Tasks

The task system keeps track of pending tasks in a specific context. This is meant primarily for preventing user interaction while some operation is running.

JSXNo Build

import { Inject } from "rvx";
import { TASKS, Tasks, isPending, waitFor } from "rvx/async";

<Inject key={TASKS} value={new Tasks()}>
    {() => <>
        <button
            // Disable this button when there are any pending tasks:
            disabled={isPending}
            on:click={() => {
                // Block user interactions while some operation is running:
                waitFor(new Promise(resolve => {
                    setTimeout(resolve, 1000);
                }));
            }}
        >Click me!</button>
    </>}
</Inject>

import { inject, TASKS, Tasks, isPending, waitFor } from "./rvx.js";

inject(TASKS, new Tasks(), () => [
    e("button")
        // Disable this button when there are any pending tasks:
        .set("disabled", isPending)
        .on("click", () => {
            // Block user interactions while some operation is running:
            waitFor(new Promise(resolve => {
                setTimeout(resolve, 1000);
            }));
        })
        .append("Click me!"),
])

Parent Tasks

Tasks instances can have a parent which is meant for separating contexts like the content of dialogs and popovers:

JSXNo Build

function SomePopoverComponent(props: { children: () => unknown; }) {
    return <Inject key={TASKS} value={Tasks.fork()}>
        <props.children />
    </Inject>;
}

/**
 * @param {object} props
 * @param {() => unknown} props.children
 */
function SomePopoverComponent(props) {
    return inject(TASKS, Tasks.fork(), props.children);
}

• The child context is also considered pending if the parent has any pending tasks.
• The parent tasks instance is unaffected by it's children.
• Tasks.fork is a shorthand for new Tasks(extract(TASKS)).

Error Handling

Any errors thrown by tasks will result in unhandled rejections but will not affect the task system in any other way.