# Radio

The **Radio** field is an input component used to allow users to **select exactly one value** from a predefined list of options.\
It ensures that the selected value is **mutually exclusive**, meaning only one option can be chosen at a time.

Radio fields are suitable for controlled value selection where data consistency is required.

***

### Purpose of Radio Field

The Radio field is commonly used to:

* Enforce single‑choice selection
* Restrict input to predefined values
* Improve data validation and consistency
* Represent enumerated or boolean‑style data

**Typical use cases**

* Status (Active / Inactive)
* Gender
* Payment Type
* Yes / No options

***

### Adding and Configuring a Radio Field

To configure a Radio field:

1. Drag the **Radio** field into a Module layout
2. Click the **Edit (pencil) icon**
3. The **Radio Configuration** window opens

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***

### Radio Configuration Properties

#### 1️. Core Identification

| Property  | Mandatory | Description                        |
| --------- | --------- | ---------------------------------- |
| **MF ID** | Yes       | System‑generated unique identifier |

***

#### 2️. Radio Display Data

Defines individual radio options.

| Property          | Mandatory | Description                                |
| ----------------- | --------- | ------------------------------------------ |
| **Value**         | Yes       | Stored value for the option                |
| **ShowName**      | Yes       | Display text shown to the user             |
| **Seq**           | No        | Display order of the option                |
| **Default Check** | No        | Sets the option as default selected        |
| **ColumnCount**   | No        | Number of columns to display radio options |
| **Source Tag**    | No        | JavaScript applied at item level           |

***

#### 3️. Database Mapping

| Property      | Mandatory | Description                          |
| ------------- | --------- | ------------------------------------ |
| **Field\_ID** | No        | Database column mapped to this field |

***

#### 4️. Display & Search Configuration

| Property              | Description                                          |
| --------------------- | ---------------------------------------------------- |
| **ShowFieldName**     | Label displayed on screen (auto‑generated supported) |
| **SearchCriteria**    | Enables field as search criteria                     |
| **ShowSearch**        | Displays field in search result table                |
| **SearchFromTo**      | Enables range‑based search                           |
| **SearchPreLike**     | Enables wildcard `%XXX` search                       |
| **SearchLike**        | Enables wildcard `XXX%` search                       |
| **SearchIgnoreCase**  | Case‑insensitive search                              |
| **JoinSearchTable**   | Used for JOIN‑based search SQL                       |
| **SearchFieldGroup**  | Horizontal grouping in search screen                 |
| **SearchCriteriaSeq** | Vertical position in search criteria                 |
| **ShowSearchSeq**     | Order in search results                              |

***

#### 5️. UI & Behavior Flags

| Property        | Description                             |
| --------------- | --------------------------------------- |
| **Alignment**   | Text alignment: Left / Center / Right   |
| **OnlyGuiFlag** | UI‑only field (not persisted to DB)     |
| **ViewFlag**    | Displays field in read‑only mode        |
| **KeepHistory** | Persists value change history           |
| **FilterFlag**  | Filters 1‑Many records using this value |
| **Authen**      | Applies IAM‑based authorization         |
| **MergeFlag**   | Field spans across multiple columns     |

***

#### 6️. Validation Rules (Validate Code)

Validation logic applied before saving.

| Code                 | Description                      |
| -------------------- | -------------------------------- |
| `CHECK_NULL`         | Prevents saving if value is null |
| `CHECK_INTEGER`      | Ensures integer value            |
| `CHECK_DECIMAL`      | Ensures decimal value            |
| `CHECK_EMAIL_FORMAT` | Validates email format           |

***

### Usage Guidelines

* Use Radio when **only one value must be selected**
* Avoid using for free‑text input
* Always define clear `ShowName` values
* Set a default value when applicable
* Map to database field when persistent storage is required
* Use IAM authorization for role‑based visibility


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