How to access Vuex module getters and mutations?

问题

I'm trying to switch to using Vuex instead of my homegrown store object, and I must say I'm not finding the docs as clear as elsewhere in the Vue.js world. Let's say I have a Vuex module called 'products', with its own state, mutations, getters, etc. How do I reference an action in that module called, say, 'clearWorking Data'? The docs give this example of accessing a module's state:

store.state.a // -> moduleA's state

But nothing I can see about getters, mutations, actions, etc.

回答1:

In your example it would be store.dispatch('products/clearWorkingData') you can think of actions/mutations as a file system in a way. The deeper the modules are nested the deeper in the tree they are.

so you could go store.commit('first/second/third/method') if you had a tree that was three levels deep.

回答2:

In Addition to the accepted answer I wanna provide you with a workarround for the getter which is missing in the answer.

Debug the Store
In any case you can call console.log(this.$store) to debug the Store.
If you do so you will see the getters are prefixed with the namespace in their name.

Access namespaced getter
this.$store.getters['yourModuleName/someGetterMethod']

Dispatch namespaced
this.$store.dispatch('yourModuleName/doSomething')

Dispatch namespaced with params
this.$store.getters['yourModuleName/someGetterMethod'](myParam)

Conclusion
The key is to handle the namespace like a file System like Justin explained.

Edit: found a nice library for handling vuex Store
In addition to the basic knowledge I'd like to add this vuex library as a nice addition for working effectivly and fast with the vuex store. https://github.com/davestewart/vuex-pathify .
It looks pretty interesting and cares much of the configuration for you and also allows you to handle 2waybinding directly with vuex.

** Edit: Thanks to the other Answers. Added Dispatching method with params for wholeness.

回答3:

As another addition to the accepted answer, if you need to pass parameter(s) to the getter (for instance to fetch a specific item from the store collection), you need to pass it as follows:

this.$store.getters['yourModuleName/someGetterMethod'](myParam)

I don't think I like this notation very much, but it is what it is - at least for the moment.

回答4:

Using Vuex mapGetters and mapActions you can now do this pretty easily. But I agree, it still isn't very obvious in the documentation.

Assuming your store module 'products' has a getter called 'mostPopular' and an action called 'clearWorkingData':

<template>
 <div>
  <p>{{mostPopularProduct}}<p>
  <p><button @click="clearProductData">Clear data</button></p>
 </div>
</template>
<script>
import { mapGetters, mapActions } from "vuex";

export default {
 computed: mapGetters({
  mostPopularProduct: "products/mostPopular"
 }),
 methods: mapActions({
  clearProductData: "products/clearWorkingData"
 })
}
</script>

回答5:

The mapGetters helper simply maps store getters to local computed properties:

    import { mapGetters } from 'vuex'

    export default {
  // ...
  computed: {
    // mix the getters into computed with object spread operator
    ...mapGetters([
      'doneTodosCount',
      'anotherGetter',
      // ...
    ])
  }
}
If you want to map a getter to a different name, use an object:

    ...mapGetters({
  // map `this.doneCount` to `this.$store.getters.doneTodosCount`
  doneCount: 'doneTodosCount'
})

来源：https://stackoverflow.com/questions/41833424/how-to-access-vuex-module-getters-and-mutations