Snabbful

Snabbful is a simple, fast, and flexible library for building user interfaces by using Snabbdom. We add a state management layer on top of Snabbdom, and we provide a simple API for building user interfaces.

Installation

npm install snabbful

Table of Contents

• Usage
• Ref API
  • watch
  • commit
  • snapshot
  • emit
  • on
  • keep
  • lose

Usage

State management

There's no need to use useState or useReducer hooks, you can change the state directly.

import { initComponent } from 'snabbful';
import { h } from 'snabbdom';

const component = initComponent([eventListenersModule]);

interface State {
  count: number;
}

function View(state: State) {
  return h('div', [
    h('button', {
      on: {
        click: () => {
          state.count++;
        },
      },
    }, 'Increment'),
    h('div', `Count: ${state.count}`),
  ]);
}

const [ViewComponent, viewState] = component(View, { count: 0 });

setInterval(() => {
  viewState.count++;
}, 1000);

JSX rendering

import { initComponent } from 'snabbful';
import { jsx, init, toVNode, eventListenersModule } from 'snabbdom';

const component = initComponent([eventListenersModule]);
const patch = init([eventListenersModule]);
const div = document.querySelector('#app');

interface State {
  count: number;
}

function View(state: State) {
  return (
    <div>
      <button
        on={{
          click: () => {
            state.count++;
          },
        }}
      >
        Increment
      </button>
      <div>{`Count: ${state.count}`}</div>
    </div>
  );
}

const [ViewComponent, viewState] = component(View, { count: 0 });

setInterval(() => {
  viewState.count++;
}, 1000);

patch(toVNode(div), <ViewComponent></ViewComponent>);

Ref API

Use ref to get the reference of the state.

import { initComponent, ref } from 'snabbful';

interface State {
  count: number;
}

function View(state: State) {
  return <div>{`Count: ${state.count}`}</div>;
}

const [ViewComponent, viewState] = component(View, { count: 0 });

// Get the reference of the state
const r = ref(viewState);

watch

Use watch to watch the state changes.

viewState.count ++;

// Watch the state changes
ref(viewState).watch(() => {
  console.log(`State has changed`);
});

You can also watch the specific property of the state.

viewState.count ++;

// Watch the specific property of the state
ref(viewState).watch(() => {
  console.log(`Count property has changed`);
}, 'count');

NOTE: The re-rendering listener is also a state watcher.

commit

Use commit to commit the state changes.

In normal cases, you don't need to use commit, because the state changes will be committed automatically. But if there're many state changes, you can use commit to avoid unnecessary re-rendering.

// This will cause re-rendering only once
ref(viewState).commit((state) => {
  state.count++;
  state.count+=2;
  state.count-=3;
});

You can also disable re-rendering by passing true as the second argument, and that will also cancel all state watchers.

// Cancel all state watchers
ref(viewState).commit((state) => {
  state.count++;
}, true);

snapshot

Use snapshot to take a snapshot of the state. A snapshot is a copy of the state.

const s = ref(viewState).snapshot();

emit

Use emit to emit an event. This is useful when you want to communicate between components.

ref(viewState).emit('event', 'data');

on

Use on to listen to an event.

ref(viewState).on('event', (data) => {
  console.log(data);
});

keep

Use keep to persist the data between re-rendering.

function View(state: State) {
  // child will be initialized only once
  const child = ref(state).keep(() => <div>Child</div>);
  return <div>{child}</div>;
}

lose

Use lose to erase the persisted data.

function View(state: State) {
  const child = ref(state).keep(() => <div>Child</div>, 'child');
  ref(state).lose('child');
  return <div>{child}</div>;
}