What is the [data] Attribute in Blogger?
In Blogger templates, the <b:include> tag allows one part of your template to include another. The [data] attribute is used to send specific information (called an alias) from a parent widget or template section to a child section or <b:includable>.
In simple words, it tells the child section what data it should display.
<b:include data='post' name='foo'/>
The Basic Syntax
The [data] attribute supports different ways to forward data, depending on your needs.
1. Sending a Single Alias
data='alias'
2. Passing Data as an Object
data='{ alias: EXPRESSION }'
3. Sending a List of Strings
data='{ alias: ["STRING1", "STRING2"] }'
Examples of Using [data] Attribute
Example 1: Forwarding Post Data
<b:include data='post' name='foo'/>
Example 2: Sending Custom Data to a Child
<b:include data='{ post: data:foo }' name='bar'/>
Example 3: Passing a Single String Value
<b:include data='{ foo: "bar" }' name='item'/>
Example 4: Sending Multiple String Values
<b:include data='{ foo: ["Qux","Quux"] }' name='list'/>
Why is the [data] Attribute Important?
- Controls Data Flow: It lets you decide exactly what information each section receives.
- Improves Widget Communication: Widgets and includables can exchange specific data smoothly.
- Prevents Data Conflicts: Using aliases ensures there is no clash between similar variable names.
- Helps in Custom Widget Creation: Many advanced Blogger templates rely on this attribute for custom widgets and dynamic layouts.
Best Practices Before Editing
- Always create a backup of your Blogger template before editing.
- Use clear and unique alias names to avoid confusion.
- Test changes on a private or test blog before applying them live.
Final Thoughts
The Blogger [data] attribute is essential for anyone customizing their theme at an advanced level. By using it correctly, you can pass information between different parts of your template, build reusable components, and avoid errors caused by undefined variables.
If you're experimenting with template customization, start small and gradually explore more complex structures. Understanding this attribute is a key step toward mastering Blogger theme development.