granite/ui/components/coral/foundation/form/checkbox uncheckedValue not working

Hi @prashardan,

1. When checkbox is unchecked, store value as false

By default, unchecked checkboxes don't submit any value — which is why you’re seeing "" (empty string) or nothing in the JCR node.

Try this:

<disable
    jcr:primaryType="nt:unstructured"
    sling:resourceType="granite/ui/components/coral/foundation/form/checkbox"
    fieldDescription="Checking will add a check icon"
    name="./disable"
    text="disable"
    checked="{Boolean}false"
    uncheckedValue="{Boolean}false"
    value="{Boolean}true"
    deleteHint="{Boolean}true"/>

Key changes:

• uncheckedValue: This ensures false is stored when the checkbox is not checked.

• deleteHint=true: Ensures the field gets deleted or replaced with the uncheckedValue during POST.

2. Getting "true" as string, want actual boolean true

When reading the value in your servlet/model or exporting it to JSON via Sling Model, sometimes "true" appears as a string because of how it's stored or serialized.

Fixes:

1. Make sure you're using the correct data type in your Java model.

@ValueMapValue
@Optional
private boolean disable;

This will automatically treat "true" or "false" as a boolean, not a string.

2. If using Sling Model Exporter, ensure the value is exported as a boolean:

@Exporter(name = "jackson", extensions = "json")
public class MyModel implements MyModelInterface {

    @ValueMapValue
    private boolean disable;

    @Override
    public boolean isDisable() {
        return disable;
    }
}

This will ensure your final JSON has:

"disable": true

or

"disable": false

— as actual booleans, not strings.

Hope that helps!
Regards,
Santosh