Examples with PersonService com.vaadin.flow.component.combobox.test.service.PersonService used on opensource projects

Example 6 with PersonService

use of com.vaadin.flow.component.combobox.test.service.PersonService in project flow-components by vaadin.

the class ComboBoxView method lazyLoading.

private void lazyLoading() {
    ComboBox<Person> comboBox = new ComboBox<>();
    PersonService service = new PersonService(500);
    /*
         * When provided a callback, the combo box doesn't load all items from
         * backend to server memory right away. It will request only the data
         * that is shown in its current view "window". The data is provided
         * based on string filter, offset and limit.
         *
         * When the user scrolls to the end, combo box will automatically extend
         * and fetch more items until the backend runs out of items.
         */
    comboBox.setItems(query -> service.fetch(query.getFilter().orElse(null), query.getOffset(), query.getLimit()));
    comboBox.setId("fetch-callback");
    addCard("Lazy Loading", "Lazy Loading with Callback", comboBox);
}