javascript - input file - read contents before submit -


i'm trying find out if there clean, cross browser way peek @ contents of file waiting uploaded through html input element.

the intention able select csv file clientside read first few lines can format , allow user select columns should mapped predetermined expected value.

if web app expecting data file , wants firstname, surname, email , role; data can ben in order allow csv file change without updating upload code.

i've found activex solutions hoping find either wraps functionality cross browser or more modern solution


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