can select elements by element name, class name or ID. Here is sample code for a few basic selectors:

1. Select all <div> elements: <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:javascript;toolbar:false;'>$('div')</pre><div class="contentsignin">Copy after login</div></div></li><li><p> Select the element with class name <code>example:

   $('.example')

2. Select the element with ID my-element:

   $('#my-element')

2. Hierarchical selector

The hierarchical selector can select elements based on the relationship between elements, including child elements, descendant elements, adjacent elements and sibling elements. The following is sample code for several hierarchical selectors:

1. Selects all child elements under the parent element:

   $('parent > child')

2. Selects under the ancestor element All descendant elements:

   $('ancestor descendant')

3. Select adjacent elements:

   $('element + next')

4. Select all sibling elements:

   $('element ~ siblings')

3. Filter selector

Filter selector can select elements based on their status or position, including visible elements, hidden elements, first element, last element, etc. The following are several commonly used filter selector sample codes:

1. Select all visible elements:

   $(':visible')

2. Select all hidden elements:

   $(':hidden')

3. Select the first element:

   $('element:first')

4. Select the last element:

   $('element:last')

4. Attributes Selector

Attribute selector can select elements based on their attributes, including attribute existence, attribute value equal to a certain value, attribute value starting with a certain string, etc. Here is sample code for several attribute selectors:

1. Select elements with the title attribute:

   $('[title]')

2. Select hrefElements with attribute values ​​starting with https:

   $('[href^="https"]')

3. Select classAttribute values ​​containing example# Elements of ##:

   $('[class*="example"]')

   Through the above example code, readers can better understand and master the usage of different types of selectors in jQuery. Selectors are a very important part of jQuery. Mastering the use of selectors can help us operate elements on the page more efficiently and achieve various interactive effects and functions. I hope this article is helpful to readers, thank you for reading!

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