Package com.vaynberg.wicket.select2

Source Code of com.vaynberg.wicket.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 com.vaynberg.wicket.select2;

import com.vaynberg.wicket.select2.json.JsonBuilder;
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.json.JSONException;

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

/**
* 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>> {

  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
    protected void convertInput() {

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

  final Collection<T> choices;
  if (Strings.isEmpty(input)) {
      choices = new ArrayList<T>();
  } else {
    List<String> ids = splitInput( input );
    choices = getProvider().toChoices( ids );
  }

  setConvertedInput(choices);
    }

  static List<String> splitInput( String input ) {

    if( input.startsWith( "{" ) && input.endsWith( "}" )) {
      // Assume we're using JSON IDs
      List<String> result = new ArrayList<String>();

      int openBracket = 0;
      Integer lastStartIdx = null;
      for( int i = 0; i < input.length(); i++ ) {
        char c = input.charAt( i );
        if( c == '{' ) {
          openBracket++;
          if( lastStartIdx == null) {
            lastStartIdx = i;
          }
        }
        if( c == '}' ) {
          openBracket--;
          if( openBracket == 0 ) {
            String substring = input.substring( lastStartIdx, i + 1 );
            result.add( substring );
            lastStartIdx = null;
          }
        }
      }

      return result;
    }

    return Arrays.asList( input.split( "," ) );
  }

  @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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