How to import an excel file into a Webapp (javascript/d3/html)
<p>I am still quite new to data visualization but learning quickly.
I am trying to create a small webapp in which the user can provide an excel spreadsheet and then the webapp would create a data visualization of this spreadsheet. 
I have the datavisualization part working with a dataset that is just preprogrammede as a variable (array). But I would like to ask help in creating the option for the user to "upload" their own excel file and then put the data from the spreadsheet into an array variable and run the d3 datavisualization on that.</p>