Bootstrap 3 Tutorial

Bootstrap 3 Dropdowns

Last modified on: October 28, 2024

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<h3>Bootstrap 3: Dropdowns</h3>
<p><strong>Dropdowns</strong> in Bootstrap 3 are versatile components used to create a toggleable menu that can display a list of links or actions. They are commonly used in navigation bars and other UI elements where space is limited.</p>
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<h3>Basic Usage of Dropdowns</h3>
<p>To create a dropdown, you can use the <code>.dropdown</code> class along with additional classes to define its structure and behavior. A typical dropdown consists of a button that toggles the visibility of the dropdown menu.</p>
<h4>Example of a Basic Dropdown</h4>
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<pre class="language-markup"><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
    &lt;title&gt;Bootstrap 3 Dropdown Example&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"&gt;
&lt;/head&gt;
&lt;body&gt;

&lt;div class="container"&gt;
    &lt;h2&gt;Bootstrap 3 Dropdowns&lt;/h2&gt;

&lt;div class="dropdown"&gt;
        &lt;button class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenu" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"&gt;
            Dropdown Menu &lt;span class="caret"&gt;&lt;/span&gt;
        &lt;/button&gt;
        &lt;ul class="dropdown-menu" aria-labelledby="dropdownMenu"&gt;
            &lt;li&gt;&lt;a href="#"&gt;Action 1&lt;/a&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Action 2&lt;/a&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Action 3&lt;/a&gt;&lt;/li&gt;
            &lt;li role="separator" class="divider"&gt;&lt;/li&gt;
            &lt;li&gt;&lt;a href="#"&gt;Another Action&lt;/a&gt;&lt;/li&gt;
        &lt;/ul&gt;
    &lt;/div&gt;
&lt;/div&gt;

&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"&gt;&lt;/script&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
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<h3>Key Features of Bootstrap 3 Dropdowns</h3>
<ol>
<li><strong>Toggle Button</strong>: The dropdown is triggered by a button, which can include the <code>.dropdown-toggle</code> class.</li>
<li><strong>Dropdown Menu</strong>: The menu is defined by the <code>&lt;ul&gt;</code> element with the <code>.dropdown-menu</code> class, containing individual list items (<code>&lt;li&gt;</code>) for each action or link.</li>
<li><strong>Accessibility</strong>: The <code>aria-*</code> attributes enhance accessibility, helping screen readers understand the dropdown structure.</li>
<li><strong>Divider</strong>: You can create visual separators in the dropdown using the <code>role="separator"</code> class with the <code>.divider</code> class.</li>
<li><strong>Responsive</strong>: Dropdowns automatically adjust for responsive layouts.</li>
</ol>
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<h3>Example with Nested Dropdowns</h3>
<p>You can also create nested dropdowns for more complex menus:</p>
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<div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between rounded-t-md h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary">html</div>
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<div class="absolute bottom-0 right-2 flex h-9 items-center">
<div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary">
<pre class="language-markup"><code>&lt;div class="dropdown"&gt;
    &lt;button class="btn btn-primary dropdown-toggle" type="button" id="nestedDropdownMenu" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"&gt;
        Nested Dropdown &lt;span class="caret"&gt;&lt;/span&gt;
    &lt;/button&gt;
    &lt;ul class="dropdown-menu" aria-labelledby="nestedDropdownMenu"&gt;
        &lt;li&gt;&lt;a href="#"&gt;Item 1&lt;/a&gt;&lt;/li&gt;
        &lt;li class="dropdown-submenu"&gt;
            &lt;a tabindex="-1" href="#"&gt;Submenu&lt;/a&gt;
            &lt;ul class="dropdown-menu"&gt;
                &lt;li&gt;&lt;a href="#"&gt;Sub Item 1&lt;/a&gt;&lt;/li&gt;
                &lt;li&gt;&lt;a href="#"&gt;Sub Item 2&lt;/a&gt;&lt;/li&gt;
            &lt;/ul&gt;
        &lt;/li&gt;
        &lt;li&gt;&lt;a href="#"&gt;Item 3&lt;/a&gt;&lt;/li&gt;
    &lt;/ul&gt;
&lt;/div&gt;
</code></pre>
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<h3>&nbsp;</h3>
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<h3>Conclusion</h3>
<p>Bootstrap 3 Dropdowns are an essential component for creating interactive menus in web applications. Their ease of use and customization options make them a powerful tool for enhancing user experience and navigation. Whether you need simple action menus or complex nested structures, Bootstrap 3 Dropdowns can help you organize your interface effectively.</p>

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