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I want to add a variable and add something to a functions content.

var variable1;

function myFunction() {
    alert(variable1);
    return variable1;
}

I want to change that to:

var variable1;
var variable2;
function myFunction() {
    alert(variable1);
    alert(variable2);
    return variable1;
}

I want that the changes are applied to a my main html file so that the next time the page is called the changes are in effect.

I already have a Servlet that can produce a new html page but I don't know how to change the JavaScript part of an already existing page.

Edit: so basically I need something like:

 request.getFunction(myFunction).addBeforeReturn(alert(variable2));
Improve this question
7
  • Is the javascript embedded in the html your are producing? Commented Mar 9, 2015 at 12:19
  • 1
    This might help http://stackoverflow.com/a/2413453/2850474 Commented Mar 9, 2015 at 12:22
  • 1
    If you already have the servlet producing HTML content what prevents you from adding few more lines to that code? Commented Mar 9, 2015 at 12:25
  • thx for the answers I edited my question abit to make my point clear. @yellen : yes but I could change that if that is a major problem (quite new to javascript and html) Commented Mar 9, 2015 at 12:44
  • @amarnath thx that tells me how to add a variable, so now I need a way to edit functions Commented Mar 9, 2015 at 12:44
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