# Javascript: Selection.setAutoBaseline Method

> Sets values specifying automatic sub- or superscripted text. When using automatic sub- and superscript the font is scaled and moved above or below the baseline with values defined through the font itself. Automatic sub- and superscript can be combined with a user-defined baseline which can be set with the Baseline property.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Method
- **Introduced:** 30.0
- **Path:** DS Server > Reference > JavaScript API > Javascript: Selection.setAutoBaseline Method
- **434 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript/selection/setautobaseline-method/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript/selection/setautobaseline-method/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript/selection/setautobaseline-method/llms-full.txt

---

### Description

Sets values specifying automatic sub- or superscripted text. When using automatic sub- and superscript the font is scaled and moved above or below the baseline with values defined through the font itself. Automatic sub- and superscript can be combined with a user-defined baseline which can be set with the Baseline property.

### Syntax

```javascript
<void> Selection.setAutoBaseline(<AutoBaseline> autoBaseline, [<EmptyRequestCallback> callback], [<ErrorCallback> errorCallback])
```

### Parameters

| Parameter | Description |
|---|---|
| autoBaseline | The auto baseline of the selected text. |
| callback | Optional. Is called when the operation completed. |
| errorCallback | Optional. Is called when the operation failed with an error. |

### Examples

The following example demonstrates `Selection.setAutoBaseline` in a practical document-editing workflow. It sets values specifying automatic sub- or superscripted text. When using automatic sub- and superscript the font is scaled and moved above or below the baseline with values defined through the font itself. Automatic sub- and superscript can be combined with a user-defined baseline which can be set with the Baseline property.

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

TXTextControl.selection.setAutoBaseline(
    TXTextControl.AutoBaseline.Superscript,
    function() {
        console.log("set auto baseline completed.");
    },
    onTxError
);
```

---

## Nearby

- **Previous:** [Javascript: Selection.sectionFormat Property](https://docs.textcontrol.com/ds-server/reference/javascript/selection/sectionformat-property/llms-full.txt)
- **Next:** [Javascript: Selection.setBaseline Method](https://docs.textcontrol.com/ds-server/reference/javascript/selection/setbaseline-method/llms-full.txt)