关于简单控件DropDownList的使用.

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1.加载时绑定

DataSet DS= new DataSet();
DS= TestBll.GetAllList();

//用于绑定dropdownList

dropdownList1.DataTextField = "Name";
dropdownList1.DataValueField = "ID";

dropdownList1.DataSource = DSRouting;
dropdownList1.DataBind();

2.在修改时需要绑定原始数据到dropdownList,并显示原有的选定数据.(用于后台)

     for (int i = 0; i < DS.Tables[0].Rows.Count; i++)
        {
            if (DS.Tables[0].Rows[i][0].ToString() == ds.Tables[0].Rows[0]["RoutingID"].ToString()) //ds为Edit选择的结果集
            {
                dropdownList1.SelectedIndex = i;
            }
        }

3.在修改时需要绑定原始数据到dropdownList,并显示原有的选定数据.(用于前台)

function StartModifyPassword(UseState)//UserState为Edit选择的值
{

            var province=document.getElementById("dropdownList1 "); //前台的dropdownList的Name
            var pindex = province.selectedIndex;
            var pValue = province.options[pindex].value;
            var pText = province.options[pindex].text;

            var itemCount = province.options.length;
            for (var i = 0; i < itemCount; i++)
            {
                if (province.options[i].text == UseState)
                {
                    province.selectedIndex = i;
                }
            }