Forget file manipulation using AngulaJS. Angular is a JS front-end infrastructure without file management support. You need to have access to the server where the file is stored, and you will only get it on the server side.
EDIT:
Ok, I found out that you can use the FileReader API or $ parse Angular to read the contents of the file on the interface, which is really cool.
Option A: Read this fooobar.com/questions/277710 / ... and follow plnkr to see an example of the FileReader API used with Angular. Claims to @MajoB for excellent answers and code examples.
Option B: Check out the official Angular documentation to familiarize yourself with the $parse service and check this fiddle to see it in action.
Unfortunately, neither the FileReader API nor the $ parse service can read Excel files. They can read .txt , .csv , .json and even .html , but not .xlsx
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