# SignatureBeforeSubmitCallback Function

> Invoked immediately before a signature document is submitted.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Function
- **Path:** DS Server > Reference > JavaScript API - Document Viewer > SignatureBeforeSubmitCallback Function
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebeforesubmitcallback/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebeforesubmitcallback/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebeforesubmitcallback/llms-full.txt

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## On This Page

- [Description](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebeforesubmitcallback/#description)
- [Syntax](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebeforesubmitcallback/#syntax)

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## Nearby

- **Previous:** [Javascript: PDFJSSettings.workerSourcePath Property](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/pdfjssettings/workersourcepath-property/llms.txt)
- **Next:** [SignatureBox Object](https://docs.textcontrol.com/ds-server/reference/javascript-document-viewer/signaturebox/llms.txt)