# RequestSubTextPartsCallback Function

> Callback function for requests retrieving an array of SubTextPart objects.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Function
- **Introduced:** 32.0
- **Path:** DS Server > Reference > JavaScript API > RequestSubTextPartsCallback Function
- **374 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestsubtextpartscallback/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestsubtextpartscallback/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requestsubtextpartscallback/llms-full.txt

---

### Description

Callback function for requests retrieving an array of [SubTextPart](https://docs.textcontrol.com/ds-server/reference/javascript/subtextpart/llms-full.txt) objects.

### Syntax

```javascript
function(<SubTextPart[]> subTextParts)
```

### Examples

The following example demonstrates `RequestSubTextPartsCallback` in a practical document-editing workflow. Callback function for requests retrieving an array of SubTextPart objects.

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

function requestSubTextPartsCallback(subTextParts) {
    console.log("sub text parts:", subTextParts);
}

TXTextControl.textParts.getMainText(function(mainText) {
    const subTextParts = mainText.subTextParts;
    subTextParts.getItem(function(subTextPart) {
        if (!subTextPart) {
            console.warn("No sub text part is available at the current input position.");
            return;
        }
    
        subTextPart.getChildren(requestSubTextPartsCallback, onTxError);
    }, onTxError);
}, onTxError);
```

---

## Nearby

- **Previous:** [RequestSubTextPartCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requestsubtextpartcallback/llms-full.txt)
- **Next:** [RequestTableCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requesttablecallback/llms-full.txt)