How to get all the not selected value of multiple list box

Hi experts,
How to get all the not selected values of multiple list box.  For selected : elSel.options[k].selected

So, what the javascript for not selected values.
sitijaafarAsked:
Who is Participating?
 
Gurvinder Pal SinghCommented:
using javsacript, you can get all the values in select box which are unselected in a hidden field.
Then you can send those values (comma separated) to servlet after submitting them

try this code
<html>
<head>
<script type="text/javascript">
function unselectedOptions()
{
  var options = document.getElementById("mySelect").options;   
  var unSelectedVals = new Array();
  for ( var counter =0; counter < options.length; counter++ )
  {
     if ( !options[ counter ].checked )
     {
         unSelectedVals[ unSelectedVals.length ] = options[ counter ].value;
     }
  }
  alert(unSelectedVals.join(","));
}
</script>
</head>
<body>

<form>
<select id="mySelect" size="4" multiple>
	<option>Apple</option>
	<option>Pear</option>
	<option>Banana</option>
	<option>Orange</option>
</select>
<a href="javascript:unselectedOptions()">Show all Unselected options</a>
</form>
</body>
</html>

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Dushyant SharmaCommented:
elSel.options[k].selected itself returns boolean.
so checking it for false will return all the not selected values.

you can check as
if (elSel.options[k].selected==false)
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sitijaafarAuthor Commented:
I try your code, it display all the values even the selected one.
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sitijaafarAuthor Commented:
so, here my code.
function removeCountrySelected()
{
  var elSel = document.getElementById("learnCountry1");
  var i; 
  var alrmsg;
  var country;
  var countries;
  i
  for (i = elSel.length - 1; i>=0; i--) {
    if (elSel.options[i].selected) {	  
      elSel.remove(i);
    }	
	
	 if (elSel.options[i].selected==false) {	  
        country=elSel.options[i].value;
		countries+=country;
    }	
	document.frm.learnCountry.value=countries;

  
}

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Dushyant SharmaCommented:
try this
<script type="text/javascript">

var myselect=document.getElementById("sample")
for (var i=0; i<myselect.options.length; i++){
 if (myselect.options[i].selected==false){

  alert(i + "is not selected");
 }
}
</script>
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Gurvinder Pal SinghCommented:
Sorry, i need to use the 'selected' method, not the 'checked'

replace that method with
function unselectedOptions()
{
  var options = document.getElementById("mySelect").options;  
  var unSelectedVals = new Array();
  for ( var counter =0; counter < options.length; counter++ )
  {
     if ( !options[ counter ].selected )
     {
         unSelectedVals[ unSelectedVals.length ] = options[ counter ].value;
     }
  }
  alert(unSelectedVals.join(","));
}
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sitijaafarAuthor Commented:
yes, it work, I try to apply to my code.
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sitijaafarAuthor Commented:
I apply the code but not succeed.  
function removeCountrySelected()
{
  var elSel = document.getElementById("learnCountry1");
  var i; 
  var alrmsg;
  var country;
  var countries;
  var unSelectedVals = new Array();
  for (i = elSel.length - 1; i>=0; i--) {
    if (elSel.options[i].selected) {	  
      elSel.remove(i);
    }	
	
	if ( !elSel.options[i].selected )
     {
         unSelectedVals[ unSelectedVals.length ] = elSel.options[i].value;
     }	
	
  
}
document.frm.learnCountry.value=unSelectedVals.join(",");


}

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Michel PlungjanIT ExpertCommented:
This should work

function removeCountrySelected() {
  var elSel = document.getElementById("learnCountry1");
  var unSelectedVals = [];
  for (var i = elSel.length - 1; i>=0; i--) {
    if (elSel.options[i].selected) elSel.options[i].remove();
    else unSelectedVals[unSelectedVals.length] = elSel.options[i].value;
  }
  document.frm.learnCountry.value=(unSelectedVals.length >0)unSelectedVals.join(","):"";
}

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Gurvinder Pal SinghCommented:
@sitijaafar: line 14-17 was not required, since once you have removed it from select box, it wont be accessible again,

Also remove line 21 now, since learnCountry select box now has only unselected value

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