# Dropdown Block Addon (dropdownBlockAddon)

The purpose of this block is to display an interactive dropdown menu in the interfaceDocumentsSourceBlock.

## Usage

As shown in the example below, dropdownBlockAddon blocks should be placed inside interfaceDocumentsSourceBlock blocks. Source addons, which return documents for the dropdown, should be placed inside dropdownBlockAddon.

<figure><img src="/files/PQ1hl29SgSXgMu561M9m" alt=""><figcaption></figcaption></figure>

## Properties

| Property Name                | Description                                                                   | Example                             | Status |
| ---------------------------- | ----------------------------------------------------------------------------- | ----------------------------------- | ------ |
| Option Name (*optionName*)   | The label (name) which is shown in dropdown items.                            | document.credentialSubject.0.field0 |        |
| Option Value (*optionValue*) | The value which will be used when a specific item is clicked.                 | document.credentialSubject.0.id     |        |
| Field (*field*)              | The field in selected document which will be populated with the option value. | assignedTo                          |        |

<figure><img src="/files/tht1AYv0Z5sZmqXUWXA3" alt=""><figcaption></figcaption></figure>

## Events

Dropdown block addon events will be automatically added to document source.

<figure><img src="/files/JtX6AQ11kqsUZuLK9KKa" alt=""><figcaption></figcaption></figure>

## API

The API for the dropdownBlockAddon has both GET and POST methods:

1. Example response to the GET request:

```
{
    "id": "47169fdc-900f-4e07-abb4-5510d7be1175",
    "blockType": "dropdownBlockAddon",
    "optionName": "document.credentialSubject.0.field0",
    "optionValue": "document.credentialSubject.0.id",
    "field": "assignedTo",
    "documents": [
        {
            "name": "example",
            "optionValue": "did:hedera:testnet:9XvzF671JeyoVRg8PvSZBTTyKyrvnZu2Mz7qE6FZXY8P_0.0.4481265",
            "value": "66b28683d029375c10f0f4ef"
        }
    ],
}

```

A response to the GET request includes all block settings and:

● documents - Dropdown options

2. Example payload for the POST request:

```
{
  "documentId": "66b28672d029375c10f0f4b6",
  "dropdownDocumentId": "66b28683d029375c10f0f4ef"
}
```

● documentId - Selected document

● dropdownDocumentId - Dropdown item which was clicked


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guardian.hedera.com/guardian-dev/guardian/standard-registry/policies/policy-creation/introduction/dropdown-block-addon-dropdownblockaddon.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.