# Javascript: RulerBarViewGenerator.getScaleUnit Method

> Gets the scale unit of the ruler bar.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Method
- **Introduced:** 30.0
- **Path:** DS Server > Reference > JavaScript API > Javascript: RulerBarViewGenerator.getScaleUnit Method
- **348 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript/rulerbarviewgenerator/getscaleunit-method/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript/rulerbarviewgenerator/getscaleunit-method/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript/rulerbarviewgenerator/getscaleunit-method/llms-full.txt

---

### Description

Gets the scale unit of the ruler bar.

### Syntax

```javascript
<void> RulerBarViewGenerator.getScaleUnit(<RequestRulerBarScaleUnitCallback> callback, [<ErrorCallback> errorCallback])
```

### Parameters

| Parameter | Description |
|---|---|
| callback | Receives the property value. |
| errorCallback | Optional. Is called when the operation failed with an error. |

### Examples

The following example demonstrates `RulerBarViewGenerator.getScaleUnit` in a practical document-editing workflow. It gets the scale unit of the ruler bar.

```javascript
function onTxError(error) {
    console.error("TX Text Control error:", error.msg);
    error.handled = true;
}

TXTextControl.rulerBar.getScaleUnit(
    function(scaleUnit) {
        if (!scaleUnit) {
            console.warn("No ruler bar scale unit was returned.");
            return;
        }
        
        console.log("get scale unit result:", scaleUnit);
    },
    onTxError
);
```

---

## Nearby

- **Previous:** [Javascript: RulerBarViewGenerator.getReadOnly Method](https://docs.textcontrol.com/ds-server/reference/javascript/rulerbarviewgenerator/getreadonly-method/llms-full.txt)
- **Next:** [Javascript: RulerBarViewGenerator.resetDisplayColors Method](https://docs.textcontrol.com/ds-server/reference/javascript/rulerbarviewgenerator/resetdisplaycolors-method/llms-full.txt)