How to add form values into a single line...

Question

How can we add numerous form values (say surname, first name and middle initial) into a single line? thanks in advance^^  

Answer 1

You can use the "+" operator which is both the addition (number) and concatenation (string) operator. JavaScript makes the decision about how this operator will work by the type of the value of being processed. Two numbers JavaScript performs addition, character string and number, number and character string, or 2 character strings then concatenation.
If you just use the '+' operator and spaces, you will get extra spaces unless you add code to allow for null fields and adjusting the spacing or other punctuation as needed. You may also need to force numeric values to character stings or you might end up with an addition and not concatenation.
Adobe provided a example of a funciton to properly join 3 fields with full versions of Acrobat:
function fillin(s1, s2, s3, sep) {
  // Concatenate 3 strings with separators where needed
  // convert passed strings to a string value
  s1 = s1.toString();
  s2 = s2.toString();
  s3 = s3.toString();
  // assign a numeric value for presence of a given string(s)
  var test = 0; // no passed strings
  if (s1 != "") test += 1; // s1 has a value
  if (s2 != "") test += 2; // s2 has a value
  if (s3 != "") test += 4; // s3 has a value
  // return appropriate combination based on passed strings
  if (test == 0) return ""; // no stings passed
  if (test == 1) return s1; // s1 only
  if (test == 2) return s2; // s2 only
  if (test == 3) return s1 + sep + s2; // s1 and s2
  if (test == 4) return s3; // s3 only
  if (test == 5) return s1 + sep + s3; // s1 and s3
  if (test == 6) return s2 + sep + s3; // s2 and s3
  if (test == 7) return s1 + sep + s2 + sep + s3; // s1, s2, and s3