org.jaulp.wicket.behaviors.AddJavascriptBehavior.java Source code

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Here is the source code for org.jaulp.wicket.behaviors.AddJavascriptBehavior.java

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/**
 * Copyright (C) 2010 Asterios Raptis
 *
 * 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.jaulp.wicket.behaviors;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.util.lang.Args;

/**
 * The Class AddJavascriptBehavior adds javascript code as String with an id.
 */
public class AddJavascriptBehavior extends Behavior {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /**
     * The unique id for the javascript element. This can be null, however in that case the ajax
     * header contribution can't detect duplicate script fragments.
     */
    private final String id;

    /** The javascript code to be rendered. */
    private final CharSequence javascript;

    /**
     * Instantiates a new adds the javascript behavior.
     * 
     * @param javascript
     *            javascript content to be add.
     * @param id
     *            unique id for the javascript element.
     */
    public AddJavascriptBehavior(CharSequence javascript, String id) {
        super();
        Args.notNull(javascript, "javascript");
        this.javascript = javascript;
        this.id = id;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        response.render(JavaScriptHeaderItem.forScript(this.javascript, this.id));
        super.renderHead(component, response);
    }

}