How to read a text file using JS code?

Question

I am trying to read a file while using google charts. It first read he data from a text file and then create chart using that data. I wrote this code in JS for this purpose

function readTextFile(file){
    var rawFile = new XMLHttpRequest();
    rawFile.open("GET", file, false); // using synchronous call
    var allText;
    alert("Starting to read text");
    rawFile.onreadystatechange = function ()
    {   
        alert("I am here");
        if(rawFile.readyState === 4)
        {
            if(rawFile.status === 200 || rawFile.status == 0)
            {
                allText = rawFile.responseText;
            }
        }
    }
    rawFile.send(null);
    alert(allText);
    return allText;
}

The problem is : this method is getting called, but the control is not going in

rawFile.onreadystatechange = function ()
    {    ... }

Do anyone have any idea regarding this? Thanks in advance!

note: I am sending the file name in the parameter (file). I am not passing the address as both this HTML file and the text file are in the same folder.

update 1: I printed rawFile.readyState , and it always shows 1 which means server connection established. My code is a simple HTML code, not using any server for this purpose.

update 2: I tried adding file:/// before the file name that is not working too :(

Looks like a variation of the classic async question stackoverflow.com/questions/14220321/… — elclanrs
– elclanrs, Commented Jul 23, 2015 at 7:30
Yes, it looks like, but I used rawFile.open("GET", file, false); "false" meaning it is synchronous. — Srijani Ghosh
– Srijani Ghosh, Commented Jul 23, 2015 at 8:00

Srijani Ghosh · Accepted Answer · 2015-07-23 08:34:58Z

1

I made the call asynchronous.

 rawFile.open("GET", file, true);

Now it is working

answered Jul 23, 2015 at 8:34

Srijani Ghosh

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