[英]VueJS Watcher is not triggered while watching deep object changes
[英]VueJs watching deep changes in object
我在 VueJS 中有這 3 個組件。 我要解決的問題是:當我點擊vehicle
組件時,它需要被選中( selected = true
)而其他車輛未選中。 我需要為雙向數據綁定做什么? 因為我在VehiclesList.vue
組件中更改了這個selected
的屬性,並且它還需要在Monit.vue
(它是父級)中進行更改,並且“Vehicle.vue”需要觀察這個屬性的更改類。
更新車輛也有問題。 在Monit.vue
,我不會像this.vehicles = response.vehicles
那樣更新完整的對象,但我會逐個進行,並且只更改monit
屬性。
也許更容易為此使用商店。 但我想在組件中做到這一點。
編輯:數據結構
{
"m":[
{
"id":"v19",
"regno":"ATECH DOBLO",
"dt":"2017-10-09 13:19:01",
"lon":17.96442604,
"lat":50.66988373,
"v":0,
"th":0,
"r":0,
"g":28,
"s":"3",
"pow":1
},
{
"id":"v20",
"regno":"ATECH DUCATO_2",
"dt":"2017-10-10 01:00:03",
"lon":17.96442604,
"lat":50.6698494,
"v":0,
"th":0,
"r":0,
"g":20,
"s":"3"
},
]
}
監視器
<template>
<div class="module-container">
<div class="module-container-widgets">
<vehicles-list :vehicles="vehicles"></vehicles-list>
</div>
</div>
</template>
<script>
import VehiclesList from '@/components/modules/monit/VehiclesList.vue';
export default {
name: "Monit",
data (){
return {
vehicles: null
}
},
components: {
VehiclesList
},
methods: {
getMonitData(opt){
let self = this;
if (this.getMonitDataTimer) clearTimeout(this.getMonitDataTimer);
this.axios({
url:'/monit',
})
.then(res => {
let data = res.data;
console.log(data);
if (!data.err){
self.updateVehicles(data.m);
}
self.getMonitDataTimer = setTimeout(()=>{
self.getMonitData();
}, self.getMonitDataDelay);
})
.catch(error => {
})
},
updateVehicles(data){
let self = this;
if (!this.vehicles){
this.vehicles = {};
data.forEach((v,id) => {
self.vehicles[v.id] = {
monit: v,
no: Object.keys(self.vehicles).length + 1
}
});
} else {
data.forEach((v,id) => {
if (self.vehicles[v.id]) {
self.vehicles[v.id].monit = v;
} else {
self.vehicles[v.id] = {
monit: v,
no: Object.keys(self.vehicles).length + 1
}
}
});
}
},
},
mounted: function(){
this.getMonitData();
}
};
</script>
車輛列表.vue
<template>
<div class="vehicles-list" :class="{'vehicles-list--short': isShort}">
<ul>
<vehicle
v-for="v in vehicles"
:key="v.id"
:data="v"
@click.native="select(v)"
></vehicle>
</ul>
</div>
</template>
<script>
import Vehicle from '@/components/modules/monit/VehiclesListItem.vue';
export default {
data: function(){
return {
isShort: true
}
},
props:{
vehicles: {}
},
methods:{
select(vehicle){
let id = vehicle.monit.id;
console.log("Select vehicle: " + id);
_.forEach((v, id) => {
v.selected = false;
});
this.vehicles[id].selected = true;
}
},
components:{
Vehicle
}
}
</script>
車輛.vue
<template>
<li class="vehicle" :id="data.id" :class="classes">
<div class="vehicle-info">
<div class="vehicle-info--regno font-weight-bold"><span class="vehicle-info--no">{{data.no}}.</span> {{ data.monit.regno }}</div>
</div>
<div class="vehicle-stats">
<div v-if="data.monit.v !== 'undefined'" class="vehicle-stat--speed" data-name="speed"><i class="mdi mdi-speedometer"></i>{{ data.monit.v }} km/h</div>
</div>
</li>
</template>
<script>
export default {
props:{
data: Object
},
computed:{
classes (){
return {
'vehicle--selected': this.data.selected
}
}
}
}
</script>
在 VueJS 2.0 中不推薦使用雙向組件數據綁定,以獲得更多事件驅動的模型:https ://v2.vuejs.org/v2/guide/components.html#One-Way-Data-Flow
這意味着,在父組件中所做的更改仍會傳播到子組件(單向)。 您在子組件中所做的更改需要通過自定義事件顯式發送回父組件: https ://v2.vuejs.org/v2/guide/components.html#Custom-Events 或 2.3.0+ 中的sync
關鍵字: https ://v2.vuejs.org/v2/guide/components.html#sync-Modifier
編輯替代(也許更好)方法:
監控.vue:
<template>
<div class="module-container">
<div class="module-container-widgets">
<vehicles-list :vehicles="vehicles" v-on:vehicleSelected="onVehicleSelected"></vehicles-list>
</div>
</div>
</template>
<script>
import VehiclesList from '@/components/modules/monit/VehiclesList.vue';
export default {
name: "Monit",
data (){
return {
vehicles: null
}
},
components: {
VehiclesList
},
methods: {
onVehicleSelected: function (id) {
_.forEach((v, id) => {
v.selected = false;
});
this.vehicles[id].selected = true;
}
...other methods
},
mounted: function(){
this.getMonitData();
}
};
</script>
車輛列表.vue:
methods:{
select(vehicle){
this.$emit('vehicleSelected', vehicle.monit.id)
}
},
原始帖子:對於您的示例,這可能意味着您需要在 select 方法中發出更改,並且您需要在VehicleList.vue
中使用某種可變對象:
export default {
data: function(){
return {
isShort: true,
mutableVehicles: {}
}
},
props:{
vehicles: {}
},
methods:{
select(vehicle){
let id = vehicle.monit.id;
console.log("Select vehicle: " + id);
_.forEach((v, id) => {
v.selected = false;
});
this.mutableVehicles[id].selected = true;
this.$emit('update:vehicles', this.mutableVehicles);
},
vehilcesLoaded () {
// Call this function from the parent once the data was loaded from the api.
// This ensures that we don't overwrite the child data with data from the parent when something changes.
// But still have the up-to-date data from the api
this.mutableVehilces = this.vehicles
}
},
components:{
Vehicle
}
}
監視器
<template>
<div class="module-container">
<div class="module-container-widgets">
<vehicles-list :vehicles.sync="vehicles"></vehicles-list>
</div>
</div>
</template>
<script>
您仍然應該更多地考慮責任。 VehicleList.vue 組件不應該負責加載和管理車輛嗎? 這可能會使思考變得容易一些。
編輯 2:嘗試$set
內部對象,看看這是否有幫助:
self.$set(self.vehicles, v.id, {
monit: v,
no: Object.keys(self.vehicles).length + 1,
selected: false
});
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.