I am new to Vuex and I am trying a simple test using a getter to return a data property from the state. I'm attempting to display the returned data on the page.
COMPONENT.VUE
<template>
<div class="section" >
<div class="section-content">
<p>{{test.title}}</p>
</div>
</div>
</template>
<script>
export default {
name: 'startNewSearch',
computed: {
getTest() { return this.$store.getters.getTest }
}
}
</script>
GETTERS.JS
export default {
getTest(state) {
return state.test
}
}
STORE.JS
import Vue from 'vue'
import Vuex from 'vuex'
import actions from './actions'
import mutations from './mutations'
import getters from './getters'
Vue.use(Vuex);
export const store = new Vuex.Store({
state: {
newSearch: {},
test: {
title: 'Test',
msg: 'This is a test message'
}
},
getters,
mutations,
actions
})
The error that I get is that test is- Property or method "test" is not defined on the instance but referenced during render. Is there another step to saving the data to the component that I missed?
Related
I am developing a single-page-application using vue-cli3 and npm.
The problem: Populating a basic integer value (stored in a vuex state) named counter which was incremented/decremented in the backend to the frontend, which displays the new value.
The increment/decrement mutations are working fine on both components (Frontend/Backend), but it seems like the mutations don't work on the same route instance: When incrementing/ decrementing the counter in backend, the value is not updated in the frontend and otherwise.
store.js:
Contains the state which needs to be synced between Backend/Frontend.
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
export default new Vuex.Store({
state: {
counter: 10
},
mutations: {
increment (state) {
state.counter++
},
decrement (state) {
state.counter--
}
}
})
index.js:
Defines the routes that the vue-router has to provide.
import Vue from 'vue'
import Router from 'vue-router'
import Frontend from '#/components/Frontend'
import Backend from '#/components/Backend'
Vue.use(Router)
export default new Router({
routes: [
{
path: '/',
name: 'Frontend',
component: Frontend
},
{
path: '/backend',
name: 'Backend',
component: Backend
}
],
mode: 'history'
})
main.js:
Inits the Vue instance and provides the global store and router instances.
import Vue from 'vue'
import App from './App'
import router from './router'
import { sync } from 'vuex-router-sync'
import store from './store/store'
Vue.config.productionTip = false
sync(store, router)
new Vue({
router,
store,
render: h => h(App)
}).$mount('#app')
Frontend.vue/Backend.vue:
Both (Frontend/Backend) use the same code here.
They use the state counter in order to display and modify it.
<template>
<div> Counter: {{ getCounter }}
<br>
<p>
<button #click="increment">+</button>
<button #click="decrement">-</button>
</p>
</div>
</template>
<script>
export default {
name: 'Frontend',
methods: {
increment () {
this.$store.commit('increment')
},
decrement () {
this.$store.commit('decrement')
}
},
computed: {
getCounter () {
return this.$store.state.counter
}
}
}
</script>
It would be awesome if someone sould tell me what I am missing or if I have misunderstood the concept of vuex and vue-router.
Just get the counter from the store for both components. You don't need data as store is already reactive.
<template>
<div> Counter: {{ counter }}
<br>
<p>
<button #click="increment">+</button>
<button #click="decrement">-</button>
</p>
</div>
</template>
<script>
import { mapState, mapMutations } from 'vuex';
export default {
name: 'Frontend',
methods: {
...mapMutations([
'increment',
'decrement',
])
},
computed: {
...mapState({
counter: state => state.counter,
})
}
}
</script>
For reference:
mapState: https://vuex.vuejs.org/guide/state.html#the-mapstate-helper
mapMutations: https://vuex.vuejs.org/guide/mutations.html#committing-mutations-in-components
#sebikolon component properties that are defined in data () => {} are reactive, methods are not, they are called once. Instead of {{ getCounter }}, just use {{ $store.state.counter }}. OR initiate property in each component that gets the value of your state.
data: function () {
return {
counter: $store.state.counter,
}
}
while I am trying to load page it's showing me error "TypeError: Cannot read property 'state' of undefined". As per documentation I have tried this bus not loading store.
<template>
<div>
</div>
</template>
<script>
import { store } from '#/components/tenant/store/store'
import Vue from 'vue'
export default {
store:store,
data: () => {
return {
}
}
}
store.js
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
export const userStore = new Vuex.Store({
state: {}
})
Maybe I have misunderstood your question, but since you're exporting the const userStore, don't you need to do the following:
import { userStore } from '#/components/tenant/store/store';
So I'm experimenting with a new project created with vue cli, where I am using router and VueX
So in my HelloWorld.vue file, I've got this code in the script section:
import { mapState } from 'vuex'
export default {
name: 'hello',
computed: mapState({
msg: 'nombre'
}),
Is there a more direct way of calling values in the state?, like for example I would like to do
msg: store.nombre
My vuex store is defined in the root main.js like this:
//vuex
import Vuex from 'vuex'
Vue.use(Vuex)
const store = new Vuex.Store({
state: {
nombre: "POS vuex"
}
});
new Vue({
el: '#app',
router,
store,
template: '<App/>',
components: { App }
})
Actually I was looking for this way:
msg: this.$store.state.nombre
(I was missing the ".state." part)
As soon as you're using mapState as computed you can actually call these states with this in that component - in the template or script section:
Use the ... operator on your mapState and you're done:
Example:
Your store:
const store = new Vuex.Store({
state: {
nombre: "POS vuex",
otherState: "abc",
anotherState: "efg"
}
});
Your component:
<template>
<div id="test">
{{ nombre }}
{{ otherState }}
</div>
</template>
<script>
import { mapState } from 'vuex'
export default {
name: 'hello',
methods: {
logState() {
console.log(this.anotherState);
}
},
computed: {
...mapState(["nombre", "otherState", "anotherState"]),
}
}
</script>
In addition to the the mapState helper
computed: {
...mapState('moduleOne', ['keyOne', 'keyTwo'])
}
which lets you access the values via this.keyOne and this.keyTwo inside your component.
You can also add your store to the root vue instance and access your state inside your components via the global this.$store directive.
this.$store.module.keyOne
this.$store.module.keyTwo
Additionally if you need to access your store from outside your components you can also export the store and import it directly from non-component code.
If you export your store:
import Vue from 'vue'
import Vuex from 'vuex'
import moduleTwo from './modules/moduleOne'
import moduleOne from './modules/moduleTwo'
Vue.use(Vuex)
const store = new Vuex.Store({
strict: true,
modules: {
moduleOne,
moduleTwo
}
})
export default store
You can import it anywhere you need to access state, getters, actions, and mutations.
import store from '#/store'
console.log(store.state.moduleOne.keyone)
store.dispatch('moduleOne/actionOne', { keyOne: valOne })
store.getters['moduleOne/getterOne']
store.commit('moduleOne/mutationOne', data)
Call you'r state in created method of vuex.
THanks
I've been playing around with Vue.js for the first time and so far, very cool framework.
One scenario I encountered was trying to pass an object from the parent component to a child, then iterate using v-for directive. I went through the documentation and thought I could pass the object through props but I have a feeling since favoriteObj is a computed data object, it has to do with the rendering sequence as I am getting this in the console:
vue.esm.js?efeb:571 [Vue warn]: Property or method "favoriteObj" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.
found in
---> <FavItem> at src/components/FavItem.vue
<FavoriteStuff> at src/components/FavoriteStuff.vue
<App> at src/App.vue
<Root>
Thanks for any info.
Parent:
<template>
<div>
<fav-item :favoriteObj="favoriteObj" ></fav-item>
</div>
</template>
<script>
import {mapGetters} from 'vuex'
import FavItem from '#/components/FavItem'
export default{
name: 'FavoriteStuff',
data (){
return{
uid: localStorage.getItem('_uid'),
}
},
computed: {
...mapGetters([
'favoriteObj'
])
},
created (){
this.$store.dispatch('getFavoriteStuff', {uid: this.uid})
},
components: {FavItem}
}
</script>
Child:
<template>
<div>
<ul class="list-group rpe-list">
<li v-for="item in favoriteObj" :key="item.id" class="list-group-item rpe-item">{{item.fav.name}}</li>
</ul>
</div>
</template>
<script>
export default{
name: 'FavItem',
props: ['favoriteObj']
}
</script>
VUEX Code
actions
export const getFavoriteStuff = ({commit}, {uid}) => {
let favoriteStuff = db.ref( 'stuff-favorites/' + uid );
return favoriteStuff.on('value', function(snapshot){
console.log(snapshot.val)
let favStuff = [];
let idx_counter = 0;
snapshot.forEach(child =>{
idx_counter++;
console.log(child.key)
db.ref('stuff-detail/' + child.key).once('value', function(snapshot){
console.log(snapshot.val())
let obj = {
id: child.key,
recipe: snapshot.val()
}
favStuff.push(obj)
})
})
if (idx_counter === snapshot.numChildren()){
commit('favoriteObj', favStuff)
}
})
}
mutations
export const favoriteObj = (state, payload) => {
state.favoriteObj = payload
}
getter
export const favoriteObj = state => state.favoriteObj;
index
import Vue from 'vue'
import Vuex from 'vuex'
import 'vue-awesome/icons'
import Icon from 'vue-awesome/components/Icon'
import * as getters from './getters'
import * as actions from './actions'
import * as mutations from './mutations'
Vue.use(Vuex)
Vue.component('icon', Icon)
// Define values which will be stored as client-side state
const state = {
favoriteObj: ""
};
// Initialize a store with our getters, actions, mutations, state.
const store = new Vuex.Store({
state,
getters,
actions,
mutations
});
export default store
EDIT:
This was due to a type at the end of my Child component. I simply forgot to close a </script
My component does not update the loaded property when Store.loaded changes:
Component
import { Vue } from 'vue-property-decorator'
import Component from 'nuxt-class-component'
import { Store } from '../repositories'
#Component
export default class Layout extends Vue {
loaded = Store.loaded
}
Store
class Root {
loaded = false
}
export let Store = new Root()
export default Store
In your example Store is just plain function (class), without any reactivity (no Vue watchers attached for Store.loaded field).
Only properties inside component's data are reactive. If you want reactive single store outside of vue components (better for big frontend applications), you should use Vuex
Simple example will be:
App.vue:
<script>
import { mapGetters, mapMutations } from 'vuex';
import store from './store';
import ChildComponent from './components/ChildComponent.vue';
export default {
store,
components: { ChildComponent },
methods: {
...mapMutations(['toggleLoaded']),
},
computed: {
...mapGetters({
isLoaded: 'isLoaded',
}),
}
}
</script>
<template>
<div id="app">
Toggle loaded
<h3>Root component: </h3>
<div>The loaded flag is: {{ isLoaded }}</div>
<ChildComponent />
</div>
</template>
components/ChildComponent.vue:
<script>
import { mapGetters } from 'vuex';
export default {
computed: {
...mapGetters({
isLoaded: 'isLoaded', //accessing to same data, as root through single Vuex state
}),
}
}
</script>
<template>
<div class="hello">
<h3>Child component</h3>
<div>The loaded flag is: {{ isLoaded }}</div>
</div>
</template>
And reactive Vuex store:
store/index.js:
import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex);
const state = {
loaded: false
};
const getters = {
isLoaded: state => state.loaded,
};
const mutations = {
toggleLoaded: (state) => {
state.loaded = !state.loaded;
}
};
export default new Vuex.Store({
state,
mutations,
// actions,
getters,
strict: true
});
You can find full source of this example on GitHub.