Bootstrap 4 Tutorial

Bootstrap JS Dropdown

Last modified on: October 27, 2024

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<h2 class="relative p-1 rounded-sm flex items-center justify-center bg-token-main-surface-primary text-token-text-primary h-8 w-8">Bootstrap 4 JavaScript Dropdown</h2>
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<p>The Bootstrap 4 Dropdown component creates interactive menus that appear when the user clicks or hovers over an element, making it a versatile tool for navigation, selections, and additional actions in a user interface.</p>
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<h3>1. Basic Dropdown Example</h3>
<p>Here&rsquo;s how to create a simple dropdown menu:</p>
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<pre class="language-markup"><code>&lt;div class="dropdown"&gt;
  &lt;button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"&gt;
    Dropdown Button
  &lt;/button&gt;
  &lt;div class="dropdown-menu" aria-labelledby="dropdownMenuButton"&gt;
    &lt;a class="dropdown-item" href="#"&gt;Action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Another action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Something else here&lt;/a&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>
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<ul>
<li><strong>Explanation</strong>:
<ul>
<li><code>data-toggle="dropdown"</code>: Enables the dropdown functionality.</li>
<li><code>dropdown-toggle</code>: Adds styling and a downward-facing arrow to the button.</li>
<li><code>.dropdown-menu</code>: Contains the dropdown items.</li>
<li><code>.dropdown-item</code>: Styles each item in the dropdown menu.</li>
</ul>
</li>
</ul>
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<h3>2. Split Button Dropdown</h3>
<p>A split button dropdown includes a primary button and a dropdown button for additional options.</p>
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<pre class="language-markup"><code>&lt;div class="btn-group"&gt;
  &lt;button type="button" class="btn btn-primary"&gt;Primary Action&lt;/button&gt;
  &lt;button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"&gt;
    &lt;span class="sr-only"&gt;Toggle Dropdown&lt;/span&gt;
  &lt;/button&gt;
  &lt;div class="dropdown-menu"&gt;
    &lt;a class="dropdown-item" href="#"&gt;Action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Another action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Something else here&lt;/a&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>
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<ul>
<li><strong>Explanation</strong>:
<ul>
<li><code>.dropdown-toggle-split</code>: Creates a split button style, separating the primary button from the dropdown toggle.</li>
<li><code>sr-only</code>: Hides text visually but keeps it accessible to screen readers.</li>
</ul>
</li>
</ul>
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<h3>3. Dropdown Alignment</h3>
<p>You can align the dropdown menu to the right of the toggle by adding <code>.dropdown-menu-right</code> to the dropdown menu.</p>
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<pre class="language-markup"><code>&lt;div class="dropdown"&gt;
  &lt;button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButtonRight" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"&gt;
    Right-Aligned Dropdown
  &lt;/button&gt;
  &lt;div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdownMenuButtonRight"&gt;
    &lt;a class="dropdown-item" href="#"&gt;Action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Another action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Something else here&lt;/a&gt;
  &lt;/div&gt;
&lt;/div&gt;
</code></pre>
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<h3>4. JavaScript Control for Dropdowns</h3>
<p>Bootstrap provides JavaScript methods for manually toggling and controlling dropdowns:</p>
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<pre class="language-markup"><code>&lt;button onclick="toggleDropdown()" class="btn btn-info"&gt;Toggle Dropdown with JavaScript&lt;/button&gt;

&lt;div class="dropdown"&gt;
  &lt;button class="btn btn-secondary dropdown-toggle" type="button" id="jsDropdown" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"&gt;
    JavaScript Dropdown
  &lt;/button&gt;
  &lt;div class="dropdown-menu" aria-labelledby="jsDropdown"&gt;
    &lt;a class="dropdown-item" href="#"&gt;Action&lt;/a&gt;
    &lt;a class="dropdown-item" href="#"&gt;Another action&lt;/a&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;script&gt;
  function toggleDropdown() {
    $('#jsDropdown').dropdown('toggle'); // Toggles the dropdown
  }
&lt;/script&gt;
</code></pre>
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<ul>
<li><strong>Methods</strong>:
<ul>
<li><code>toggle</code>: Opens or closes the dropdown.</li>
<li><code>show</code>: Opens the dropdown.</li>
<li><code>hide</code>: Closes the dropdown.</li>
</ul>
</li>
</ul>
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<h3>&nbsp;</h3>
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