/*
 * Control two SelectList
 * @author Donny.tang
 * @create on 2007-2
 */

/**
 * add one option of a select to another select.
 */
function addItem(ItemList,Target)
{
    for(var x = 0; x < ItemList.length; x++)
    {
        var opt = ItemList.options[x];
        if (opt.selected)
        {
            flag = true;
            for (var y=0;y<Target.length;y++)
            {
                var myopt = Target.options[y];
                if (myopt.value == opt.value)
                {
                    flag = false;
                }
            }
            if(flag)
            {
                Target.options[Target.options.length] = new Option(opt.text, opt.value, 0, 0);
            }
        }
    }
}

/**
 * move one selected option from a select.
 */
function delItem(ItemList)
{
    for(var x=ItemList.length-1;x>=0;x--)
    {
        var opt = ItemList.options[x];
        if (opt.selected)
        {
            ItemList.options[x] = null;
        }
    }
}

/**
 * move one selected option up from a select.
 */
function upItem(ItemList)
{
    for(var x=1;x<ItemList.length;x++)
    {
        var opt = ItemList.options[x];
        if(opt.selected)
        {
            tmpUpValue = ItemList.options[x-1].value;
            tmpUpText  = ItemList.options[x-1].text;
            ItemList.options[x-1].value = opt.value;
            ItemList.options[x-1].text  = opt.text;
            ItemList.options[x].value = tmpUpValue;
            ItemList.options[x].text  = tmpUpText;
            ItemList.options[x-1].selected = true;
            ItemList.options[x].selected = false;
            break;
        }
    }
}

/**
 * move one selected option down from a select.
 */
function downItem(ItemList)
{
    for(var x=0;x<ItemList.length;x++)
    {
        var opt = ItemList.options[x];
        if(opt.selected)
        {
            tmpUpValue = ItemList.options[x+1].value;
            tmpUpText  = ItemList.options[x+1].text;
            ItemList.options[x+1].value = opt.value;
            ItemList.options[x+1].text  = opt.text;
            ItemList.options[x].value = tmpUpValue;
            ItemList.options[x].text  = tmpUpText;
            ItemList.options[x+1].selected = true;
            ItemList.options[x].selected = false;
            break;
        }
    }
}

/**
 * select all items of a select
 */
function selectItem(ItemList)
{
    for(var x=ItemList.length-1;x>=0;x--)
    {
        var opt = ItemList.options[x];
        opt.selected = true;
    }
}

/**
 * select one item of a select
 */
function selectOneItem(ItemList,ItemValue)
{
    for(I = 0;I < ItemList.options.length; I++)
    {
        if(ItemValue == ItemList.options[I].value)
        {
           ItemList.options[I].selected = true;
        }
    }
}
/**
 * join items of an select with ",".
 */
function joinItem(ItemList)
{
    var OptionList = new Array();
    for (var x=0; x<ItemList.length;x++)
    {
        OptionList[x] = ItemList.options[x].value;
    }
    return OptionList.join(",");
}