Safer parse float function that handles commas in input and bails outright if there is text in the input

parseFloatSafe.js

      parseFloatSafe: function(v) {
        // A more sane parseFloat function
        // - Verifies number in a sensible format and returns NaN otherwise.  Sensible format = (#,000.##..) or (#.##) or (#,000) or (#)
        // - supports scientific notation (E[-+]?###)
        // - null / empty string return null
        // - non-string types are converted to string and parsed that way
        if (v === null) {return null;}
        var tmp = ('' + v).trim();
        if (tmp === '') {return null;} 
        if (tmp.match('^[-+]{0,1}[0-9]+([,]{0,1}[0-9]{3}){0,4}([.][0-9]+){0,1}([eE][-+]{0,1}[0-9]+){0,1}$')) {
         return parseFloat(tmp.replace(/,/g, '')); 
        } else {
          return NaN;
        }
      },