dk.teachus.frontend.components.form.DefaultFocusBehavior.java Source code

Introduction

Here is the source code for dk.teachus.frontend.components.form.DefaultFocusBehavior.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 dk.teachus.frontend.components.form;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.WicketEventReference;
import org.apache.wicket.markup.html.form.FormComponent;

/**
 * 
 */
public class DefaultFocusBehavior extends Behavior {
    private static final long serialVersionUID = 1L;

    private static final String NEWLINE = "\n";

    @Override
    public void bind(Component component) {
        if (component instanceof FormComponent == false) {
            throw new IllegalArgumentException("Can only bind to a formcomponent");
        }

        component.setOutputMarkupId(true);
    }

    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        response.renderJavaScriptReference(WicketEventReference.INSTANCE);

        StringBuilder b = new StringBuilder();

        b.append("Wicket.Event.addDomReadyEvent(function() {").append(NEWLINE);
        b.append("document.getElementById('").append(component.getMarkupId()).append("').focus();").append(NEWLINE);
        b.append("});").append(NEWLINE);

        response.renderJavaScript(b, "Wicket.defaultFormFieldFocus");
    }

}