Is it possible to add custom event handler to the submit button of Edit Form through CSR/JSLink?
If yes, any documentation/links or example that I could use to achieve this with pure CSR?
Well, you can't exactly use CSR itself to do that, because you can't hook into the rendering of the button.
What you need to do is create a custom
PreSaveAction function which will be called by SharePoint when the submit button is clicked.
You could potentially use something like
OnPostRender in the CSR framework to define the function or something, but that seems unnecessary.
You definitely can use the JSLink property of the edit form web part to pull in a custom script file in which you define your
Check below references which might help you: