js-data-http Class: Component

new Component(opts)

The base class from which all JSData components inherit some basic functionality.

Typically you won't instantiate this class directly, but you may find it useful as an abstract class for your own components.

See Component.extend for an example of using Component as a base class.

import {Component} from 'js-data'

Method parameters:

Name Type Argument Description

opts

Object

Configuration options.

Properties

Name	Type	Argument	Default	Description
`debug`	Boolean	<optional>	false	See Component#debug.

Return value:

Type	Description
Component	A new Component instance.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 4

Members

_listeners

Event listeners attached to this Component. Do not modify. Use Component#on and Component#off instead.

Details

Type	Since	Source
Object	3.0.0	node_modules/js-data/src/Component.js, line 52

debug

Whether to enable debug-level logs for this component. Anything that extends Component inherits this option and the corresponding logging functionality.

Details

Type	Since	Default value	Source
Boolean	3.0.0	`false`	node_modules/js-data/src/Component.js, line 28

Example

// Normally you would do: import {Component} from 'js-data'
const JSData = require('js-data@3.0.0-beta.7')
const {Component} = JSData
console.log('Using JSData v' + JSData.version.full)

const component = new Component()
component.log('debug', 'some message') // nothing gets logged
// Display debug logs:
component.debug = true
component.log('debug', 'other message') // this DOES get logged

Methods

<static> extend(props, classProps)

Create a subclass of this Component:

Method parameters:

Name Type Argument Default Description

props

Object

{}

Properties to add to the prototype of the subclass.

Properties

Name	Type	Argument	Description
`constructor`	Object	<optional>	Provide a custom constructor function to be used as the subclass itself.

classProps

Object

{}

Static properties to add to the subclass.

Return value:

Type	Description
Constructor	Subclass of this Component class.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 68

Example

// Normally you would do: import {Component} from 'js-data'
const JSData = require('js-data@3.0.0-beta.7')
const {Component} = JSData
console.log('Using JSData v' + JSData.version.full)

// Extend the class using ES2015 class syntax.
class CustomComponentClass extends Component {
  foo () { return 'bar' }
  static beep () { return 'boop' }
}
const customComponent = new CustomComponentClass()
console.log(customComponent.foo())
console.log(CustomComponentClass.beep())

// Extend the class using alternate method.
const OtherComponentClass = Component.extend({
  foo () { return 'bar' }
}, {
  beep () { return 'boop' }
})
const otherComponent = new OtherComponentClass()
console.log(otherComponent.foo())
console.log(OtherComponentClass.beep())

// Extend the class, providing a custom constructor.
function AnotherComponentClass () {
  Component.call(this)
  this.created_at = new Date().getTime()
}
Component.extend({
  constructor: AnotherComponentClass,
  foo () { return 'bar' }
}, {
  beep () { return 'boop' }
})
const anotherComponent = new AnotherComponentClass()
console.log(anotherComponent.created_at)
console.log(anotherComponent.foo())
console.log(AnotherComponentClass.beep())

dbg(args)

Log the provided values at the "debug" level. Debug-level logs are only logged if Component#debug is true.

.dbg(...) is shorthand for .log('debug', ...).

Method parameters:

Name	Type	Argument	Description
`args`	*	<optional> <repeatable>	Values to log.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 123

emit(event, args)

Trigger an event on this Component.

Method parameters:

Name	Type	Argument	Description
`event`	String		Name of event to emit.
`args`	*	<optional> <repeatable>	Arguments to pass to any listeners.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 201

Example

// import {Collection, DataStore} from 'js-data'
const JSData = require('js-data@3.0.0-beta.7')
const {Collection, DataStore} = JSData

const collection = new Collection()
collection.on('foo', function (msg) {
  console.log(msg)
})
collection.emit('foo', 'bar')

const store = new DataStore()
store.on('beep', function (msg) {
  console.log(msg)
})
store.emit('beep', 'boop')

log(level, args)

Log the provided values. By default sends values to console[level]. Debug-level logs are only logged if Component#debug is true.

Will attempt to use appropriate console methods if they are available.

Method parameters:

Name	Type	Argument	Description
`level`	String		Log level.
`args`	*	<optional> <repeatable>	Values to log.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 133

off(event, listener)

Remove an event listener from this Component. If no listener is provided, then all listeners for the specified event will be removed. If no event is specified then all listeners for all events will be removed.

Method parameters:

Name	Type	Argument	Description
`event`	String	<optional>	Name of event to unsubsribe to.
`listener`	Function	<optional>	Listener to remove.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 179

        Examples
      
// Remove a particular listener for a particular event
collection.off('add', handler)
      // Remove a particular listener for a particular event
collection.off('add', handler)
    
// Remove all listeners for a particular event
record.off('change')
      // Remove all listeners for a particular event
record.off('change')
    
// Remove all listeners to all events
store.off()
      // Remove all listeners to all events
store.off()
    

on(event, listener, ctx)

Method parameters:

Name	Type	Argument	Description
`event`	String		Name of event to subsribe to.
`listener`	Function		Listener function to handle the event.
`ctx`	*	<optional>	Optional content in which to invoke the listener.

Details

Since	Source
3.0.0	node_modules/js-data/src/Component.js, line 146

        Examples
      
// Listen for all "afterCreate" events in a DataStore
store.on('afterCreate', (mapperName, props, opts, result) => {
  console.log(mapperName) // "post"
  console.log(props.id) // undefined
  console.log(result.id) // 1234
})
store.create('post', { title: 'Modeling your data' }).then((post) => {
  console.log(post.id) // 1234
})
      // Listen for all "afterCreate" events in a DataStore
store.on('afterCreate', (mapperName, props, opts, result) => {
  console.log(mapperName) // "post"
  console.log(props.id) // undefined
  console.log(result.id) // 1234
})
store.create('post', { title: 'Modeling your data' }).then((post) => {
  console.log(post.id) // 1234
})
    
// Listen for the "add" event on a collection
collection.on('add', (records) => {
  console.log(records) // [...]
})
      // Listen for the "add" event on a collection
collection.on('add', (records) => {
  console.log(records) // [...]
})
    
// Listen for "change" events on a record
post.on('change', (record, changes) => {
  console.log(changes) // { changed: { title: 'Modeling your data' } }
})
post.title = 'Modeling your data'
      // Listen for "change" events on a record
post.on('change', (record, changes) => {
  console.log(changes) // { changed: { title: 'Modeling your data' } }
})
post.title = 'Modeling your data'
    

Class: Component

new Component(opts)

Properties

Members

_listeners

debug

Methods

<static> extend(props, classProps)

Properties

dbg(args)

emit(event, args)

log(level, args)

off(event, listener)

on(event, listener, ctx)

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