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.