AUR4204

Error Message

AUR4204: Invalid binding target

Description

This error occurs when the & validate binding behavior cannot determine a valid binding target (the element/property it should validate). This typically indicates the binding is not attached to a supported form control target or the binding is in an unexpected state.

Common Scenarios

• Applying & validate to a binding that does not map to a real DOM target property.

• Using & validate on a custom binding setup where the underlying target cannot be resolved.

• A custom element/attribute produces an unexpected binding target shape.

Solution

• Use & validate on standard form control property bindings (for example value.bind, checked.bind).

• Ensure the binding is targeting a real element property and the element exists at bind time.

• If using custom components, ensure they expose a bindable that maps to a real input value/checked state (or validate programmatically via a ValidationController).

Troubleshooting

• Confirm the binding is a property binding on a form control element.

• Inspect the rendered DOM to ensure the element exists and the binding is applied where you expect.

• If the binding is created by a custom attribute/behavior, verify it produces a valid binding target.