Utilities for Element Framework

This package exposes modules for colors and asynchronous tasks.

Color helper

Re-exports all functionalities from d3-color.

readableColor

Describe color based on Natural Color System

Example:

import { readableColor } from '@refinitiv-ui/utils/color.js';

readableColor('#2a9d8f'); // { name: undefined, tone: 'DARK', main: 'CYAN', mixed: 'GREEN', percent: 12 }
readableColor('#f0f8ff'); // { name: 'aliceblue', tone: 'VERY_LIGHT', main: 'CYAN', mixed: 'BLUE', percent: 47 }

Properties:

| Property | Type | Description | | -------- | ------------------- | ------------------------------ | | name | string | undefined | css color name | | tone | string | color brightness level | | main | string | main color of color admixture | | mixed | string | mixed color of color admixture | | percent | number | mixed color percentage |

Async Tasks

Async tasks include timeout, micro, animation and afterRender.

Example:

import {
  // Runs task in an animation frame
  AfterRenderTaskRunner, // Runs task after render has finished // Runs task inside of a timeout
  AnimationTaskRunner,
  MicroTaskRunner, // Runs task as a MicroTask
  TimeoutTaskRunner
} from '@refinitiv-ui/utils';

const taskRunner = new MicroTaskRunner();

taskRunner.schedule(() => {
  // task to execute
});

taskRunner.schedule() can be called multiple times. Only the last callback will be executed. This is to enable simplified code inside of elements, when multiple actions occur.

Date Time Helper

Helper functions to support date and time manipulations.

Navigation

Helper functions to support keyboard navigation.

Grid Navigation

Helper functions to support navigation over the grid matrix.

For instance, consider the following matrix:

0 0 1 1
1 1 0 1
1 0 1 1
1 1 0 1

where 1 is an active cell, but 0 is an inactive cell.

The matrix can be represented as a grid in an Array format:

const grid = [
  [0, 0, 1, 1],
  [1, 1, 0, 1],
  [1, 0, 1, 1],
  [1, 1, 0, 1]
];

The cell can be represented by zero-based [columnIndex, rowIndex]:

const cell = [0, 3]; // first cell on the fourth row

The utility supports the following navigation methods:

left

Get an active cell when navigating to the left from the start cell.

left(grid, [0, 1]); // Outputs [3, 0]
left(grid, [3, 1]); // Outputs [1, 1]
left(grid, [2, 0]); // Outputs null

right

Get an active cell when navigating to the right from the start cell.

right(grid, [0, 1]); // Outputs [1, 1]
right(grid, [3, 1]); // Outputs [0, 2]
right(grid, [3, 3]); // Outputs null

up

Navigate up from the start cell trying to find the closest cell on the preceding rows.

up(grid, [0, 1]); // Outputs [2, 0]
up(grid, [3, 1]); // Outputs [3, 0]
up(grid, [3, 0]); // Outputs null

down

Navigate down from the start cell trying to find the closest cell on the following rows.

down(grid, [0, 1]); // Outputs [0, 2]
down(grid, [1, 1]); // Outputs [0, 2]
down(grid, [1, 3]); // Outputs null

first

Get the first active cell.

first(grid); // Outputs [2, 0]

last

Get the last active cell.

last(grid); // Outputs [3, 3]

Accessibility

Helper functions for accessibility support.

label

Get element label based on aria-label, aria-labelledby or label[for="<element.id>"].

description

Get element description based on aria-description or aria-describedby.

required

Get element required state based on aria-required.

Element Helpers

Helper functions to query ShadowDom.

getElementScope

Get element scope, which can be either DocumentElement, DocumentFragment or null if element is not attached to DOM.