web/src/flatpickr.ts - main - githubmirror/zulip

web/src/flatpickr.ts
198 строк7 KB
Anders Kaseorg
eslint: Fix unicorn/prefer-else-if.
29 июл 2026, 02:35
29 июл 2026, 02:351418047
import {formatISO} from "date-fns";
import flatpickr from "flatpickr";
import confirmDatePlugin from "flatpickr/dist/plugins/confirmDate/confirmDate";
import {$} from "jquery";
import assert from "minimalistic-assert";

import {$t} from "./i18n.ts";
import {user_settings} from "./user_settings.ts";
import * as util from "./util.ts";

export let flatpickr_instance: flatpickr.Instance | undefined;

export function is_open(): boolean {
    return Boolean(flatpickr_instance?.isOpen);
}

function is_numeric_key(key: string): boolean {
    return ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"].includes(key);
}

const ENABLE_TIME_DEFAULT = true;

export function show_flatpickr(
    element: HTMLElement,
    callback: (time: string) => void,
    default_timestamp: flatpickr.Options.DateOption,
    options: flatpickr.Options.Options = {},
    hide_confirm_button = false,
): flatpickr.Instance {
    const $flatpickr_input = $<HTMLInputElement>("<input>").attr("id", "#timestamp_flatpickr");

    options.enableTime ??= ENABLE_TIME_DEFAULT;
    if (hide_confirm_button && options.enableTime) {
        throw new Error(
            "`hide_confirm_button` is only supported for date-only flatpickr (set `enableTime` to false).",
        );
    }

    const plugins: flatpickr.Options.Plugin[] = [...(options.plugins ?? [])];
    if (!hide_confirm_button) {
        plugins.unshift(
            confirmDatePlugin({
                showAlways: true,
                confirmText: $t({defaultMessage: "Confirm"}),
                confirmIcon: "",
            }),
        );
    }

    function submit(): void {
        const time = $flatpickr_input.val();
        assert(typeof time === "string");
        callback(time);
    }

    // Called when hide_confirm_button is true and we want to directly
    // submit on date select.
    const on_change_hook: flatpickr.Options.Hook = (selectedDates) => {
        if (selectedDates.length === 0) {
            return;
        }

        submit();
        flatpickr_instance?.close();
        // Defer destroy until after flatpickr's keydown handler finishes closing.
        setTimeout(() => {
            flatpickr_instance?.destroy();
        }, 0);
    };

    if (hide_confirm_button) {
        if (options.onChange === undefined) {
            options.onChange = on_change_hook;
        } else if (Array.isArray(options.onChange)) {
            options.onChange = [...options.onChange, on_change_hook];
        } else {
            options.onChange = [options.onChange, on_change_hook];
        }
    }

    flatpickr_instance = flatpickr(util.the($flatpickr_input), {
        mode: "single",
        clickOpens: false,
        defaultDate: default_timestamp,
        positionElement: element,
        dateFormat: "Z",
        formatDate: (date) => formatISO(date),
        disableMobile: true,
        time_24hr: user_settings.twenty_four_hour_time,
        minuteIncrement: 1,
        onKeyDown(_selectedDates, _dateStr, instance, event: KeyboardEvent) {
            // See also the keydown handler below.
            //
            // TODO: Add a clear explanation of exactly how key
            // interactions are dispatched; it seems that keyboard
            // logic from this function, the built-in flatpickr
            // onKeyDown function, and the below keydown handler are
            // used, but it's not at all clear in what order they are
            // called, or what the overall control flow is.
            if (event.key === "Tab") {
                // Ensure that tab/shift_tab navigation work to
                // navigate between the elements in flatpickr itself
                // and the confirmation button at the bottom of the
                // popover.
                const enabled_time_options = [
                    instance.hourElement,
                    instance.minuteElement,
                    ...(user_settings.twenty_four_hour_time ? [] : [instance.amPM]),
                ];
                const elems = [
                    instance.selectedDateElem,
                    ...(options.enableTime ? enabled_time_options : []),
                    ...(hide_confirm_button ? [] : [$(".flatpickr-confirm")[0]]),
                ];
                assert(event.target instanceof HTMLElement);
                const i = elems.indexOf(event.target);
                const n = elems.length;
                const remain = (i + (event.shiftKey ? -1 : 1)) % n;
                const target = elems[Math.floor(remain >= 0 ? remain : remain + n)];
                event.preventDefault();
                event.stopPropagation();
                assert(target !== undefined);
                target.focus();
            } else {
                // Prevent keypresses from propagating to our general hotkey.ts
                // logic. Without this, `Up` will navigate both in the
                // flatpickr instance and in the message feed behind
                // it.
                event.stopPropagation();
            }
        },
        ...options,
        plugins,
    });

    const $container = $(flatpickr_instance.calendarContainer);

    $container.on("keydown", (e) => {
        // Main keyboard UI implementation.

        if (is_numeric_key(e.key)) {
            // Let users type numeric values
            return true;
        }

        switch (e.key) {
            case "Backspace":
            case "Delete":
                // Let backspace or delete be handled normally
                return true;
            case "Enter":
                if (e.target.classList[0] === "flatpickr-day") {
                    // use flatpickr's built-in behavior to choose the selected day.
                    return true;
                }
                if (!hide_confirm_button) {
                    $container.find(".flatpickr-confirm").trigger("click");
                }
                break;
            case "Escape":
                flatpickr_instance?.close();
                flatpickr_instance?.destroy();
                break;
            case "Tab":
                // Use flatpickr's built-in navigation between elements.
                return true;
            case "ArrowLeft":
            case "ArrowUp":
            case "ArrowRight":
            case "ArrowDown":
                // use flatpickr's built-in navigation of the date grid.
                e.stopPropagation();
                return true;
        }

        e.stopPropagation();
        e.preventDefault();

        return true;
    });

    if (!hide_confirm_button) {
        $container.on("click", ".flatpickr-confirm", () => {
            submit();
            flatpickr_instance?.close();
            flatpickr_instance?.destroy();
        });
    }
    flatpickr_instance.open();
    assert(flatpickr_instance.selectedDateElem !== undefined);
    flatpickr_instance.selectedDateElem.focus();

    return flatpickr_instance;
}

export function close_all(): void {
    $(".flatpickr-calendar").removeClass("open");
}