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Course Introduction：To create an HTML selection drop-down list, 1. Use and combine it with elements; 2. You can set default options by adding selected attributes; 3. Use group options to improve readability; 4. Enhance accessibility with tags; 5. Pay attention to style control restrictions and mobile adaptation issues; 6. It is recommended to use required attributes and avoid too many options affecting the user experience; 7. When submitting, you need to verify the input on the server side.

2025-06-30 comment 0  268

Course Introduction：How to use Element-UI in Vue to implement multi-stage linkage drop-down boxes? Use multiple El-Select components to bind data through v-model and use logic to control dynamic changes in options. Use a recursive function to efficiently generate and update the option list, dynamically update the options for subsequent drop-down boxes based on the selection results. Pay attention to the design of the data structure. A clear data structure can simplify the code logic. Considering performance issues when the data volume is large, use tree structure or virtual scrolling technology to optimize rendering. Handle errors to avoid program crashes. Pay attention to the readability and maintainability of the code, use meaningful variable names, add comments, and split the code into small, reusable functions.

2025-04-07 comment 0  450

Course Introduction：Form verification can be achieved through HTML5's required and pattern properties. 1.Required ensures that the field is not empty, and is suitable for text boxes, drop-down boxes, password boxes, etc.; 2. Pattern checks the format through regular expressions, such as mobile phone number, postal code, etc.; 3. The two are often used in combination. First verify whether it is empty, and then the pattern determines whether the format is correct; 4. Example: Use pattern to limit the combination of 4-10-digit alphanumeric characters and set the required attribute.

2025-07-06 comment 0  603

Course Introduction：Using data verification in Excel is mainly to limit the data type or range of input in cells and prevent incorrect input. 1. Restrict input to specified options: By setting the source of the list (such as "male, female, unknown"), the drop-down menu selection input is realized; 2. Set the value range: For example, set the age between 18 and 60, select an integer and set the minimum maximum value; 3. Prevent duplicate content: Check uniqueness with the formula = COUNTIF(A:A,A1)=1 to avoid duplication of ID number and other repetitions; 4. Ignore blank items: Check "Ignore empty values", allowing blanks, but the rules must be compliant when filling in, such as 11-digit phone numbers. Using these functions rationally can greatly reduce input errors, especially suitable for multi-person collaboration scenarios.

2025-07-06 comment 0  858

Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  672

Course Elementary  13772

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  82280

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  13144

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  24590

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  27446

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.