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ในบทเรียนนี้เราจะทำตาม guideline of developing a plugin เพื่อพัฒนาปลั๊กอิน File Link Datalist Formatter ของเรา โปรดอ้างอิงถึงบทเรียนแรก วิธีการพัฒนา Bean Shell Hash Variable สำหรับรายละเอียดเพิ่มเติม

1. ปัญหาคืออะไร?

เรามีไฟล์ที่อัพโหลดโดยใช้ฟิลด์อัพโหลดไฟล์ในฟอร์ม เราต้องการแสดงชื่อไฟล์เป็นลิงค์สำหรับดาวน์โหลดไฟล์ใน datalist ของเรา

2. ความคิดของคุณในการแก้ปัญหาคืออะไร?

We can develop a ปลั๊กอินตัวจัดรูปแบบคอลัมน์ข้อมูล (Datalist Column Formatter Plugin) to convert the value to a link.

3. อินพุตที่จำเป็นสำหรับปลั๊กอินของคุณคืออะไร?

The file download link format of Joget Workflow is

/jw/web/client/app/{appId}/{appVersion}/form/download/{formId}/{recordId}/{fileName}.?attachment=true

Sample:

http://localhost:8080/jw/web/client/app/test/1/form/download/testFile/f6946830-c0a80070-48cad9b7-8b971682/CHANGES.txt.?attachment=true

From the link format, we need to get the following information from admin user.

  1. Form Id : the form that contains the File Upload field.
  2. Download as Attachment: Whether or not to add "?attachedment=true" in link.

4. What is the output and expected outcome of your plugin?

The file name is displayed as a link in Datalist.

5. Is there any resources/API that can be reuse?

We can refer to the File Upload Field on how to generate the download link of the file.

6. Prepare your development environment

We need to always have our Joget Workflow Source Code ready and builded by following this guideline

The following of this tutorial is prepared with a Macbook Pro and Joget Source Code version 5.0.0. Please refer to แนวทางสำหรับการพัฒนาปลั๊กอิน for other platform command.

Let said our folder directory as following. 

- Home
  - joget
    - plugins
    - jw-community
      -5.0.0

The "plugins" directory is the folder we will create and store all our plugins and the "jw-community" directory is where the Joget Workflow Source code stored.

Run the following command to create a maven project in "plugins" directory.

cd joget/plugins/
~/joget/jw-community/5.0.0/wflow-plugin-archetype/create-plugin.sh org.joget.tutorial file_link_datalist_formatter 5.0.0

Then, the shell script will ask us to key in a version for your plugin and ask us for confirmation before generate the maven project.

Define value for property 'version':  1.0-SNAPSHOT: : 5.0.0
[INFO] Using property: package = org.joget.tutorial
Confirm properties configuration:
groupId: org.joget.tutorial
artifactId: file_link_datalist_formatter
version: 5.0.0
package: org.joget.tutorial
Y: : y

We should get "BUILD SUCCESS" message shown in our terminal and a "file_link_datalist_formatter" folder created in "plugins" folder.

Open the maven project with your favour IDE. I will be using NetBeans.  

7. Just code it!

a. Extending the abstract class of a plugin type

Create a "FileLinkDatalistFormatter" class under "org.joget.tutorial" package. Then, extend the class with org.joget.apps.datalist.model.DataListColumnFormatDefault abstract class. Please refer to ปลั๊กอินตัวจัดรูปแบบคอลัมน์ข้อมูล (Datalist Column Formatter Plugin).

b. Implement all the abstract methods

As usual, we have to implement all the abstract methods. We will using AppPluginUtil.getMessage method to support i18n and using constant variable MESSAGE_PATH for message resource bundle directory.

 

Implementation of all basic abstract methods
package org.joget.tutorial;
import org.joget.apps.app.service.AppPluginUtil;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.datalist.model.DataList;
import org.joget.apps.datalist.model.DataListColumn;
import org.joget.apps.datalist.model.DataListColumnFormatDefault;

public class FileLinkDatalistFormatter extends DataListColumnFormatDefault {
    
    private final static String MESSAGE_PATH = "messages/FileLinkDatalistFormatter";
    
    public String getName() {
        return "File Link Datalist Formatter";
    }
 
    public String getVersion() {
        return "5.0.0";
    }
    
    public String getClassName() {
        return getClass().getName();
    }
 
    public String getLabel() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.tutorial.FileLinkDatalistFormatter.pluginLabel", getClassName(), MESSAGE_PATH);
    }
    
    public String getDescription() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.tutorial.FileLinkDatalistFormatter.pluginDesc", getClassName(), MESSAGE_PATH);
    }
 
    public String getPropertyOptions() {
        return AppUtil.readPluginResource(getClassName(), "/properties/fileLinkDatalistFormatter.json", null, true, MESSAGE_PATH);
    }
 
    public String format(DataList dataList, DataListColumn column, Object row, Object value) {
        throw new UnsupportedOperationException("Not supported yet."); 
    }
}

Then, we have to do a UI for admin user to provide inputs for our plugin. In getPropertyOptions method, we already specify our ตัวเลือกคุณสมบัติปลั๊กอิน definition file is locate at "/properties/fileLinkDatalistFormatter.json". Let us create a directory "resources/properties" under "file_link_datalist_formatter/src/main" directory. After create the directory, create a file named "fileLinkDatalistFormatter.json" in the "properties" folder.

In the properties definition options file, we will need to provide options as below. Please note that we can use "@@message.key@@" syntax to support i18n in our properties options.

[{
    title : '@@datalist.fileLinkFormatter.config@@',
    properties : [{
        name : 'formDefId',
        label : '@@datalist.fileLinkFormatter.form@@',
        type : 'selectbox',
        options_ajax : '[CONTEXT_PATH]/web/json/console/app[APP_PATH]/forms/options',
        required : 'True'
    },
    {
        name : 'attachment',
        label : '@@datalist.fileLinkFormatter.attachment@@',
        type : 'checkbox',
        options : [{
            value : 'true',
            label : ''
        }]
    }]
}]
 
Once we done the properties option to collect input, we can work on the main method of the plugin which is format method.

 

    public String format(DataList dataList, DataListColumn column, Object row, Object value) {
        String result = (String) value;
 
        if (result != null && !result.isEmpty()) {
            try {
                String formDefId = getPropertyString("formDefId");
                AppDefinition appDef = AppUtil.getCurrentAppDefinition();
                result = "";
 
                String attachment = "";
                if ("true".equals(getPropertyString("attachment"))) {
                    attachment = "?attachment=true";
                }
 
                //get the id of this record
                String primaryKeyValue = (String) LookupUtil.getBeanProperty(row, dataList.getBinder().getPrimaryKeyColumnName());
                
                HttpServletRequest request = WorkflowUtil.getHttpServletRequest();
 
                //suport for multi values
                for (String v : value.toString().split(";")) {
                    if (!v.isEmpty()) {
                        // determine actual path for the file uploads
                        String fileName = v;
                        String encodedFileName = fileName;
 
                        try {
                            encodedFileName = URLEncoder.encode(fileName, "UTF8").replaceAll("\\+", "%20");
                        } catch (UnsupportedEncodingException ex) {
                            // ignore
                        }
 
                        String filePath = request.getContextPath() + "/web/client/app/" + appDef.getAppId() + "/" + appDef.getVersion().toString() + "/form/download/" + formDefId + "/" + primaryKeyValue + "/" + encodedFileName + "." + attachment;
 
                        if (!result.isEmpty()) {
                            result += ", ";
                        }
                        result += "<a href=\""+filePath+"\" target=\"_blank\">"+StringUtil.stripAllHtmlTag(fileName)+"</a>";
                    }
                }
            } catch (Exception e) {
                LogUtil.error(getClassName(), e, "");
            }
        }
        return result;
    }

 

c. Manage the dependency libraries of your plugin

Our plugin is using org.displaytag.util.LookupUtil and  class, it required displaytag and jsp-api library. So, we have to add it to our POM file.

<!-- Change plugin specific dependencies here -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>displaytag</groupId>
            <artifactId>displaytag</artifactId>
            <version>1.2</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-api</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>jcl104-over-slf4j</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
<!-- End change plugin specific dependencies here -->

d. Make your plugin internationalization (i18n) ready

We are using i18n message key in getLabel and getDescription method. We also used i18n message key in our properties options definition as well. So, we will need to create a message resource bundle properties file for our plugin.

Create directory "resources/messages" under "file_link_datalist_formatter/src/main" directory. Then, create a "FileLinkDatalistFormatter.properties" file in the folder. In the properties file, let add all the message keys and its label as below.

org.joget.tutorial.FileLinkDatalistFormatter.pluginLabel=File Link Datalist Formatter
org.joget.tutorial.FileLinkDatalistFormatter.pluginDesc=To format the column value as attachment download link.
datalist.fileLinkFormatter.config=Configure File Link Formatter
datalist.fileLinkFormatter.form=Form
datalist.fileLinkFormatter.attachment=Download as Attachment?

e. Register your plugin to Felix Framework

We will have to register our plugin class in Activator class (Auto generated in the same class package) to tell Felix Framework that this is a plugin.

    public void start(BundleContext context) {
        registrationList = new ArrayList<ServiceRegistration>();
        //Register plugin here
        registrationList.add(context.registerService(FileLinkDatalistFormatter.class.getName(), new FileLinkDatalistFormatter(), null));
    } 

f. สร้างและทดสอบ

ให้สร้างปลั๊กอินของเรา เมื่อกระบวนการสร้างเสร็จสิ้นเราจะพบไฟล์ "file_link_datalist_formatter-5.0.0.jar" ถูกสร้างขึ้นภายใต้ไดเรกทอรี "file_link_datalist_formatter / target"

จากนั้นให้อัปโหลดปลั๊กอินไปที่ Manage Plugins. หลังจากอะพโหลดไฟล์ jar, ตรวจสอบอีกครั้งว่าปลั๊กอินนั้นถูกอัพโหลดและเปิดใช้งานอย่างถูกต้อง

ให้สร้าง CRUD ในมุมมองของเราเพื่อทดสอบปลั๊กอินของเรา ในรายการให้กำหนดค่าคอลัมน์ฟิลด์อัปโหลดไฟล์ดังนี้

ในรายการ CRUD เราจะเห็นว่าไฟล์ของเราถูกแปลงเป็นลิงค์

8. ขั้นต่อไป แชร์หรือขาย

คุณสามารถดาวน์โหลด source code จาก file_link_datalist_formatter.zip.

หากต้องการดาวน์โหลด jar ปลั๊กอินที่พร้อมใช้งานโปรดค้นหา http://marketplace.joget.org/.

 

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