# Javascript: ToolbarButton.onclick Property

> Click callback, or `null` when no action is assigned.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Property
- **Path:** DS Server > Reference > JavaScript API - Document Viewer > Javascript: ToolbarButton.onclick Property
- **216 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/llms-full.txt

---

### Description

Click callback, or `null` when no action is assigned.

### Syntax

```javascript
<function> ToolbarButton.onclick
```

### Examples

The following example demonstrates `toolbarbutton.onclick` in a practical Document Viewer workflow. Sets an onclick event-handler method for handling click-actions on the button.

```javascript
function configureApproveButton(toolbarButton) {
    toolbarButton.onclick = function() { console.log("Document approved."); };
    console.log("Approve button onclick:", toolbarButton.onclick);
}
```

---

## Nearby

- **Previous:** [Javascript: ToolbarButton.name Property](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/name-property/llms-full.txt)
- **Next:** [Javascript: ToolbarButton.show Method](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/show-method/llms-full.txt)