ASP.NET下拉式onchange调用函数以及在函数内获取下拉式选定值的函数

Question

1.aspx页面

A.) asp:dropdown ...onchange="javascriptfunctionname">

B.) <script>
Javascriptfunctionname
{
  Getting dropdown selected values
}
</script>


C.) Problem Here:
How to pass drop down selected values in any c# method


D.) C# code
Public methodname
{
     // NEED TO COMBO VALUES HERE ON CALLING ONCHANGE FUNCTION
}

请帮助指导。这非常重要，需要紧急完成。谢谢

Answer 1

您可以在控件上使用回发，并且每次onchange命中时，它将回发到服务器，并且您可以在服务器端获得价值。

html

<asp:dropdownlist runat="server" autopostback="true" onselectedindexchanged="ddlTest_SelectedIndexChanged" id="ddlTest">  </asp:dropdownlist>

后面的代码

protected void ddlTest_SelectedIndexChanged(object sender, EventArgs e)
    {
        string selectedText = ddlTest.SelectedItem.Text;
        string selectedValue = ddlTest.SelectedItem.Value;

        //--- Show results in page.
        Response.Write("Selected Text is " + selectedText + " and selected value is :" + selectedValue);
    }