Block development basics in Wordpress - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a block in WordPress block development?

A block is a reusable piece of content or functionality that users can add, edit, and arrange in the WordPress editor to build posts and pages visually.

beginner

Which file typically contains the block's JavaScript code in a WordPress block plugin?

The block's JavaScript code is usually in a file named block.js or index.js, which registers the block and defines its behavior.

beginner

What function is used to register a new block in WordPress?

The registerBlockType() function is used to register a new block, defining its name, title, icon, category, and edit/save behavior.

beginner

What are the two main parts of a block's code in WordPress?

The two main parts are the edit function, which controls how the block looks and behaves in the editor, and the save function, which defines the HTML saved in the post content.

beginner

Why is it important to use semantic HTML in block development?

Using semantic HTML helps with accessibility, SEO, and ensures the content is meaningful and easy to understand for all users and devices.

Which function registers a new block in WordPress?

A initBlock()

B createBlock()

C addBlock()

D registerBlockType()

The correct function to register a block is registerBlockType().

What does the edit function in a block do?

A Defines how the block looks on the live site

B Registers the block's name and icon

C Controls the block's appearance and behavior in the editor

D Saves the block's data to the database

The edit function controls how the block looks and behaves inside the editor.

Where is the block's saved HTML output defined?

A In the save function

B In the PHP render callback

C In the block.json file

D In the edit function

The save function defines the HTML saved in the post content.

Which file usually contains the block's JavaScript code?

A block.js or index.js

B functions.php

C style.css

D template.php

The block's JavaScript code is typically in block.js or index.js.

Why should you use semantic HTML in blocks?

A To make the block load faster

B To improve accessibility and SEO

C To reduce file size

D To make the block editable

Semantic HTML improves accessibility and SEO by making content meaningful.

Explain the roles of the edit and save functions in WordPress block development.

Think about how the block looks while editing versus what is saved.

Describe the steps to register a new block in WordPress using JavaScript.

Focus on the function and key properties needed.

Practice

1. What is the main purpose of creating blocks in WordPress block development?

easy

A. To create reusable content pieces that users can add visually

B. To write PHP code for custom themes

C. To manage user roles and permissions

D. To optimize database queries

Solution

1. Step 1: Understand the role of blocks in WordPress

   Blocks are designed to let users add content pieces easily without coding each time.

2. Step 2: Identify the main benefit of blocks

   Blocks are reusable and visually manageable content units improving editing experience.

3. Final Answer:

   To create reusable content pieces that users can add visually -> Option A

4. Quick Check:

   Blocks = reusable visual content [OK]

Hint: Blocks are for reusable visual content pieces [OK]

Common Mistakes:

• Confusing blocks with PHP theme coding
• Thinking blocks manage users or database
• Assuming blocks are only for styling

2. Which function is used to register a new block type in WordPress block development?

easy

A. createBlockType()

B. initBlock()

C. addBlock()

D. registerBlockType()

Solution

1. Step 1: Recall the standard WordPress block registration function

   The official function to register blocks is registerBlockType.

2. Step 2: Verify other options are incorrect

   Functions like createBlockType, addBlock, and initBlock do not exist in WordPress block API.

3. Final Answer:

   registerBlockType() -> Option D

4. Quick Check:

   Register blocks = registerBlockType() [OK]

Hint: Remember: registerBlockType() registers blocks [OK]

Common Mistakes:

• Using createBlockType() which is not a WordPress function
• Confusing with addBlock() or initBlock() which don't exist
• Misspelling the function name

3. Given this block registration code snippet, what will the block display in the editor?

registerBlockType('myplugin/example', {
  edit: () => {
    return 
Hello, WordPress!
;
  },
  save: () => {
    return 
Hello, WordPress!
;
  }
});

medium

A. A paragraph with text 'Hello, WordPress!' in both editor and saved content

B. An empty block with no content

C. A syntax error preventing block registration

D. A block showing 'edit' text only

Solution

1. Step 1: Analyze the edit function output

   The edit function returns a paragraph with 'Hello, WordPress!' which shows in the editor.

2. Step 2: Analyze the save function output

   The save function returns the same paragraph, so saved content also shows 'Hello, WordPress!'.

3. Final Answer:

   A paragraph with text 'Hello, WordPress!' in both editor and saved content -> Option A

4. Quick Check:

   Edit and save return same paragraph = A paragraph with text 'Hello, WordPress!' in both editor and saved content [OK]

Hint: Edit and save return same JSX content means same display [OK]

Common Mistakes:

• Thinking edit content differs from saved content
• Assuming syntax error due to JSX
• Confusing block output with empty or error

4. Identify the error in this block registration code:

registerBlockType('myplugin/test', {
  edit: () => {
    return 
Test Block
;
  },
  save: () => {
    return div>Test Block;
  }
});

medium

A. edit function missing return statement

B. Missing opening < in save function JSX

C. registerBlockType function name is incorrect

D. Block name 'myplugin/test' is invalid

Solution

1. Step 1: Check the save function JSX syntax

   The save function returns div>Test Block; which is missing the opening < for the div tag.

2. Step 2: Verify other parts are correct

   The edit function correctly returns JSX with <div>, the function name is correct, and block name format is valid.

3. Final Answer:

   Missing opening < in save function JSX -> Option B

4. Quick Check:

   JSX tags must start with < [OK]

Hint: Check JSX tags start with < and end with > [OK]

Common Mistakes:

• Ignoring missing < in JSX tags
• Thinking function names or block names are wrong
• Overlooking return statements

5. You want to create a block that shows a dynamic greeting with a user name passed as an attribute. Which approach correctly uses attributes in block development?

hard

A. Hardcode the user name inside the save function JSX

B. Use a global variable for the name inside edit and save functions

C. Define attributes in registerBlockType and use props.attributes.name in edit and save

D. Only define attributes in edit function, ignore save function

Solution

1. Step 1: Understand attribute usage in blocks

   Attributes must be declared in registerBlockType and accessed via props.attributes in both edit and save functions.

2. Step 2: Evaluate other options

   Using global variables or hardcoding breaks reusability and dynamic behavior; ignoring attributes in save causes data loss.

3. Final Answer:

   Define attributes in registerBlockType and use props.attributes.name in edit and save -> Option C

4. Quick Check:

   Attributes declared and used properly = Define attributes in registerBlockType and use props.attributes.name in edit and save [OK]

Hint: Declare and use attributes via props in edit and save [OK]

Common Mistakes:

• Using global variables instead of attributes
• Hardcoding values losing flexibility
• Not using attributes in save function