GridExporterAddon

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GridExporterAddon

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# Grid Exporter Add-on

This is an addon that allows to export Vaadin's grid data to some formats like Excel, Docx, PDF and CSV. It works with Apache POI 5.2.2, but it works partially (docx and pdf won't work) with older versions (for using an older versions you need to exclude the apache poi transitive dependencies from this projects and add them with the explicit version that you want to use).

## Features

* Can configure which columns to export
* Other templates can be used besides the basic templates
* Optionally can create the export buttons automatically (default)

## Supported versions

| Vaadin Version | Add-on Version |
|---|---|
| 24-25 | 3.x |
| 23 | 1.x |

## Online demo

[Online demo here](https://addonsv24.flowingcode.com/gridexporter)

## Download release

[Available in Vaadin Directory](https://vaadin.com/directory/component/grid-exporter-add-on)

### Maven install

Add the following dependencies in your pom.xml file:

```xml
<dependency>
   <groupId>org.vaadin.addons.flowingcode</groupId>
   <artifactId>grid-exporter-addon</artifactId>
   <version>X.Y.Z</version>
</dependency>
```

```xml
<repository>
   <id>vaadin-addons</id>
   <url>https://maven.vaadin.com/vaadin-addons</url>
</repository>
```

For SNAPSHOT versions see [here](https://maven.flowingcode.com/snapshots/).

## Building and running demo

- git clone repository
- mvn clean install jetty:run

To see the demo, navigate to http://localhost:8080/

## Release notes

See [here](https://github.com/FlowingCode/GridExporterAddon/releases)

## Migration to DownloadHandler API (Version 3.1.0+)

**Important for Vaadin 25 compatibility**: Starting with version 3.1.0, Grid Exporter Add-on introduces new `DownloadHandler`-based methods to replace the deprecated `StreamResource` methods.

### Quick Migration

**Old API (Deprecated):**
```java
exporter.getExcelStreamResource()
exporter.getDocxStreamResource()
exporter.getPdfStreamResource()
exporter.getCsvStreamResource()
```

**New API (Recommended):**
```java
exporter.getExcelDownloadHandler()
exporter.getDocxDownloadHandler()
exporter.getPdfDownloadHandler()
exporter.getCsvDownloadHandler()
```

### Requirements

- **Vaadin 24.8.0 or later** is required to use the new `DownloadHandler` methods
- Old `StreamResource` methods will continue to work until they are removed in a future release
- See [MIGRATION_GUIDE.md](./MIGRATION_GUIDE.md) for detailed migration instructions

## Issue tracking

The issues for this add-on are tracked on its github.com page. All bug reports and feature requests are appreciated.

## Contributions

Contributions are welcome. There are two primary ways you can contribute: by reporting issues or by submitting code changes through pull requests. To ensure a smooth and effective process for everyone, please follow the guidelines below for the type of contribution you are making.

#### 1. Reporting Bugs and Requesting Features

Creating an issue is a highly valuable contribution. If you've found a bug or have an idea for a new feature, this is the place to start.

* Before creating an issue, please check the existing issues to see if your topic is already being discussed.
* If not, create a new issue, choosing the right option: "Bug Report" or "Feature Request". Try to keep the scope minimal but as detailed as possible.

> **A Note on Bug Reports**
> 
> Please complete all the requested fields to the best of your ability. Each piece of information, like the environment versions and a clear description, helps us understand the context of the issue.
> 
> While all details are important, the **[minimal, reproducible example](https://stackoverflow.com/help/minimal-reproducible-example)** is the most critical part of your report. It's essential because it removes ambiguity and allows our team to observe the problem firsthand, exactly as you are experiencing it.

#### 2. Contributing Code via Pull Requests

As a first step, please refer to our [Development Conventions](https://github.com/FlowingCode/DevelopmentConventions) page to find information about Conventional Commits & Code Style requirements.

Then, follow these steps for creating a contribution:
 
- Fork this project.
- Create an issue to this project about the contribution (bug or feature) if there is no such issue about it already. Try to keep the scope minimal.
- Develop and test the fix or functionality carefully. Only include minimum amount of code needed to fix the issue.
- For commit message, use [Conventional Commits](https://github.com/FlowingCode/DevelopmentConventions/blob/main/conventional-commits.md) to describe your change.
- Send a pull request for the original project.
- Comment on the original issue that you have implemented a fix for it.

## License & Author

This add-on is distributed under Apache License 2.0. For license terms, see LICENSE.txt.

Grid Exporter Addon is written by Flowing Code S.A.

# Developer Guide

After creating a grid, the method createFor can be used to create the exporter that then can be configured. It is important that the grid should always be completely configured (headers, footers, etc.), before creating the exporter, because if not, it will not work properly. Another important consideration is to create the exporter before attaching the grid, creating the grid exporter after the grid is attached will raise an exception (see [this issue](https://github.com/FlowingCode/GridExporterAddon/issues/8))

GridExporter<Person> exporter = GridExporter.createFor(grid, "/custom-template.xlsx", "/custom-template.docx");
    HashMap<String,String> placeholders = new HashMap<>();
    placeholders.put("${date}", new SimpleDateFormat().format(Calendar.getInstance().getTime()));
    exporter.setExportColumn(nameColumn, false);
    exporter.setExportColumn(lastNameColumn, true);
    exporter.setAdditionalPlaceHolders(placeholders);
    exporter.setSheetNumber(1);
    exporter.setCsvExportEnabled(false);
    exporter.setNumberColumnFormat(budgetColumn, "$#,###.##", "$#,###.##");
    exporter.setDateColumnFormat(dateColumn1, "dd/MM/yyyy");
    exporter.setTitle("People information");
    exporter.setFileName("GridExport" + new SimpleDateFormat("yyyyddMM").format(Calendar.getInstance().getTime()));

Custom templates can be added anywhere in the classpath (ie: src/main/resources)

## Note when deploying with docker using Alpine images

Apply [this fix](https://github.com/docker-library/openjdk/issues/73#issuecomment-451102068) as mentioned in #15 to avoid the "Cannot load from short array because "sun.awt.FontConfiguration.head" is null error.

## Special configuration when using Spring

By default, Vaadin Flow only includes ```com/vaadin/flow/component``` to be always scanned for UI components and views. For this reason, the addon might need to be whitelisted in order to display correctly.

To do so, just add ```com.flowingcode``` to the ```vaadin.whitelisted-packages``` property in ```src/main/resources/application.properties```, like:

```vaadin.whitelisted-packages = com.vaadin,org.vaadin,dev.hilla,com.flowingcode```
 
More information on Spring whitelisted configuration [here](https://vaadin.com/docs/latest/integrations/spring/configuration/#configure-the-scanning-of-packages).

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