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smart-observe

v1.0.4

Published

smart-observe comes from Vue.js and is a small, efficient library for observing changes of javascript Object, Array and Class.

Downloads

30

Readme

中文 | English

smart-observe

Build Status npm version js-standard-style

smart-observe comes from Vue.js and is a small, efficient library for observing changes of javascript Object, Array and Class.

Installation

npm install --save smart-observe

or

bower install --save smart-observe

Usage

To watch expression. observe.watch(target, expression, callback) or observe(target, expression, callback)

Try it on: codepen jsfiddle

const target = {a: 1}
observe(target, 'a', function (newValue, oldValue) {
  console.log(newValue, oldValue)
})
target.a = 3
// 3 1

To add computed property. observe.compute(target, name, getter)

Try it on: codepen jsfiddle

const target = {a: 1}
observe.compute(target, 'b', function () {
  return this.a * 2
})
console.log(target.b)
// 2
target.a = 3
console.log(target.b)
// 6

To watch expressions and computed properties. observe.react(options)

Try it on: codepen jsfiddle

const options = {
  data: {
    PI: Math.PI,
    radius: 1,
  },
  computed: {
    'area': function () {
      return this.PI * this.square(this.radius) // πr²
    },
  },
  watchers: {
    'area': function (newValue, oldValue) {
      console.log(`area: ${newValue}`)
    },
  },
  methods: {
    square (num) {
      return num * num
    },
  },
}
const target = observe.react(options)
target.radius = 3
// area: 28.274333882308138

API

properties

| name | type | value | detail | | --- | --- | --- | --- | | observe.deep | Boolean | The default is false | If true, observe.watch(target, expression, callback) will observe target deeply | | observe.sync | Boolean | The default is false | If true, observe.watch(target, expression, callback) will invoke callback immediately when a property change is detected | | observe.default | Function | Could only be one of observe.react, observe.watch and observe.compute. The default is observe.watch | Set actual method to observe.default for observe(...) |

methods

observe(...)

  • It's syntactic sugar of observe.default. See 'properties' for details

observe.watch(target, expression, callback)

  • target: Any object
  • expression: String or Function
  • callback: Function
  • Returns Watcher. And calling watcher.teardown() could unwatch expression

observe.compute(target, name, accessor, cache)

  • target: Any object
  • name: String
  • accessor:
    • Function: It will be the get of accessor
    • Object: Contains: (at least get or set)
      • get: Function
      • set: Function
      • cache: Boolean. Optional. The default is true. If false, the get will be evaluated whenever reading computed properties
  • cache: Boolean. Same as accessor.cache

observe.react(options, target)

  • options: Object. Contains:
    • data: It's the properties to add
    • computed: It's the computed properties to add
    • watchers: It's the watchers to watch properties or computed properties
    • methods: The methods to add. And these will bind to target
  • target: Any object. Optional. The default is empty object. It will be attached with the fields of options
  • returns target

License

MIT