source maps - How do I debug client errors in JavaScript? -

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i have window.onerror handler sends javascript errors our server. hoping analyse these using source maps link errors in minified source original code, seems chrome , firefox provide line numbers on error. far can see, source maps not useful without column number.

so, given line number of minified source , error message of form x undefined, steps can take debug?

(if makes difference, i'm using asset pipeline in rails 3.2).

chrome (and ie10) give column number fourth argument in window.onerror callback. here's firefox bug adding column numbers, doesn't promising.


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