Question

I want to calculate in Javascript but having Strange Problems.
It just adds an 1 to my String but it should calculate it. I am converting my Strings to Int with the parseInt() Function and a am calculating like this: sec = sec + 1;

 var calc= parseInt($(this).find("input[name=calc]").val());
                calc = calc + 1;

Answer 1

Your string must not be empty if don’t want NaN. First check if you get an empty string:

var cal = null;

if ( $(this).find("input[name=calc]").val() ) {

    cal = parseInt( $(this).find("input[name=calc]").val(), 10 );
    cal++;

}