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Basics concepts to start working with Vue.
How to read these codes snippetsVue components contain in the same place <script>, <template> and <style> data contents. In order to distinguish them:
Italic code is for script. Regular code is for template. |
Directivesv-if / v-else-if / v-else | Condition | <section v-show=’var == true’>show me</section> | v-show | Condition (no alternative) | <section v-if=’var == true’>show me</section> | v-for | Loop (iterate dataStore elt) | <li v-for=’elt in dataStoreElt’>...</li> | v-on:event (@event) | Event listener | <button v-on:click=’function’>Click!</button> | v-bind:elt (:elt) | Bind | <li v-bind:href=’dataStoreElt.prop’>...</li> | v-model | Bind forms | <input type=’text’ v-model=’dataStoreElt’ /> | | | |
Share data between parent/child componentsDirect data sharing between 2 linked components is possible in 3 ways: props & slot for parent communicating to child, and $emit for child communicating to parent. |
props (Parent > Child)Parent / | Child / | import Child from ‘./url’
components : {Child}
<Child url= ’/contact ‘> | props : [‘url’] or props : {url : ‘url’} <a :href= ’url’> |
slot (Parent > Child)Parent / | Child / | import Child from ‘./url’
components : {Child}
<Child v-slot:slotName >anything to replace default content </Child> |
<button> <span>fixed data</span>
<slot name=’slotName’>default free content </slot>{{nl]] </button>
|
Slots are free areas that can be named to use more than one. Default content of slots set in child component can be replaced as needed. $emit (Child > Parent)Parent / | Child / | import Child from ‘./url’
components : {Child}
data() { return{ msg : ‘’ } }
methods : { setMsg(event) { this.msg = event.msg } }
<Child @event-perso = ’setMsg’ /> | methods : { eventPerso(){ this.$emit(‘event-perso’,{msg : ‘hello’}) } }
<button @click = ‘eventPerso’> |
RouterInstall: vue add router // App.vue wil be erased! | route = { path:'/', name: 'Name', component: ImportedName OR () => import('../path/Component') } | <router-view /> - Display point | <router-link to='/path'></router-link> - Link using routes (no reload page) |
LifecyclebeforeCreate()/created() beforeMount()/mounted() beforeDestroy()/destroyed() | Function used in export default {...} to define the moment some operations must be ignitiated. |
Vuex - General dataStoreState (dataStore) | Paths: $store.state
pluggin: { mapState } - use spread operator ... | Pluggin must be used in computed
* objects can be used in place of strings to rename variables | Vuex store/ state: {key: 'value'}
Component/ Import { mapState } from 'vuex'
computed: { ...mapState(['var1','var2']) } * | Getters (computed) | Path: $store.getters
pluggin: { mapGetters } - use spread operator ... | Pluggin must be used in computed | Vuex store/ getters: { setDate(state) { return ${state.day}:${state.month}:${state.year} }
Component/
direct/ computed : { date() {this.$store.getters(‘setDate’)} }
pluggin/ import { mapGetters } from ‘vuex’
computed : {...mapGetters([‘setDate’]) } | Mutations (change State) | Path: - no access from components -
Pluggin: - none - | Isolated from components
CAPITALIZED_NAME
args: state, payload | Vuex store/ state: { count: 0 }
mutations: { INCREASE_COUNT(state, amount) {state.count += Number(amount)} } | Actions (commit changes to State) | Path: $store.dispatch
Pluggin: { mapActions } - use spread operator ... | Pluggin must be used in methods
Apply mutators to State
args: context, payload | Vuex store/ actions: { updateCount(context,amount) {context.commit(‘INCREASE_COUNT’, amount)} }
Component/
direct/ methods: { update() {this.$store.dispatch('updateCount')} }
pluggin/ import { mapActions } from 'vuex'
methods: { ...mapActions(['updateCount']) } |
All data contained in this dataStore is accessible and changeable to any component. |
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