Source Code Cross Referenced for AjaxFormComponentUpdatingBehavior.java in  » J2EE » wicket » org » apache » wicket » ajax » form » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » wicket » org.apache.wicket.ajax.form 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.wicket.ajax.form;
018:
019:        import org.apache.wicket.WicketRuntimeException;
020:        import org.apache.wicket.ajax.AjaxEventBehavior;
021:        import org.apache.wicket.ajax.AjaxRequestTarget;
022:        import org.apache.wicket.markup.html.form.FormComponent;
023:        import org.apache.wicket.markup.html.form.persistence.IValuePersister;
024:        import org.apache.wicket.markup.html.form.validation.IFormValidator;
025:        import org.apache.wicket.util.string.AppendingStringBuffer;
026:
027:        /**
028:         * A behavior that updates the hosting FormComponent via ajax when an event it
029:         * is attached to is triggered. This behavior encapsulates the entire
030:         * form-processing workflow as relevant only to this component so if validation
031:         * is successfull the component's model will be updated according to the
032:         * submitted value.
033:         * <p>
034:         * NOTE: This behavior does not support persisting form component values into
035:         * cookie or other {@link IValuePersister}. If this is necessary please add a
036:         * request for enhancement.
037:         * <p>
038:         * NOTE: This behavior does not validate any {@link IFormValidator}s attached
039:         * to this form even though they may reference the component being updated.
040:         * 
041:         * @since 1.2
042:         * 
043:         * @author Igor Vaynberg (ivaynberg)
044:         */
045:        public abstract class AjaxFormComponentUpdatingBehavior extends
046:                AjaxEventBehavior {
047:            /**  
048:             * Construct.
049:             * 
050:             * @param event
051:             *            event to trigger this behavior
052:             */
053:            public AjaxFormComponentUpdatingBehavior(final String event) {
054:                super (event);
055:            }
056:
057:            /**
058:             * 
059:             * @see org.apache.wicket.behavior.AbstractAjaxBehavior#onBind()
060:             */
061:            protected void onBind() {
062:                super .onBind();
063:
064:                if (!(getComponent() instanceof  FormComponent)) {
065:                    throw new WicketRuntimeException(
066:                            "Behavior "
067:                                    + getClass().getName()
068:                                    + " can only be added to an instance of a FormComponent");
069:                }
070:            }
071:
072:            /**
073:             * 
074:             * @return FormComponent
075:             */
076:            protected final FormComponent getFormComponent() {
077:                return (FormComponent) getComponent();
078:            }
079:
080:            /**
081:             * @see org.apache.wicket.ajax.AjaxEventBehavior#getEventHandler()
082:             */
083:            protected final CharSequence getEventHandler() {
084:                return generateCallbackScript(new AppendingStringBuffer(
085:                        "wicketAjaxPost('").append(getCallbackUrl(false))
086:                        .append(
087:                                "', wicketSerialize(Wicket.$('"
088:                                        + getComponent().getMarkupId() + "'))"));
089:            }
090:
091:            /**
092:             * @see org.apache.wicket.ajax.AjaxEventBehavior#onCheckEvent(java.lang.String)
093:             */
094:            protected void onCheckEvent(String event) {
095:                if ("href".equalsIgnoreCase(event)) {
096:                    throw new IllegalArgumentException(
097:                            "this behavior cannot be attached to an 'href' event");
098:                }
099:            }
100:
101:            /**
102:             * 
103:             * @see org.apache.wicket.ajax.AjaxEventBehavior#onEvent(org.apache.wicket.ajax.AjaxRequestTarget)
104:             */
105:            protected final void onEvent(final AjaxRequestTarget target) {
106:                final FormComponent formComponent = getFormComponent();
107:
108:                try {
109:                    formComponent.inputChanged();
110:                    formComponent.validate();
111:                    if (formComponent.hasErrorMessage()) {
112:                        formComponent.invalid();
113:
114:                        onError(target, null);
115:                    } else {
116:                        formComponent.valid();
117:                        formComponent.updateModel();
118:                        onUpdate(target);
119:                    }
120:                } catch (RuntimeException e) {
121:                    onError(target, e);
122:
123:                }
124:            }
125:
126:            /**
127:             * Listener invoked on the ajax request. This listener is invoked after the
128:             * component's model has been updated.
129:             * 
130:             * @param target
131:             */
132:            protected abstract void onUpdate(AjaxRequestTarget target);
133:
134:            /**
135:             * Called to handle any error resulting from updating form component. Errors
136:             * thrown from {@link #onUpdate(AjaxRequestTarget)} will not be caught here.
137:             * 
138:             * The RuntimeException will be null if it was just a validation or conversion 
139:             * error of the FormComponent
140:             * 
141:             * @param target
142:             * @param e
143:             */
144:            protected void onError(AjaxRequestTarget target, RuntimeException e) {
145:                if (e != null) {
146:                    throw e;
147:                }
148:            }
149:        }
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