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A dual ListBox implemented with JavaScript

Source: Internet
Author: User
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JavaScript This is an example of an application of the "Dual ListBox" (a two-way selector) I made out of JavaScript, which I've dug out of my code. Often used in web programming.

Perhaps my implementation is too cumbersome, I hope you have better code to contribute out.

<title> selector </title>
<link href= "./style/style.css" rel= "stylesheet" type= "Text/css" >
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<meta http-equiv= "Page-enter" content= "Blendtrans (duration=1.0)" >
<meta http-equiv= "Page-exit" content= "Blendtrans (duration=1.0)" >
<script language= "JavaScript" >
function Openwin (URL, L, T, W, h)
{Open (URL, ', ' toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width= ' + w + ', height= ' + H + ', Left= ' + L + ', top= ' + t);}

function Check_and_submit (frm)
{
SelectAll (frm. SelectedItem);
Frm.submit ();
}
</script>

<body>

<form name= "Frm1" id= "Frm1" method= "post" action= "save.asp" >
<input name= "Allowsubmit" type= "hidden" value= "OK" >

<table width= "border=" 0 "cellspacing=" 0 "cellpadding=" 0 "align=" center ">
<TR HEIGHT=10><TD colspan=3></td></tr>
<tr>
<TD width= "Align=center" valign= "Top" >
Columns assigned to this user management:<br><br>

<select name= "SelectedItem" id= "SelectedItem" size=12 multiple= "true" >
<option> No </option>

</select>
</select>
</td>
&LT;TD width= "Align=center>"
<br><br>
<button ><</button><br><br>
<button ><<</button><br><br><br><br>
<button >></button><br><br>
<button >>></button><br>
</td>
&LT;TD width= "Align=center" valign= "Top" >
Columns to be allocated:<br><br>
<select name= "Waitselectitem" size=12 multiple=true>
<option> Normal News </option>
<option> Video News </option>
<option> Photo News </option>
<option> Special News </option>
<option> 100,000 Why </option>
<option> Code Testing </option>
<option>www.why100000.com</option>
</select>
</td>
</tr>
</table>
</form>

<script language= "JavaScript" >
function Movesingleitem (Sel_source, Sel_dest)
{
if (sel_source.selectedindex==-1) file://source : No items selected
Return

if (sel_source.options[0].text== "none") file://source : Only "None" item
Return


if (sel_dest.options[0].text== "none") file:// : Only "None" item, delete the suggestive item first
Sel_dest.options.remove (0);


var selectedtext = Sel_source.options[sel_source.selectedindex].text;
Sel_dest.options.add (New Option (SelectedText));
Sel_source.options.remove (Sel_source.selectedindex);

if (sel_source.options.length==0) file://source : If all useful items have been deleted, add the hint item: "None"
Sel_source.options.add (New Option ("none"));
}

function Moveallitems (Sel_source, Sel_dest)
{
if (sel_source.options[0].text== "none") file://source : Only "None" item
Return

if (sel_dest.options[0].text== "none") file:// : Only "None" item, delete the suggestive item first
Sel_dest.options.remove (0);

file:// First Copy all items to the target:
var sel_source_len = sel_source.length;
for (var j=0; j<sel_source_len; J + +)
{
var selectedtext = Sel_source.options[j].text;
Sel_dest.options.add (New Option (SelectedText));
}


file://then delete all items from "source":
while ((k=sel_source.length-1) >=0)
{
if (sel_source.options[0].text== "none") file://source : Only "None" item
Break
Sel_source.options.remove (k);
if (sel_source.options.length==0) file://source : If all useful items have been deleted, add the hint item: "None"
Sel_source.options.add (New Option ("none"));
}
}

function SelectAll (thesel) file:// All items in selected select
{for (i = 0; i<thesel.length;i++)
Thesel.options[i].selected = true;
}
</script>



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