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backup input data with button, check upload-file size before send

rincewind , October 09 2016
Hi, i have 2 questions,
first: Is it possible to insert a button in the form to export the data which is already written there? something like an exel-export or similar. People should be able to save their input before submitting it.
second: can i check the file uploadsize before submitting? after choosing a file for upload it should instantly checked if too big.