I am new to both vue.js and vuex. I have a component that need to dispatch an action when a specific data is available in the state. How can I do this.
Example:
export default {
name: 'MyComponent',
computed: {
targetItem() {
return this.$store.getters.getTarget(this.$route.params.id);
}
}
}
In the example above i would like to dispatch a new action on the store when targetItem has a value. This is so i can trigger an ajax request via a vuex action to collect more data about targetItem
Thanks
I eventually found a solution that work
export default {
name: 'MyComponent',
computed: {
targetItem() {
return this.$store.getters.getTarget(this.$route.params.id);
}
},
watch: {
shop (newVal, oldVal) {
if(!!newVal && !oldVal) {
const {targetItem} = this;
this.$store.dispatch('ACTION_NAME',{targetItem});
}
}
}
}
Thanks
Related
Essentially, in a Vue application, I have a page that lists Contacts. And a search form that is part of a header component. I capture the input search term as a state variable in the vuex store and track it as a computed variable.
I have a method to retrieve contacts that is called within the mounted hook. I want to call the same getContacts method again whenever the state search variable changes. Using a watcher to do this atm, but I have read that watching a computed value is not the right way. Wondering if there is a better way to do this. Script below.
<script>
import API from '#/utils/Api.js'
...
export default ({
...
tableData: [],
}
},
computed: {
search() {
return this.$store.getters.search;
}
},
mounted() {
this.getContacts();
},
methods: {
async getContacts() {
try {
const {data} = await API.get('/contacts?search=' + this.search)
this.tableData = data
} catch (e) {
console.error(e)
}
}
},
watch: {
search () {
this.getContacts();
}
}
})
</script>
Try to watch directly the state item and then pass the new value as parameter for the method, then use immediate:true to replace the mounted hook call :
export default ({
...
tableData: [],
}
},
methods: {
async getContacts(val) {
try {
const {data} = await API.get('/contacts?search=' + val)
this.tableData = data
} catch (e) {
console.error(e)
}
}
},
watch: {
'$store.getters.search': {
handler(newVal)
this.getContacts(newVal);
},
immediate:true
}
}
})
I have Vuex Store that will look like this
const config = {
featureA: { isEnabled: true, maxUser: 2 },
featureB: { isEnabled: false, maxData: 5 },
}
const actions = {
getDataCompany(context, payload) {
return new Promise(async (resolve, reject) => {
try {
const result = await firebase.firestore().collection(payload.collection).doc(payload.companyId).get()
if (result) {
if (payload.isLogin) await context.commit('setConfig', result.data())
return resolve(result.data())
}
reject(new Error('Fail To Load'))
} catch (e) {
reject(new Error('Connection Error'))
}
})
}
}
const mutations = {
setConfig(state, payload) {
state.config = payload
}
}
const getters = {
getData: ({ config }) => (feature, key) => {
const state = config
if (state) if (state[feature]) if (state[feature][key]) return state[feature][key]
return null
}
}
export default new Vuex.Store({
state: { config },
actions: { ...actions },
mutations: { ...mutations },
getters: { ...getters }
})
It's working fine with this method to get the data
computed: {
featureAEnabled() {
return this.$store.getters.getData('featureA', 'isEnabled')
},
}
But I have a problem when the data is change, the value is not update in component, and now I want to use mapGetters because it say can detect changes, But I have problem with the documentation and cannot find how to pass params here,
import { mapGetters } from 'vuex'
computed: {
...mapGetters({
featureAEnabled: 'getData'
})
}
I'am calling the action from here
async beforeMount() {
await this.$store.dispatch('getDataCompany', {collection: 'faturelsit', companyId: 'asep', isLogin: true})
}
And try to detect change in here
mounted() {
if (this.featureAEnabled) console.log('feature enabled')
}
The value change is not detected, and need to refresh twice before the changes is implemented in component
My main target is to detect if there any data change in Vuex and make action in component,
nevermind just working with watch without mapgetter,
I just realize that computed cannot re-run the mounted, so I make method that will called when the variable change in watch. thank you.
The main purpose is fulfilled, but the mapgetter with params is still not answered. so if anyone want to answer please share the way to use mapgetter with params.
You could try to use get and set methods for your computed property.
Example:
computed: {
featureAEnabled: {
get() {
return this.$store.getters.getData('featureA', 'isEnabled')
},
set(value) {
...update featureEnabled property in vuex store
}
},
}
When my application is started I make two requests to get some information (company and user informations) that I will use basically in all my components. I store this information in store.js
My App.vue
<template>
<router-view></router-view>
</template>
export default{
methods: {
getCompanyIndormation(){
//Vuex function to store company information
this.setCompanyInformation(someinformation)
},
getUserInformation(){
//Vuex function to store user information
this.setUserInformation(someinformation)
}
}
}
My store.js
export default new Vuex.Store({
state: {
user: {
id: '',
name: '',
},
company: {
name: '',
subdomain: ''
}
},
mutations: {
setUserInformation: (state, obj) => {
state.user.id = obj.id;
state.user.name = obj.name;
},
setCompanyInformation: (state, obj) => {
state.company.name = obj.name;
state.company.subdomain = obj.subdomain;
}
}
})
So far everything works perfectly. My problem was when I tried to retrieve some information from the company in a mixin I own.
My mixin.js
import { mapState } from 'vuex';
const myMixin = {
computed: {
...mapState(['company'])
},
methods: {
$getCompanyUrl(){
return 'https:// '+this.company.subdomain+'/contact'
}
}
}
My problem here is that in some cases the function of my mixin normally returns the entire url, for example: https://domain1.com/contact but sometimes it returns https:///contact, that is, he didn't find it still the domain. Does anyone have any suggestions on how I can solve this problem? Do I add a watcher to see when the company's information has changed in the store or do I expect to finish all initial requirements before even rendering the router-view?
Maybe just create a getter for company url in your store.
getters: {
companyUrl: state => `https://${state.company.subdomain}/contact`,
},
And then use mapGetters anywhere else. The getters are meant to be watching the state changes.
I have a child component that's basically a search box. When the user types something and presses enter, an event is fired that goes to the parent with the search topic:
export default {
name: "SearchBar",
methods: {
searchRequested(event) {
const topic = event.target.value;
this.$emit('searchRequested', topic);
}
}
};
The parent receives the event and updates a prop connected to other of its children (an image gallery):
<template>
<div id="app">
<SearchBar #searchRequested="onSearchRequested($event)" />
<Images :topic="topic" />
</div>
</template>
<script>
import SearchBar from './components/SearchBar.vue'
import Images from './components/Images.vue'
export default {
name: 'app',
components: {
SearchBar,
Images
},
data() {
return {
topic: ''
};
},
methods: {
onSearchRequested(topic) {
this.topic = topic;
}
}
}
</script>
So far, so good. But now I want the child component load itself with images related to the searched topic whenever the user performs a new search. For that, the child component Images must be aware of a change on its property topic, so I created a computed one:
import { ImagesService } from '../services/images.service.js';
export default {
data() {
return {
topic_: ''
};
},
methods: {
updateImages() {
const images = new ImagesService();
images.getImages(this.topic_).then(rawImages => console.log(rawImages));
}
},
computed: {
topic: {
get: function() {
return this.topic_;
},
set: function(topic) {
this.topic_ = topic;
this.updateImages();
}
}
}
};
But unfortunately, the setter never gets called. I have to say I'm new in Vue, so probably I'm doing something wrong. Any help will be appreciated.
You don't need to create computed in the main component. Images component is already aware of the changes in the topic prop.
You need to watch the changes of topic and do an async operation in 'Images.vue'. It's possible with Vue's watchers.
Vue docs watchers
'./components/Images.vue'
<template>...</template>
<script>
export defult {
props: ['topic'],
data(){
return {
images: []
}
},
watch: {
topic(newVal){
// do async opreation and update data.
// ImageSerice.get(newVal)
// .then(images => this.images = images)
}
}
}
</script>
I have a component, which looks like this:
export default {
name: 'todos',
props: ['id'],
created () {
this.fetchData()
},
data() {
return {
}
},
computed: {
todos () {
return this.$store.state.todos[this.id]
}
},
methods: {
async fetchData () {
if (!this.$store.state.todos.hasOwnProperty(this.id)) {
await this.$store.dispatch('getToDos', this.id)
}
}
}
}
This is what's happening:
The component receives an id via props.
When the component loads I need to fetch some data based on the id
I have a created() hook from where I call a function fetchData() to fetch the data.
In methods, the fetchData() function dispatches an action to get the data. This gets and stores the data in Vuex store.
The computed property todos gets the data for this id.
The problem is that when the page first loads, the computed property todos shows up as undefined. If I change the page (client side) then the computed property gets the correct data from the store and displays it.
I am unable to understand why computed property doesn't update?
You could use following approach:
component.vue (and just render todoItem)
methods: {
async fetchData () {
const _this = this;
if (!this.$store.state.todos.hasOwnProperty(this.id)) {
this.$store.dispatch('getToDos', {id: this.id, callback: () => {
_this.todoItem = _this.$store.state.todos[_this.id]
}});
}
}
}
store.js
actions: {
getToDos: (context, payload) => {
// simulate fetching externally
setTimeout(() => {
context.commit("getToDos__", {newId: payload.id, task: "whatever" });
payload.callback();
}, 2000);
},
Base on here
When this hooks is called, the following have been set up: reactive data, computed properties, methods, and watchers. However, the mounting phase has not been started, and the $el property will not be available yet.
I think what might solve it is if you create a getter for todos.
So in your VueX Store add:
getters: {
todos(state) {
return state.todos;
}
};
And than in your computed use:
computed: {
todos () {
return this.$store.getters.todos[this.id]
}
}