A brief discussion on drop-down menu events in Bootstrap3-Bootstrap Tutorial-php.cn

Home

Web Front-end

Bootstrap Tutorial

A brief discussion on drop-down menu events in Bootstrap3

青灯夜游

Mar 25, 2021 am 10:55 AM

bootstrapDrop-down menuevent

This article takes you through the events of the Bootstrap3 drop-down menu. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

A brief discussion on drop-down menu events in Bootstrap3

Bootstrap provides 4 events for the drop-down menu plug-in. By listening to these events, you can control specific Respond to user actions during the operation phase. These events and their meanings are shown in Table 4‑3.

Table 4‑3 Events and meanings of dropdown plug-in
Event	Meaning
show.bs.dropdown	After the show method is called, this event is triggered immediately
shown.bs.dropdown	This event is triggered when the drop-down menu is visible to the user (and the transition effect is completed)
hide.bs.dropdown	After the hide method is called, this event is triggered immediately Event
hidden.bs.dropdown	This event is triggered after the drop-down menu has been hidden (and the transition effect is completed)

Related recommendations: "bootstrap Tutorial"

If developers want to customize the functions of the drop-down menu, they can listen to these events through JavaScript to perform corresponding operations. Such as:

<script>
  $(&#39;#myDropdown&#39;).on(&#39;show.bs.dropdown&#39;, function () {
   alert("开始显示下拉菜单。");
  });
  $(&#39;#myDropdown&#39;).on(&#39;shown.bs.dropdown&#39;, function () {
     alert("下拉菜单已经显示。");
  });
  $(&#39;#myDropdown&#39;).on(&#39;hide.bs.dropdown&#39;, function () {
     alert("开始隐藏下拉菜单。");
  });
  $(&#39;#myDropdown&#39;).on(&#39;hidden.bs.dropdown&#39;, function () {
     alert("下拉菜单已经隐藏。");
  });
</script>

For more programming-related knowledge, please visit: Programming Video! !

The above is the detailed content of A brief discussion on drop-down menu events in Bootstrap3. For more information, please follow other related articles on the PHP Chinese website!

Statement

This article is reproduced at:csdn. If there is any infringement, please contact admin@php.cn delete

How to center navbar items in Bootstrap?Jul 23, 2025 am 02:43 AM

To center the Bootstrap navigation bar project horizontally, it is recommended to use the Flexbox method. 1. Add mx-auto class to .navbar-nav to center the navigation bar content horizontally in the container and ensure that the parent element width is sufficient; 2. Or set .navbar-nav to flex layout through custom CSS and use justify-content:center to achieve center; 3. Pay attention to keeping the container width full of one row, avoid multiple .navbar-nav interference, and handle the mobile folding menu style separately to ensure compatibility.

How to make a transparent navbar in Bootstrap?Jul 23, 2025 am 02:23 AM

The core of implementing a transparent navigation bar in Bootstrap is to clear the default style and adjust the color and layout. First, set the background color to be transparent and remove shadows and borders. Second, deal with the background changes that may be triggered during scrolling, then set the link color and hover effect according to the background. Finally, if you use fixed positioning, you need to add a top margin to the body to avoid the content being blocked. 1. Set the background-color of .navbar to transparent and remove box-shadow and border; 2. If using Bootstrap5, check and remove bg-light or bg-dark classes; 3. Add .navbar.scrolled style to ensure scrolling

How to customize Bootstrap navbar with CSS?Jul 23, 2025 am 01:32 AM

TocustomizeaBootstrapnavbarwithCSS,followthesekeysteps:1.Changebackgroundandtextcolorbyoverriding.navbarand.navbar-nav.nav-linkstylesorusingCSSvariables.2.Adjustspacingwithpaddingon.navbar-brandand.nav-link,andalignitemsusingflexboxutilitieslikejusti

How to use SASS to customize the Bootstrap navbar?Jul 23, 2025 am 01:31 AM

TocustomizeaBootstrapnavbarusingSASS,youcanleveragevariables,customstyles,andSASSmaps.1.OverrideBootstrap’sSASSvariablessuchas$navbar-light-bgand$navbar-padding-yina\_custom-variables.scssfilebeforeimportingBootstrap.2.WritecustomSASSrulestargetingel

Bootstrap 5 offcanvas navbar exampleJul 22, 2025 am 01:28 AM

How to create and optimize OffcanvasNavbar for Bootstrap5? 1. Use the built-in offcanvas component to combine navbar, and build the basic structure by adding key categories such as navbar-expand-lg, offcanvas, data-bs-toggle, etc.; 2. In order to make offcanvas better adapt to different devices, use the d-lg-none control button to only display on the small screen, and cooperate with navbar-expand-lg to control navigation responsive expansion; 3. Frequently asked questions to optimize the optimization of the menu item: add data-bs-dismiss to achieve automatic closing of offcanvas after clicking, and add bg-da

How to create a double row navbar in Bootstrap?Jul 22, 2025 am 01:05 AM

The core method of implementing a dual-row navigation bar in Bootstrap is to combine structures and style adjustments. 1. Use nested containers to build a double-row structure, use two independent .navbars or .containers to place the top and bottom navigation content respectively, the first line places secondary information such as language switching and contact information, and the second line is used as the main menu; 2. Use Flex layout to merge into a container, set d-flexflex-column through the outer div to achieve vertical stacking, and manage styles and widths uniformly; 3. Optimization details include controlling spacing, responsive hiding the first line content, style isolation, and color matching coordination. These steps allow for a clear structure and responsive and friendly dual-line navigation bar.

Bootstrap Grid System: differences between versionsJul 22, 2025 am 12:13 AM

Bootstrap'sGridSystemevolvedsignificantlyfromversion2to5,enhancingresponsivenessandflexibility.1)Bootstrap3introducedafluid12-columngridforbettermobileadaptability.2)Bootstrap4refinedthiswithflexboxandremovedthexstierforeasiersmall-screendesign.3)Boo

How to add a logo to the Bootstrap navbar?Jul 22, 2025 am 12:04 AM

Four key points to follow to add a logo in the Bootstrap navigation bar. 1. Use navbar-brand to wrap logo images, it is recommended to set width and height or use img-fluid class to maintain responsiveness; 2. Use custom CSS to adjust the size and position of the logo, such as max-height and object-fit:contain, and use ms-auto to control the alignment; 3. Use responsive tool classes such as d-noned-md-inline-block to display logos of different sizes to optimize the mobile experience; 4. Coordinate the layout and make sure to use container-fluid and check navbar-n

See all articles