You need to use JavaScript to bind the Bootstrap drop-down box, follow these steps: Introduce the Bootstrap JavaScript library. Instantiate the drop-down element using the Dropdown class. Bind event handlers such as show.bs.dropdown and hidden.bs.dropdown. Call methods of the Dropdown class (such as show() and hide()) to control the behavior of the dropdown box.

Bootstrap using JavaScript to bind drop-down boxes

Bootstrap provides simple and easy-to-use components, including drop-down boxes. To bind the drop-down box using JavaScript, use the following steps:

1. Introducing Bootstrap JavaScript

In the HTML page, introduce the Bootstrap JavaScript library:

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js"></script>

2. Instantiate the drop-down box

Find the dropdown element you want to bind to, and instantiate it using Bootstrap's Dropdown class:

 <code class="javascript">const dropdown = new bootstrap.Dropdown(document.getElementById('dropdown-element'));</code>

3. Bind event handler

You can bind various event handlers to the drop-down box as needed. Here are some examples:

• show.bs.dropdown : Triggered before the drop-down box is displayed
• show.bs.dropdown : Triggered after the drop-down box is displayed
• hide.bs.dropdown : Triggered before the drop-down box is hidden
• hidden.bs.dropdown : Triggered after the drop-down box is hidden

To bind these events, use on() method:

 <code class="javascript">dropdown.on('show.bs.dropdown', (e) => { // 在此添加要執(zhí)行的操作}); dropdown.on('hidden.bs.dropdown', (e) => { // 在此添加要執(zhí)行的操作});</code>

4. Call the drop-down box method

You can use the Dropdown class method to control the behavior of the dropdown box. Here are some examples:

• show() : Show drop-down box
• hide() : Hide the drop-down box
• toggle() : Toggle the display/hidden state of the drop-down box
• dispose() : destroy the drop-down box instance

To call these methods, use the following syntax:

 <code class="javascript">dropdown.show(); dropdown.hide(); dropdown.toggle(); dropdown.dispose();</code>

By following these steps, you can easily bind and control the drop-down boxes in Bootstrap using JavaScript.

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