Get Dropdown Selected Value using JavaScript

We will see how to Get Dropdown selected Value using javascript..?

 

First create javascript function as GetMaster1Details:

function GetMaster1Details()
{
   var value = document.getElementById("<%=ddlMaster1.ClientID%>");
   var getvalue = value.options[value.selectedIndex].value;
   var gettext = value.options[value.selectedIndex].text;
   alert("value:-" +" "+ getvalue + " "+ "Text:-" +" "+ gettext);
}

Then use this function to dropdown on onchange event as:

<asp:DropDownList ID="ddlMaster1" runat="server" onchange="GetMaster1Details()">
</asp:DropDownList>

And See output is: