new Vue({
el: '#app',
data: {
person: {
name: 'Edson'
}
},
methods: {
changeName() {
// because name is declared in data, whenever it
// changes, Vue automatically updates
this.person.name = 'Arantes';
},
changeNickname() {
// because nickname is NOT declared in data, when it
// changes, Vue will NOT automatically update
this.person.nickname = 'Pele';
// although if anything else updates, this change will be seen
},
changeNicknameProperly() {
// when some property is NOT INITIALLY declared in data, the correct way
// to add it is using Vue.set or this.$set
Vue.set(this.person, 'address', '123th avenue.');
// subsequent changes can be done directly now and it will auto update
this.person.address = '345th avenue.';
}
}
})
/* CSS just for the demo, it is not necessary at all! */
span:nth-of-type(1),button:nth-of-type(1) { color: blue; }
span:nth-of-type(2),button:nth-of-type(2) { color: red; }
span:nth-of-type(3),button:nth-of-type(3) { color: green; }
span { font-family: monospace }
<script src="https://unpkg.com/vue"></script>
<div id="app">
<span>person.name: \{\{ person.name }}</span><br>
<span>person.nickname: \{\{ person.nickname }}</span><br>
<span>person.address: \{\{ person.address }}</span><br>
<br>
<button @click="changeName">this.person.name = 'Arantes'; (will auto update because `name` was in `data`)</button><br>
<button @click="changeNickname">this.person.nickname = 'Pele'; (will NOT auto update because `nickname` was not in `data`)</button><br>
<button @click="changeNicknameProperly">Vue.set(this.person, 'address', '99th st.'); (WILL auto update even though `address` was not in `data`)</button>
<br>
<br>
For more info, read the comments in the code. Or check the docs on <b>Reactivity</b> (link below).
</div>
<template>
<Child
:key="[$route.fullPath, value]" // Can assign "Array" to ":key="
@childReload="reload" // Call @click="$emit('childReload')" in
/> // Child Component to increment the value.
</template>
OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR
<template>
<router-view
:key="[$route.fullPath, value]" // Can assign "Array" to ":key="
@routerViewReload="reload" // Call @click="$emit('routerViewReload')"
/> // in Child Component to increment the value.
</template>
<script>
export default {
name: "Parent", components: { Child, },
data() {
return {
value: 0,
};
},
methods: {
reload() {
this.value++;
}
}
}
</script>
<template>
<Child
:key="state ? $route.fullPath : [$route.fullPath, value]"
@childReload="reload" // Call @click="$emit('childReload')" in
/> // Child Component to increment the value.
</template>
OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR OR
<template>
<router-view
:key="state ? $route.fullPath : [$route.fullPath, value]"
@routerViewReload="reload" // Call @click="$emit('routerViewReload')" in
/> // Child Component to increment the value.
</template>
<script>
export default {
name: "Parent", components: { Child, },
data() {
return {
state: true,
value: 0,
};
},
methods: {
reload() {
this.state = false;
this.value++;
this.$nextTick(() => this.state = true);
}
}
}
</script>