Installation

Install using your package manager of choice:

npm install @viselect/react

If you're (still) using CRA, you may run into issues while using the bundle provided. See this comment for how to fix it.

Last but not least you'll need to add some basic styles to make your selection-area visible:

.selection-area {
    background: rgba(46, 115, 252, 0.11);
    border: 2px solid rgba(98, 155, 255, 0.81);
    border-radius: 0.1em;
}

Additionally, to not interfere with text-selection, selection-js won't prevent any default events anymore (as of v2.0.3). This however can cause problems with the actual selection ("introduced" by #99, reported in #103). If you don't care about text-selection, add the following to the container where all your selectables are located:

.container {
    user-select: none;
}

Usage

All options are exposed as props. They're a one-to-one mapping of the original options found in the vanilla version!

import SelectionArea, {SelectionEvent} from '@viselect/react';
import React, {FunctionComponent, useState} from 'react';

const App: FunctionComponent = () => {
    const [selected, setSelected] = useState<Set<number>>(() => new Set());

    const extractIds = (els: Element[]): number[] =>
        els.map(v => v.getAttribute('data-key'))
            .filter(Boolean)
            .map(Number);

    const onStart = ({event, selection}: SelectionEvent) => {
        if (!event?.ctrlKey && !event?.metaKey) {
            selection.clearSelection();
            setSelected(() => new Set());
        }
    };

    const onMove = ({store: {changed: {added, removed}}}: SelectionEvent) => {
        setSelected(prev => {
            const next = new Set(prev);
            extractIds(added).forEach(id => next.add(id));
            extractIds(removed).forEach(id => next.delete(id));
            return next;
        });
    };

    return (
        <>
            <SelectionArea className="container"
                           onStart={onStart}
                           onMove={onMove}
                           selectables=".selectable">
                {new Array(42).fill(0).map((_, index) => (
                    <div className={selected.has(index) ? 'selected selectable' : 'selectable'}
                         data-key={index}
                         key={index}/>
                ))}
            </SelectionArea>
        </>
    );
}