# Javascript: RulerBarViewGenerator.setScaleUnit Method

> Sets the scale unit of the ruler bar.

- **Product:** TX Text Control .NET Server
- **Section:** Reference
- **Kind:** Method
- **Introduced:** 30.0
- **Path:** TX Text Control .NET Server > Reference > JavaScript API > Javascript: RulerBarViewGenerator.setScaleUnit Method
- **325 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/rulerbarviewgenerator/setscaleunit-method/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/rulerbarviewgenerator/setscaleunit-method/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/rulerbarviewgenerator/setscaleunit-method/llms-full.txt

---

### Description

Sets the scale unit of the ruler bar.

### Syntax

```javascript
<void> RulerBarViewGenerator.setScaleUnit(<RulerBarScaleUnit> value, [<EmptyRequestCallback> callback], [<ErrorCallback> errorCallback])
```

### Parameters

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

### Examples

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

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

TXTextControl.rulerBar.setScaleUnit(
    TXTextControl.RulerBarScaleUnit.Auto,
    function() {
        console.log("set scale unit completed.");
    },
    onTxError
);
```

---

## Nearby

- **Previous:** [Javascript: RulerBarViewGenerator.setReadOnly Method](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/rulerbarviewgenerator/setreadonly-method/llms-full.txt)
- **Next:** [RulerBarViewGeneratorColors Object](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/rulerbarviewgeneratorcolors/llms-full.txt)