org.brixcms.demo.web.tile.ajax.AjaxDemoPanel.java Source code

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Here is the source code for org.brixcms.demo.web.tile.ajax.AjaxDemoPanel.java

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/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.brixcms.demo.web.tile.ajax;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior;
import org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteTextField;
import org.apache.wicket.markup.html.basic.MultiLineLabel;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.PropertyModel;
import org.apache.wicket.util.string.Strings;

import java.util.*;

public class AjaxDemoPanel extends Panel {

    private StringBuilder values = new StringBuilder();

    public AjaxDemoPanel(String id) {
        super(id);

        Form<Void> form = new Form<>("form");
        add(form);

        final IModel<String> model = new IModel<String>() {
            private String value = null;

            @Override
            public String getObject() {
                return value;
            }

            @Override
            public void setObject(String object) {
                value = object;

                values.append("\n");
                values.append(value);
            }

            @Override
            public void detach() {
            }
        };

        final AutoCompleteTextField<String> field = new AutoCompleteTextField<String>("ac", model) {
            @Override
            protected Iterator<String> getChoices(String input) {
                if (Strings.isEmpty(input)) {
                    List<String> emptyList = Collections.emptyList();
                    return emptyList.iterator();
                }

                List<String> choices = new ArrayList<>(10);

                Locale[] locales = Locale.getAvailableLocales();

                for (final Locale locale : locales) {
                    final String country = locale.getDisplayCountry();

                    if (country.toUpperCase().startsWith(input.toUpperCase())) {
                        choices.add(country);
                        if (choices.size() == 10) {
                            break;
                        }
                    }
                }

                return choices.iterator();
            }
        };
        form.add(field);

        final MultiLineLabel label = new MultiLineLabel("history", new PropertyModel<String>(this, "values"));
        label.setOutputMarkupId(true);
        form.add(label);

        field.add(new AjaxFormSubmitBehavior(form, "change") {
            @Override
            protected void onSubmit(AjaxRequestTarget target) {
                target.add(label);
            }

            @Override
            protected void onError(AjaxRequestTarget target) {
            }
        });
    }
}