When readAsText() function is completed the result is stored in .result
How do I see if the content of the file read are correct in .
readAsText is asynchronous, so you would need to use the onload callback to see the result.
Try something like this,
var fr = new FileReader();
fr.onload = function(e) {
// e.target.result should contain the text
};
fr.readAsText(file);
Further information here,
https://developer.mozilla.org/en-US/docs/DOM/FileReader