What to use instead of FileReader for Safari?

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Sadly, the only answer I can come up with will hog some extra bandwidth.

Firstly, use something like if (typeof FileReader !== "undefined" or Modernizr to follow your normal flow for the browsers that DO support FileReader. Otherwise, POST the file via AJAX to some server-side script that echoes back the contents.

So for compliant browsers, you get to save yourself some bandwidth and for non-compliant browsers you have to take one for the team.

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