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我有一个下拉列表。用户选择不同的值后，我应该从下拉列表中获取用户选择的选项文本，然后从数据库中查找数据并在网页上显示相关内容。如果用户再次更改选项，我应该根据选择的选项文本检索不同的数据并在网页上显示不同的内容。

我怎么能做到这一点？任何人有任何想法让我开始吗？我在网上搜索但找不到任何有用的东西。

这是我的代码：

ASPX 文件：

<asp:Dropdownlist ID="SelectionDropDownList" 
                  runat="server" Width="136px" 
                  EnableViewState="True" 
                  AppendDataBoundItems="true">
</asp:Dropdownlist>

CS文件：

//how the dropdown list is being populated out. Dropdown list is being populated out from what the user has selected from a listbox.
public void BindSomething()
{
    DateTime choosenDate = DateTime.MinValue;
    using (SqlConnection conn = new SqlConnection(dbConn))
    {
        using (SqlCommand cmd = new SqlCommand(spretrieve, conn))
        {
            //Lost to hold the values
            List<DateTime> listCopy = new List<DateTime>();
            DateTime dt;
            string values = String.Join(", ", ListBox1.Items.Cast<ListItem>().Where(i => i.Selected).Select(i => i.Text));
            if (values.Contains("Select All"))
            {
                //Loop through each items in listbox and then add it to list
                foreach (ListItem li in ListBox1.Items)
                {
                    if (DateTime.TryParse(li.Text, out dt))
                    {
                        listCopy.Add(dt);
                    }
                }
            }
            else
            {
                //Loop through each items in listbox and then add it to list
                foreach (ListItem li in ListBox1.Items)
                {
                    //check if item is selected
                    if (li.Selected == true)
                    {
                        //add items to list
                        listCopy.Add(DateTime.Parse(li.Text));
                    }
                }
            }

            //compare and sort so that the latest date comes on top
            listCopy.Sort((x, y) => y.CompareTo(x));
            //clear the items in dropdownlist
            SelectionDropDownList.Items.Clear();
            //set the datasource to dropdownlist
            SelectionDropDownList.DataSource = listCopy;
            //set the dateformatstring in dropdownlist
            SelectionDropDownList.DataTextFormatString = "{0:dd-MMM-yyyy}";
            //Bind the dropdownlist
            SelectionDropDownList.DataBind();
        }

感谢是否有人可以帮助我，非常感谢！

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1 回答 1

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您可以尝试使用 jQuery

$(document).ready(function() {
$('#SelectionDropDownList').change(function(){
  //here you can add code for whatever you want to show   
});
});

我希望这能帮到您。

于 2015-09-29T07:32:48.133 回答