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"));
}