AUR0723

Template compilation error: Invalid comma-separated class binding syntax in yyyy. It resulted in no valid class names after parsing.

Error message

Template compilation error: Invalid comma-separated class binding syntax in {{0}}. It resulted in no valid class names after parsing.

Parameters

1. target: The invalid comma-separated string provided as the target for the .class binding command.

Error explanation

This error occurs when using the .class binding command with a comma-separated list of class names as the target, but the list is invalid or results in no actual class names after processing. This typically happens if the string contains only commas or whitespace between commas.

The .class binding command allows specifying multiple static classes along with the dynamic binding, like my-class,another-class.class="expression". The part before .class is split by commas, and each part should be a valid class name.

Common causes

• Providing only commas or whitespace as the target for .class (e.g., , .class="expr").

• Having trailing or leading commas without valid class names in between (e.g., my-class,.class="expr").

How to fix

• Ensure that if you use a comma-separated list for the .class binding target, it contains valid class names separated by commas.

• Remove unnecessary commas or whitespace.

• If you only intend to bind dynamically without static classes, use class.bind="expression" instead of .class="expression".

Example of Incorrect Usage:

<!-- Error: Only a comma before .class -->
<div ,.class="isActive ? 'active' : ''"></div>

<!-- Error: Comma with whitespace before .class -->
<div  ,  .class="isActive ? 'active' : ''"></div>

<!-- Error: Trailing comma -->
<div my-static-class,.class="isActive ? 'active' : ''"></div>

Example of Correct Usage:

<!-- Binding dynamic class only -->
<div class.bind="isActive ? 'active' : ''"></div>

<!-- Binding dynamic class with one static class -->
<div my-static-class.class="isActive ? 'active' : ''"></div>

<!-- Binding dynamic class with multiple static classes -->
<div my-static-class,another-one.class="isActive ? 'active' : ''"></div>