How to resolve the C:\fakepath?

<input type="file" id="file-id" name="file_name" onchange="theimage();">

This is my upload button.

<input type="text" name="file_path" id="file-path">

This is the text field where I have to show the full path of the file.

function theimage(){
 var filename = document.getElementById('file-id').value;
 document.getElementById('file-path').value = filename;
 alert(filename);
}

This is the JavaScript which solve my problem. But in the alert value gives me

C:\fakepath\test.csv 

and Mozilla gives me:

test.csv

But I want the local fully qualified file path. How to resolve this issue?

If this is due to browser security issue then what should be the alternate way to do this?