--- layout: docs title: Toasts description: Push notifications to your visitors with a toast, a lightweight and easily customizable alert message. group: components toc: true --- Toasts are lightweight notifications designed to mimic the push notifications that have been popularized by mobile and desktop operating systems. They're built with flexbox, so they're easy to align and position. ## Overview Things to know when using the toast plugin: - If you're building our JavaScript from source, it [requires `util.js`]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/javascript/#util). - Toast are opt-in for performance reasons, so **you must initialize them yourself**. - Toast will auto hide if you do not specify `autohide: false` Got all that? Great, let's see how they work with some examples. ## Examples A basic toast can include a header (though it doesn't strictly need one) with whatever contents you like. The header is also `display: flex`, so `.mr-auto` and `.ml-auto` can be used for easy pushing of content, as well as all our flexbox utilities.
{% capture example %} {% endcapture %} {% include example.html content=example %}
They're slightly translucent, too, so they blend over whatever they might appear over. For browsers that support `backdrop-filter`, we'll also attempt to blur the elements under a toast.
{% capture example %} {% endcapture %} {% include example.html content=example %}
Plus, they'll easily stack.
{% capture example %} {% endcapture %} {% include example.html content=example %}
## Accessibility Toasts are intended to be small interruptions to your visitors or users, so to help those on screen readers, you should wrap your toasts in an [`aria-live` region](https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Live_Regions). This allows screen readers the ability to see suggested interruptions without any visual cues. If the information needed is important for the process, e.g. for a list of errors in a form, then use the [alert component]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/alerts/) instead of toast. You also need to adapt the `role` and `aria-live` level depending on the content. If it's an important message like an error, use `role="alert" aria-live="assertive"`, otherwise use `role="status" aria-live="polite"` attributes. As the content you're displaying changes, be sure to update the [`delay` timeout](#options) to ensure people have enough time to read the toast. {% highlight html %} {% endhighlight %} When using `autohide: false`, you must add a close button to allow users to dismiss the toast.
{% capture example %} {% endcapture %} {% include example.html content=example %}
## Placement Place toasts with custom CSS as you need them. The top right is often used for notifications, as is the top middle. If you're only ever going to show one toast at a time, put the positioning styles right on the `.toast.`
{% capture example %}
Bootstrap 11 mins ago
Hello, world! This is a toast message.
{% endcapture %} {% include example.html content=example %}
For systems that generate more notifications, consider using a wrapping element so they can easily stack.
{% capture example %}
{% endcapture %} {% include example.html content=example %}
You can also get fancy with flexbox utilities.
{% capture example html %}
{% endcapture %} {% include example.html content=example %}
## JavaScript behavior ### Usage Initialize toasts via JavaScript: {% highlight js %} $('.toast').toast(option) {% endhighlight %} ### Options Options can be passed via data attributes or JavaScript. For data attributes, append the option name to `data-`, as in `data-animation=""`.
Name Type Default Description
animation boolean true Apply a CSS fade transition to the toast
autohide boolean true Auto hide the toast
delay number 500 Delay hiding the toast (ms)
### Methods {% include callout-danger-async-methods.md %} #### `$().toast(options)` Attaches a toast handler to an element collection. #### `.toast('show')` Reveals an element's toast. **Returns to the caller before the toast has actually been shown** (i.e. before the `shown.bs.toast` event occurs). You have to manually call this method, instead your toast won't show. {% highlight js %}$('#element').toast('show'){% endhighlight %} #### `.toast('hide')` Hides an element's toast. **Returns to the caller before the toast has actually been hidden** (i.e. before the `hidden.bs.toast` event occurs). You have to manually call this method if you made `autohide` to `false`. {% highlight js %}$('#element').toast('hide'){% endhighlight %} #### `.toast('dispose')` Hides an element's toast. Your toast will remain on the DOM but won't show anymore. {% highlight js %}$('#element').toast('dispose'){% endhighlight %} ### Events
Event Type Description
show.bs.toast This event fires immediately when the show instance method is called.
shown.bs.toast This event is fired when the toast has been made visible to the user.
hide.bs.toast This event is fired immediately when the hide instance method has been called.
hidden.bs.toast This event is fired when the toast has finished being hidden from the user.
{% highlight js %} $('#myToast').on('hidden.bs.toast', function () { // do something… }) {% endhighlight %}