I am currently working on a Vue 3 application and I am in the process of setting up a store for state management. Within this application, I have several important files that play different roles:
- app.vue
- component.vue
- main.js
- store.js
These files contain crucial code snippets, such as:
store.js
import { reactive } from 'vue';
const myStore = reactive({
selectedItem: null
});
export default myStore;
main.js
import { createApp } from 'vue';
import App from './app.vue';
import myStore from './store';
const myApp = createApp(App);
myApp.config.globalProperties.$store = myStore;
myApp.mount('#app');
component.vue
<template>
<div>
<div v-if="item">You have selected an item</div>
<div v-else>Please select an item</div>
<button class="btn btn-primary" @click="generateItem">Generate Item</button>
</div>
</template>
<script>
export default {
props: {
item: Object
},
watch: {
item: function(newValue, oldValue) {
alert('The item was updated.');
}
},
methods: {
generateItem() {
const item = {
id:0,
name: 'Some random name'
};
this.$emit('itemSelected', item);
}
}
}
</script>
app.vue
<template>
<component :item="selectedItem" @item-selected="onItemSelected" />
</template>
<script>
import Component form './component.vue';
export default {
components: {
'component': Component
},
data() {
return {
...this.$store
}
},
methods: {
onItemSelected(item) {
console.log('onItemSelected: ');
console.log(item);
this.$store.selectedItem = item;
}
}
}
</script>
The central concept of this setup is to manage state using a reactive object, which is then passed down to the component as a property. The component can modify the object's value when a user interacts with the "Generate Item" button.
I have noticed that the selectedValue is successfully passed down as a property. I confirmed this by manually assigning a dummy value to selectedValue for testing purposes. Additionally, the onItemSelected event handler functions correctly, indicating that events are being transmitted upwards effectively. However, despite updating the selectedItem within the event handler, the changed value does not propagate back down to the component. What could be causing this issue?