Tooltips

Bootstrap 5 Tooltip component

Bootstrap Tooltip displays informative text when users hover, focus, or tap an element. They display text tips next to the element in question.

Documentation and examples for adding custom tooltips with CSS and JavaScript using CSS3 for animations and data-mdb-attributes for local title storage.

Note: Read the API tab to find all available options and advanced customization

Basic example

Hover over the links below to see tooltips.

Hover the link to see the tooltip

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            <p>
              Hover the link to see the
              <a href="#" data-mdb-toggle="tooltip" title="Hi! I'm tooltip">tooltip</a>
            </p>

Overview

Things to know when using the tooltip plugin:

  • Tooltips are opt-in for performance reasons, so you must initialize them yourself.
  • Tooltips with zero-length titles are never displayed.
  • Specify container: 'body' to avoid rendering problems in more complex components (like our input groups, button groups, etc).
  • Triggering tooltips on hidden elements will not work.
  • Tooltips for .disabled or disabled elements must be triggered on a wrapper element.
  • When triggered from hyperlinks that span multiple lines, tooltips will be centered. Use white-space: nowrap; on your <a>s to avoid this behavior.
  • Tooltips must be hidden before their corresponding elements have been removed from the DOM.
  • Tooltips can be triggered thanks to an element inside a shadow DOM.

Four directions

Hover over the buttons below to see the four tooltips directions: top, right, bottom, and left.

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            <button type="button" class="btn btn-secondary" data-mdb-toggle="tooltip" data-mdb-placement="top" title="Tooltip on top">
              Tooltip on top
            </button>
            <button type="button" class="btn btn-secondary" data-mdb-toggle="tooltip" data-mdb-placement="right" title="Tooltip on right">
              Tooltip on right
            </button>
            <button type="button" class="btn btn-secondary" data-mdb-toggle="tooltip" data-mdb-placement="bottom" title="Tooltip on bottom">
              Tooltip on bottom
            </button>
            <button type="button" class="btn btn-secondary" data-mdb-toggle="tooltip" data-mdb-placement="left" title="Tooltip on left">
              Tooltip on left
            </button>

And with custom HTML added:

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            <button
              type="button"
              class="btn btn-secondary"
              data-mdb-toggle="tooltip"
              data-mdb-html="true"
              title="<em>Tooltip</em> <u>with</u> <b>HTML</b>"
            >
              Tooltip with HTML
            </button>

Disabled elements

Elements with the disabled attribute aren’t interactive, meaning users cannot focus, hover, or click them to trigger a tooltip (or popover). As a workaround, you’ll want to trigger the tooltip from a wrapper <div> or <span>, ideally made keyboard-focusable using tabindex="0", and override the pointer-events on the disabled element.

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            <span class="d-inline-block" tabindex="0" data-mdb-toggle="tooltip" title="Disabled tooltip">
              <button class="btn btn-primary" style="pointer-events: none;" type="button" disabled>Disabled button</button>
            </span>

Tooltips - API

Usage

The tooltip plugin generates content and markup on demand, and by default places tooltips after their trigger element.

Via JavaScript:

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            const exampleEl = document.getElementById('example')
            const tooltip = new mdb.Tooltip(exampleEl)

Overflow auto and scroll

Tooltip position attempts to automatically change when a parent container has overflow: auto or overflow: scroll like our .table-responsive, but still keeps the original placement’s positioning. To resolve, set the boundary option to anything other than default value, 'scrollParent', such as 'window':

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            const exampleEl = document.getElementById('example');
            const tooltip = new bootstrap.Tooltip(exampleEl, {
              boundary: 'window'
            });

Markup

The required markup for a tooltip is only a data attribute and title on the HTML element you wish to have a tooltip. The generated markup of a tooltip is rather simple, though it does require a position (by default, set to top by the plugin).

Making tooltips work for keyboard and assistive technology users

You should only add tooltips to HTML elements that are traditionally keyboard-focusable and interactive (such as links or form controls). Although arbitrary HTML elements (such as <span>s) can be made focusable by adding the tabindex="0" attribute, this will add potentially annoying and confusing tab stops on non-interactive elements for keyboard users, and most assistive technologies currently do not announce the tooltip in this situation. Additionally, do not rely solely on hover as the trigger for your tooltip, as this will make your tooltips impossible to trigger for keyboard users.

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            <!-- HTML to write -->
            <a href="#" data-mdb-toggle="tooltip" title="Some tooltip text!">Hover over me</a>

            <!-- Generated markup by the plugin -->
            <div class="tooltip bs-tooltip-top" role="tooltip">
              <div class="tooltip-arrow"></div>
              <div class="tooltip-inner">Some tooltip text!</div>
            </div>

Options

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-mdb-, as in data-mdb-animation="".

Note: For security reasons the sanitize, sanitizeFn and whiteList options cannot be supplied using data attributes.

Name Type Default Description
animation boolean true Apply a CSS fade transition to the tooltip
container string | element | false false

Appends the tooltip to a specific element. Example: container: 'body'. This option is particularly useful in that it allows you to position the tooltip in the flow of the document near the triggering element - which will prevent the tooltip from floating away from the triggering element during a window resize.

customClass string | function ''

Add classes to the tooltip when it is shown. Note that these classes will be added in addition to any classes specified in the template. To add multiple classes, separate them with spaces: 'class-1 class-2'.

You can also pass a function that should return a single string containing additional class names.

delay number | object 0

Delay showing and hiding the tooltip (ms) - does not apply to manual trigger type

If a number is supplied, delay is applied to both hide/show

Object structure is: delay: { "show": 500, "hide": 100 }
html boolean false

Allow HTML in the tooltip.

If true, HTML tags in the tooltip's title will be rendered in the tooltip. If false, innerText property will be used to insert content into the DOM.

Use text if you're worried about XSS attacks.
placement string | function 'top'

How to position the tooltip - auto | top | bottom | left | right.
When auto is specified, it will dynamically reorient the tooltip.

When a function is used to determine the placement, it is called with the tooltip DOM node as its first argument and the triggering element DOM node as its second. The this context is set to the tooltip instance.

selector string | false false If a selector is provided, tooltip objects will be delegated to the specified targets. In practice, this is used to also apply tooltips to dynamically added DOM elements (jQuery.on support). See this and an informative example.
template string '<div class="tooltip" role="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>'

Base HTML to use when creating the tooltip.

The tooltip's title will be injected into the .tooltip-inner.

.tooltip-arrow will become the tooltip's arrow.

The outermost wrapper element should have the .tooltip class and role="tooltip"

title string | element | function ''

Default title value if title attribute isn't present.

If a function is given, it will be called with its this reference set to the element that the tooltip is attached to.

trigger string 'hover focus'

How tooltip is triggered - click | hover | focus | manual. You may pass multiple triggers; separate them with a space.

'manual' indicates that the tooltip will be triggered programmatically via the .tooltip('show'), .tooltip('hide') and .tooltip('toggle') methods; this value cannot be combined with any other trigger.

'hover' on its own will result in tooltips that cannot be triggered via the keyboard, and should only be used if alternative methods for conveying the same information for keyboard users is present.

offset number | string | function 0

Offset of the tooltip relative to its target.

When a function is used to determine the offset, it is called with an object containing the offset data as its first argument. The function must return an object with the same structure. The triggering element DOM node is passed as the second argument.

For more information refer to Popper's offset docs.

fallbackPlacement string | array 'flip' Allow to specify which position Popper will use on fallback. For more information refer to Popper's behavior docs
boundary string | element 'clippingParents' Overflow constraint boundary of the tooltip (applied only for the preventOverflow modifier of the Popper). Accepts the values of 'viewport', 'window', 'scrollParent', or an HTMLElement reference (via JavaScript only). For more information refer to Popper's detectOverflow docs.
sanitize boolean true Enable or disable the sanitization. If activated 'template' and 'title' options will be sanitized.
whiteList object Default value Object which contains allowed attributes and tags
sanitizeFn null | function null Here you can supply your own sanitize function. This can be useful if you prefer to use a dedicated library to perform sanitization.
popperConfig null | object null To change Bootstrap's default Popper config, see Popper's configuration

Data attributes for individual tooltips:
Options for individual tooltips can alternatively be specified through the use of data attributes, as explained above.

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.

show Reveals an element’s tooltip. Returns to the caller before the tooltip has actually been shown (i.e. before the shown.mdb.tooltip event occurs). This is considered a “manual” triggering of the tooltip. tooltips whose title and content are both zero-length are never displayed.
hide Hides an element’s tooltip. Returns to the caller before the tooltip has actually been hidden (i.e. before the hidden.mdb.tooltip event occurs). This is considered a “manual” triggering of the tooltip.
toggle Toggles an element’s tooltip. Returns to the caller before the tooltip has actually been shown or hidden (i.e. before the shown.mdb.tooltip or hidden.mdb.tooltip event occurs). This is considered a “manual” triggering of the tooltip.
dispose Hides and destroys an element’s tooltip. tooltips that use delegation (which are created using the selector option) cannot be individually destroyed on descendant trigger elements.
getInstance Static method which allows you to get the tooltip instance associated to a DOM element.
enable Gives an element’s tooltip the ability to be shown. tooltips are enabled by default.
disable Removes the ability for an element’s tooltip to be shown. The tooltip will only be able to be shown if it is re-enabled.
toggleEnabled Toggles the ability for an element’s tooltip to be shown or hidden.
update Updates the position of an element’s tooltip.
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          const tooltipEl = document.getElementById('tooltip');
          const tooltip = new mdb.Tooltip(tooltipEl);
          tooltip.show();

Events

Event type Description
show.mdb.tooltip This event fires immediately when the show instance method is called.
shown.mdb.tooltip This event is fired when the tooltip has been made visible to the user (will wait for CSS transitions to complete).
hide.mdb.tooltip This event is fired immediately when the hide instance method has been called.
hidden.mdb.tooltip This event is fired when the tooltip has finished being hidden from the user (will wait for CSS transitions to complete).
inserted.mdb.tooltip This event is fired after the show.mdb.tooltip event when the tooltip template has been added to the DOM.
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            const tooltipEl = document.getElementById('tooltip');
            const tooltip = new mdb.Tooltip(tooltipEl);

            tooltipEl.addEventListener('hidden.mdb.tooltip', () => {
              // do something...
            });

            tooltip.hide();

Import

MDB UI KIT also works with module bundlers. Use the following code to import this component:

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            import { Tooltip } from 'mdb-ui-kit';