Question

the question was accepting one or many ports that has one space between them

with help of friends
here, I used this one for my answer
but for example if I enter 88888 it will alert me such this thing:

88888NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN is not correct

how can I correct this

<script type="text/javascript">
    function portvalidating(field)
    {
    var output='';
        m=field.value;
        if(/^\d{1,5}([ ]\d{1,5})*$/.test(m))
        {
        var parts = m.split(' ');
        for(i in parts)
        {
          var p= parseInt(parts[i]);
        if(!((0 <= p) && (p<= 65535) && !isNaN(p)))
        {
        output+=p;
        }
        }
    if(output=='')
        var dummy=1;
        else alert(output+'is not correct');
        }
        else alert('please enter a valid port!');
        }

Answer 1

Try separating your concerns of reading/writing to form data from input validation from alerting. Here is a hint on the function to validate a string of space separated integers in [0..65535]:

var getPorts = function(str) {
  var ns=(""+str).split(/\s+/), ports=[], n, i;
  for (i=0; i<ns.length; i++) {
    n = parseInt(ns[i], 10);
    if (isFinite(n) && !isNaN(n)
          && (ns[i]==n) // Make sure the number is an integer.
          && (n >= 0) && (n <= 65535)) {
      ports.push(n);
    }
  }
  return ports;
};

getPorts('-1 0 NaN 123 foo 255 99999'); // => [0, 123, 255]