/*
* 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())));
}
}
}