所以,我试图每次从组件中更新一些数据,vuex中的状态不是空的。我用laravel设置了一个API路由,在用户登录后返回用户信息。
API routes:
Route::group(['middleware' => ['auth:api']], function () {
Route::get('profil', 'Api\UserController@profil')->name('profile'); // will returning user info
}
Vuex:
export default new Vuex.Store({
state: {
token: localStorage.getItem('token') || "",
user: {}
},
getters: {
isAuth: state => {
return state.token != "" && state.token != null
}
},
mutations: {
SET_TOKEN(state, payload) {
state.token = payload
},
SET_AUTH_USER(state, payload) {
state.user = payload
}
}
})
所以在我的App.vue中, 在创建的方法中, 我提交了SET_AUTH_USER, 如果token存在的话, 就用http响应作为payload.
在我的App.vue中,我的方法是在创建方法中,如果token存在,我就提交SET_AUTH_USER,并将http响应作为有效载荷。
<template>
<div id="app-layout">
<section-advices></section-advices>
</template>
<script>
import SectionAdvices from "./SectionAdvices"
export default {
name: "app-layout",
components: {
SectionAdvices
},
created() {
if (this.$store.state.token !== (null || "")) { //check token in vuex state
this.$http
.get("/profil")
.then(res => {
if (res.status === 200) {
this.$store.commit("SET_AUTH_USER", res.data.data); //set $store.state.user with response
} else {
this.$store.commit("SET_AUTH_USER", null); // set with null
}
})
.catch(err => {
console.log(err);
});
}
}
}
</script>
每次我刷新页面时,只要我的本地存储中有token,用户对象就会有用户信息。
SectionAdvices.vue:
<template>
<section class="advices">
<input type="text" v-model="name">
<input type="text" v-model="email">
</section>
</template>
<script>
import { mapState, mapGetters, mapActions, mapMutations } from "vuex";
export default {
name: "section-advices",
data(){
return{
name: null,
email: null
}
},
computed:{
...mapState(["user"]),
...mapGetters(["isAuth"]),
},
created() {
if(this.isAuth) { //its returning true. the codes below was executed
this.name = this.user.name // gives name data with "undefined"
this.form.email = this.user.email // it's "undefined" too
}
}
}
</script>
SectionAdvices组件中的姓名和电子邮件都被设置为 "未定义",尽管在Vue开发工具中,用户对象确实有这些值。我是否在错误的生命周期中调用了App.vue中的api?
你可以尝试使用getters来获取状态数据吗?因为生命周期的关系。获取器是在组件页面渲染时先设置的
我找到了解决方法,那就是
按照@dreijntjens的建议,我在我的 "SectionAdvices.vue "中添加了watcher。
...
watch: {
// watching for store.state.user changes
user: {
handler: "fillForm", // call the method
immediate: true // this watcher will exec immediately after the comp. created
}
},
methods: {
fillForm() {
if(this.isAuth) { // this is not necessary, just want to make sure. Once isAuth === true, codes below will be executed
this.form.name = this.user.name
this.form.email = this.user.email
}
}
}
所以,真正的问题是,当SectionAdvices.vue创建并获取数据时,store.state.user还是一个空对象。我的API调用在这一步之后运行,这是毫无意义的。所以,我确实需要watcher,来查看用户状态的任何变化,并在这之后更新其组件内的本地数据。