Asp.net下拉onchange調用函數和函數獲取下拉選擇值

Question

1.aspx頁面

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
}

請幫忙指導。非常重要，是緊急完成。謝謝

Answer 1

您可以在控件上使用回發，並且每次onchange命中時，它都會回發到服務器，您可能會在服務器端獲得您的價值。

HTML

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

代碼背后

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);
    }