When is it appropriate to utilize a dispatch instead of a commit?
From my understanding, a commit initiates a mutation while a dispatch triggers an action.
But can't we consider a dispatch as its own type of action as well?
When is it appropriate to utilize a dispatch instead of a commit?
From my understanding, a commit initiates a mutation while a dispatch triggers an action.
But can't we consider a dispatch as its own type of action as well?
Correctly stated, the $dispatch
function triggers an action, while commit
triggers a mutation. Here is how you can utilize these concepts:
Use $dispatch
in your methods within routes/components to send a message to the vuex store for performing an action. This action can be executed at any time after the current tick to prevent frontend performance issues.
Avoid using commit
directly in components/routes. It should only be used within an action and when there is data to commit. This is because commit is synchronous and could freeze the frontend until completed.
For instance, if you need to fetch JSON data from a server asynchronously to prevent UI unresponsiveness, simply trigger an action with $dispatch
. The action will then handle fetching the data and updating the state accordingly.
If you require knowledge about when an action is complete to display an AJAX spinner, consider returning a Promise as demonstrated below (e.g., loading current user):
Define the "loadCurrentUser" action like this:
actions: {
loadCurrentUser(context) {
return new Promise((resolve, reject) => {
this.$http.get("/api/current-user").then(response => {
context.commit("saveCurrentUser", response.body)
resolve()
}, response => {
reject()
})
})
},
// Additional actions
}
In the mutations handler, all commits originating from actions are managed. Define the "saveCurrentUser" commit as follows:
mutations: {
saveCurrentUser(state, data) {
Vue.set(state, "currentUser", data)
},
// More commit handlers (mutations)
}
In your component's created
or mounted
hook, call the action like this:
mounted: function() {
this.$store.dispatch("loadCurrentUser").then(response => {
console.log("Data received, now display content")
}, error => {
console.error("No data retrieved. Prompt user to check internet connection.")
})
}
Optionally returning a Promise as described above is a design choice not favored by everyone. For a detailed discussion on whether to use Promises or not, refer to the comments under this answer:
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