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@floating-ui/utils

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@floating-ui/utils

Utilities for Floating UI

  • 0.2.8
  • latest
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  • npm
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What is @floating-ui/utils?

The @floating-ui/utils package provides utility functions for positioning floating elements (like tooltips, popovers, dropdowns, etc.) in relation to reference elements in the DOM. It is part of the Floating UI library, which offers a low-level toolkit for creating floating elements.

What are @floating-ui/utils's main functionalities?

computePosition

This feature calculates the position of a floating element relative to a reference element and applies the calculated position to the floating element.

import {computePosition} from '@floating-ui/dom';

const referenceElement = document.querySelector('#reference');
const floatingElement = document.querySelector('#floating');

computePosition(referenceElement, floatingElement).then(data => {
  Object.assign(floatingElement.style, {
    left: `${data.x}px`,
    top: `${data.y}px`,
  });
});

arrow

The arrow utility positions an arrow element within a floating element so that it is properly aligned with the reference element.

import {computePosition, arrow} from '@floating-ui/dom';

const referenceElement = document.querySelector('#reference');
const floatingElement = document.querySelector('#floating');
const arrowElement = floatingElement.querySelector('#arrow');

computePosition(referenceElement, floatingElement, {
  middleware: [arrow({element: arrowElement})],
}).then(data => {
  Object.assign(floatingElement.style, {
    left: `${data.x}px`,
    top: `${data.y}px`,
  });
  Object.assign(arrowElement.style, data.middlewareData.arrow);
});

autoPlacement

The autoPlacement utility automatically chooses the best placement for a floating element based on available space in the viewport.

import {computePosition, autoPlacement} from '@floating-ui/dom';

const referenceElement = document.querySelector('#reference');
const floatingElement = document.querySelector('#floating');

computePosition(referenceElement, floatingElement, {
  middleware: [autoPlacement()],
}).then(data => {
  Object.assign(floatingElement.style, {
    left: `${data.x}px`,
    top: `${data.y}px`,
  });
});

flip

The flip utility adjusts the placement of the floating element to prevent it from overflowing the viewport.

import {computePosition, flip} from '@floating-ui/dom';

const referenceElement = document.querySelector('#reference');
const floatingElement = document.querySelector('#floating');

computePosition(referenceElement, floatingElement, {
  middleware: [flip()],
}).then(data => {
  Object.assign(floatingElement.style, {
    left: `${data.x}px`,
    top: `${data.y}px`,
  });
});

offset

The offset utility adds space between the reference element and the floating element, defined by the offset value.

import {computePosition, offset} from '@floating-ui/dom';

const referenceElement = document.querySelector('#reference');
const floatingElement = document.querySelector('#floating');

computePosition(referenceElement, floatingElement, {
  middleware: [offset(10)],
}).then(data => {
  Object.assign(floatingElement.style, {
    left: `${data.x}px`,
    top: `${data.y}px`,
  });
});

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Package last updated on 15 Sep 2024

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