Question

I’m trying to pass data into my function and if there’s no data being pass it will just use the default value instead.

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<a id="process" onclick='process(,"testing","test value")' href="#">Process</a>

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function process(passvar1,passvar2,passvar3) {


  var defvar1 = 'default value 1', 
      defvar2 = 'default value 2', 
      defvar3 = 'default value 3';



  if (typeof(passvar1)=="undefined") {
      passvar1 = defvar1;
      return passvar1;
  }


 if (typeof(passvar2)=="undefined") {
      passvar2 = defvar2;
      return passvar2;
  }


  if (typeof(passvar1)=="undefined") {
      passvar1 = defvar1;
      return passvar3;
  }


  alert ('retuern values here ' + passvar1 + ' ' + passvar2 + ' ' + passvar3);

Code play : http://jsbin.com/oledeg/

Answer 1

Looking at your comment, you can simply the function like this:

function process(passvar1, passvar2, passvar3) {
   passvar1 = passvar1 || 'default value 1';
   passvar2 = passvar2 || 'default value 2';
   passvar3 = passvar3 || 'default value 3';

   return 'retuern values here ' + passvar1 + ' ' + passvar2 + ' ' + passvar3;
}

alert(process("testing","test value", "third value"));
// retuern values here testing test value third value

In your function, since you return in each if condition, only first condition is executed and function is returned with just one variable.