Can someone please explain the concept of scoped slots in VueJS?

Can someone please help me understand the concept of scoped slots? I checked out the VueJS documentation, but it seems they explain it through examples rather than a direct definition. So, what exactly is a scoped slot? Is it essentially just a regular slot that receives props from the component?

Another question I have is whether "scoped slots" and "named slots" are mutually exclusive. Can a slot be both named and scoped, such as a "named scoped slot"?

Furthermore, when writing code, what does the term "slot" refer to specifically? Does it refer to the literal <slot></slot> tag in the component's template (let's say the component is called navigation-link), like in this example:

<template>
    <a v-bind:href="url">
      <slot></slot> // Is this considered the "slot"?
    </a>
</template>

Or does the term "slot" refer to the actual HTML content we include in the parent component while using the navigation-link, as shown here:

<navigation-link url="/profile">
    <span class="link-text">Your Profile</span>  // Or is this HTML content referred to as a "slot"?
</navigation-link>

Answer №1

  1. When we refer to a "slot," what exactly are we talking about?

<slot></slot> - This is where the component indicates "this is where the parent can insert its own content, including default content." The appropriate term for the parent's counterpart is likely "slot content."

  1. What is a slot?

A slot is a tool that enables some portion of a component's content to be specified or replaced by the parent component...

  1. Regular slot

This slot accepts static content or content that relies solely on the parent's data.

From the perspective of the component, it resembles receiving static HTML (an array of VNodes in Vue)

  1. Scoped slot

A slot that accepts content which may be static, derived from the parent's data or internal data of a component (the component determines which data to provide)

The content transferred from the parent is dynamic rather than static. It is generated as a function during the compilation of the parent's template. When the component containing the slot is rendered, this function will be invoked, accepting certain data (internal to that component) and producing HTML output (again, an array of VNodes in Vue)

While it may seem like a minor distinction, scoped slots prove to be significantly more beneficial than regular slots. For instance, when creating a DataGrid component, only with scoped slots can you define a slot dedicated to rendering each row individually - outlining the structure of every row. This slot content becomes a function that the component can call for every item in the input array (supplying the "current row" item as a slot property) and leverage the outcome as a representation for the specific row.

  1. Is it possible to have a slot that is both named and scoped, such as a "named scoped slot"?

An easy way to understand it is that all slots have names, but in certain scenarios, Vue permits omitting the slot name and assigns it the default name "default"

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