如何设置选择的默认选项？

Question

In my code I'm using two dropdownlistbox. From the first DDL I have multiple array of values. If I select any one of the value and then click the button, the selected value is removed from the first DDL and added into the second DLL. All these processes are running properly.

But, how do I set the default selected option into the second DDL? This is my script:

function SelectMoveRows(SS1,SS2)
{
    var SelID='';
    var SelText='';
    var count=0;
    // Move rows from SS1 to SS2 from bottom to top
    for (i=SS1.options.length - 1; i>=0; i--)
    {
        if (SS1.options[i].selected == true)
        {
            SelID=SS1.options[i].value;
            SelText=SS1.options[i].text;
            var newRow = new Option(SelText,SelID);           
            SS2.options[SS2.length]=newRow;            
            SS1.options[i]=null;
            //count++;//by raghu
        }
    }
}

Answer 1

Seeing as the arguments for new Option are

new Option(text, value, defaultSelected, selected);

Did you try

var newRow = new Option(SelText,SelID, true, true);

Another option would be to set the selects value to the same as SelID after the option is inserted.

SS2.value = SelID;