Vue JS Vue JS Slots and Scoped Slots 2 — Questions and Answers
Question 1: What is a scoped slot in Vue JS?
- A slot that exposes child component data for the parent's slot content to consume (Correct answer)
- A slot restricted to a component's scoped CSS block
- A slot that is only accessible within the same single-file component
- A slot that prevents the parent from adding fallback content
Correct answer: A slot that exposes child component data for the parent's slot content to consume
Scoped slots allow the child component to pass data upward to the parent's slot content, giving parents control over rendering using child-owned data.
Question 2: How does a child component pass data to a scoped slot?
- By binding attributes on the <slot> element: <slot :item="item"> (Correct answer)
- By using $emit with the slot name and data payload
- By calling this.$slots.default(data) programmatically
- By defining the data inside the parent's v-slot directive value
Correct answer: By binding attributes on the <slot> element: <slot :item="item">
Slot props are passed by binding attributes directly on the `<slot>` element in the child, e.g., `<slot :item="item" :index="index">`.
Question 3: How does a parent access data from a scoped slot?
- <template v-slot:default="slotProps">{{ slotProps.item }}</template> (Correct answer)
- <template @slot="slotProps">{{ slotProps.item }}</template>
- <slot-data>{{ item }}</slot-data>
- <template :slot-scope="slotProps">{{ slotProps.item }}</template>
Correct answer: <template v-slot:default="slotProps">{{ slotProps.item }}</template>
The parent assigns a variable name to `v-slot:slotName="slotProps"` which receives an object containing all bound slot props from the child.
Question 4: Which deprecated attribute was previously used for scoped slots before Vue 2.6?
- slot-scope (Correct answer)
- v-slot-scope
- slot-data
- v-bind-slot
Correct answer: slot-scope
The `slot-scope` attribute was the pre-2.6 scoped slot syntax, replaced by the unified `v-slot` directive introduced in Vue 2.6.
Question 5: What does `v-slot:default` specifically refer to?
- The unnamed default slot of a component (Correct answer)
- The first slot that was defined in the component template
- A slot that must be explicitly named 'default'
- The slot with the highest rendering priority
Correct answer: The unnamed default slot of a component
`v-slot:default` targets the component's unnamed slot, which is the `<slot>` element without a `name` attribute.
Question 6: Can a single Vue component define multiple named slots?
- Yes, a component can define as many named slots as needed (Correct answer)
- No, each component is limited to exactly one named slot
- Yes, but only up to a maximum of three named slots
- Only when using the Composition API with defineSlots
Correct answer: Yes, a component can define as many named slots as needed
Vue places no limit on the number of named slots a component can define, enabling multiple distinct content injection points within a single component.
Question 7: Where does content go when it is NOT wrapped in a `<template v-slot>` inside a component that has named slots?
- It is placed into the component's default slot (Correct answer)
- It is silently discarded and not rendered
- It causes a template compilation error
- It renders after all named slot content
Correct answer: It is placed into the component's default slot
Unwrapped content not assigned to any named slot is automatically routed to the component's default (unnamed) slot.
Vue JS Vue JS Slots and Scoped Slots 2
What is a scoped slot in Vue JS?