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"Dual ListBox" implemented with Javascript (bi-directional selector)

Source: Internet
Author: User
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Javascript

This is an application example of the "Dual ListBox" (a two-way selector) I made out of Javascript, and it was extracted from 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)//Source: No Items selected
Return

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

if (sel_dest.options[0].text== "none")//target: Only "None" item, delete the prompt 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)//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")//Source: Only "None" item
Return

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

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));
}

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

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



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