From 54fa28441c5f0bdcd9687615f4a6b7a0fab024a3 Mon Sep 17 00:00:00 2001
From: Mario Vavti <mario@mariovavti.com>
Date: Fri, 7 Sep 2018 11:26:02 +0200
Subject: install bootstrap via composer

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+---
+layout: docs
+title: Buttons
+description: Use Bootstrap's custom button styles for actions in forms, dialogs, and more with support for multiple sizes, states, and more.
+group: components
+redirect_from: "/docs/4.1/components/"
+toc: true
+---
+
+## Examples
+
+Bootstrap includes several predefined button styles, each serving its own semantic purpose, with a few extras thrown in for more control.
+
+{% capture example %}
+{% for color in site.data.theme-colors %}
+<button type="button" class="btn btn-{{ color.name }}">{{ color.name | capitalize }}</button>{% endfor %}
+
+<button type="button" class="btn btn-link">Link</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+{% include callout-warning-color-assistive-technologies.md %}
+
+## Button tags
+
+The `.btn` classes are designed to be used with the `<button>` element. However, you can also use these classes on `<a>` or `<input>` elements (though some browsers may apply a slightly different rendering).
+
+When using button classes on `<a>` elements that are used to trigger in-page functionality (like collapsing content), rather than linking to new pages or sections within the current page, these links should be given a `role="button"` to appropriately convey their purpose to assistive technologies such as screen readers.
+
+{% capture example %}
+<a class="btn btn-primary" href="#" role="button">Link</a>
+<button class="btn btn-primary" type="submit">Button</button>
+<input class="btn btn-primary" type="button" value="Input">
+<input class="btn btn-primary" type="submit" value="Submit">
+<input class="btn btn-primary" type="reset" value="Reset">
+{% endcapture %}
+{% include example.html content=example %}
+
+## Outline buttons
+
+In need of a button, but not the hefty background colors they bring? Replace the default modifier classes with the `.btn-outline-*` ones to remove all background images and colors on any button.
+
+{% capture example %}
+{% for color in site.data.theme-colors %}
+<button type="button" class="btn btn-outline-{{ color.name }}">{{ color.name | capitalize }}</button>{% endfor %}
+{% endcapture %}
+{% include example.html content=example %}
+
+## Sizes
+
+Fancy larger or smaller buttons? Add `.btn-lg` or `.btn-sm` for additional sizes.
+
+{% capture example %}
+<button type="button" class="btn btn-primary btn-lg">Large button</button>
+<button type="button" class="btn btn-secondary btn-lg">Large button</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+{% capture example %}
+<button type="button" class="btn btn-primary btn-sm">Small button</button>
+<button type="button" class="btn btn-secondary btn-sm">Small button</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+Create block level buttons—those that span the full width of a parent—by adding `.btn-block`.
+
+{% capture example %}
+<button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button>
+<button type="button" class="btn btn-secondary btn-lg btn-block">Block level button</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+## Active state
+
+Buttons will appear pressed (with a darker background, darker border, and inset shadow) when active. **There's no need to add a class to `<button>`s as they use a pseudo-class**. However, you can still force the same active appearance with `.active` (and include the <code>aria-pressed="true"</code> attribute) should you need to replicate the state programmatically.
+
+{% capture example %}
+<a href="#" class="btn btn-primary btn-lg active" role="button" aria-pressed="true">Primary link</a>
+<a href="#" class="btn btn-secondary btn-lg active" role="button" aria-pressed="true">Link</a>
+{% endcapture %}
+{% include example.html content=example %}
+
+## Disabled state
+
+Make buttons look inactive by adding the `disabled` boolean attribute to any `<button>` element.
+
+{% capture example %}
+<button type="button" class="btn btn-lg btn-primary" disabled>Primary button</button>
+<button type="button" class="btn btn-secondary btn-lg" disabled>Button</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+Disabled buttons using the `<a>` element behave a bit different:
+
+- `<a>`s don't support the `disabled` attribute, so you must add the `.disabled` class to make it visually appear disabled.
+- Some future-friendly styles are included to disable all `pointer-events` on anchor buttons. In browsers which support that property, you won't see the disabled cursor at all.
+- Disabled buttons should include the `aria-disabled="true"` attribute to indicate the state of the element to assistive technologies.
+
+{% capture example %}
+<a href="#" class="btn btn-primary btn-lg disabled" tabindex="-1" role="button" aria-disabled="true">Primary link</a>
+<a href="#" class="btn btn-secondary btn-lg disabled" tabindex="-1" role="button" aria-disabled="true">Link</a>
+{% endcapture %}
+{% include example.html content=example %}
+
+{% capture callout %}
+##### Link functionality caveat
+
+The `.disabled` class uses `pointer-events: none` to try to disable the link functionality of `<a>`s, but that CSS property is not yet standardized. In addition, even in browsers that do support `pointer-events: none`, keyboard navigation remains unaffected, meaning that sighted keyboard users and users of assistive technologies will still be able to activate these links. So to be safe, add a `tabindex="-1"` attribute on these links (to prevent them from receiving keyboard focus) and use custom JavaScript to disable their functionality.
+{% endcapture %}
+{% include callout.html content=callout type="warning" %}
+
+## Button plugin
+
+Do more with buttons. Control button states or create groups of buttons for more components like toolbars.
+
+### Toggle states
+
+Add `data-toggle="button"` to toggle a button's `active` state. If you're pre-toggling a button, you must manually add the `.active` class **and** `aria-pressed="true"` to the `<button>`.
+
+{% capture example %}
+<button type="button" class="btn btn-primary" data-toggle="button" aria-pressed="false" autocomplete="off">
+  Single toggle
+</button>
+{% endcapture %}
+{% include example.html content=example %}
+
+### Checkbox and radio buttons
+
+Bootstrap's `.button` styles can be applied to other elements, such as `<label>`s, to provide checkbox or radio style button toggling. Add `data-toggle="buttons"` to a `.btn-group` containing those modified buttons to enable their toggling behavior via JavaScript and add `.btn-group-toggle` to style the `<input>`s within your buttons. **Note that you can create single input-powered buttons or groups of them.**
+
+The checked state for these buttons is **only updated via `click` event** on the button. If you use another method to update the input—e.g., with `<input type="reset">` or by manually applying the input's `checked` property—you'll need to toggle `.active` on the `<label>` manually.
+
+Note that pre-checked buttons require you to manually add the `.active` class to the input's `<label>`.
+
+{% capture example %}
+<div class="btn-group-toggle" data-toggle="buttons">
+  <label class="btn btn-secondary active">
+    <input type="checkbox" checked autocomplete="off"> Checked
+  </label>
+</div>
+{% endcapture %}
+{% include example.html content=example %}
+
+{% capture example %}
+<div class="btn-group btn-group-toggle" data-toggle="buttons">
+  <label class="btn btn-secondary active">
+    <input type="radio" name="options" id="option1" autocomplete="off" checked> Active
+  </label>
+  <label class="btn btn-secondary">
+    <input type="radio" name="options" id="option2" autocomplete="off"> Radio
+  </label>
+  <label class="btn btn-secondary">
+    <input type="radio" name="options" id="option3" autocomplete="off"> Radio
+  </label>
+</div>
+{% endcapture %}
+{% include example.html content=example %}
+
+### Methods
+
+| Method | Description |
+| --- | --- |
+| `$().button('toggle')` | Toggles push state. Gives the button the appearance that it has been activated. |
+| `$().button('dispose')` | Destroys an element's button. |
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