literaljs

LiteralJS

~1kb JavaScript library for building user interfaces.

$ microbundle
Build output to build:
      1.13 kB: index.js
      1.14 kB: index.m.js
      1.19 kB: index.umd.js

Features and stuff

• Small: Only around 1kb in size.
• Virtual DOM: Diffing occurs on state update for more efficient DOM updates. Current and previous AST are diffed against each other.
• Lifecycle Methods: All DOM elements have the ability to trigger mounted and unmounted lifecycle functions using built-in JavaScript MutationObservers.
• One Global Store: One source of truth; State management libraries are less of a need.

API Function Index

• component
• render

Getting Started

Install

$ npm install literaljs

$ yarn add literaljs

Import

const Literal = require('literaljs');
// OR
import Literal from 'literaljs';
// OR
import { component, render } from 'literaljs';

ES6 Example

import { component, render } from 'literaljs';

const foo = component({
  render: ({ getState, setState }) => ({
    element: 'div',
    class: 'container',
    text: `This is the Count: ${getState().count}`,
    children: [
      {
        element: 'button',
        text: 'Click Me!',
        events: {
          type: 'click',
          action: () => {
            var state = getState();
            setState({ count: state.count + 1 });
          }
        }
      }
    ]
  })
});

render(foo, 'app', { count: 0 });

At the moment, all components are created with just objects. There is also more succinct markup and use for those who have access to ES6+ features like object destructuring.

In the near future regular html markup will be also possible as well!

component

The component function accepts objects with the following keys:

• props
• methods
• render

component props

The props of a component is an object which can be passed with anything that is normally valid in a JavaScript Object. This can include any data or functions.

The only component that can not recieve props is the root component that is passed to the Literal.render function.

Example:

const bar = component({
  render: ({ getState, setState, props }) => ({
    element: 'p',
    text: `Total: ${props.total}`
  })
});

const foo = component({
  render: ({ getState, setState }) => ({
    element: 'div',
    children: [
      bar({ props: { total: 9 } })
    ]
  })
});

component methods

The methods key of a component will accept a function which returns an object of other functions. Within the methods, you also have access to a components getState and setState functions which can be used accordingly. You also, have access to created methods directly within the render function.

Example:

component({
  methods: ({ getState, setState }) => ({
    increase: () => {
      const count = getState().count;
      setState({ count: count + 1 });
    }
  }),
  render: ({ getState, setState, methods: { increase }}) => ({
    element: 'button',
    text: `Current Count: ${getState().count}`,
    events: {
      type: 'click',
      action: () => increase()
    }
  })
});

component render

The render key of a component accepts a function that returns an JavaScript Object.

• Markup Syntax
• Properties

Markup Syntax

Markup is currently written with Objects with the following specified keys:

• element*
• text
• class
• id
• children
• events
  • lifecycle events

* = Required Key

element Key

The element key in the render function markup is the HTML node tag name as a String. For example, an element with the value

The element key is required when generating a new DOM node.

Example:

component({
  render: () => ({
    element: 'div',
  })
});
// Outputs: <div></div>

text Key

The text key in the render function markup accepts a String an will generate a text inside the element.

Example:

component({
  render: () => ({
    element: 'div',
    text: 'Hello World!'
  })
});
// Outputs: <div>Hello World!</div>

class Key

The class key in the render function markup is the HTML node class name as a String.

Example:

component({
  render: () => ({
    element: 'div',
    class: 'title'
  })
});
// Outputs: <div class="title"></div>

id Key

The id key in the render function markup is the HTML node class name as a String.

Example:

component({
  render: () => ({
    element: 'div',
    id: '2'
  })
});
// Outputs: <div id="2"></div>

Children Key

The children key in the render function markup is the childNodes of a given element or DOM Node. This key only accepts an Array of Objects. Each Object in this Array can be another Object that represents a new DOM Node.

Example:

component({
  render: () => ({
    element: 'div',
    children: [
      {
        element: 'span'
      }
    ]
  })
});
// Outputs: <div id="2"></div>

Events Key

The events key in the render function markup accepts either an Array of events or a single event Object.

An event object has two keys:

• type (Event Name)
• action (Function To Trigger)

Example:

// An Array Of Events
component({
  render: () => ({
    element: 'button',
    text: 'Click Me!',
    events: [
      {
        type: 'click'
        action: () => console.log('Hello World!')
      }
    ]
  })
});
// Output in Console: Hello World!
// OR
component({
  render: () => ({
    element: 'button',
    text: 'Click Me!',
    events: {
      type: 'click'
      action: () => console.log('Hello World!')
    }
  })
});

Lifecycle Events

Besides the common event handlers like click, there are two lifecycle events that LiteralJS includes that can be attached to any DOM node.

To do so, just name the type value unmounted or mounted` to trigger functions when a DOM node is first placed in the DOM or removed from the DOM.

Example: Example:

component({
  render: () => ({
    element: 'div',
    text: 'I have a life!',
    events: [
      {
        type: 'mounted'
        action: () => console.log('I\'m on the page!')
      },
      {
        type: 'unmounted'
        action: () => console.log('I\'m off the page!')
      }
    ]
  })
});

Other Keys Not Listed

Other keys are also accepted in a DOM object, such as data and other custom keys.

Properties

Within the render function of a component, you have access to other functions and objects:

• getState
• setState
• props
• methods

getState

The getState function of the components render method will allow you to access the global store of your application.

setState

The setState function of the components render method accepts an object which will allow you to set new values for particular pieces of state in the global store

props

The props object of the components render method can contain any number of data types and functions. The only componentthat cannot containpropsis the rootcomponentthat is passed to theLiteral.render` method.

methods

The methods object allow you to access other functions defined directly in the component. You can use this as a way to organize other pieces of logic and keep the render function much cleaner.

render

The Literal.render function is responsible for parsing the AST that is provided with components, injecting the generated markup into the specific DOM node, diffing any new changes based on state, and setting the default application state.

The Literal.render function can accept 3 arguments, one of which is optional.

• The root component.
• The String id of the DOM node to inject generated markup with.
• (Optional) The default state as an Object

Example:

Literal.render(component, 'app', { count: 0 });
// or
render(component, 'app');