Offcanvas
Zabudujte do svého projektu skryté postranní panely pro navigaci, nákupní košíky a další pomocí několika tříd a našeho pluginu JavaScript.
Jak to funguje
Offcanvas je komponenta postranního panelu, kterou lze pomocí JavaScriptu přepínat tak, aby se zobrazovala z levého, pravého nebo spodního okraje výřezu. Tlačítka nebo kotvy se používají jako spouštěče, které jsou připojeny ke konkrétním prvkům, které přepínáte, a data
atributy se používají k vyvolání našeho JavaScriptu.
- Offcanvas sdílí některé ze stejného kódu JavaScript jako modály. Koncepčně jsou si dost podobné, ale jedná se o samostatné pluginy.
- Podobně některé zdrojové proměnné Sass pro styly a rozměry offcanvas jsou zděděny z proměnných modalu.
- Když se zobrazí, offcanvas obsahuje výchozí pozadí, na které lze kliknout a skrýt offcanvas.
- Podobně jako u modalů lze současně zobrazit pouze jedno mimo plátno.
Hlavy vzhůru! Vzhledem k tomu, jak CSS zpracovává animace, nemůžete použít margin
nebo translate
na .offcanvas
prvek. Místo toho použijte třídu jako nezávislý prvek obtékání.
prefers-reduced-motion
dotazu na média. Podívejte se na
část s omezeným pohybem v naší dokumentaci přístupnosti .
Příklady
Offcanvas komponenty
Níže je uveden příklad offcanvas, který je zobrazen ve výchozím nastavení (přes .show
) .offcanvas
. Offcanvas obsahuje podporu pro záhlaví s tlačítkem pro zavření a volitelnou třídu těla pro některé počáteční soubory padding
. Doporučujeme, abyste zahrnuli záhlaví offcanvas s akcemi zavření, kdykoli je to možné, nebo poskytli explicitní akci zavření.
Offcanvas
<div class="offcanvas offcanvas-start" tabindex="-1" id="offcanvas" aria-labelledby="offcanvasLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasLabel">Offcanvas</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
Content for the offcanvas goes here. You can place just about any Bootstrap component or custom elements here.
</div>
</div>
Živé demo
Pomocí tlačítek níže můžete zobrazit a skrýt prvek offcanvas prostřednictvím JavaScriptu, který přepíná .show
třídu na prvku s .offcanvas
třídou.
.offcanvas
skryje obsah (výchozí).offcanvas.show
zobrazuje obsah
Můžete použít odkaz s href
atributem nebo tlačítko s data-bs-target
atributem. V obou případech data-bs-toggle="offcanvas"
je požadováno.
Offcanvas
<a class="btn btn-primary" data-bs-toggle="offcanvas" href="#offcanvasExample" role="button" aria-controls="offcanvasExample">
Link with href
</a>
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasExample" aria-controls="offcanvasExample">
Button with data-bs-target
</button>
<div class="offcanvas offcanvas-start" tabindex="-1" id="offcanvasExample" aria-labelledby="offcanvasExampleLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasExampleLabel">Offcanvas</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<div>
Some text as placeholder. In real life you can have the elements you have chosen. Like, text, images, lists, etc.
</div>
<div class="dropdown mt-3">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-bs-toggle="dropdown">
Dropdown button
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</div>
</div>
</div>
Umístění
Pro komponenty offcanvas neexistuje žádné výchozí umístění, takže musíte přidat jednu z níže uvedených tříd modifikátorů;
.offcanvas-start
umístí mimo plátno nalevo od výřezu (zobrazeno výše).offcanvas-end
umístí mimo plátno napravo od výřezu.offcanvas-top
umístí mimo plátno v horní části výřezu.offcanvas-bottom
umístí mimo plátno na spodní část výřezu
Vyzkoušejte příklady nahoře, vpravo a dole níže.
Offcanvas top
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasTop" aria-controls="offcanvasTop">Toggle top offcanvas</button>
<div class="offcanvas offcanvas-top" tabindex="-1" id="offcanvasTop" aria-labelledby="offcanvasTopLabel">
<div class="offcanvas-header">
<h5 id="offcanvasTopLabel">Offcanvas top</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
...
</div>
</div>
Offcanvas vpravo
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasRight" aria-controls="offcanvasRight">Toggle right offcanvas</button>
<div class="offcanvas offcanvas-end" tabindex="-1" id="offcanvasRight" aria-labelledby="offcanvasRightLabel">
<div class="offcanvas-header">
<h5 id="offcanvasRightLabel">Offcanvas right</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
...
</div>
</div>
Spodní část z plátna
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasBottom" aria-controls="offcanvasBottom">Toggle bottom offcanvas</button>
<div class="offcanvas offcanvas-bottom" tabindex="-1" id="offcanvasBottom" aria-labelledby="offcanvasBottomLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasBottomLabel">Offcanvas bottom</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body small">
...
</div>
</div>
Pozadí
Posouvání <body>
prvku je zakázáno, když je viditelné mimo plátno a jeho pozadí. Pomocí data-bs-scroll
atributu můžete přepínat <body>
rolování a data-bs-backdrop
přepínat pozadí.
Barevné s rolováním
Zkuste posouvat zbytek stránky, abyste viděli tuto možnost v akci.
Offcanvas s pozadím
.....
Pozadí s posouváním
Zkuste posouvat zbytek stránky, abyste viděli tuto možnost v akci.
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasScrolling" aria-controls="offcanvasScrolling">Enable body scrolling</button>
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasWithBackdrop" aria-controls="offcanvasWithBackdrop">Enable backdrop (default)</button>
<button class="btn btn-primary" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasWithBothOptions" aria-controls="offcanvasWithBothOptions">Enable both scrolling & backdrop</button>
<div class="offcanvas offcanvas-start" data-bs-scroll="true" data-bs-backdrop="false" tabindex="-1" id="offcanvasScrolling" aria-labelledby="offcanvasScrollingLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasScrollingLabel">Colored with scrolling</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>Try scrolling the rest of the page to see this option in action.</p>
</div>
</div>
<div class="offcanvas offcanvas-start" tabindex="-1" id="offcanvasWithBackdrop" aria-labelledby="offcanvasWithBackdropLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasWithBackdropLabel">Offcanvas with backdrop</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>.....</p>
</div>
</div>
<div class="offcanvas offcanvas-start" data-bs-scroll="true" tabindex="-1" id="offcanvasWithBothOptions" aria-labelledby="offcanvasWithBothOptionsLabel">
<div class="offcanvas-header">
<h5 class="offcanvas-title" id="offcanvasWithBothOptionsLabel">Backdrop with scrolling</h5>
<button type="button" class="btn-close text-reset" data-bs-dismiss="offcanvas" aria-label="Close"></button>
</div>
<div class="offcanvas-body">
<p>Try scrolling the rest of the page to see this option in action.</p>
</div>
</div>
Přístupnost
Since the offcanvas panel is conceptually a modal dialog, be sure to add aria-labelledby="..."
—referencing the offcanvas title—to .offcanvas
. Note that you don’t need to add role="dialog"
since we already add it via JavaScript.
Sass
Variables
$offcanvas-padding-y: $modal-inner-padding;
$offcanvas-padding-x: $modal-inner-padding;
$offcanvas-horizontal-width: 400px;
$offcanvas-vertical-height: 30vh;
$offcanvas-transition-duration: .3s;
$offcanvas-border-color: $modal-content-border-color;
$offcanvas-border-width: $modal-content-border-width;
$offcanvas-title-line-height: $modal-title-line-height;
$offcanvas-bg-color: $modal-content-bg;
$offcanvas-color: $modal-content-color;
$offcanvas-box-shadow: $modal-content-box-shadow-xs;
$offcanvas-backdrop-bg: $modal-backdrop-bg;
$offcanvas-backdrop-opacity: $modal-backdrop-opacity;
Usage
The offcanvas plugin utilizes a few classes and attributes to handle the heavy lifting:
.offcanvas
hides the content.offcanvas.show
shows the content.offcanvas-start
hides the offcanvas on the left.offcanvas-end
hides the offcanvas on the right.offcanvas-bottom
hides the offcanvas on the bottom
Add a dismiss button with the data-bs-dismiss="offcanvas"
attribute, which triggers the JavaScript functionality. Be sure to use the <button>
element with it for proper behavior across all devices.
Via data attributes
Toggle
Add data-bs-toggle="offcanvas"
and a data-bs-target
or href
to the element to automatically assign control of one offcanvas element. The data-bs-target
attribute accepts a CSS selector to apply the offcanvas to. Be sure to add the class offcanvas
to the offcanvas element. If you’d like it to default open, add the additional class show
.
Dismiss
Dismissal can be achieved with the data
attribute on a button within the offcanvas as demonstrated below:
<button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label="Close"></button>
or on a button outside the offcanvas using the data-bs-target
as demonstrated below:
<button type="button" class="btn-close" data-bs-dismiss="offcanvas" data-bs-target="#my-offcanvas" aria-label="Close"></button>
Via JavaScript
Enable manually with:
var offcanvasElementList = [].slice.call(document.querySelectorAll('.offcanvas'))
var offcanvasList = offcanvasElementList.map(function (offcanvasEl) {
return new bootstrap.Offcanvas(offcanvasEl)
})
Options
Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-bs-
, as in data-bs-backdrop=""
.
Name | Type | Default | Description |
---|---|---|---|
backdrop |
boolean | true |
Apply a backdrop on body while offcanvas is open |
keyboard |
boolean | true |
Closes the offcanvas when escape key is pressed |
scroll |
boolean | false |
Allow body scrolling while offcanvas is open |
Methods
Asynchronous methods and transitions
All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started but before it ends. In addition, a method call on a transitioning component will be ignored.
Activates your content as an offcanvas element. Accepts an optional options object
.
You can create an offcanvas instance with the constructor, for example:
var myOffcanvas = document.getElementById('myOffcanvas')
var bsOffcanvas = new bootstrap.Offcanvas(myOffcanvas)
Method | Description |
---|---|
toggle |
Toggles an offcanvas element to shown or hidden. Returns to the caller before the offcanvas element has actually been shown or hidden (i.e. before the shown.bs.offcanvas or hidden.bs.offcanvas event occurs). |
show |
Shows an offcanvas element. Returns to the caller before the offcanvas element has actually been shown (i.e. before the shown.bs.offcanvas event occurs). |
hide |
Hides an offcanvas element. Returns to the caller before the offcanvas element has actually been hidden (i.e. before the hidden.bs.offcanvas event occurs). |
getInstance |
Static method which allows you to get the offcanvas instance associated with a DOM element |
getOrCreateInstance |
Static method which allows you to get the offcanvas instance associated with a DOM element, or create a new one in case it wasn’t initialized |
Events
Bootstrap’s offcanvas class exposes a few events for hooking into offcanvas functionality.
Event type | Description |
---|---|
show.bs.offcanvas |
This event fires immediately when the show instance method is called. |
shown.bs.offcanvas |
This event is fired when an offcanvas element has been made visible to the user (will wait for CSS transitions to complete). |
hide.bs.offcanvas |
This event is fired immediately when the hide method has been called. |
hidden.bs.offcanvas |
This event is fired when an offcanvas element has been hidden from the user (will wait for CSS transitions to complete). |
var myOffcanvas = document.getElementById('myOffcanvas')
myOffcanvas.addEventListener('hidden.bs.offcanvas', function () {
// do something...
})