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I'm using the following in my .vimrc to highlight lines that over 80 characters long:

highlight OverLength ctermbg=red ctermfg=white guibg=#592929
match OverLength /\%81v.\+/

This affects all of my files. Is there a way I can set this to only affect a certain filetype, such as a Javascript file?

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up vote 0 down vote accepted

You can save those lines to a file named ~/.vim/after/ftplugin/javascript.vim on Unix or ~\vimfiles\after\ftplugin\javascript.vim on Windows.

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Use au Filetype ... source ... to source a file containing the commands for the appropriate file types.

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