


Example of simple form standardization - semantic structure_form special effects
1. Use fieldset and legend tags
In forms, we often group the information in the form. For example, in a registration form, we may group the registration information into basic information (generally required), details Information (generally optional), so how can we achieve it better? We can consider adding the following two tags to the form:
fieldset: Group the form. A form can have multiple fieldsets
legend: Description of the content of each group
[Ctrl A Select all Note: If you need to introduce external Js, you need to refresh to execute ]
Fieldset is bordered by default , and legend is generally displayed in the upper left corner by default. But in some cases, you may not want to let the default styles or default layouts of fieldsets and legends affect the aesthetics of the design.
Solution: Set the fieldset's border to 0 and the legend's display to none in CSS.
2. Use label label
We give a label label to the text label in the form, and use the for attribute to associate it with the form component. The effect is that when you click the text label, the cursor Displayed in the corresponding form component.
In addition to the above methods, we can also use label to nest the entire form component and text label, such as:
First name:
According to the specification, the text will automatically Associated with adjacent form components, but unfortunately - the current mainstream browser IE6 does not support this feature.
3. Use the accesskey and tabindex attributes
The website should take into account more situations. For example, when there is no cursor device (such as a mouse), the form can also be completed using keyboard operations. Filling in, clicking at this time has no meaning for them. At this time, we choose label's accesskey (shortcut key, alt accesskey attribute value under IE, alt shift accesskey attribute value under FF) and tabindex attribute (Tab key, tabindex attribute value is sequence) to add to the form label, such as label, input etc.
4. optgroup 태그 사용
optgroup 태그의 역할은 선택 목록에서 옵션 세트를 정의하는 것입니다. optgroup 태그를 사용하여 select 요소의 옵션을 분류하고 label 속성을 사용하도록 선택할 수 있습니다. 속성 값은 드롭다운 목록(select)에서 선택할 수 없는 들여쓰기 제목으로 표시됩니다. 참고: optgroup은 중첩을 지원하지 않습니다.
[Ctrl A 모두 선택 참고: 외부 J를 도입해야 하는 경우 실행하려면 새로 고쳐야 합니다. ]
여기 IE6.0의 하나입니다. 작은 버그(FireFox에는 없음): IE에서 키보드 화살표 키를 사용하여 선택할 때 선택한 항목이 한 optgroup의 옵션에서 다른 optgroup의 옵션으로 변경되면 onchange가 작동하지 않습니다. 트리거되었습니다. 해결책은 문제 해결에 도움이 되도록 onkeydown 또는 onkeyup 이벤트를 추가하는 것입니다.
5. 버튼 태그를 사용하세요
정의 및 사용법
버튼 요소 내부에 텍스트나 이미지와 같은 콘텐츠를 넣을 수 있습니다. 이것이 이 요소와 입력 요소로 생성된 버튼의 차이점입니다.
정의 및 사용법
은 제출 버튼으로 정의됩니다. 버튼 요소 내에 텍스트나 이미지와 같은 콘텐츠를 배치할 수 있습니다. 이것이 이 요소와 입력 요소 버튼의 차이점입니다.
그리고 버튼 태그를 사용하는 것은 입력 버튼보다 의미가 더 강하고 문자 그대로 쉽게 이해할 수 있습니다.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.


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