下拉框的做法大全

 

把选择的文本对应的编号存入数据库中

 car.车辆载重 = ddl_carCarry.SelectedValue;

 

下拉框禁用

ddl_carName.Enabled = false;

 

js验证是否选中：

 var filiale = document.getElementById("ddl_carName").value; 

if (filiale.options[filiale.selectedIndex].value == "-1") {
           alert("请选择车队名称！");
               filiale.focus();
                  return false;
          }

 

 

后台查看用户是否选择了下拉的值

   if (ddl_carName.SelectedValue == "-1")
        {
            ScriptManager.RegisterStartupScript(this, GetType(), "89", "alert('请选择车队名称！');", true);
            ddl_carName.Focus();
            return;
        }

 

 

 

 

    /// <summary>
    /// 绑定车队名称
    /// </summary>
    private void Bind_drop()
    {
        ObjModelDataSource<CAR_企业车队> enterprise = new ObjModelDataSource<CAR_企业车队>(CAR_企业车队.COL_企业ID + "= '" + ((LoginUser)Session["LoginUser"]).企业ID + "'");
        ddl_carName.DataValueField = CAR_企业车队.COL_ID;
        ddl_carName.DataTextField = CAR_企业车队.COL_车队名称;
        ddl_carName.DataSource = enterprise;
        ddl_carName.DataBind();
        ddl_carName.Items.Insert(0, new ListItem("请选择车队名称", "-1"));
    }