Bootstrap button drop-down menu example tutorial
This chapter will explain how to use the Bootstrap class to add a drop-down menu to a button. To add a drop-down menu to a button, simply place the button and drop-down menu in a .btn-group . You can also use to indicate that the button acts as a drop-down menu.
Previous words
The button-type drop-down menu is basically the same as the drop-down menu in appearance. The difference is that ordinary drop-down menus are block elements, while button drop-down menus are inline-block elements. This article will introduce the Bootstrap button drop-down menu in detail
Overview
The button drop-down menu is actually an ordinary drop-down menu. The only difference is the external container "div.dropdown" Changed to "div.btn-group", the display changed from block to inline-block
<div> <button>按钮式下拉菜单 <span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> <li> <li><a>Separated link</a></li> </ul> </div><div> <button>普通下拉菜单 <span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> <li> <li><a>Separated link</a></li> </ul> </div>
Pop up
Some menus need to pop up. For example, the menu is at the bottom of the page, and this menu happens to have a drop-down menu. In order to give users a better experience, the drop-down menu has to pop up. In the Bootstrap framework, a class name "dropup" is specially proposed for this effect. You only need to add this class name to "btn-group"
[Triangle]
Button The default downward triangle is created by adding a "" tag element to the
按钮下拉菜单
This triangle is completely created by CSS code to achieve
.caret {
display: inline-block;
width: 0;
height: 0;
margin-left: 2px;
vertical-align: middle;
border-top: 4px solid;
border-right: 4px solid transparent;
border-left: 4px solid transparent;
}In addition, the triangle "caret" in the button has been styled to a certain extent:
.btn .caret {
margin-left: 0;
}.btn-lg .caret {
border-width: 5px 5px 0;
border-bottom-width: 0;
}.dropup .btn-lg .caret {
border-width: 0 5px 5px;
}If the triangle direction To display upward, you need to append the "dropup" class name to the ".btn-group" class. It can be seen that the difference between the upward triangle and the downward triangle: In fact, it changes the value of a border-bottom
.dropup .caret,
.navbar-fixed-bottom .dropdown .caret {
content: "";
border-top: 0;
border-bottom: 4px solid;
}<div> <button>按钮下拉菜单<span></span></button><ul> <li><a>按钮下拉菜单项</a></li> <li><a>按钮下拉菜单项</a></li> <li><a>按钮下拉菜单项</a></li> <li><a>按钮下拉菜单项</a></li> </ul> </div>
Split
The split button drop-down menu is actually an artificial combination of buttons and The triangle is split, leaving only one separate button in the end
<div> <button>Action</button> <button><span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> <li> <li><a>Separated link</a></li> </ul> </div>
<div> <button>Extra small button <span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> </ul> </div><div> <button>Large button <span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> </ul> </div><div> <button>small button <span></span> </button> <ul> <li><a>Action</a></li> <li><a>Another action</a></li> <li><a>Something else here</a></li> </ul> </div>
The above is the detailed content of Bootstrap button drop-down menu example tutorial. For more information, please follow other related articles on the PHP Chinese website!
What are self-closing tags? Give an example.Apr 27, 2025 am 12:04 AMSelf-closingtagsinHTMLandXMLaretagsthatclosethemselveswithoutneedingaseparateclosingtag,simplifyingmarkupstructureandenhancingcodingefficiency.1)TheyareessentialinXMLforelementswithoutcontent,ensuringwell-formeddocuments.2)InHTML5,usageisflexiblebutr
Beyond HTML: Essential Technologies for Web DevelopmentApr 26, 2025 am 12:04 AMTo build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.
What are boolean attributes in HTML? Give some examples.Apr 25, 2025 am 12:01 AMBoolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.
How can you validate your HTML code?Apr 24, 2025 am 12:04 AMHTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.
HTML vs. CSS and JavaScript: Comparing Web TechnologiesApr 23, 2025 am 12:05 AMHTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.
HTML as a Markup Language: Its Function and PurposeApr 22, 2025 am 12:02 AMThe function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.
The Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AMThe future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.
HTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Atom editor mac version download
The most popular open source editor
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.
Dreamweaver CS6
Visual web development tools
SublimeText3 Chinese version
Chinese version, very easy to use
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
