| // Copyright 2004 The Apache Software Foundation |
| // |
| // 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.apache.tapestry.form; |
| |
| import org.apache.tapestry.IForm; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| |
| /** |
| * Implements a component that manages an HTML <input type=checkbox> |
| * form element. |
| * |
| * [<a href="../../../../../ComponentReference/Checkbox.html">Component Reference</a>] |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public abstract class Checkbox extends AbstractFormComponent |
| { |
| /** |
| * Renders the form elements, or responds when the form containing the element |
| * is submitted (by checking {@link Form#isRewinding()}. |
| * |
| * <p>In traditional HTML, many checkboxes would have the same name but different values. |
| * Under Tapestry, it makes more sense to have different names and a fixed value. |
| * For a checkbox, we only care about whether the name appears as a request parameter. |
| * |
| **/ |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| IForm form = getForm(cycle); |
| |
| // Used whether rewinding or not. |
| |
| String name = form.getElementId(this); |
| |
| if (form.isRewinding()) |
| { |
| String value = cycle.getRequestContext().getParameter(name); |
| |
| setSelected((value != null)); |
| |
| return; |
| } |
| |
| writer.beginEmpty("input"); |
| writer.attribute("type", "checkbox"); |
| |
| writer.attribute("name", name); |
| |
| if (isDisabled()) |
| writer.attribute("disabled", "disabled"); |
| |
| if (isSelected()) |
| writer.attribute("checked", "checked"); |
| |
| renderInformalParameters(writer, cycle); |
| |
| writer.closeTag(); |
| } |
| |
| public abstract boolean isDisabled(); |
| |
| /** @since 2.2 **/ |
| |
| public abstract boolean isSelected(); |
| |
| /** @since 2.2 **/ |
| |
| public abstract void setSelected(boolean selected); |
| |
| } |