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@version    0.15.5
@date       2017-04-16
@stability  2 - Unstable


A small, high-performance, feature-rich JavaScript framework for building single-page applications. LiteJS is an excellent choice for complex user interfaces that are redrawn often.

Weighing in at just 25KB (11KB gzipped), it includes everything you need to build a modern web application:

  • routed views with browser history management
  • reusable templates by custom element tags
  • asynchronous and dynamic code loading
  • translations with instant language switching - no page reload required
  • date parsing and formating date-format-lite
  • string formating
  • keyboard shortcuts
  • JSON Pointer [RFC 6901] and JSON Merge Patch [RFC 7396] implementation json-util

No dependencies.

See a working example with a source code in 80 lines.

It also supports SVG elements, so it is possible to build full SVG single-page applications.
See a example with a source code in 60 lines.


In short - an application consists of a presentation layer (UI) and a data layer (Model).

Presentation layer

Most template engines translates its own custom syntax to HTML string and then let browsers to parse HTML into a DOM.

HTML is a markup language for building DOM tree from a string.

LiteJS have a DOM-aware template engine, that bypasses HTML string part and turns templates directly to DOM nodes.

Declare elements and attributes with clear, well-indented CSS selectors.[href="#A"] My link
    li Item A
    li Item B


<a id="123" class="link bold" href="#A">My link</a>
    <li>Item A</li>
    <li>Item B</li>
<div class="footer">
    <button disabled="disabled" title="go"></button>
  • Type selector, attribute selectors, ID selectors, and pseudo-classes are supported. Child combinators can be used and you can leave off the tag to get a div.

Built-in plugins

Plugins starts with @ in template files.

  • @child - Content will be put there.
  • @def [route,...] [route|file,...] - Define routes and required files for them.
  • @el [name] - Create a new custom element.
  • @view [route] [parent] - Organize views into a hierarchy with built-in router.
    • Accepts Level 1 URI Templates RFC 6570.
    • Views starting with # are hidden without a route.
@el menu
        @el row
            a[href="#home"] Home
            a[href="#page/about"] About
@el footer
        i Bye
@view home #body
    h1 Home
@view page/{pageName} #body
    h1 Welcome to {route.pageName} page!
    section Hello World!

See it in action

Built-in bindings

Bindings starts with & in template files. Bindings are piece of JavaScript that will be run on rendering. Bindings ties together UI and Model.

  • &class: [name], [force] - Add a class to element.
  • &txt: [content] - Add plain text to element.
    &class: "is-selected", Math.random() > .5
    // :: is for one-time binding
    &txt:: this.href

Data layer

To detect and respond to changes LiteJS uses observables.

Item is a cached by id and observable Object.

List is a cached by name and observable Array of Items, that can be merged, sorted, filtered, paged and loaded asynchronously.


Defined global variables

  • El
  • View
  • Fn
// Optional path for views, default = "" 
View.base = "/js/views/"
// Define starting point in DOM 
View("body", document.body)
// Default view 
View.main = "home"
// is a root scope for elements, make View visible for templates = View

External links


Copyright (c) 2013-2016 Lauri Rooden <>
The MIT License