search
HomeWeb Front-endJS TutorialSummary of jQuery's powerful selectors_jquery

A basic selector
$("input"): Select all elements with input tags
$("#input1"): Select the element with the id of input1
$(" .acss"): Select all
codes that contain acss this css class style
Copy the code The code is as follows:


link



<script> <BR>var oo = $("input"); //oo is The set of the above 3<BR>var pp = $("#input1");//pp is the first one<BR>var qq = $(".acss");//qq is the set of the first two<BR></script>


You can use the above 3 combined queries
var ww = $("input.acss"); / /Select the input tag element with acss
var ee = $("input#Text1.acss");//Select the input tag element with acss ID of Text1
2. Sub-selection
The parent node and the direct child node are separated by (>), that is, the child selector method is implemented
Copy code The code is as follows:















< ;/a>



< ;script>
var oo = $("p a "); //Selected all a below p
var pp = $("p>a"); //Selected 2 a elements, The ids are a1 and a2
var qq = $("p.acss a"); //The element with id a1 is selected


3. Feature selector
Select a[href^=http://]
Code
Copy code The code is as follows:









var oo = $("a[href^=http://]"); //Select a whose href starts with http://. a3 selects
var pp = $("input[name$=Input]"); //Select the input whose name ends with Input. Text3, Text4 selected
var qq = $("a[href*=com]"); //Select href to include a of com. a3, a4 are selected
var ww = $("input[id=Text3]"); //Select exactly equal to


In addition, jQuery also provides the has method, as in the above example,
div:has(input) means.Select all divs containing input
Note: div input selects all input elements in the div
4. Position selector
The position selector is mainly based on the position of the element. Select,
div a:first returns the first a in the div on the page
div a last returns the last a in the div on the page
div odd returns the div at the even position on the page
div even Return the idv of the odd position on the page
div first-child Returns the first child selection in the div
div last-child Returns the last child selection in the div
only-child element without sibling nodes
nth -child(n): nth child node
eq(n) nth matching element
gt(n) matching elements after n do not contain
lt(n) matching elements before n do not contain
5. jQuery custom selection
名称 说明 解释
:input 匹配所有 input, textarea, select 和 button 元素 查找所有的input元素: 
$(":input")
:text 匹配所有的文本框 查找所有文本框: 
$(":text")
:password 匹配所有密码框 查找所有密码框: 
$(":password")
:radio 匹配所有单选按钮 查找所有单选按钮
:checkbox 匹配所有复选框 查找所有复选框: 
$(":checkbox")
:submit 匹配所有提交按钮 查找所有提交按钮: 
$(":submit")
:image

匹配所有图像域

匹配所有图像域: 
$(":image")
:reset 匹配所有重置按钮 查找所有重置按钮: 
$(":reset")
:button 匹配所有按钮 查找所有按钮: 
$(":button")
:file 匹配所有文件域 查找所有文件域: 
$(":file")

名称 说明 解释
:enabled

匹配所有可用元素

Find all available input elements:
$("input:enabled")
:disabled Match all unavailable elements Find all disabled input elements:
$("input:disabled")
:checked Matches all selected selected elements (check boxes, radio buttons, etc., excluding options in select) Find all checked checkbox elements:
$("input:checked")
:selected Matches all selected option elements Find all selected option elements:
$("select option:selected")
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
From C/C   to JavaScript: How It All WorksFrom C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsJavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldBeyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AM

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript: Exploring the Versatility of a Web LanguageJavaScript: Exploring the Versatility of a Web LanguageApr 11, 2025 am 12:01 AM

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The Evolution of JavaScript: Current Trends and Future ProspectsThe Evolution of JavaScript: Current Trends and Future ProspectsApr 10, 2025 am 09:33 AM

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

Demystifying JavaScript: What It Does and Why It MattersDemystifying JavaScript: What It Does and Why It MattersApr 09, 2025 am 12:07 AM

JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)