Bootstrap 5 Dropdowns Events Last Updated : 06 Aug, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In this article, we will learn about the Bootstrap 5 Dropdowns events fired when interacting with the Bootstrap 5 dropdown. For example, these events are fired when an off-canvas element is toggled to be visible or hidden.Bootstrap 5 dropdowns are dropdown overlay menus that can be used to display a list of items or content when triggered with a target element, which is often a button. Bootstrap 5 Dropdowns events:show.bs.dropdown: It is fired when the show instance method of the dropdown is called.shown.bs.dropdown: It is fired when the dropdown is completely visible to the user after all the CSS transitions are done.hide.bs.dropdown: It is fired when the hide instance method of the dropdown is called.hidden.bs.dropdown: It is fired when the dropdown is completely hidden from the user after all the CSS transitions are done.Syntax:dropdownsEl.addEventListener(dropdowns_event, callbackFunction);Example 1: In this example, we will listen for the dropdown events that get fired when the dropdown is toggled to be visible. HTML <!DOCTYPE html> <html lang="en"> <head> <link href= "https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity= "sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous"> <script src= "https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity= "sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"> </script> </head> <body class="m-2"> <h1 style="color:green">GeeksforGeeks</h1> <div class="dropdown"> <button class="btn btn-secondary dropdown-toggle" id="dropdown" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false"> GFG Dropdown </button> <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1"> <li><a class="dropdown-item" href="#"> label 1 </a> </li> <li><a class="dropdown-item" href="#"> label 2 </a> </li> <li><a class="dropdown-item" href="#"> label 3 </a> </li> </ul> </div> <script> const btn = document.getElementById('btn') const dropdownPr = document.getElementsByClassName('dropdown')[0] dropdownPr.addEventListener('show.bs.dropdown', () => { console.log('show instance method called'); }) dropdownPr.addEventListener('shown.bs.dropdown', () => { console.log('dropdown completely visible'); }) </script> </body> </html> Output: Example 2: In this example, we will listen for the dropdown events that get fired when the dropdown is toggled to be hidden. HTML <!DOCTYPE html> <html lang="en"> <head> <link href= "https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity= "sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous"> <script src= "https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity= "sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"> </script> </head> <body class="m-2"> <div class="dropdown"> <button class="btn btn-secondary dropdown-toggle" id="dropdown" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false"> GFG Dropdown </button> <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1"> <li> <a class="dropdown-item" href="#"> label 1 </a> </li> <li> <a class="dropdown-item" href="#"> label 2 </a> </li> <li> <a class="dropdown-item" href="#"> label 3 </a> </li> </ul> </div> <script> const btn = document.getElementById('btn') const dropdownPr = document.getElementsByClassName('dropdown')[0] dropdownPr.addEventListener('hide.bs.dropdown', () => { console.log('hide instance method called'); }) dropdownPr.addEventListener('hidden.bs.dropdown', () => { console.log('dropdown completely hidden'); }) </script> </body> </html> Output: Reference: https://getbootstrap.com/docs/5.0/components/dropdowns/#events Comment More infoAdvertise with us D dishebhbhayana Follow Improve Article Tags : Technical Scripter Web Technologies Bootstrap Technical Scripter 2022 Bootstrap-5 +1 More Similar Reads Bootstrap 5 Dropdowns Single Button Bootstrap 5 Dropdowns Single button is used to turn a button into a dropdown toggle with some basic markup. 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