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Fit a popover element on the screen.




npm downloads CI


A component that aligns its child relatively to its parent while being aware where it may and may not fit.


  • Install by executing npm install react-fit or yarn add react-fit.
  • Import by adding import Fit from 'react-fit'.
  • Do stuff with it!
    function ElementWithChild() {
      return (
            <PopoverChild />

Getting started


Your project needs to use React 16.8 or later.


Add React-Fit to your project by executing npm install react-fit or yarn add react-fit.

How does it work?

  1. By default, the element provided to <Fit /> as a child is displayed below its parent, aligned to the left.
  2. If the element can't fit in this position and collides with bottom and/or right border of the container, <Fit /> checks if there's more space for the element on the other side(s) of the axis/axes the collision(s) has been detected on. If so, the element is moved above its parent and/or aligned to the right, depending on the collision axis.
  3. If the element still can't fit where it's placed, <Fit /> decreases the element's size. If min-width/min-height are provided, they will be respected.

Positioning the element

Vertical axis (default)

By default, the element is displayed below its parent, aligned to the left of its parent.

│   Parent   │
│                         │
│         Child           │
│                         │
  • To display the element above: provide invertAxis flag.
  • To align the element to the right: provide invertSecondaryAxis flag.

Horizontal axis (mainAxis="x")

By providing mainAxis="x" to <Fit />, the element is displayed on the right of its parent, aligned to the top of its parent.

│   Parent   │                         │
└────────────┤         Child           │
             │                         │
  • To display the element on the left: provide invertAxis flag.
  • To align the element to the bottom: provide invertSecondaryAxis flag.


By default, React-Fit leaves 8px of space between its child and the borders of the container.

│ ┌────────────┐                           │
│ │   Parent   │                           │
│ ├────────────┴────────────┐              │
│ │                         │              │
│ │         Child           │              │
│ │                         │              │
│ └─────────────────────────┘              │

If you wish to change this spacing, you can provide spacing to <Fit />. For example, if you wish for the child to touch the borders of the container, decrease the spacing by providing spacing={0} to <Fit />.

│ ┌────────────┐                           │
│ │   Parent   │                           │
│ ├────────────┴────────────┐              │
│ │                         │              │
│ │         Child           │              │
│ │      (now higher)       │              │
│ │                         │              │

You can also provide different spacing for each side by providing an object, for example spacing={{ top: 10, bottom: 20, left: 30, right: 40 }}, to <Fit />. Note: Memoize the object or define it outside render function to avoid unnecessary re-renders.


To avoid unnecessary style recalculations that may be caused by React-Fit applying the styles needed to make it work properly, the element should have absolute position, and its parent element should have relative or absolute position.


The MIT License.