Understanding how to utilize the scoped slot prop within a parent computed property

Question

Understanding how to utilize the scoped slot prop within a parent computed property

Currently, I have a closely connected pair of parent-child components utilizing a scoped slot. The child component sends data to the parent through a scoped slot prop (which we'll refer to as myScopedProp). Everything is functioning smoothly in this setup. Within the parent's scoped slot, I am able to pass myScopedProp as an argument to various methods in the parent script and it works perfectly.

Now, my question is: How can I access myScopedProp within a computed function defined in the parent component without having to first set it as data? Is there a Vue.js native way to retrieve myScopedProp from the parent script?

<!-- parent -->
<template>
  <child>
    <template #theSlot="{ myScopedProp}">
      {{ parentMethod(myScopedProp) }} <-- this works fine
    </template>
  </child>
</template>

<!-- child -->
<template>
  <slot name="theSlot" :myScopedProp="someChildValue">
</slot>
</template>

So far, I have been resolving this issue by passing a method from the parent to the child which then sets the value of myScopedProp in the parent's data. However, this approach feels incorrect and redundant considering that the value is already being passed via the scoped slot.

javascript vue.js vuejs3 hierarchy slots

Answer 1

Answer №1

VUE SFC PLAYGROUND

When it comes to achieving this task, there are numerous possibilities to explore. Personally, I prefer utilizing the provide/inject method given how closely intertwined the components are. This approach is often referred to as lifting state. Alternatively, the use of v-model could also be sufficient.

Other alternatives include:

Directly assigning the value, similar to your attempt with a function
An alternative and potentially more idiomatic solution would involve making use of the defineExpose() macro and a component reference:

<script setup>
import { ref, provide, cloneVNode } from 'vue';
import Comp from './Comp.vue';

const slotProp = ref();
const $comp = ref();
const providedProp = ref();
provide('providedProp', providedProp);

</script>

<template>
  <h1>{{ slotProp }}</h1>
  <h1>{{ $comp?.prop }}</h1>
  <h1>{{ providedProp }}</h1>
  <comp ref="$comp" #="{prop}" v-assign="comp => directiveProp = comp.internal">{{ (slotProp = prop, '') }}</comp>
</template>

Comp.vue:

<script setup>
import {ref, inject} from 'vue';
const prop = ref('Slot prop');
const exposed = ref('Exposed prop');
defineExpose({prop: exposed});
const provided = inject('providedProp');
provided.value = 'Provided prop';

const changeProps = () => {
  [prop, exposed, provided].forEach(r => r.value += ' changed')
};
</script>

<template>
  <div>
    <slot v-bind="{prop}"/>
    <div>
      <button @click="changeProps">Change props</button>
    </div>
  </div>
  
</template>

Answer 2

VUE SFC PLAYGROUND

When it comes to achieving this task, there are numerous possibilities to explore. Personally, I prefer utilizing the provide/inject method given how closely intertwined the components are. This approach is often referred to as lifting state. Alternatively, the use of v-model could also be sufficient.

Other alternatives include:

Directly assigning the value, similar to your attempt with a function
An alternative and potentially more idiomatic solution would involve making use of the defineExpose() macro and a component reference:

<script setup>
import { ref, provide, cloneVNode } from 'vue';
import Comp from './Comp.vue';

const slotProp = ref();
const $comp = ref();
const providedProp = ref();
provide('providedProp', providedProp);

</script>

<template>
  <h1>{{ slotProp }}</h1>
  <h1>{{ $comp?.prop }}</h1>
  <h1>{{ providedProp }}</h1>
  <comp ref="$comp" #="{prop}" v-assign="comp => directiveProp = comp.internal">{{ (slotProp = prop, '') }}</comp>
</template>

Comp.vue:

<script setup>
import {ref, inject} from 'vue';
const prop = ref('Slot prop');
const exposed = ref('Exposed prop');
defineExpose({prop: exposed});
const provided = inject('providedProp');
provided.value = 'Provided prop';

const changeProps = () => {
  [prop, exposed, provided].forEach(r => r.value += ' changed')
};
</script>

<template>
  <div>
    <slot v-bind="{prop}"/>
    <div>
      <button @click="changeProps">Change props</button>
    </div>
  </div>
  
</template>

Understanding how to utilize the scoped slot prop within a parent computed property

Answer №1

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