---
title: "ViewerClientSideOptions..::.postBackOnZoomed Property "
canonical: https://www.graphicsmill.com/docs/gm5/P_J_GraphicsMill_ViewerClientSideOptions_postBackOnZoomed.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# ViewerClientSideOptions.postBackOnZoomed Property 
 
Gets/sets a value which turns automatic postback for the [BaseViewer.zoomed](https://www.graphicsmill.com/docs/gm5/E_J_GraphicsMill_BaseViewer_zoomed.htm.md) event on.
 
**Namespace:** [GraphicsMill](https://www.graphicsmill.com/docs/gm5/N_J_GraphicsMill.htm.md)
 **Assembly:** Aurigma.GraphicsMill.AjaxControls (in Aurigma.GraphicsMill.AjaxControls.dll)
 
## Syntax
  
```
function get_postBackOnZoomed();
function set_postBackOnZoomed(value);
```
 
### Property Value
The Boolean value which turns automatic postback for the [BaseViewer.zoomed](https://www.graphicsmill.com/docs/gm5/E_J_GraphicsMill_BaseViewer_zoomed.htm.md) event on.
 
## Remarks
  
If [BaseViewer.autoPostBack](https://www.graphicsmill.com/docs/gm5/P_J_GraphicsMill_BaseViewer_autoPostBack.htm.md) is **true**, [BaseViewer.zoomed](https://www.graphicsmill.com/docs/gm5/E_J_GraphicsMill_BaseViewer_zoomed.htm.md) event fires regardless of the value of this property.
 
This property corresponds to [ViewerClientSideOptions.PostBackOnZoomed](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_AjaxControls_ViewerClientSideOptions_PostBackOnZoomed.htm.md) server-side member.
   
## See Also

### Reference

- [ViewerClientSideOptions Class](https://www.graphicsmill.com/docs/gm5/T_J_GraphicsMill_ViewerClientSideOptions.htm.md)
- [GraphicsMill Namespace](https://www.graphicsmill.com/docs/gm5/N_J_GraphicsMill.htm.md)