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// @flow
import * as React from "react";
import FormSelect from "./FormSelect.react";
import FormInputGroup from "./FormInputGroup.react";
type Props = {|
+children?: React.Node,
+className?: string,
+defaultDate: Date,
+minYear: number,
+maxYear: number,
+format: string,
+monthLabels: Array<string>,
+onChange?: Date => void,
|};
type State = {|
currentDate: Date,
|};
type DateComponents = {
yyyy: React.Node,
dd: React.Node,
mm: React.Node,
};
type ChangeTypes = "mm" | "yyyy" | "dd";
class FormDatePicker extends React.PureComponent<Props, State> {
static defaultProps = {
monthLabels: [
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December",
],
minYear: 1897,
maxYear: new Date().getFullYear(),
format: "mm/dd/yyyy",
defaultDate: new Date(),
};
state = {
currentDate: this.props.defaultDate,
};
// Handle date changes
_handleOnChange = (type: ChangeTypes, value: number): void => {
const { currentDate } = this.state;
const { onChange } = this.props;
const newDate: Date = new Date(currentDate);
// Change month
if (type === "mm") {
newDate.setMonth(value);
}
// Change day
if (type === "dd") {
newDate.setDate(value);
}
if (type === "yyyy") {
newDate.setFullYear(value);
}
this.setState({ currentDate: newDate }, () => {
onChange && onChange(this.state.currentDate);
});
};
// Creates an array with numeric values from start to end
_range = (start: number, end: number): Array<number> =>
Array.from({ length: end + 1 - start }, (v, k) => k + start);
// Renders the months select
_renderMonths = (): React.Node => {
const { currentDate } = this.state;
const { monthLabels } = this.props;
const onChangeMonths = (e: SyntheticInputEvent<EventTarget>): void =>
this._handleOnChange("mm", Number(e.target.value));
return (
<FormSelect onChange={onChangeMonths}>
{monthLabels.map((name, index) => (
<option value={index} selected={currentDate.getUTCMonth() === index}>
{name}
</option>
))}
</FormSelect>
);
};
// Renders the days select
_renderDays = (): React.Node => {
const { currentDate } = this.state;
const currentMonthDays = new Date(
currentDate.getUTCFullYear(),
currentDate.getUTCMonth() + 1,
0
).getDate();
const daysRange = this._range(1, currentMonthDays);
const currentDay = currentDate.getUTCDate();
const onChangeDays = (e: SyntheticInputEvent<EventTarget>) =>
this._handleOnChange("dd", Number(e.target.value));
return (
<FormSelect onChange={onChangeDays}>
{daysRange.map(day => (
<option value={day} selected={currentDay === day}>
{day}
</option>
))}
</FormSelect>
);
};
// renderes the years select
_renderYears = (): React.Node => {
const { minYear, maxYear } = this.props;
const { currentDate } = this.state;
const yearsRange = this._range(minYear, maxYear).reverse();
const currentYear = currentDate.getUTCFullYear();
const onChangeYears = (e: SyntheticInputEvent<EventTarget>) =>
this._handleOnChange("yyyy", Number(e.target.value));
return (
<FormSelect onChange={onChangeYears}>
{yearsRange.map(year => (
<option value={year} selected={currentYear === year}>
{year}
</option>
))}
</FormSelect>
);
};
render(): React.Node {
const { format, className } = this.props;
const formatSplit = format.split("/");
const dateComponents: DateComponents = {
mm: this._renderMonths(),
dd: this._renderDays(),
yyyy: this._renderYears(),
};
return (
<div className={className}>
<FormInputGroup>
{formatSplit.map((type: string): React.Node => dateComponents[type])}
</FormInputGroup>
</div>
);
}
}
FormDatePicker.displayName = "Form.DatePicker";
export default FormDatePicker;
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