How to bind bootstrap frame

Bootstrap drop-down boxes can be bound using jQuery or pure JavaScript. Using jQuery, load the jQuery library and bind the dropdown box: $(function() { $('#dropdown').on('show.bs.dropdown', function() { // Binding event handler}); }); Using pure JavaScript, get the dropdown box element and bind the event listener: const dropdown = document.getElementById('dropdown'); dropdown

How to bind a drop-down box using Bootstrap

The drop-down box of Bootstrap is a component that allows the user to select one or more items from the list of options. To bind a drop-down box, you can use a JavaScript framework such as jQuery or pure JavaScript.

Using jQuery

1. Load the jQuery library

Make sure the jQuery library is loaded in the webpage.

2. Bind the drop-down box

 <code class="javascript">$(function() { $('#dropdown').on('show.bs.dropdown', function() { // 绑定事件处理程序}); });</code>

Using Pure JavaScript

1. Get the drop-down box element

 <code class="javascript">const dropdown = document.getElementById('dropdown');</code>

2. Bind event listener

 <code class="javascript">dropdown.addEventListener('show.bs.dropdown', function(event) { // 绑定事件处理程序});</code>

Binding event handler

The event handler will be fired when the drop-down box is displayed. Here you can execute the logic you want, such as:

• Load data asynchronously and fill drop-down box options
• Verify the selected options
• Respond to user input

Example

 <code class="javascript">$('#dropdown').on('show.bs.dropdown', function() { // 使用AJAX 加载数据$.ajax({ url: 'data.json', success: function(data) { // 填充下拉框选项$.each(data, function(index, value) { $('#dropdown').append($('<option>').val(value).text(value)); }); } }); });</option></code>

By following these steps, you can use Bootstrap to bind the drop-down box and customize its behavior as needed.

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