[英]How to trigger component events from any other component in the app using vue.js?
我有一個要在網站所有頁面上運行的組件(倒數計時器)。 在頂級App.vue文件中引用了它。 我需要能夠從應用程序內的任何其他組件調用該組件內部的事件(以重新啟動時間),而不管它的層次結構鏈有多深(意味着,我不想在每個事件中都運行事件和$ emits)網站上針對這件事的單個組件)。
每當我對服務器進行ajax調用時,我都想重置計時器。 因此,每次在下面的代碼中單擊按鈕時,我都想觸發倒數計時器組件上的startCountdown(true)
事件。
Main.js
import Vue from "vue";
import App from "./App.vue";
import Vuex from "vuex";
import router from "./router/router";
import VueAwesomeCountdown from "vue-awesome-countdown";
Vue.config.productionTip = false;
Vue.use(Vuex);
Vue.use(VueAwesomeCountdown);
const store = new Vuex.Store({
state: {
count: 0
},
getters: {
count: state => {
return state.count;
}
},
mutations: {
increment: state => state.count++,
decrement: state => state.count--
},
actions: {
increment: context => {
context.commit("increment");
},
decrement: context => {
context.commit("decrement");
}
}
});
new Vue({
el: "#app",
router,
store,
template: "<App />",
components: {
App
}
});
App.vue
<template>
<div id="app">
<router-link to="/" class="btn bt-link">Page 1</router-link> |
<router-link to="/Page2" class="btn bt-link">Page 2</router-link> |
<router-link to="/Page3" class="btn bt-link">Page 3</router-link>
<hr>
<br>
<br>
<router-view></router-view>
<br>
<br>
<hr>
<!-- Timer countdown -->
<countdown ref="sessionTimer" :left-time="99000">
<span slot="process" slot-scope="{ timeObj }">Session Timer Countdown: {{ timeObj.ceil.s }}</span>
<span slot="finish">TIMED OUT!</span>
</countdown>
<button class="ml-3 btn btn-warning" @click="restart">Manual Restart</button>
<hr>
<!-- The below is just show vuex is wired up correctly -->
<p>This is just to show that Vuex is working properly.</p>
<p>{{ count }}</p>
<p>
<button @click="increment">+</button>
<button @click="decrement">-</button>
</p>
</div>
</template>
<script>
export default {
name: "App",
computed: {
count() {
return this.$store.getters.count;
}
},
methods: {
restart() {
this.$refs.sessionTimer.startCountdown(true);
},
increment() {
this.$store.dispatch("increment");
},
decrement() {
this.$store.dispatch("decrement");
}
},
components: {}
};
</script>
<style>
#app {
font-family: "Avenir", Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
margin-top: 20px;
}
</style>
Page2.vue
<template>
<div>
<h1>Page 2</h1>
<br>
<br>
<button class="btn btn-success" @click="interactWithServer">Interact with Server 2</button>
<br>
<br>
<SubComponent></SubComponent>
</div>
</template>
<script>
import SubComponent from "./Page2-SubComponent.vue";
export default {
methods: {
interactWithServer() {
//This function will interact with server but I need to start countdown timer over again first
//axios call goes here after timer is reset
}
},
components: {
SubComponent
}
};
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style>
</style>
頁面SubComponent.vue
<template>
<div>
<h3>SUB COMPONENT</h3>
<br>
<br>
<button class="btn btn-primary" @click="interactWithServer">Interact with Server 2.1</button>
</div>
</template>
<script>
export default {
methods: {
interactWithServer() {
//This function will interact with server but I need to start countdown timer over again first
//axios call goes here after timer is reset
}
}
};
</script>
如果有一個較短的方式,但你可以在商店觸發變量,然后聽從不確定App.vue
文件,然后執行restart
打開..這里是一個codesandbox樣本
// store
state: {
changed: false
}
getters: {
changed: (state) => state.changed
}
mutation: {
changed: (state) => state.changed = !state.changed
}
// App.vue
computed: {
trigger() {
return this.$store.getters.changed
}
},
methods: {
restart() {
this.$refs.sessionTimer.startCountdown(true);
}
},
watch: {
trigger() {
this.restart()
}
}
在其他組件上:
interactWithServer() {
this.$store.commit("changed");
}
將計時器的編號保存在商店的:left-time =“ 99000”中,當您在interactWithServer()中觸發事件時將其重置會更好嗎?
Main.js (其他代碼)
state:{
timer: 99000
},
getters: {
getTimer: state => {
return state.timer;
}
},
mutations: {
resetTimer: state => state.timer = 99000
},
actions: {
restartTimer: context => {
context.commit("resetTimer");
}
}
App.vue (修改后的代碼)
</template>
<countdown ref="sessionTimer" :left-time="timer">
<span slot="process" slot-scope="{ timeObj }">Session Timer Countdown: {{ timeObj.ceil.s }}</span>
<span slot="finish">TIMED OUT!</span>
</countdown>
</template>
<script>
computed: {
timer() {
return this.$store.getters.timer;
}
},
</script>
然后在interactWithServer()中調用this。$ store.dispatch(“ restartTimer”);
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