ส่งค่าจาก pop up มา form หลัก ++ เราให้ผู้ใช้เลือกหมวดหมู่สินค้า แล้วทำการเก็บค่าที่เลือก

<script language="javascript">
function selValue()
{
	var val = '';
	for(i=1;i<=frmPopup.hdnLine.value;i++)
	{
		if(eval("frmPopup.Chk"+i+".checked")==true)
		{
			val = val + eval("frmPopup.Chk"+i+".value") + ',';
		}
	}
	window.opener.document.getElementById("txtSel").value = val;
	window.close();
}
</script>

<script language = "JavaScript">

<select name="select1" size="5" id="select1">
  <option value="value1">value1</option>
  <option value="value2">value2</option>
  <option value="value3">value3</option>
  <option value="value4">value4</option>
  <option value="value5">value5</option>
</select> 
<select name="select2" size="5" id="select2">
  <option value="value1">value1</option>
  <option value="value2">value2</option>
  <option value="value3">value3</option>
  <option value="value4">value4</option>
  <option value="value5">value5</option>
</select> 

<select name="select3" size="5" id="select3">
  <option value="value1">value1</option>
  <option value="value2">value2</option>
  <option value="value3">value3</option>
  <option value="value4">value4</option>
  <option value="value5">value5</option>
</select> 

<input type="button" name="setvalue" value="SetValue"  onclick="setValue()"/>
<script language="javascript">
function setValue()
{
var text1 = document.getElementById('select1').value;
var text2 = document.getElementById('select2').value;
var text3 = document.getElementById('select3').value;
//alert(text1+text2+text3);
text_from_popup = text1+">"+text2+">"+text3; // create new text from three selected option
textbox_mainpage = window.opener.document.getElementById("txtbox"); // create new var  from main page textbox object prepare for set value
textbox_mainpage.value = text_from_popup; // set value from popup to main page textbox
window.close(); // close this popup
}
</script>