com.vaynberg.wicket.select2.Select2Choice.java Source code

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Here is the source code for com.vaynberg.wicket.select2.Select2Choice.java

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/*
 * 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 java.util.Collections;

import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.string.Strings;
import org.json.JSONException;

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

/**
 * Single-select Select2 component. Should be attached to a {@code <input type='hidden'/>} element.
 * 
 * @author igor
 * 
 * @param <T>
 *            type of choice object
 */
public class Select2Choice<T> extends AbstractSelect2Choice<T, T> {

    public Select2Choice(String id, IModel<T> model, ChoiceProvider<T> provider) {
        super(id, model, provider);
    }

    public Select2Choice(String id, IModel<T> model) {
        super(id, model);
    }

    public Select2Choice(String id) {
        super(id);
    }

    @Override
    protected void convertInput() {

        String input = getWebRequest().getRequestParameters().getParameterValue(getInputName()).toString();
        if (Strings.isEmpty(input)) {
            setConvertedInput(null);
        } else {
            setConvertedInput(getProvider().toChoices(Collections.singleton(input)).iterator().next());
        }
    }

    @Override
    protected void renderInitializationScript(IHeaderResponse response) {

        T state = hasRawInput() ? getConvertedInput() : getModelObject();

        if (state != null) {

            JsonBuilder selection = new JsonBuilder();

            try {
                selection.object();
                getProvider().toJson(state, selection);
                selection.endObject();
            } catch (JSONException e) {
                throw new RuntimeException("Error converting model object to Json", e);
            }
            response.render(OnDomReadyHeaderItem
                    .forScript(JQuery.execute("$('#%s').select2('data', %s);", getMarkupId(), selection.toJson())));
        }
    }

}