| // Copyright 2010-2013 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.tapestry5.corelib.components; |
| |
| import org.apache.tapestry5.BindingConstants; |
| import org.apache.tapestry5.ComponentResources; |
| import org.apache.tapestry5.Field; |
| import org.apache.tapestry5.MarkupWriter; |
| import org.apache.tapestry5.annotations.HeartbeatDeferred; |
| import org.apache.tapestry5.annotations.Parameter; |
| import org.apache.tapestry5.annotations.SupportsInformalParameters; |
| import org.apache.tapestry5.dom.Element; |
| import org.apache.tapestry5.ioc.annotations.Inject; |
| |
| /** |
| * Provides a client-side element to contain validation errors; this renders as a {@code <p class="help-block">}. |
| * Must be enclosed by a |
| * {@link org.apache.tapestry5.corelib.components.Form} component and assumes the field and the Error component |
| * are enclosed by a {@code <div class="form-group">}. |
| * |
| * @tapestrydoc |
| * @since 5.2.0 |
| */ |
| @SupportsInformalParameters |
| public class Error |
| { |
| /** |
| * The for parameter is used to identify the {@link Field} to present errors of. |
| */ |
| @Parameter(name = "for", required = true, allowNull = false, defaultPrefix = BindingConstants.COMPONENT) |
| private Field field; |
| |
| @Inject |
| private ComponentResources resources; |
| |
| boolean beginRender(final MarkupWriter writer) |
| { |
| // Initially invisible; will be shown on client if an error exists. |
| Element element = writer.element("p", "class", "help-block invisible"); |
| |
| resources.renderInformalParameters(writer); |
| |
| updateElement(element); |
| |
| writer.end(); |
| |
| return false; |
| } |
| |
| @HeartbeatDeferred |
| private void updateElement(final Element element) |
| { |
| element.attribute("data-error-block-for", field.getClientId()); |
| } |
| } |