How can you read a file line by line in JavaScript?

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I'm writing a web-app for the iPad that will be loading data from a text file. (A sample data set is around ~400 kb). I have everything set up except the file reading. The way I have set up my code, you pass an object which reads a file line by line.

How can I read a file line by line?

If there is no direct way to read a file line by line, can someone please show me an example of how to read a file into a string object? (so that I can use the split method :P)

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