Article summary

Summary

Discusses how to populate an Adobe Experience Manager 6.2 drop-down field by using a DataSource Object. In addition, also shows you how to retrieve the value of a drop-down field by using Java that extends WCMUsePojo and displays the result in an AEM web page. 

A special thank you to Ranta and Prince Shivhare, top AEM community members, for testing this article to ensure it works.

Digital Marketing Solution(s) Adobe Experience Manager 6.2
Audience Developer
Required Skills Java, HTML, JQuery
Version 6.2

Download

Note:

You can download an AEM package that contains code and the OSGi bundle that are used in this article. Download the package and deploy using package manager. The purpose of this code is to show the community these concepts in action. That is, it's to illustrate how to use a DataSource object to populate a drop-down field that is located in a Touch UI component. This community code is for teaching purposes only and not meant to go into production as is.

You can view the application by using the following URL: http://localhost:4502/editor.html/content/myHTL62/en.html (assuming you deploy on author).

Introduction

You can create an Adobe Experience Manager (AEM) 6.2 Touch UI component that contains a drop-down control that can be used within the AEM Touch UI view. An AEM author selects drop-down values during design time. For example, an author can select a USA state value from an AEM component that displays address information. A drop-down control is populated by using a com.adobe.granite.ui.components.ds.DataSource object. For information, see DataSource.

Once you create a DataSource object, its data can be used to dynamically populate a drop-down control, as shown in this illustration.

A drop-down control populated by using a DataSouce object

This development article steps you through how to build an AEM 6.2 HTL component by using an AEM Maven Archetype 10 project. Then it discusses how to populate a drop-down field in the component's dialog using a DataSource object.

Setup Maven in your development environment

You can use Maven to build an OSGi bundle that contains a Sling Servlet. Maven manages required JAR files that a Java project needs in its class path. Instead of searching the Internet trying to find and download third-party JAR files to include in your project’s class path, Maven manages these dependencies for you.

You can download Maven 3 from the following URL:

http://maven.apache.org/download.html

After you download and extract Maven, create an environment variable named M3_HOME. Assign the Maven install location to this environment variable. For example:

C:\Programs\Apache\apache-maven-3.0.4

Set up a system environment variable to reference Maven. To test whether you properly setup Maven, enter the following Maven command into a command prompt:

%M3_HOME%\bin\mvn -version

This command provides Maven and Java install details and resembles the following message:

Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

Note:

It is recommended that you use Maven 3.0.3 or greater. For more information about setting up Maven and the Home variable, see: Maven in 5 Minutes.

Next, copy the Maven configuration file named settings.xml from [install location]\apache-maven-3.0.4\conf\ to your user profile. For example, C:\Users\scottm\.m2\.

You have to configure your settings.xml file to use Adobe’s public repository. For information, see Adobe Public Maven Repository at http://repo.adobe.com/.

The following XML code represents a settings.xml file that you can use.

<?xml version="1.0" encoding="UTF-8"?>
  
<!--
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.
-->
  
<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single user, 
 |                 and is normally provided in ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Global Level. This settings.xml file provides configuration for all Maven
 |                 users on a machine (assuming they're all using the same Maven
 |                 installation). It's normally provided in 
 |                 ${maven.home}/conf/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -gs /path/to/global/settings.xml
 |
 | The sections in this sample file are intended to give you a running start at
 | getting the most out of your Maven installation. Where appropriate, the default
 | values (values used when the setting is not specified) are provided.
 |
 |-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->
  
  <!-- interactiveMode
   | This will determine whether maven prompts you when it needs input. If set to false,
   | maven will use a sensible default value, perhaps based on some other setting, for
   | the parameter in question.
   |
   | Default: true
  <interactiveMode>true</interactiveMode>
  -->
  
  <!-- offline
   | Determines whether maven should attempt to connect to the network when executing a build.
   | This will have an effect on artifact downloads, artifact deployment, and others.
   |
   | Default: false
  <offline>false</offline>
  -->
  
  <!-- pluginGroups
   | This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.
   | when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->
  </pluginGroups>
  
  <!-- proxies
   | This is a list of proxies which can be used on this machine to connect to the network.
   | Unless otherwise specified (by system property or command-line switch), the first proxy
   | specification in this list marked as active will be used.
   |-->
  <proxies>
    <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
    -->
  </proxies>
  
  <!-- servers
   | This is a list of authentication profiles, keyed by the server-id used within the system.
   | Authentication profiles can be used whenever maven must make a connection to a remote server.
   |-->
  <servers>
    <!-- server
     | Specifies the authentication information to use when connecting to a particular server, identified by
     | a unique name within the system (referred to by the 'id' attribute below).
     | 
     | NOTE: You should either specify username/password OR privateKey/passphrase, since these pairings are 
     |       used together.
     |
    <server>
      <id>deploymentRepo</id>
      <username>repouser</username>
      <password>repopwd</password>
    </server>
    -->
      
    <!-- Another sample, using keys to authenticate.
    <server>
      <id>siteServer</id>
      <privateKey>/path/to/private/key</privateKey>
      <passphrase>optional; leave empty if not used.</passphrase>
    </server>
    -->
  </servers>
  
  <!-- mirrors
   | This is a list of mirrors to be used in downloading artifacts from remote repositories.
   | 
   | It works like this: a POM may declare a repository to use in resolving certain artifacts.
   | However, this repository may have problems with heavy traffic at times, so people have mirrored
   | it to several places.
   |
   | That repository definition will have a unique id, so we can create a mirror reference for that
   | repository, to be used as an alternate download site. The mirror site will be the preferred 
   | server for that repository.
   |-->
  <mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository. The repository that
     | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used
     | for inheritance and direct lookup purposes, and must be unique across the set of mirrors.
     |
    <mirror>
      <id>mirrorId</id>
      <mirrorOf>repositoryId</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://my.repository.com/repo/path</url>
    </mirror>
     -->
  </mirrors>
    
  <!-- profiles
   | This is a list of profiles which can be activated in a variety of ways, and which can modify
   | the build process. Profiles provided in the settings.xml are intended to provide local machine-
   | specific paths and repository locations which allow the build to work in the local environment.
   |
   | For example, if you have an integration testing plugin - like cactus - that needs to know where
   | your Tomcat instance is installed, you can provide a variable here such that the variable is 
   | dereferenced during the build process to configure the cactus plugin.
   |
   | As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles
   | section of this document (settings.xml) - will be discussed later. Another way essentially
   | relies on the detection of a system property, either matching a particular value for the property,
   | or merely testing its existence. Profiles can also be activated by JDK version prefix, where a 
   | value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.
   | Finally, the list of active profiles can be specified directly from the command line.
   |
   | NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact
   |       repositories, plugin repositories, and free-form properties to be used as configuration
   |       variables for plugins in the POM.
   |
   |-->
  <profiles>
    <!-- profile
     | Specifies a set of introductions to the build process, to be activated using one or more of the
     | mechanisms described above. For inheritance purposes, and to activate profiles via <activatedProfiles/>
     | or the command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a consistent naming convention
     | for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.
     | This will make it more intuitive to understand what the set of introduced profiles is attempting
     | to accomplish, particularly when you only have a list of profile id's for debug.
     |
     | This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.
    <profile>
      <id>jdk-1.4</id>
  
      <activation>
        <jdk>1.4</jdk>
      </activation>
  
      <repositories>
        <repository>
          <id>jdk14</id>
          <name>Repository for JDK 1.4 builds</name>
          <url>http://www.myhost.com/maven/jdk14</url>
          <layout>default</layout>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>
      </repositories>
    </profile>
    -->
  
    <!--
     | Here is another profile, activated by the system property 'target-env' with a value of 'dev',
     | which provides a specific path to the Tomcat instance. To use this, your plugin configuration
     | might hypothetically look like:
     |
     | ...
     | <plugin>
     |   <groupId>org.myco.myplugins</groupId>
     |   <artifactId>myplugin</artifactId>
     |   
     |   <configuration>
     |     <tomcatLocation>${tomcatPath}</tomcatLocation>
     |   </configuration>
     | </plugin>
     | ...
     |
     | NOTE: If you just wanted to inject this configuration whenever someone set 'target-env' to
     |       anything, you could just leave off the <value/> inside the activation-property.
     |
    <profile>
      <id>env-dev</id>
  
      <activation>
        <property>
          <name>target-env</name>
          <value>dev</value>
        </property>
      </activation>
  
      <properties>
        <tomcatPath>/path/to/tomcat/instance</tomcatPath>
      </properties>
    </profile>
    -->
    
  
<profile>
  
                <id>adobe-public</id>
  
                <activation>
  
                    <activeByDefault>true</activeByDefault>
  
                </activation>
  
                <repositories>
  
                  <repository>
  
                    <id>adobe</id>
  
                    <name>Nexus Proxy Repository</name>
  
                    <url>http://repo.adobe.com/nexus/content/groups/public/</url>
  
                    <layout>default</layout>
  
                  </repository>
  
                </repositories>
  
                <pluginRepositories>
  
                  <pluginRepository>
  
                    <id>adobe</id>
  
                    <name>Nexus Proxy Repository</name>
  
                    <url>http://repo.adobe.com/nexus/content/groups/public/</url>
  
                    <layout>default</layout>
  
                  </pluginRepository>
  
                </pluginRepositories>
  
            </profile>
  
</profiles>
  
  <!-- activeProfiles
   | List of profiles that are active for all builds.
   |
  <activeProfiles>
    <activeProfile>alwaysActiveProfile</activeProfile>
    <activeProfile>anotherAlwaysActiveProfile</activeProfile>
  </activeProfiles>
  -->
</settings>

Note:

The Adobe repository URL is now made secured. Change http://repo.adobe.com/nexus/content/groups/public/ to https://repo.adobe.com/nexus/content/groups/public/.

Create an AEM Maven 10 archetype project

You can create an archetype project by using the Maven archetype plugin. In this example, assume that the working directory is C:\AdobeCQ.

Maven Archetype 10 generated files

To create an Experience Manager archetype project, perform these steps:

1. Open the command prompt and go to your working directory (for example, C:\AdobeCQ).

2. Run the following Maven command:

mvn archetype:generate -DarchetypeGroupId=com.adobe.granite.archetypes -DarchetypeArtifactId=aem-project-archetype -DarchetypeVersion=10 -DarchetypeRepository=https://repo.adobe.com/nexus/content/groups/public/

3. When prompted, specify the following information:

  • groupId - myHTL62
  • artifactId - myHTL62
  • version - 1.0-SNAPSHOT
  • package - com.foo.service
  • appsFolderName - myHTL62
  • artifactName - myHTL62
  • componentGroupName - myHTL62
  • contentFolderName - myHTL62
  • cssId - myHTL62
  • packageGroup -myHTL62
  • siteName - myHTL62

4. WHen prompted, specify Y.

5. Once done, you will see a message like:

[INFO] BUILD SUCCESS
[INFO] ----------------------------------------------------------------------
[INFO] Total time: 01:42 min
[INFO] Finished at: 2016-04-25T14:34:19-04:00
[INFO] Final Memory: 16M/463M
[INFO] ----------------------------------------------------------------------

6. Change the working directory to myHTL62 and then enter the following command.

mvn eclipse:eclipse

After you run this command, you can import the project into Eclipse as discussed in the next section.

Add Java files to the Maven project using Eclipse

To make it easier to work with the Maven generated project, import it into the Eclipse development environment, as shown in the following illustration.

An Eclipse project

The Eclipse project that you work in to build the OSGi bundle that uses HTL API is myHTL62.core. You do not have to work in the other projects under myHTL62.

Note:

Do not worry about the errors reported in Eclipse. It does not read the POM file where the APIs are resolved. You build the bundle with Maven. Eclipse is used to edit the Java files and the POM file.

The next step is to add Java files to the com.foo.service.core package. The Java classes are named HeroTextComponent and HeroTextBean. The HeroTextBean is a Java bean that has class members to match the fields specified in the component's dialog.

In this example, it has these string class members:

  • headingText
  • description
  • drop

The headingText class member handles the value that is entered into the headingText field specified in the component's dialog. Likewise, the description class member handles the description field. Finally, the drop member stores the value that the author selected from the drop-down control. 

The HeroTextComponent class is the Java side of the HTL component and extends WCMUsePojo, which is an abstract class that implements the Use interface. A HTL component's Java class must implement this abstract class. For information, see WCMUsePojo.

HeroTextBean class

The HeroTextBean defines two class members and contains getter and setter methods. The following Java code represents this class.

package com.foo.service.core;

/**
 * The Class HeroTextBean.
 */
public class HeroTextBean {
       
    /** The heading text. */
    private String headingText;
       
    /** The description. */
    private String description;
    
    
    //Stores the value of the dropdown
    private String drop; 
    
    public String getDrop() {
        return drop;
    }
    /**
     * 
     */
    public void setDrop(String drop) {
        this.drop = drop;
    }
    
    
    /**
     * @return the headingText
     */
      
    
    public String getHeadingText() {
        return headingText;
    }
    /**
     * @param headingText the headingText to set
     */
    public void setHeadingText(String headingText) {
        this.headingText = headingText;
    }
    /**
     * @return the description
     */
    public String getDescription() {
        return description;
    }
    /**
     * @param description the description to set
     */
    public void setDescription(String description) {
        this.description = description;
    }
   
}

HeroTextComponent class

The HeroTextComponent is the Java server-side part of the AEM HTL component. This class extends the WCMUsePojo class. You override the activate method in this class. The following Java code represents the activate method.

public void activate() throws Exception {
 
 
Node currentNode = getResource().adaptTo(Node.class);
 
heroTextBean = new HeroTextBean();
 
if(currentNode.hasProperty("jcr:Heading")){
heroTextBean.setHeadingText(currentNode.getProperty("./jcr:Heading").getString());
}
if(currentNode.hasProperty("jcr:description")){
heroTextBean.setDescription(currentNode.getProperty("./jcr:description").getString());
}
 
}

A Node instance is created by calling the getReource().adaptTo() method. This returns the node that corresponds to component's dialog. Notice that the following methods:

currentNode.getProperty("./jcr:Heading") ;

currentNode.getProperty("./jcr:description");

This code retrieves the values that the user enters into the component's dialog. The values ./jcr:Heading and ./jcr:description corresponds to the property values that you set when defining the component's dialog. (These values are defined in the classic and touch-ui dialogs.)

The following Java code represents the HeroTextComponent Java class.

package com.foo.service.core;

import com.adobe.cq.sightly.WCMUsePojo;
import com.day.cq.search.PredicateGroup;
import com.day.cq.search.Query;
import com.day.cq.search.QueryBuilder;
import com.day.cq.search.result.SearchResult;
import com.day.cq.tagging.Tag;
import com.day.cq.tagging.TagManager;
   
import com.foo.service.core.HeroTextBean;
  
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
   
  
  
import javax.jcr.Node;
import javax.jcr.Session;
   
  
  
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ValueMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
  
  
  
public class HeroTextComponent
extends WCMUsePojo
{
  
     /** The hero text bean. */
    private HeroTextBean heroTextBean = null;
    
    /** Default log. */
    protected final Logger log = LoggerFactory.getLogger(this.getClass());
       
    @Override
    public void activate() throws Exception {
           
           
           
        Node currentNode = getResource().adaptTo(Node.class);
          
        heroTextBean = new HeroTextBean();
           
        if(currentNode.hasProperty("jcr:Heading")){
            heroTextBean.setHeadingText(currentNode.getProperty("./jcr:Heading").getString());
        }
        if(currentNode.hasProperty("jcr:description")){
            heroTextBean.setDescription(currentNode.getProperty("./jcr:description").getString());
        }
        if(currentNode.hasProperty("./jcr:drop")){
        	
            String myDrop = currentNode.getProperty("./jcr:drop").getString();
            heroTextBean.setDrop(myDrop); 
          }
                   
    }
       
       
       
    public HeroTextBean getHeroTextBean() {
        return this.heroTextBean;
    }
}

Modify the Maven POM file

Add the following POM dependencies to the POM file located at C:\AdobeCQ\myHTL62.

<dependency>
               <groupId>com.adobe.aem</groupId>
               <artifactId>uber-jar</artifactId>
               <version>6.2.0</version>
               <!-- for AEM6.1 use this version     : <version>6.1.0</version> -->
               <!-- for AEM6.1 SP1 use this version : <version>6.1.0-SP1-B0001</version> -->
               <!-- for AEM6.1 SP2 use this version : <version>6.1.0-SP2</version> -->
               <!-- for AEM6.2 use this version     : <version>6.2.0</version> -->
               <classifier>obfuscated-apis</classifier>
               <scope>provided</scope>
           </dependency>
            
           <dependency>
               <groupId>org.apache.geronimo.specs</groupId>
               <artifactId>geronimo-atinject_1.0_spec</artifactId>
               <version>1.0</version>
               <scope>provided</scope>
           </dependency>

You need to modify two POM files. The first one is the parent POM file shown in this illustration.

Parent POM

Add the dependency shown above to the Parent POM file. Next, modify the POM file located at C:\AdobeCQ\myHTL62\core. The following code represents this POM file.

<?xml version="1.0" encoding="UTF-8"?>
<!--
 |  Copyright 2015 Adobe Systems Incorporated
 |
 |  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.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>myHTL62</groupId>
        <artifactId>myHTL62</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <artifactId>myHTL62.core</artifactId>
    <packaging>bundle</packaging>
    <name>myHTL62 - Core</name>
    <description>Core bundle for myHTL62</description>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-scr-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-bundle-plugin</artifactId>
                <extensions>true</extensions>
                <configuration>
                    <instructions>
                        <!--
                        <Embed-Dependency>
                            artifactId1,
                            artifactId2;inline=true
                        </Embed-Dependency>
                        -->
                        <Sling-Model-Packages>
                            com.foo.service.core
                        </Sling-Model-Packages>
                    </instructions>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <profiles>
        <!-- Development profile: install only the bundle -->
        <profile>
            <id>autoInstallBundle</id>
            <activation>
                <activeByDefault>false</activeByDefault>
            </activation>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.sling</groupId>
                        <artifactId>maven-sling-plugin</artifactId>
                        <configuration>
                            <!-- Note that this requires /apps/myHTL62/install to exist!!          -->
                            <!--    This is typically the case when ui.apps is deployed first                -->
                            <!--    Otherwise, create /apps/myHTL62/install manually (CRXDE|Lite)  -->
                            <slingUrlSuffix>/apps/myHTL62/install/</slingUrlSuffix>
                            <failOnError>true</failOnError>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
   <dependencies>
        <!-- OSGi Dependencies -->
           
           <!-- OSGi Dependencies -->
            
        <dependency>
            <groupId>com.adobe.aem</groupId>
            <artifactId>uber-jar</artifactId>
            <classifier>obfuscated-apis</classifier>
        </dependency>
 
        <dependency>
            <groupId>org.apache.geronimo.specs</groupId>
            <artifactId>geronimo-atinject_1.0_spec</artifactId>
        </dependency>
         <dependency>
            <groupId>org.apache.felix</groupId>
            <artifactId>org.apache.felix.scr</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.felix</groupId>
            <artifactId>org.apache.felix.scr.annotations</artifactId>
        </dependency>
        <dependency>
            <groupId>biz.aQute</groupId>
            <artifactId>bndlib</artifactId>
        </dependency>
        <dependency>
            <groupId>org.osgi</groupId>
            <artifactId>org.osgi.core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.osgi</groupId>
            <artifactId>org.osgi.compendium</artifactId>
        </dependency>
        <!-- Other Dependencies -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.jcr</groupId>
            <artifactId>jcr</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.adobe.aem</groupId>
            <artifactId>aem-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.sling</groupId>
            <artifactId>org.apache.sling.models.api</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
        </dependency>
        <dependency>
            <groupId>junit-addons</groupId>
            <artifactId>junit-addons</artifactId>
        </dependency>
    </dependencies>
</project>

Build the OSGi bundle using Maven

To build the OSGi bundle by using Maven, perform these steps:

  1. Open the command prompt and go to the C:\AdobeCQ\myHTL62.
  2. Run the following maven command: mvn -PautoInstallPackage install.
  3. The OSGi component can be found in the following folder: C:\AdobeCQ\myHTL62\core\target. The file name of the OSGi component is myHTL62.core-1.0-SNAPSHOT.jar.

The command -PautoInstallPackage automatically deploys the OSGi bundle to AEM.

Create the HTL Front End Component

When you use the Maven Archetype 10 archetype to create an AEM project, a default front end project is created, as shown in the following illustration.

Default files created by Adobe Maven 10 Archetype project

Add HTL code

For the purpose of this article, the HTL code is written within a Maven Archetype 10 default component located here:

/apps/myHTL62/components/content/helloworld

Add the following code.

<p>This is your AEM HTML Template Language component:</p>
<div data-sly-use.heroTextObject="com.foo.service.core.HeroTextComponent" data-sly-test="${heroTextObject}">
       <h1>${heroTextObject.heroTextBean.headingText}</h1>
       <p>${heroTextObject.heroTextBean.description}</p> 
       <p>${heroTextObject.heroTextBean.drop}</p>  
</div>

In this example, notice data-sly-use.heroTextObject references the Java component: com.foo.service.core.HeroTextComponent.

The code:

data-sly-test="${heroTextObject}"

checks whether the heroTextObject is null. Next notice these lines of code:

<h1>${heroTextObject.heroTextBean.headingText}</h1>
<p>${heroTextObject.heroTextBean.description}</p>
<p>Check is: ${heroTextObject.heroTextBean.drop}</p>

This is how you interact with the Java server-side part of the component. In this example, you are writing out the value of the heroTextBean object's headingText class member in an HTML h1 tag. You defined the headingText data member when you created the Java code. This is the value that the user entered into the component's headingtext dialog field.

Next the value of the heroTextBean object's description class member in an HTML p tag. This is the value that the user entered into the component's description field.

Finally heroTextBean.drop returns the value that the author selected in the drop-down field (that is populated by using the DataSource object). 

Create the helloworld dialog

A dialog lets an author click on the component in the Touch UI (or Classic UI) view during design time and enter values that are used by the component. The component created in this development article lets the AEM author enter text values, which are then displayed in the AEM web page. (See the illustration shown at the beginning of this development article.)

A dialog that is built for the Touch UI is defined by using nodes of type un:structured. You define the type of control on the Touch UI dialog by setting the node's sling:resourceType property. For example, to define a text field on a Touch UI dialog, set the sling:resourceType property to granite/ui/components/foundation/form/textfield.

The following list describes some of the sling:resourceType values that are used to create the component in this development article.

  • granite/ui/components/foundation/container - defines a container for the dialog
  • granite/ui/components/foundation/layouts/tabs - defines a tab that is used in the dialog
  • granite/ui/components/foundation/section - defines a section within a tab
  • granite/ui/components/foundation/layouts/fixedcolumns - defines fixed columns
  • granite/ui/components/foundation/form/textfield - defines a text field that lets authors enter data
  • granite/ui/components/foundation/form/textarea  - defines a text area field that lets author more data than a text field

When building a dialog for the Touch UI view, you define the type of control (for example, a text field) by setting the sling:resourceType property. In contrast, when building a dialog for the classic view, you define the type of control by setting its xtype property.

Create the Touch UI Dialog

Perform these tasks to create the AEM Touch UI dialog for the helloworld component:

1. Select /apps/myHTL62/components/content/helloworld.

2. Right click and select Create, Create Node.

3. Enter the following values:

  • Name: cq:dialog
  • Type: nt:unstructured

4. Add the following properties to the cq:dialog node.

  • helppath (String) - en/cq/current/wcm/default_components.html#Carousel
  • jcr:title (String) - Hero Text
  • sling:resourceType (String) - cq/gui/components/authoring/dialog

5. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog.

6. Right click and select Create, Create Node. Enter the following values:

  • Name: content
  • Type: nt:unstructured

7. Add the following property to the content node.

  • sling:resourceType (String) - granite/ui/components/foundation/container

8. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content.

9. Right click and select Create, Create Node. Enter the following values:

  • Name: layout
  • Type: nt:unstructured

10. Add the following properties to the layout node.

  • sling:resourceType (String) - granite/ui/components/foundation/layouts/tabs
  • type (String) -nav

11. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content.

12. Right click and select Create, Create Node. Enter the following values:

  • Name: items
  • Type: nt:unstructured

13. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items.

14. Right click and select Create, Create Node. Enter the following values:

  • Name: herotext
  • Type: nt:unstructured

15. Add the following properties to the herotext node (this node represents the tab).

  • jcr:title (String) - Hero Text Properties
  • sling:resourceType (String) - granite/ui/components/foundation/section

16. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext.

17. Right click and select Create, Create Node. Enter the following values:

  • Name: layout
  • Type: nt:unstructured

18. Add the following property to the layout node.

  • sling:resourceType (String) - granite/ui/components/foundation/layouts/fixedcolumns

19. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext.

20. Right click and select Create, Create Node. Enter the following values:

  • Name: items
  • Type: nt:unstructured

21. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items.

22. Right click and select Create, Create Node. Enter the following values:

  • Name: columns
  • Type: nt:unstructured

23. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column.

24. Add the following property to the columns node.

  • sling:resourceType (String) - granite/ui/components/foundation/container

25. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column.

26. Right click and select Create, Create Node. Enter the following values:

  • Name: items
  • Type: nt:unstructured

27. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column/items.

28. Right click and select Create, Create Node. Enter the following values:

  • Name: headingText
  • Type: nt:unstructured

29. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column/items/headingText.

30. Add the following properties to the headingText node (this node represents the Heading Text input control on the dialog. See the illustration at the start of this article.)

  • fieldLabel (String) - Heading Text
  • name (String) - ./jcr:Heading
  • sling:resourceType (String) - granite/ui/components/foundation/form/textfield

31. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column/items.

32. Right click and select Create, Create Node. Enter the following values:

  • Name: description
  • Type: nt:unstructured

33. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/
items/column/items/description.

34. Add the following property to the description node (this node represents the Description input control on the dialog. See the illustration at the start of this article.)

  • fieldLabel (String) - Description
  • name (String) - ./jcr:description
  • sling:resourceType (String) - granite/ui/components/foundation/form/textarea

35. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column/items.

36. Right click and select Create, Create Node. Enter the following values:

  • Name: taskPriority
  • Type: nt:unstructured

33. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/
items/column/items/taskPriority.

34. Add the following property to the taskPriority node (this node represents the field that is drop-down populated by using the DataSource object).

  • text (String) - Dropdown
  • name (String) - ./jcr:drop
  • id (String) - jcr:drop
  • sling:resourceType (String) - /libs/granite/ui/components/foundation/form/select

35. Click on the following node: /apps/myHTL62/components/content/helloworld/cq:dialog/content/items/herotext/items/column/items/taskPriority.

36. Right click and select Create, Create Node. Enter the following values:

  • Name: datasource
  • Type: nt:unstructured

37. Add the following property to the datasource node.

  • sling:resourceType (String) - /apps/myHTL62/components/datasource (this value points to the JCR node where the JSP script is located. The JSP defines the DataSource object. )

Add a DataSource script to the component folder

Next create the JSP script that defines the DataSource object that is used to populate the drop-down field located in the component dialog. To populate a drop-down (or any selected granite control), you use an instance of com.adobe.granite.ui.components.ds.DataSource.

The following JSP defines a DataSource object that is used to populate the drop-down control.

<%@page session="false" import="
                  org.apache.sling.api.resource.Resource,
                  org.apache.sling.api.resource.ResourceUtil,
                  org.apache.sling.api.resource.ValueMap,
                  org.apache.sling.api.resource.ResourceResolver,
                  org.apache.sling.api.resource.ResourceMetadata,
                  org.apache.sling.api.wrappers.ValueMapDecorator,
                  java.util.List,
                  java.util.ArrayList,
                  java.util.HashMap,
                  java.util.Locale,
                  com.adobe.granite.ui.components.ds.DataSource,
                  com.adobe.granite.ui.components.ds.EmptyDataSource,
                  com.adobe.granite.ui.components.ds.SimpleDataSource,
                  com.adobe.granite.ui.components.ds.ValueMapResource,
                  com.day.cq.wcm.api.Page,
                  com.day.cq.wcm.api.PageManager"%><%
%><%@taglib prefix="cq" uri="http://www.day.com/taglibs/cq/1.0" %><%
%><cq:defineObjects/><%
  
// set fallback
request.setAttribute(DataSource.class.getName(), EmptyDataSource.instance());
  
ResourceResolver resolver = resource.getResourceResolver();
 
//Create an ArrayList to hold data
List<Resource> fakeResourceList = new ArrayList<Resource>();
 
ValueMap vm = null; 
 
 
//Add 5 values to drop down! 
for (int i=0; i<5; i++)
{
 
    //allocate memory to the Map instance
 vm = new ValueMapDecorator(new HashMap<String, Object>());   
 
 
 // Specify the value and text values
 String Value = "value"+i ;
 String Text = "text"+i ; 
 
    //populate the map
 vm.put("value",Value);
 vm.put("text",Text);
 
 fakeResourceList.add(new ValueMapResource(resolver, new ResourceMetadata(), "nt:unstructured", vm));
}
 
 
//Create a DataSource that is used to populate the drop-down control
DataSource ds = new SimpleDataSource(fakeResourceList.iterator());
request.setAttribute(DataSource.class.getName(), ds);
 
%>

In this example, a for loop is used to populate a Map object with data values. For each iteration of the loop, a new value and text value is created and assigned to the map object. After the loop is done, a DataSource object is created using the following code:

DataSource ds = new SimpleDataSource(fakeResourceList.iterator());

Notice that a SimpleDataSource contructor is used and the Map object's iterator method is passed. The DataSource object is passed as an argument to the request object's setAttribute method.

request.setAttribute(DataSource.class.getName(), ds);

To create the DataSource script, perform these steps using CRXDE lite:

1. Click /apps/myHTL62/components.

2. Right click, and select Create, Create Folder.

3. Name the folder datasource.

4. Click //apps/myHTL62/components/datasource.

5. Right click, and select Create, Create File.

6. Name the file datasource.jsp.

7. Add the code displayed in this section to this JSP.

Open the component dialog

In edit mode at this URL:

http://localhost:4502/editor.html/content/myHTL62/en.html

open the HelloWorld component dialog. You will see the drop-down field populated with values defined in the Datasource script. When an author selects a value, it is displayed in the web page.  

The following illustration shows the AEM web page if the checkbox is checked. 

The result when a drop-down value is selected

See also

Join the AEM community at: Adobe Experience Manager Community

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