# RequestPageNumberFieldCallback Function

> Callback function for requests expecting a PageNumberField value.

- **Product:** TX Text Control .NET Server
- **Section:** Reference
- **Kind:** Function
- **Introduced:** 30.0
- **Path:** TX Text Control .NET Server > Reference > JavaScript API > RequestPageNumberFieldCallback Function
- **299 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/requestpagenumberfieldcallback/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/requestpagenumberfieldcallback/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/requestpagenumberfieldcallback/llms-full.txt

---

### Description

Callback function for requests expecting a [PageNumberField](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/pagenumberfield/llms-full.txt) value.

### Syntax

```javascript
function(<PageNumberField> field)
```

### Examples

The following example demonstrates `RequestPageNumberFieldCallback` in a practical document-editing workflow. Callback function for requests expecting a PageNumberField value.

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

function requestPageNumberFieldCallback(field) {
    console.log("field:", field);
}

TXTextControl.textParts.getMainText(function(mainText) {
    const pageNumberFields = mainText.pageNumberFields;
    pageNumberFields.getItem(requestPageNumberFieldCallback, onTxError, 25);
}, onTxError);
```

---

## Nearby

- **Previous:** [RequestPageCallback Function](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/requestpagecallback/llms-full.txt)
- **Next:** [RequestPaperSizeCallback Function](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/javascript/requestpapersizecallback/llms-full.txt)