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This can be done quite easily using javascript XMLHttpRequest() class:

function FileHelper()
{}
{
 FileHelper.readStringFromFileAtPath = function(pathOfFileToReadFrom)
 {
 var request = new XMLHttpRequest();
 request.open("GET", pathOfFileToReadFrom, false);
 request.send(null);
 var returnValue = request.responseText;
 return returnValue;
 }
}
...
var text = FileHelper.readStringFromFileAtPath ( "mytext.txt" );

This can be done quite easily using javascript XMLHttpRequest() class (AJAX):

function FileHelper()
{
 FileHelper.readStringFromFileAtPath = function(pathOfFileToReadFrom)
 {
 var request = new XMLHttpRequest();
 request.open("GET", pathOfFileToReadFrom, false);
 request.send(null);
 var returnValue = request.responseText;
 return returnValue;
 }
}
...
var text = FileHelper.readStringFromFileAtPath ( "mytext.txt" );