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react-checkbox-group.tsx
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react-checkbox-group.tsx
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import * as React from 'react'
import * as PropTypes from 'prop-types'
const includes = (array: any[], value: any) => {
return array.some((item) => item === value)
}
const uniq = (array: any[]) => {
return array.filter((item, index, self) => self.indexOf(item) === index)
}
export type CheckboxGroupSelectedValues = (string | number)[]
export interface CheckboxGroupContext {
checkboxGroup: {
name: string
selectedValues: CheckboxGroupSelectedValues
onChange: (
selectedValues: CheckboxGroupSelectedValues,
ev: React.ChangeEvent<HTMLInputElement>,
) => void
}
}
export interface CheckboxProps {
value: string | number
}
export class Checkbox extends React.Component<
CheckboxProps & React.InputHTMLAttributes<HTMLInputElement>
> {
static propTypes = {
value: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
}
static contextTypes = {
checkboxGroup: PropTypes.object,
}
private _onChange = (ev: React.ChangeEvent<HTMLInputElement>) => {
const { checkboxGroup }: CheckboxGroupContext = this.context
const nextSelectedValues = uniq(
ev.target.checked
? [...checkboxGroup.selectedValues, this.props.value]
: checkboxGroup.selectedValues.filter(
(value) => value !== this.props.value,
),
)
checkboxGroup.onChange(nextSelectedValues, ev)
}
render() {
const { checkboxGroup }: CheckboxGroupContext = this.context
const checked = includes(checkboxGroup.selectedValues, this.props.value)
return (
<input
{...this.props}
type="checkbox"
name={checkboxGroup.name}
checked={checked}
onChange={this._onChange}
/>
)
}
}
export interface CheckboxGroupProps {
name: string
selectedValues: CheckboxGroupSelectedValues
onChange: (
selectedValues: CheckboxGroupSelectedValues,
ev: React.ChangeEvent<HTMLInputElement>,
) => void
children: React.ReactNode
}
export class CheckboxGroup extends React.PureComponent<CheckboxGroupProps> {
static propTypes = {
name: PropTypes.string.isRequired,
selectedValues: PropTypes.arrayOf(
PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
).isRequired,
onChange: PropTypes.func.isRequired,
}
static childContextTypes = {
checkboxGroup: PropTypes.object,
}
getChildContext(): CheckboxGroupContext {
const { name, selectedValues, onChange } = this.props
return {
checkboxGroup: {
name,
selectedValues,
onChange,
},
}
}
render() {
return this.props.children
}
}