Slots for content projection in Astro - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a default slot in an Astro component.

Astro

<slot[1]></slot>

Drag options to blanks, or click blank then click option'

A slot="default"

B name="default"

C name="main"

D default

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect slot names like "main" or "slot" attribute instead of name.

Omitting the name attribute or using invalid syntax.

The default slot in Astro is named "default" and is declared using name="default".

2fill in blank

medium

Complete the code to project content into a named slot called "header".

Astro

<Component><div slot=[1]>Title</div></Component>

Drag options to blanks, or click blank then click option'

A"main"

B"footer"

C"content"

D"header"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a slot attribute value that does not match any slot name.

Forgetting to add quotes around the slot name.

To project content into a named slot, the slot attribute must match the slot's name, here "header".

3fill in blank

hard

Fix the error in the slot usage by completing the blank with the correct syntax for a named slot in Astro.

Astro

<slot[1]></slot>

Drag options to blanks, or click blank then click option'

A name="header"

B name=header

C slot="header"

D header

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting quotes around the slot name.

Using the wrong attribute like slot instead of name.

Named slots require the name attribute with the slot name in quotes, like name="header".

4fill in blank

hard

Fill both blanks to create a component that defines a named slot "footer" and projects content into it.

Astro

<slot[1]></slot>
<Component>
  <div [2]>Footer content</div>
</Component>

Drag options to blanks, or click blank then click option'

A name="footer"

B slot="header"

C slot="footer"

D name="header"

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up slot names between definition and usage.

Using wrong attributes or missing quotes.

The slot in the component must be named with name="footer", and the content must use slot="footer" to project correctly.

5fill in blank

hard

Fill all three blanks to create a component with two named slots "header" and "main", and project content into both slots.

Astro

<slot[1]></slot>
<slot[2]></slot>
<Component>
  <h1 [3]>Welcome</h1>
  <p slot="main">Main content here</p>
</Component>

Drag options to blanks, or click blank then click option'

A name="header"

B slot="header"

C name="main"

D slot="footer"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect slot names or attributes.

Forgetting to match slot names exactly.

The component defines slots with name="header" and name="main". The content uses slot="header" and slot="main" to project content correctly.

Practice

1. What is the main purpose of using slots in Astro components?

easy

A. To define styles for a component

B. To handle component state

C. To insert custom content inside a component from outside

D. To fetch data from an API

Solution

1. Step 1: Understand what slots do

   Slots allow you to place custom content inside a component from outside it, making the component flexible.

2. Step 2: Compare with other options

   Styles, state, and data fetching are unrelated to slots' main purpose.

3. Final Answer:

   To insert custom content inside a component from outside -> Option C

4. Quick Check:

   Slots = insert custom content [OK]

Hint: Slots = placeholders for outside content inside components [OK]

Common Mistakes:

• Thinking slots manage styles or state
• Confusing slots with data fetching
• Believing slots are only for static content

2. Which of the following is the correct syntax to define a named slot called header in an Astro component?

easy

A.

B.

C.

D.

Solution

1. Step 1: Recall Astro slot syntax

   Named slots use the syntax to define where content goes.

2. Step 2: Check other options

   Other syntaxes like , , or are invalid in Astro.

3. Final Answer:

   <slot name="header" /> -> Option D

4. Quick Check:

   Named slot syntax = <slot name="..." /> [OK]

Hint: Named slots use syntax [OK]

Common Mistakes:

• Using custom tags like
• Confusing named slots with other frameworks
• Omitting the name attribute

3. Given this Astro component usage:

<MyComponent>
  <h1 slot="title">Welcome</h1>
  <p>Enjoy your stay</p>
</MyComponent>

And inside MyComponent.astro you have:

<slot name="title" />
<slot />

What will be rendered?

medium

A. WelcomeEnjoy your stay

B. Enjoy your stayWelcome

C. Welcome

D. Enjoy your stay

Solution

1. Step 1: Match named slot content

   The <h1> has slot="title", so it fills <slot name="title" /> in the component.

2. Step 2: Match default slot content

   The <p> has no slot attribute, so it fills the default <slot />.

3. Final Answer:

   <h1>Welcome</h1><p>Enjoy your stay</p> -> Option A

4. Quick Check:

   Named slot + default slot = both contents rendered [OK]

Hint: Named slot content fills named slot; others fill default slot [OK]

Common Mistakes:

• Assuming order swaps between slots
• Ignoring slot attribute on elements
• Thinking default slot only renders named slot content

4. What is wrong with this Astro component usage?

<MyComponent>
  <div slot="footer">Footer content</div>
</MyComponent>

And inside MyComponent.astro you have:

<slot name="header" />
<slot />

medium

A. The slot named "footer" is not defined inside the component

B. Slots cannot be used with <div> elements

C. The default slot is missing a name attribute

D. The component must have only one slot

Solution

1. Step 1: Check slot names in component

   The component defines slots named "header" and default (unnamed), but no "footer" slot.

2. Step 2: Check usage slot names

   The usage tries to fill a "footer" slot which does not exist, so content won't render.

3. Final Answer:

   The slot named "footer" is not defined inside the component -> Option A

4. Quick Check:

   Undefined slot name = no content rendered [OK]

Hint: Slot names must match exactly between usage and component [OK]

Common Mistakes:

• Thinking any slot name works without definition
• Believing slot attribute restricts element types
• Assuming default slot needs a name

5. You want to create a reusable Card component with slots for header, body, and footer. Which Astro component code correctly sets up these named slots?

hard

A.

B.

C.

D.

Solution

1. Step 1: Recall correct slot syntax

   Named slots in Astro use self-closing tags like <slot name="name" /> to define placeholders.

2. Step 2: Evaluate options

   <slot name="header" /> <slot name="body" /> <slot name="footer" /> uses correct self-closing syntax for all three slots. <slot-header /> <slot-body /> <slot-footer /> uses invalid custom tags. <slot name="header"> <slot name="body"> <slot name="footer"> nests slots incorrectly. <slot name="header"></slot> <slot name="body"></slot> <slot name="footer"></slot> uses non-self-closing tags which Astro does not support for slots.

3. Final Answer:

   <slot name="header" /> <slot name="body" /> <slot name="footer" /> -> Option B

4. Quick Check:

   Named slots = self-closing <slot name="..." /> [OK]

Hint: Use self-closing for named slots [OK]

Common Mistakes:

• Using custom tags instead of <slot>
• Nesting slots inside each other
• Using non-self-closing slot tags