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[utils] / wicket / components / src / main / java / org / wamblee / wicket / behavior / OnClickConfirmationBehavior.java

diff --git a/wicket/components/src/main/java/org/wamblee/wicket/behavior/OnClickConfirmationBehavior.java b/wicket/components/src/main/java/org/wamblee/wicket/behavior/OnClickConfirmationBehavior.java
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+/*
+ * Copyright 2005-2011 the original author or authors.
+ * 
+ * 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.wamblee.wicket.behavior;
+
+import org.apache.wicket.AttributeModifier;
+import org.apache.wicket.model.IModel;
+import org.apache.wicket.model.Model;
+
+/**
+ * Attribute modifier to add onclick confirmation to buttons. 
+ * 
+ * @author Erik Brakkee
+ */
+public class OnClickConfirmationBehavior extends AttributeModifier {
+
+    private static final String ATTRIBUTE = "onclick";
+
+    /**
+     * Constructs the behavior.
+     * @param aMsg Confirmation message.
+     */
+    public OnClickConfirmationBehavior(String aMsg) {
+        this(new Model(aMsg));
+    }
+    
+    /**
+     * Constructs the behavior.
+     * @param aMsgModel Confirmation message. 
+     */
+    public OnClickConfirmationBehavior(IModel<?> aMsgModel) {
+        super(ATTRIBUTE, true, aMsgModel);
+    }
+
+    @Override
+    protected String newValue(String aCurrentValue, String aReplacementValue) {
+        String value = "var conf = confirm('" + aReplacementValue + "'); " +
+            "if (!conf) return false; ";
+        if (aCurrentValue != null) {
+            return value + aCurrentValue;
+        }
+        return value;
+    }
+
+}