Dynamically Populating Label Parameters
Output and update labels using the format() expression function.
You can provide a string with placeholders, which are replaced by the substitution values at runtime.
Add as many parameters as you need. The parameters are numbered and are zero-based. For example, if you have three parameters, they will be named {0}, {1}, and {2}, and they will be substituted in the order they’re specified.
Let’s look at a custom label, $Label.mySection.myLabel, with a value of Hello {0} and {1}, where $Label is the global value provider that accesses your labels.
This expression dynamically populates the placeholder parameters with the values of the supplied attributes.
1{!format($Label.mySection.myLabel, v.attribute1, v.attribute2)}
The label is automatically refreshed if one of the attribute values changes.
Always use the $Label global value provider to reference a label with placeholder parameters. You can’t set a string with placeholder parameters as the first argument for format(). For example, this syntax doesn’t work:
1{!format('Hello {0}', v.name)}
Use this expression instead.
1{!format($Label.mySection.salutation, v.name)}
where $Label.mySection.salutation is set to Hello {0}.
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