Hyperd

Virtual DOM based, template engine agnostic, a lightweight view library.

var component = hyperd(document.getElementById('count'), function() {
  return '<div id="count">Counter: ' + this.data.count + '</div>';
});

component.data.count = 0;

setInterval(function() {
  component.data.count++;
}, 1000);

Installation

$ npm install hyperd

<script src="node_modules/hyperd/hyperd.js"></script>

With Bower

$ bower install hyperd

Features

• Virtual DOM diffing
• Template engine agnostic
• Auto-redrawing
• Building reusable components
• Small API

Examples

• Counter
• Counter Component
• TodoMVC (source)

API Documentation

hyperd(node, render)

• node HTMLElement Node to attach
• render Function Called upon redrawing, should return a html string.
• Return: hyperd.Component

A short circuit to create a simple component instance.

Class: hyperd.Component

The base component class.

Class Method: hyperd.Component.extend(proto);

• proto Object protoype object
• Return: Function A new component constructor

Creates a new component class.

var MyComponent = hyperd.Component.extend({
  render: function() {
    return '<div>hi</div>';
  }
});

new hyperd.Component([props])

• props Object properties

In classes that extends hyperd.Component, make sure to call the super constructor so that the all settings can be initialized.

hyperd.Component.extend({
  constructor: function(props) {
    hyperd.Component.apply(this, arguments);
    ...
  }
});

component.props

The properties of the component.

var component = new MyComponent({ foo: "hi" });
console.log(component.props.foo); // "hi"

component.data

The state data of the component. Mutating data triggers UI updates.

component.node

The node element which the component is attached to.

component.components

Definitions of child components. You can use defined components like a custom element on render().

var Child = hyperd.Component.extend({
  render: function() {
    return '<div>' + this.props.foo + '</div>';
  }
});

hyperd.Component.extend({
  components: { child: Child },
  render: function() {
    return  '<div><child foo="hi"></div>'
  }
});

component.attachTo(node)

• node HTMLElement
• Return: this

Attaches the component to a DOM node.

component.render()

• Return: String A html string to render.

Note: implement this function, but do NOT call it directly.

Reuired to implement. This method is called automatically and asynchronously when you update component.data.

component.destroy()

Teardown and delete all properties and event bindings including descendant components.

component.emit(event[, args1][, args2][, ...])

• event String The event type to be triggered.
• Return: this

Trigger a DOM event for component.node with the supplied arguments.

component.emit('edit', arg);

component.on(event, listener)

• event String The event type.
• listener Function
• Return: this

Add a listener for the specified event.

component.on('render', function() { ... });

component.on(event, selector, listener)

• event String The event type.
• selector String CSS selector.
• listener Function The listener always take an event object as the first argument.
• Return: this

Add a listener for the delegated event. The listener is called only for descendants that match the selector. You can use this to listen an event of a child component too.

hyperd.Component.extend({
  constructor: function() {
    hyperd.Component.apply(this, arguments);
    this.on('click', 'button', function(event) {
      console.log('clicked!');
    });
  }
  render: function() {
    return  '<div><button type="button">Click me!</button></div>'
  }
});

component.removeListener(event, listener)

Remove a listener for the specified event.

component.removeListener(event, selector, listener)

Remove a listener for the delegated event.

component.removeAllListeners([event][, selector])

Remove all listeners, or those of the specified event or the delegated event.

component.onAttach()

Called upon after the component is attached to a node.

component.onRender()

Called upon after the component is rerendered.

component.onDestroy()

Called upon after the component is destroyed.

Event: 'attach'

The same as component.onAttach.

component.on('attach', function() { ... });

Event: 'render'

The same as component.onRender.

Event: 'destroy'

The same as component.onDestroy.

Attribute: 'data-hkey'

The identifier used to differentiate a node. Used to reconcile an element will be reordered or destroyed.

hyperd.Component.extend({
  render: function() {
    var items = ['foo', 'bar', 'baz'];
    return '<ul>' + items.map(function(item) {
      return '<li data-hkey="' + item + '">' + item + '</li>';
    }) + '</ul>';
  }
});

Licence

MIT