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101 lines
3.1 KiB
Markdown
101 lines
3.1 KiB
Markdown
---
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layout: page
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title: Dropdowns
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---
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Toggleable, contextual menu for displaying lists of links. Made interactive with the [dropdown JavaScript plugin]({{ site.bsaeurl }}javascript/#dropdowns).
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### Example
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Wrap the dropdown's trigger and the dropdown menu within `.dropdown`, or another element that declares `position: relative;`. Then add the menu's HTML.
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{% example html %}
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<div class="dropdown">
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<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
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Dropdown
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</button>
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<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Action</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Another action</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Something else here</a>
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</li>
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</ul>
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</div>
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{% endexample %}
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### Alignment
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By default, a dropdown menu is automatically positioned 100% from the top and along the left side of its parent. Add `.dropdown-menu-right` to a `.dropdown-menu` to right align the dropdown menu.
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<div class="bs-callout bs-callout-warning">
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<h4>May require additional positioning</h4>
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<p>Dropdowns are automatically positioned via CSS within the normal flow of the document. This means dropdowns may be cropped by parents with certain <code>overflow</code> properties or appear out of bounds of the viewport. Address these issues on your own as they arise.</p>
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</div>
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{% highlight html %}
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<ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="dLabel">
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...
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</ul>
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{% endhighlight %}
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### Menu headers
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Add a header to label sections of actions in any dropdown menu.
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{% example html %}
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<ul class="dropdown-menu" role="menu">
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<li role="presentation" class="dropdown-header">Dropdown header</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Action</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Another action</a>
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</li>
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</ul>
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{% endexample %}
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### Menu dividers
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Separate groups of related menu items with a divider.
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{% example html %}
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<ul class="dropdown-menu" role="menu">
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Action</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Another action</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Something else here</a>
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</li>
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<li role="presentation" class="dropdown-divider"></li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Separated link</a>
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</li>
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</ul>
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{% endexample %}
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### Disabled menu items
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Add `.disabled` to a `<li>` in the dropdown to disable the link.
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{% example html %}
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<ul class="dropdown-menu" role="menu">
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Regular link</a>
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</li>
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<li role="presentation" class="disabled">
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<a role="menuitem" tabindex="-1" href="#">Disabled link</a>
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</li>
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<li role="presentation">
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<a role="menuitem" tabindex="-1" href="#">Another link</a>
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</li>
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</ul>
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{% endexample %}
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