# RequestSizeCallback Function

> Callback function for requests expecting a Size object.

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

---

### Description

Callback function for requests expecting a [Size](https://docs.textcontrol.com/ds-server/reference/javascript/size/llms-full.txt) object.

### Syntax

```javascript
function(<Size> size)
```

### Examples

The following example demonstrates `RequestSizeCallback` in a practical document-editing workflow. Callback function for requests expecting a Size object.

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

function requestSizeCallback(size) {
    console.log("size:", size);
}

function useRequestSizeCallback(frameBase) {
    frameBase.getSize(requestSizeCallback, onTxError);
}
```

---

## Nearby

- **Previous:** [RequestSignerDataCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requestsignerdatacallback/llms-full.txt)
- **Next:** [RequestStatusBarBorderStyleCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requeststatusbarborderstylecallback/llms-full.txt)