> For the complete documentation index, see [llms.txt](https://guardian.hedera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guardian.hedera.com/docs/develop/guardian/standard-registry/policies/policy-creation/introduction/filtersaddonblock.md).

# filtersAddOnBlock

{% hint style="info" %}
Note: This block is used for dropdown. You can add multiple blocks to 1 grid to combine different data.
{% endhint %}

### Properties

| Block Property | Definition                                                                                                                                       | Example Input                                                         |
| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------- |
| type           | A block for providing dynamic filters to DocumentsSourceAddOn Block                                                                              | **filtersAddOnBlock** (Can't be changed).                             |
| tag            | Unique name for the logic block.                                                                                                                 | report\_\_by\_\_project                                               |
| permissions    | Which entity has rights to interact at this part of the workflow.                                                                                | Installer.                                                            |
| defaultActive  | Shows whether this block is active at this time and whether it needs to be shown.                                                                | Checked or unchecked.                                                 |
| dependencies   | Automatic update. The block is automatically re-rendered if any of the linked components gets updated.                                           | Select the appropriate block from the dropdown.                       |
| type           | Filter type, so far only Dropdown type - allows the user to select one of the available values.                                                  | The list of available values is provided by DocumentsSourceAddonBlock |
| canBeEmpty     | if true - if the filter is empty, then it is not taken into account when filtering. If false - then after filtering there will be an empty array | checked or unchecked                                                  |
| field          | the field by which the filtering will take place                                                                                                 | document.credentialSubject.0.ref                                      |
| optionName     | the field to be used as the label                                                                                                                | document.credentialSubject.0.id                                       |
| optionValue    | the field that will act as the value                                                                                                             | document.credentialSubject.0.id                                       |

### UI Properties

| Filter Property | Definition             | Example Input |
| --------------- | ---------------------- | ------------- |
| Title           | Filter title           | Filter1       |
| Button Context  | text inside the button | Project       |

### API Parameters

<mark style="color:blue;">`GET`</mark> `/policies/{policyId}/blocks/{uuid}`

#### Path Parameters

| Name                                       | Type   | Description |
| ------------------------------------------ | ------ | ----------- |
| policyID<mark style="color:red;">\*</mark> | String | Policy ID   |
| uuid                                       | String | Block UUID  |

{% tabs %}
{% tab title="200: OK Successful Operation" %}

```javascript
{
  "id": "a4b87158-7428-48ac-b69b-762f96777edc",
  "blockType": "filtersAddon",
  "type": "dropdown",
  "uiMetaData": {
    "options": [],
    "content": "Device"
  },
  "data": [
    {
      "name": "device1",
      "value": "did:hedera:testnet:EHXwuE486eSD4yGXr6qTNLstmb8H1B2Jn4kx3PeWZzjv_0.0.1675232535045"
    }
  ],
  "optionName": "document.credentialSubject.0.field4.field0",
  "optionValue": "document.credentialSubject.0.id",
  "filterValue": "did:hedera:testnet:EHXwuE486eSD4yGXr6qTNLstmb8H1B2Jn4kx3PeWZzjv_0.0.1675232535045"
}

```

{% endtab %}
{% endtabs %}

<mark style="color:green;">`POST`</mark> `/policies/{policyId}/blocks/{uuid}`

#### Path Parameters

| Name                                       | Type   | Description |
| ------------------------------------------ | ------ | ----------- |
| policyId<mark style="color:red;">\*</mark> | String | Policy ID   |
| uuid<mark style="color:red;">\*</mark>     | String | Block UUID  |

#### Request Body

| Name                                          | Type   | Description      |
| --------------------------------------------- | ------ | ---------------- |
| filterValue<mark style="color:red;">\*</mark> | String | New filter value |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://guardian.hedera.com/docs/develop/guardian/standard-registry/policies/policy-creation/introduction/filtersaddonblock.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.