Course Introduction：Use HTML5DragandDrop API to implement web drag and drop without the need for external libraries. 1. Make elements draggable by setting draggable="true"; 2. Use the dragstart event to store drag data; 3. Add dragover and drop event processing in the drop area to accept drag and drop; 4. Optionally provide drag and drop visual feedback through CSS and JavaScript; 5. Pay attention to calls to e.preventDefault(), single transfer restrictions and browser compatibility issues.
2025-06-28 comment 0 792
Course Introduction：HTML5 drag and drop function is implemented through dragstart, dragover, drop and other events, and is often used for file upload and element interaction. ① When implementing, you need to set the element draggable="true" and prevent the default behavior of the dragover; ② File upload depends on the DataTransfer object to obtain the file list; ③ Element interaction requires storage of data in dragstart and reading in drop; ④ Pay attention to browser compatibility and mobile adaptation; ⑤ Add visual feedback to improve user experience.
2025-07-07 comment 0 173
Course Introduction：JavaScript needs to be triggered through user interaction. 1. Use the file to get and read the content through FileReader, supporting text, Base64, binary and other formats; 2. When parsing CSV, process by line, JSON uses JSON.parse and catches exceptions; 3. Supports listening to dragover and drop events during drag and drop upload to improve user experience; all methods are implemented based on FileAPI and are suitable for most front-end scenarios.
2025-07-20 comment 0 678
Course Introduction：Navicat's code snippet function can be set and used in the following steps to improve efficiency: 1. Find the "Code Snippet" panel on the left side of the query editor. If it is not displayed, it will be enabled through "View>Code Snippet"; 2. You can create folders to classify the fragments, such as reports, data cleaning, etc.; 3. Add custom fragments to right-click the panel to select "Add Code Snippet" or "Add Folder", enter the name and paste the code; 4. The fragments are stored by database type, and they must be configured separately by MySQL, PostgreSQL, etc.; 5. Use drag and drop to quickly insert the fragments into the query editor; 6. It is recommended to use placeholders in the fragments for subsequent modification, keep the fragments concise, and update the fragment content regularly, and can be exported/derived.
2025-07-23 comment 0 379
Course Introduction：The key to making a pure CSS drop-down menu is that it has clear structure, natural interaction, and no JavaScript is required. 1. Use unordered lists and list items to build a semantic HTML structure. Place the main menu item under .menu, and the submenu is implemented with nesting; 2. Display hidden through CSS's :hover pseudo-class and positioning control. Use display:none; hide submenu by default. Use display:block; to display when hovering, and set position:absolute; to coordinate with parent element position:relative; to coordinate positioning; 3. Optimize the experience and add transition animations, such as opacity and visibility combined with transition implementation.
2025-07-09 comment 0 732
Course Elementary 13825
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 82361
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 13181
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 24630
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 27488
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.
2024-03-26 12:34:33 0 1 659
javascript - Native js+localStorage to achieve shopping cart effect
2017-06-12 09:26:38 0 1 1125
Laravel Modal does not return data
2024-03-29 10:31:31 0 1 608
Can I use the automatic generation module of thinkphp5 in Windows 7 system? How to configure and use
2017-10-10 17:04:14 0 2 1408
