Package org.wicketstuff.select2

Source Code of org.wicketstuff.select2.Select2MultiChoice

/*
* Copyright 2012 Igor Vaynberg
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with
* the License. You may obtain a copy of the License in the LICENSE file, or 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.wicketstuff.select2;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;

import org.apache.wicket.ajax.json.JSONException;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.string.Strings;
import org.wicketstuff.select2.json.JsonBuilder;

/**
* Multi-select Select2 component. Should be attached to a
* {@code <input type='hidden'/>} element.
*
* @author igor
*
* @param <T>
*            type of choice object
*/
public class Select2MultiChoice<T> extends AbstractSelect2Choice<T, Collection<T>> {
  private static final long serialVersionUID = 1L;

  public Select2MultiChoice(String id, IModel<Collection<T>> model, ChoiceProvider<T> provider) {
    super(id, model, provider);
  }

  public Select2MultiChoice(String id, IModel<Collection<T>> model) {
    super(id, model);
  }

  public Select2MultiChoice(String id) {
    super(id);
  }

  @Override
  public void convertInput() {

    String input = getWebRequest().getRequestParameters().getParameterValue(getInputName()).toString();

    final Collection<T> choices;
    if (Strings.isEmpty(input)) {
      choices = new ArrayList<T>();
    } else {
      choices = getProvider().toChoices(Arrays.asList(input.split(",")));
    }

    setConvertedInput(choices);
  }

  @Override
  public void updateModel() {
    FormComponent.updateCollectionModel(this);
  }

  @Override
  protected void onInitialize() {
    super.onInitialize();
    getSettings().setMultiple(true);
  }

  @Override
  protected String getModelValue() {
    Collection<T> values = getModelObject();

    // if values is null or empty set value attribute to an empty string
    // rather then '[]' which does not make sense
    if (values == null || values.isEmpty()) {
      return "";
    }

    return super.getModelValue();
  }

  @Override
  protected void renderInitializationScript(IHeaderResponse response) {
    Collection<? extends T> choices;
    if (getWebRequest().getRequestParameters().getParameterNames().contains(getInputName())) {
      convertInput();
      choices = getConvertedInput();
    } else {
      choices = getModelObject();
    }

    if (choices != null && !choices.isEmpty()) {

      JsonBuilder selection = new JsonBuilder();

      try {
        selection.array();
        for (T choice : choices) {
          selection.object();
          getProvider().toJson(choice, selection);
          selection.endObject();
        }
        selection.endArray();
      } catch (JSONException e) {
        throw new RuntimeException("Error converting model object to Json", e);
      }

      response.render(OnDomReadyHeaderItem.forScript(JQuery.execute("$('#%s').select2('data', %s);", getJquerySafeMarkupId(),
          selection.toJson())));
    }
  }

}
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