# RequestLineCallback Function

> Callback function for requesting a line.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Function
- **Path:** DS Server > Reference > JavaScript API > RequestLineCallback Function
- **250 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestlinecallback/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestlinecallback/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestlinecallback/llms-full.txt

---

### Description

Callback function for requesting a line.

### Syntax

```javascript
function(<Line> result)
```

### Examples

The following example demonstrates `RequestLineCallback` in a practical document-editing workflow. Callback function for requesting a line.

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

function requestLineCallback(result) {
    console.log("result:", result);
}

function useRequestLineCallback(lines) {
    lines.getItem(requestLineCallback, -1, onTxError);
}
```

---

## Nearby

- **Previous:** [RequestJustificationCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requestjustificationcallback/llms-full.txt)
- **Next:** [RequestListFormatCharacterCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requestlistformatcharactercallback/llms-full.txt)