我刚开始在这里学习Vuex。到目前为止,我一直在store.js
文件中存储共享数据,并在每个模块中导入store
,但这样会变得令人讨厌,而且我很担心变化状态。使用Vuex进行异步呼叫
我在苦苦挣扎的是如何使用Vuex从Firebase导入数据。根据我的理解,只有行为可以进行异步调用,但只有突变才能更新状态?
现在我正在从我的突变对象调用firebase,它似乎工作正常。老实说,所有的上下文,提交,调度等似乎有点过载。我希望能够使用必要的最低数量的Vuex来提高生产力。
在文档中,它看起来像我可以编写一些代码,用于更新像下面这样的突变对象中的状态,将它导入computed
属性中的组件,然后使用store.commit('increment')
触发状态更新。这似乎是使用Vuex所需的最低金额,但接下来的行动是在哪里进行的?困惑:(上的最佳方法任何帮助做到这一点或最佳实践,将不胜感激!
const store = new Vuex.Store({
state: {
count: 0
},
mutations: {
increment (state) {
state.count++
}
}
})
我的代码如下
store.js
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex);
const db = firebase.database();
const auth = firebase.auth();
const store = new Vuex.Store({
state: {
userInfo: {},
users: {},
resources: [],
postKey: ''
},
mutations: {
// Get data from a firebase path & put in state object
getResources: function (state) {
var resourcesRef = db.ref('resources');
resourcesRef.on('value', snapshot => {
state.resources.push(snapshot.val());
})
},
getUsers: function (state) {
var usersRef = db.ref('users');
usersRef.on('value', snapshot => {
state.users = snapshot.val();
})
},
toggleSignIn: function (state) {
if (!auth.currentUser) {
console.log("Signing in...");
var provider = new firebase.auth.GoogleAuthProvider();
auth.signInWithPopup(provider).then(result => {
// This gives you a Google Access Token. You can use it to access the Google API.
var token = result.credential.accessToken;
// The signed-in user info.
var user = result.user;
// Set a user
var uid = user.uid;
db.ref('users/' + user.uid).set({
name: user.displayName,
email: user.email,
profilePicture : user.photoURL,
});
state.userInfo = user;
// ...
}).catch(error => {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// The email of the user's account used.
var email = error.email;
// The firebase.auth.AuthCredential type that was used.
var credential = error.credential;
// ...
});
} else {
console.log('Signing out...');
auth.signOut();
}
}
}
})
export default store
main.js
import Vue from 'vue'
import App from './App'
import store from './store'
new Vue({
el: '#app',
store, // Inject store into all child components
template: '<App/>',
components: { App }
})
App.vue
<template>
<div id="app">
<button v-on:click="toggleSignIn">Click me</button>
</div>
</template>
<script>
import Hello from './components/Hello'
export default {
name: 'app',
components: {
Hello
},
created: function() {
this.$store.commit('getResources'); // Trigger state change
this.$store.commit('getUsers'); // Trigger state change
},
computed: {
state() {
return this.$store.state // Get Vuex state into my component
}
},
methods: {
toggleSignIn() {
this.$store.commit('toggleSignIn'); // Trigger state change
}
}
}
</script>
<style>
</style>
这是非常详细的诚实。为什么'fetchData'不能直接更新'saveDate'?突变看起来多余。 – Martian2049