# 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
- **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

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## On This Page

- [Description](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/#description)
- [Syntax](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/#syntax)
- [Examples](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/toolbarbutton/onclick-property/#examples)

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## Nearby

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