如果没有init的延迟,Reflux触发器将无法工作

Question

我使用了Reflux,通常我在进行ajax调用后触发,并且运行良好.出于测试目的,我不需要ajax调用,并且我注意到除非我给出最小5ms的超时,否则触发器将不起作用.这是工作而不是工作的例子.

不工作的例子:

window.threadStore = Reflux.createStore
  init: ->
    @state = @getInitialState()
    @fetchThreads()
  getInitialState: ->
    loaded: false
    threads: []
  fetchThreads: ->
    # ajax call for not Testing, and just trigger for Testing
    @state.threads = FakeData.threads(20)
    @state.loaded = true
    @trigger(@state) # This will NOT work!

window.threadStore = Reflux.createStore
  init: ->
    @state = @getInitialState()
    @fetchThreads()
  getInitialState: ->
    loaded: false
    threads: []
  fetchThreads: ->
    # ajax call for not Testing, and just trigger for Testing
    @state.threads = FakeData.threads(20)
    @state.loaded = true
    setTimeout( =>
      @trigger(@state) # This WILL work!
    , 500)

window.threadStore = Reflux.createStore
  init: ->
    @state = @getInitialState()
    @fetchThreads()
  getInitialState: ->
    loaded: false
    threads: []
  fetchThreads: ->
    # ajax call for not Testing, and just trigger for Testing
    @state.threads = FakeData.threads(20)
    @state.loaded = true
    @trigger(@state) # This will NOT work!

你能解释一下为什么它没有延迟就可以工作吗？这是一个我不明白的错误.

Answer 1

这是因为组件从中获取空数组,getInitialState并且trigger在调用之后发生.

init在创建商店实例fetchThreads时调用,这意味着在安装组件之前立即调用触发器.当稍后安装侦听组件时,它将从存储中获取空数组getInitialState.

我建议进行以下更改:

window.threadStore = Reflux.createStore
  init: ->
    @state =
      loaded: false
      threads: []
    @fetchThreads()
  getInitialState: ->
    @state # TODO: State should be cloned for sake of concurrency
  fetchThreads: ->
    # NOTE: Assign a new state for the sake of concurrency
    @state = 
      loaded: true
      threads: FakeData.threads(20)
    @trigger(@state) # This will SHOULD work now ;-)