Course Introduction：This article discusses the limitations faced by directly changing the parent element style in CSS/SCSS based on the child element state (such as the check box selected state). As CSS currently lacks a mature and cross-browser-compatible "parent selector", it is difficult to implement such requirements directly through CSS. The article elaborates on why JavaScript is the most reliable and recommended solution for implementing this dynamic style tuning, and provides specific JavaScript code examples and implementation steps, while highlighting relevant considerations and best practices.
2025-08-12 comment 0 178
Course Introduction：This article discusses the limitations of pure CSS schemes when implementing element drag and drop in the web front-end, and provides an efficient drag and drop algorithm based on JavaScript. By parsing mousedown, mousemove and mouseup events in detail, combined with sample code, we show how to accurately control element locations to solve performance problems and achieve a smooth user interaction experience.
2025-08-23 comment 0 144
Course Introduction：This article explores the problem that when trying to get an existing object instance through class names and specific properties such as name, the default behavior is to create new objects rather than retrieve existing objects. In response to this challenge, the tutorial details how to use Metaclass and its __call__ method to control the instance creation process, implement object uniqueness management based on attribute values ??(such as names), and ensure that the same instance can be returned every time an object with the same name is requested. At the same time, the article emphasizes the importance of instance attribute immutability to maintaining object uniqueness and provides best practices for implementing read-only attributes through attribute decorators.
2025-09-08 comment 0 162
Course Introduction：Yii2 AdminLTE is a backend management system template based on the Yii2 framework and AdminLTE management template. It provides a wealth of controls and features that can help developers quickly build powerful backend management systems. Installation and use: Install through composer: composer requires kartik-v/yii2-adminlte to configure the AdminLTE module in config/web.php to run the migration command: yii migrate/up --migrationPath=@kartik-v/yii2-adminlte/migrations
2025-04-18 comment 0 476
Course Introduction：Laravel is a PHP framework based on MVC architecture, with concise syntax, powerful command line tools, convenient data operation and flexible template engine. 1. Elegant syntax and easy-to-use API make development quick and easy to use. 2. Artisan command line tool simplifies code generation and database management. 3.EloquentORM makes data operation intuitive and simple. 4. The Blade template engine supports advanced view logic.
2025-04-19 comment 0 1012
Course Elementary 13930
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82483
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13267
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24734
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27568
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
Show div based on selected element value using JavaScript and CSS
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PHP's latest plug-in backend management system is really easy to use. I recommend it~
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