When using the URL feature of the spreadsheet it seems to use "_blank" as the target (opens in a new window).

My spreadsheet is in a single page application with some javascript already loaded.

I'd like to have the url be something like "javascript:myfunction('test');" which works well even with an a tag "<a href='javascript...'>"

I do this quite a lot with templates on the Grid control.

Not asking for templates on the spreadsheet, just let us specify the target and/or use local javascript functions in an "a href";