r:page:first_non_blank_attr

<r:page:first_non_blank_attr />

This pulls the first non-blank attribute from the CleanSlate page properties, in the order that you give it. Consider the following example:

<r:page:first_non_blank_attr names="title, name" />

In the example, this would be like saying if the  <r:page:title /> attribute exists, use it. Otherwise, use  <r:page:name />. This depends on what information the user has given CleanSlate.

{{ var | default: "Hello" }}

This pulls the first non-blank attribute from a CleanSlate object, in the order from left to right.

Example

{{ page.title | default: page.name }}

In the example, this says if {{ page.title }} attribute exists, use it. Otherwise, use {{ page.name }}. This depends on what information the user has entered into the CleanSlate Page Properties modal.

You can also chain multiple | default: statements:

{{ page.title | default: page.created_at | default: page.name }}

This checks for a page title, then, if that doesn't exist, checks for when the page was created, then, if that doesn't exist, outputs the page's name.