Some of the components we have are designed to be opened inside of the popup:
Datepicker
Dropdown
Popover
Tooltip
Typeahead
When the popup is opened, it is positioned correctly next to the target
element and fits in the
viewport. It is also possible to provide some options, ex. whether the popup should be opened to the
top
or to the bottom
of the target
element.
For instance here the tooltip is always forced to be opened to the right
, even if it won't fit in the
viewport.
Bootstrap uses popper.js
library for positioning. We decided not to have any dependencies on 3rd
party libraries, so we implement a subset of the same functionality ourselves. If something is missing or you
have a very specific use case - please open an issue on GitHub and we'll discuss.
4.1
we position the popup using position: absolute; transform: translate(x,y);
to match Bootstrap.
Components in question have two common inputs that help with positioning: placement
and
container
Placement
Placement specifies where the popup should be positioned in the order of preference.
If no placement
value is provided at all, each component has it's own default order of preference.
Check the component API docs to find out the default order, ex.
here is the tooltip's API.
There also a special "auto"
property, that is equal to "top", "top-left", "top-right", "bottom",
"bottom-left", "bottom-right", "left", "left-top", "left-bottom", "right", "right-top", "right-bottom"
Container
Container specifies where the popup will be physically attached to the DOM.
By default it is attached as a sibling of the target
element and the only optional supported container
is 'body'
.
There are two things that make dropdown a bit special at the moment: it won't be positioned dynamically when inside the navbar and the popup (dropdown menu) is always attached to the DOM.
When dropdown is used inside the Bootstrap's navbar
, it will not be positioned (to match
Bootstrap behaviour and work fine on mobile). You can override it by using the display
input.
As Dropdown
is not a component, but a set of directives, the dropdown menu popup is always attached
to the DOM even when not visible. Depending on the container
input, the menu will always be
attached either to the body or to the dropdown element.