In Karibu Testing I'm allowing the user to filter the components also based on the placeholder. However, there is no unified interface that can return the placeholder for a component, and therefore I had to write the following function:

val Component.placeholder: String?
    get() = when (this) {
        is TextField -> placeholder
        is TextArea -> placeholder
        is PasswordField -> placeholder
        is ComboBox<*> -> this.placeholder
        is DatePicker -> placeholder
        is Input -> placeholder.orElse(null)
        else -> null
    }

The HasPlaceholder doesn't have to be a mixin interface, it could be just an interface with single method, String getPlaceholder(). TextField, TextArea, PasswordField, ComboBox, DatePicker can implement the interface directly; Input needs to modify the return type from Optional to String.

A simple interface would do:

public interface HasPlaceholder {
    /**
     * A hint to the user of what can be entered in the component.
     *
     * @return the {@code placeholder} property from the webcomponent
     */
    public String getPlaceholder();
     /**
     * A hint to the user of what can be entered in the control.
     * @param placeholder
     *            the String value to set
     */
    public void setPlaceholder(String placeholder);
}

Create HasPlaceholder interface #4068

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