How to read a text file in javascript..?

did you try this
http://www.daniweb.com/web-development/javascript-dhtml-ajax/threads/363266/javascript-read-a-text-file[^]

If you want to read a file stored at server side, use Ajax to read it.

xmlHttp.open("GET","file.txt",true);

If you want to read a file stored in local computer, there isn't a direct way to do this. But if your local computer is a Windows computer, you can use the FileSystemObject. Take a look at here[^].

function readSingleFile(evt) {
    //Retrieve the first (and only!) File from the FileList object
    var f = evt.target.files[0]; 
  if(f){
    var r = new FileReader();
      r.onload = function(e) { 
	   var contents = e.target.result;
       }
    }
}

my solution to this was to put data into a .JS file as a variable (using backend s/w - like VBA/Excel).
And also in other longstanding instances, use existing .HTM files (4 in succession).

Then process the variable (or .innerHTM's) and re-load the results into the IFRAME via .innerHTM

this works over the internet on all browsers I can test with (including Android OS) for files on the same domain. However there are issues for a system using local files (to the PC) with Chrome, & presumably Chrome based browsers like Opera. FireFox and IE seem to handle locally.

In a more recent project which was to reside on an Android phone, it was found that writing back to the IFRAME didn't work, and the reason was never determined. The post processing of the data was written to a